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XDT User`s Manual - Lesman Instrument Company

1. 2 Short circuit on sensor cable or connections Disconnect cable from sensor and if meter still reads SIR cure the short circuit in the cable or connections or replace cable otherwise check the sensor 3 Short circuited sensor Disconnect cable from sensor and note that the meter reading returns to OPN Use a new sensor or apply approximately 20V DC to the sensor MOMENTARILY with the sensor in a known dry condition Polarity is not important but the contact MUST be very brief or the sensor may be damaged Consult with your representative for a cir cuit diagram Display Shows CPN 1 Instrument failure Short the SIG and SHIELD contacts of the sensor input terminal if the instrument reads SHR the problem is in the cable or sensor otherwise return the instrument for service 2 Open circuit on cable Disconnect cable from sensor and short center pin of plug to the outer shell If the dis play still shows OPN repair cable 3 Open circuit on sensor Check sensor connection or replace sensor For non sensor related problems e g no reading on instrument refer to section 3 6 Section 3 Instrument 3 Instrument 3 1 Precautions using the XDT The XDT uses state of the art microelectronics to provide a compact full functioning instrument The user should consider the following precautions when using any sensitive electronic device e Observe the appropriate electrical safety codes and
2. Cancel Calibration it is not performed Start few sec CALCULATING Calibration mit Confirm see Self Cal user interface next page SpanCheck again Confirm SpanCheck Viewing Serial number Press together to RESET the instrument Legend A slash in the display area is used to depict two alternately shown flashing back and forth messages e denotes beeping Buttons without designator or arrow leading out perform no function 37 XDT User s Manual Appendices Flow Diagram Operating State User Interface continued Manual amp Scheduled Self Calibration Flow diagram items not related to Self Calibration are shaded in gray Power ON initialization 30 seconds anywhere other than _r appears when changing and sign on message Calibration without key press HL settings of locked unit 4 Toggle Pressure Correction 1 2 sec 65 0 c TF DENFONT PSI Viewing Dewpoint og Flashing PSI indicates 238 pressure corrected 333 dewpoint SHORT PRESS Confirm Entry into Self Cal Menus eb D e cancel _ oO sr a D 42 0 cf Set Reference ao Gas dewpoint c AE wn P values 0 1 C timeout e 2 d oO 33 ser k e P E F o 120 H S Intr
3. National Institute of Standards and Technology National American Standard Pipe Taper an ASTM American Society for Testing and Materials standard of tube fittings with tapered threads a way of incorporating error checking into a RS232 data transmis sion on a character by character basis to check if the data has been received correctly LBS H O mmscf the mass of water vapor present in unit volume of moist air at standard temperature and pressure a measurement unit for moisture typically used in the natural gas industry parts per million usually based on volume measure but must be stated whether it is by volume or by mass weight parts per million based on volume measure volume of water vapor per total volume of gas for an ideal gas computation of dewpoint at a pressure different from the pressure at the sensor Programmable Read Only Memory a device that can be pro grammed so that data is permanently stored in it typically used for computer programs Random Access Memory a device that holds data as long as it has power applied to it the data can be changed with out limit small flow of dry air from drying column passing through regener ating column and desorbing water from desiccant at low pressure time it takes for a sensor to react to change in its environment 35 XDT User s Manual saturate oooooooo sintered suit haren slip stream SpanCheck a type of
4. XDT 70 M 0002 5 660 MOUNTING CLIP 2 REN D gt CONNECTOR 21 RR 2 87 2 21 E MOUNTING PANEL CUTOUT 5 273 lt CENTERLINE E 070 RADII TOP VIEW 31 Standard mounting AA with clip on compression brackets IE seat ho Environmentally sealed mounting or EO ROTD eran ON TA DETAIL VIEW 4X R 070 4 PLS OSE REF LP gt PANEL THICKNESSES 056 REF CTYP gt p UP TO 1 22 INCHES 31 0 MM MAY BE ACCOMMODATED XDT 70 M 0075 MOUNTING PANEL j XDT 30 M 2075 gt p WEATHERPROOF GASKET Pek eae Y SCREW CLAMP MOUNTING CLIP 4 REG D SIDE VIEW BACK VIEW D ge Up C 3 ea ny 3 L O DETAIL VIEW 4X A gt 43 XDT User s Manual Appendices Appendix E continued XDT NEMA Enclosure Mounting Dimensions 199 5 832 MOUNTING HOLE PATTERN 6 30 3 462 MOLINTING HOLE PATTERN L SENSOR OUTPUT 1 438 FOR ZENER BARRIER EQUIPPED UNITS 7 i ETE O oe ee NM Suomi HIGH VOLTAGE APPLICATION 1 3 558 2 CABLE GRIP LOW VOLTAGE APPLICATION O i pee E gt md t 1 lab ls L le 1 492 44 XDT User s Manual Appendices Appendix F Sensor SpanCheck Theory of Operation The Sensor is constr
5. 5 Leaks 6 Hygroscopic materials in sample system It is usually more satisfactory to bleed a sample gas at atmospheric pressure through the sensor sampling chamber and to use 1 8 3mm o d sample pipe See below re sample pipe material also see section 2 3 Dry Reading SpanCheck wrongly set or faulty Sensor Verify SpanCheck or return sensor for full calibration to your representative Leak in system or use of unsuitable pipe Cure the leak or replace unsuitable pipe with copper or stainless steel Flexible con Wet Reading nections should be made with PTFE pipe NEVER use rubber or plastic pipe Comparison of readings with manual cooled mirror instrument This type of indicator reads about 10 C dry at about 50 C dewpoint due to tempera ture gradients within the device The error increases at drier levels Display Shows Prolonged exposure to wet gas Dry down the sensor install sensor in either a known dry gas stream i e instrument quality air or dry nitrogen or place sensor in a dry can or bottle of desiccant and seal the container from outside air the shipping container is designed for this purpose also see section 3 4 4 3 1 Display Shows 1 Instrument Failure Disconnect cable from input terminals if the instrument still reads SHR the problem is with the instrument However if the instrument reads OPNthen reconnect the cable to the input terminals and check possible causes 2 or 3
6. 1 Display of alternate units In this mode a second engineering unit can be chosen to be dis played alternating with the engineering unit selected in the operating state for example a dewpoint can be alternately shown in C and in PPM 25 XDT User s Manual CAUTION 2 3 4 and 5 are set at the factory and need only be modified when a sensor is changed 2 Selecting the sensor type In this mode the user can select the software matching the type of sensor installed in the instrument XT1 XTR 100 100 C to 20 C XT6 XTR 65 65 C to 20 C DB show impedance of any sensor disable Open and Short error massages 3 amp 4Adjusting low end sensor attenuation and dewpoint These modes are used to enter a data pair representing a low dewpoint and the sensor attenuation measured at this low dewpoint see Sensor Theory of Operation appendix F This data pair should not be modified unless the sensor is replaced refer to procedures for replacing a sensor in appendix L The sensor ship ping container is labeled with the proper values 5 Calibration Adjustment In this mode the user can enter a sensor specific Adjustment Value to improve the instruments accuracy in the range of 50 C to 10 C this adjustment has very little or no effect outside this range The Calibration Adjustment Value is printed on the ship ping container supplied with the sensor or may be derived if the sensor can be exposed to a known referenc
7. DEE CAES ERA ciones Ds A C where DCI selects the eee Escape A 01 an the advance to 1 dot per line Escape K nnmm selects the graphic mode with mmnn bytes to follow then the graphic bytes are sent 1 byte per horizontal dot corresponding to 1 F or C being plotted where the MSbit represents the dot the other bits are not used Line Feed amp Carriage Return advance the line Escape A 09 sets the advance to the normal 9 dots per line DC3 deselects the printer In addition every 200 lines a text line will be sent to alternately time stamp the plot or label the extreme dewpoint axis This will produce a graph which looks as follows EE De a ce 2 ES GE SN el en arendal Sak Bas nd af ER EE ET 17 15 48 oa A E e BADE See E PS AA IN EA NE MEL YA RE SE Pen A q e os o ME Go ba y o is a rs tal e arts o ag igo es 4200 53 XDT User s Manual Appendices The printer should have at least 80 character columns and it is best to use continuous form paper 2 command Requests a single report of the measurement in the currently selected format send The unit will respond in the format selected with the Data command for example receive B1 59 3degCSp01 23 455pNoAlrmE R p The default factory setting for the instrument is to respond in numeric format in the user chosen units See the section about the DATA command for more details Serial Number Command C send SN gr receive Ser pNum gt pnnSg F where nn is the
8. E U Z x H 0 7 S L where I current supplied by XDT analog output in mA Z value of zero output of current loop in mA for 4 20 4 for 0 24 0 H value of High end of Analog Output range converted to selected engineering units L value of Low end of Analog Output range converted to selected engineering units D dewpoint measured by instrument in selected engineering units S span in mA of current loop output for 4 20 16 for 0 24 24 Consult section 3 4 5 7 amp 8 and or appendix B to check and set the Analog Output low and high ranges the factory default settings are 100 C and 20 C respectively For example a unit with factory default settings supplying 12mA is computed to be measuring a dewpoint of 40 C 12 4 x 20 100 16 100 40 Note that the computation is such that the current is linear to the selected engineering units Hence selecting ppmV or LBS or G M3 units will cause the analog output to be linearly propor tional to those units approximately logarithmically proportional to dewpoint refer to the graph that follows Naturally selecting C or F will cause the analog output to be linearly proportional to dewpoint When monitoring in ppmV or LBS or G M3 the analog output low amp high ranges may have to be adjusted to provide a useful output Consider an example where the area of interest to be moni tored is 10 to 100 ppmV and the analog output is set up with the facto
9. 2 230 40 XDT User s Manual Appendices Appendix D Optional Sensor Fittings pa 3 55 LG D MAG i HE ke Ne BNC CONNECTOR SINTERED METAL FILTER GUARD RETAINING WASHER WRENCH FLATS 625 18UNF THREAD 181 136 O nn 2 6 WRENCH FLATS O RING N AA ee HL I p s 4 Pit ft Ur Hit a SINTERED EN FILTER GUARD RETAINING WASHER MI4 X 1 25 THREAD ISO 228 G1 2 A PIPE THREAD pa 3 56 gt 2 21 875 SEALING SURFACE WRENCH FLATS m HA I er err ie E 4 SINTERED METAL FILTER GUARD RETAINING WASHER M14 X 1 25 THREAD Bi 875 WRENCH FLATS 1 ee Dado ea SINTERED METAL FILTER GUARD RETAINING WASHER 500 14 NPT THREAD 41 XDT User s Manual Appendices Appendix E XDT Circuit Board Dimensions a 4 250 gt hat 3 875 gt lat 3 502 lag 2 125 gt Optional Key Pad 8 88 ptional Key Pa 82 Connector TOP VIEW S oo SIDE VIEW y y 0 44 AA 199 XENTAUR CORP oo DEWPOINT TRANSMITTER C US 8 000000000000000000000 ig 3
10. Pressing the Pressure Correct button will cause the instrument to momentarily display 150 HRS LEFT indicating that there are 150 hours left until the next scheduled calibration is per formed This is a useful indication in cases where it is not known when the next calibration will be performed e Press the MODE button the display will show BEG S C prompting to begin the Self Calibra tion If the MODE button is pressed the calibration procedure will be canceled and instrument will go to the Serial Number mode All setup will still be in effect e 1 newly entered reference dewpoints the scheduled interval time etc will still be used by the system If the DOWN button is pressed the Self Calibration corrections will be disabled any Self Calibrations performed previously will not be used in correcting the computed dewpoint of the instrument However newly entered reference dewpoints and the scheduled interval time will still be in effect thus when the time elapses a Self Calibration will be performed and its values will be used in correcting the computed dewpoint from that time on e Press the UP button to initiate the Self Calibration the display will show CNF SC prompting for a confirmation that the Self Calibration should be performed If the DOWN or Pressure Correct buttons are pressed the Self Calibration will be aborted however everything set until now will remain in effect Press the UP button to confirm the Self Calibratio
11. To unlock the instrument the user must supply a password which consists of a number in the range of 1999 to 1999 approximately 4000 unique passwords Instruments that require a password will display SEC secured when the user attempts to unlock by pressing the UP button After approximately 1 to 2 seconds the instrument will display 000 with the first digit flashing The flashing denotes the cursor posi tion which means that the UP and DOWN buttons will increment or decrement this digit respectively Pressing the MODE button will move the cursor flashing digit to the right Press ing and holding the MODE button will signal the instrument to read the password and if correct to unlock the instrument As discussed above an unlocked instrument will display r UN LOC The user may enter the assigned password by pressing the UP DOWN and MODE buttons The first digit is unique in that it consists of 1 digits in the range of 19 to 19 this allows entering the full range of assignable numbers An example is used to illustrate the unlocking of a password protected instrument Suppose the password is 1234 After an attempt to unlock the user will see SEC followed by 000 with the first O flashing Pressing the UP button twelve times will display 1200 overshooting a num 27 XDT User s Manual ber can be corrected by reversing the use of the UP and DOWN keys with
12. date 5 Expose the sensor to in hand micro climate and push the UP button again to confirm that you want to start the calibration procedure The display will flash ACfor 60 seconds while the sen sor 1s saturating Make sure you keep the sensor exposed to in hand micro climate until the display shows END 6 After 60 seconds the display will flash the selected sensor type see Selecting a sensor type 3 4 5 2 and then the instrument will calculate the slope and offset of the sensor curve while displaying the calculations and then will display ENDfor a few seconds after which the instru ment will automatically go into measuring mode The sensor calibration is completed The display may flash SAT indicating that the sensor has super saturated As soon as the sensor is exposed to an atmosphere with a dewpoint lower than the saturation dewpoint the display will indicate the dewpoint measured by the sensor The display may show alternating SENand 2LO as an indication that the measured capacitance is too low to be from a saturated sensor in this case make sure that the sensor is properly plugged in and repeat the calibration procedure 7 Install the sensor in the sample cell or adapter fitting or put it back into the packaging con tainer for later use 21 XDT User s Manual The instrument will retain the calibration even if the power is turned off Under certain conditions an over super saturated sensor may need to be completely dri
13. 40 C dp overnight then the dewpoint was abruptly changed to 60 C the change is depicted below as time 0 The graph below shows the percent change of recorded dewpoint C the same data is also shown in percent change of the recorded dewpoint converted to ppmV It is immediately obvious how a sensor that has response times exceeding ten minutes can be claimed to have response time of 3 minutes simply by manipulating the units of measure The logarithmic relationship between dewpoint and ppmV makes the ppmV reading appear faster Since the response time is stated in percent change the units of measure are automatically hidden from the audience 30 40 50 C 50 60 70 Percent Change Change OF bhm boh FELE 60 C 100 Verted meastrement 110 1 3 5 9 20 40 60 80 100 2 4 6 8 10 30 50 70 90 Time minutes 46 XDT User s Manual Appendices Of course analyzing on a wet up step will produce much faster results because all sensors are fast on wet up since Al03 like most materials adsorbs faster than it desorbs Testing with a small step e g in the 10 C to 0 C dewpoint range will produce even faster results and allow manufac turers to make far fetched claims of response time of 5seconds for a 90 of step change The cus tomer has to be aware of these manipulations of data and be able to ascertain the real world respo
14. A RET TxD RS 232 1 0 RxD CAUTION Connecting the RS 232C interface on instruments which do not have the option installed will damage the instrument RET a PS DC power 15V OUTPUT and or 15 30V INPUT 0 5A AC GROUND Not Connected NC NO C Not Connected NC NO C Note Options will function only if they are installed Cable access to the XDT NEMA enclosure is through three ports refer to appendix E which maintain the NEMA integrity One 1 2 NPT conduit fitting may be used for high or low voltage connections This port is intended for the power and high voltage relay wiring e Two watertight cable grips located at the bottom of the instrument for low voltage wiring only such as sensor analog output RS 232 or relays when used with low voltages They accommodate cables with diameters 0 196 to 0 315 To install a cable loosen the nut feed the cable through the grip and tighten the nut again Unused cable grips should be plugged to maintain the integrity of the enclosure 3 3 2 1 Connecting Power The XDT is typically provided to be field wired to operate from AC Mains Power of 100 to 250VAC 50 60Hz 10 VA the instrument has an internal 0 5A 250V fast acting fuse However the XDT can also be optionally ordered to operate from 15 to 30 VDC 0 5A with an internal 0 5A 12 Section 3 Instrument fast acting fuse Please follow the appropriate installation procedures in the paragraphs below accor
15. E E hermetically sealed relays 14 high pressures a aiaiaiaiasasassasasasasasasasann 3 hookup see connecting hydrocarbons aiaaaaaaaaiasasasasassasasasasasanana 5 Hysteresis suksessene 20 I IGT Research Bulletin 8 18 incompatible gases sssr in hand micro climate in situ installation coccion installation TSHUMENE desros 11 SENSOR its 4 7 interfacing analog output roereereerrerrernennensensenr 14 RS 232C vikan s a a 15 intrinsically safe uu u u 4 10 13 SOLA it deine 10 L LBS piaia et asas liquid water lock instrument LO WAB rd low deW A a hG low voltage DC powered option 13 M mains supply voltage aiaiai aa maintenance policy mechanical connections Micro Climate aiiiaiaiaiaiaiaiassasasasasasanaini millivolt output range Setting stasslslka sk dku veart 27 WIring uu 14 MODE button 230 16 mounting brackets aiasaiaiasssvasaii 11 N National Electrical Code 9 Natural Gas niiae orisni 18 NEC a NEMA NFPA compliant A V alarm 28 NIST artis ricino 1 58 NPE aske KEENE 1 O da ee co 3 operating State 2sa aaaassasasaasasasassai 17 operating state flow diagram 37 optionally ordered features capabilities 1 outdoor installation oo eects 9 AA a 10 OVERVIEW notarios e
16. Grounding Considerations aaiaaaaaaaaasaasassaasannssnsnnsnnnnnnnnnnnnnnnnnnnnnnninnnnnnini 49 Appendix J Analog Output vs DeWpOM Es trae 50 Appendix K RS 232C Interface Protocol aaaaaaaaaaasaaasaasansannsansnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnini 52 Appendix L Procedure for Exchanging DT Sensors iaaaaaaaaaaasaassasssassassnsssnssansnsssnnsansaniai 55 Appendix M Uncertainty in LBS ppmV calculations aaaiaaiaaaaasaassassassasssnssassnsssnssanaas 56 A eR SOP Me RCTS PT n 57 vi Section 1 Introduction 1 0 Overview of the XDT The XDT is a microprocessor based hygrometer for measuring moisture content in gases in the range from 100 C to 20 C dewpoint depending on the sensor ordered The XDT uses the Xen taur Hyper Thin Film HTF sensor which is encapsulated in sintered stainless steel thus it is capable of coming into contact with a wide variety of environments However one should keep in mind that the sensor is a delicate device and it should be handled accordingly The measurement is displayed on the instrument s custom LCD can be transmitted by optional analog and digital outputs and can control optional programmable relays Four front panel but tons provide the user with a rich feature set The XDT s advanced design allows it to be housed in a variety of enclosures The XDT has an impressive set of dewpoint measurement capabilities in terms of accuracy stabil ity response time etc
17. Set Scheduled Calibration I50 H S LEFE View Hours left until p 38 Interval in hours next Scheduled i 20 0 blank Scheduled SelfCal disabled Calibration ES Stet but SelfCal corrections not affected T css values 1hr i 2 e timeout gt eb Begin Self Cal Now The Self Cal Corrections 5 will not be used in dew i computations from now on E ep cancel disable Self Cal corrections until another Self Cal is O Z performed manually or S O scheduled Schedules o E Confirm performing are not affected ou Self Cal NOW O 2 abort performing Self Cal Now oc gt 5 x Scheduled Time Elapsed l 4 Entry Point v 2ella During Self Cal the Analog output and Alarm Relays are frozen to their previous states ell S Beall oD I F CAL 4Y 15 C Ls 14150 M C Fla 42 0 Cl 542 pear RR FL 250 14 1 571 dew is stable Roe gaslo a perform lt sa 2 2086 LET sett ca LE 83 amp Electric Valve Activation and Dewpoint stable testing Electric Valve Deactivation and final o 15 min time out for system stabilization 0 5 C for 3 min Displays Dewpoint stable testing 0 5 C for 3 min performed only if electric valve is installed dewpoint being measured now Performed only if electric valve is installed Displays dewpoint being measured now Displays dewpoint being measured now e y o SET NUMBERS s few sec CALCULATING Sensor F sAr EG CnF ACP S CALIBRATION Reading N G o 1 minute Press toget
18. XDT User s Manual Appendices Appendix M Uncertainty in LBS amp ppmV calculations Uncertainty of LBS 8 ppmV calculations due to 3 C measurement accuracy Calculated LBS H20 mmscf o o 8 o g 2 s R a 3 RBRBRE 20 25 30 35 2 40 Q 45 jo a 50 jo v 5 D 55 o 60 65 70 75 80 g N Sr SSG A N w AR 900 o oocoo o d S S 66056 a ONDwO ooL 007 00 00y 00S 009 002 008 006 Calculated ppmV 0001 56 Xentaur Return Authorization Number Request Form e Xentaur must approve and assign a Return Authorization Number RAN to any instrument being returned e The RAN must appear on all paperwork and packaging e The issuance of a RAN does not automatically imply that the instrument is covered by our warranty e In order to serve you better and protect our employees from any potentially hazardous contaminants Xentaur must return unopened at the senders expense all items that do not have a RAN To obtain a RAN fill out this form and fax to 631 345 5349 this document may be obtained in electronic format at www xentaur com and e mailed back MY Company Name Address GE 8 8 Contact Name SE Phone ee i Fax Part or Model Number Serial Number Original Purchase Date PO Number Equipment Rea
19. a trip point at any dewpoint within the range of the selected sensor There is also a selectable hysteresis with a minimum value of 0 5 C to prevent relay chatter which allows driving systems such as regen erative dryer purge valves in dewpoint demand mode The polarity of the alarm is also select able thus one may choose whether the relay energizes above or below the trip point to allow fail safe design in case of XDT power loss or in case of any other errors or failures which will cause the relays to de energize When an alarm relay is deenergized the corresponding HI and or LO indicator flashes on the dis play while viewing the dewpoint The behavior of the alarm when a sensor failure e g open or short is detected is also program mable The options upon sensor failure are 1 Fail High put the alarm in a state as if the dewpoint is high e g AX H 2 Fail Low put the alarm in a state as if the dewpoint is low e g AX L 3 Fail Flashing Energize Deenergize the relay alternating once every 2 seconds e g AX F 4 No Special Handling if sensor is open the alarm is in a low dewpoint state if the sensor is shorted the alarm is in a high dewpoint state e g AXN Setting or checking the present setup of the alarms is illustrated with the following example EXAMPLE Set the HI alarm to de energize the relay when the dewpoint is wetter than 75 C with minimal hysteresis 0 5 C and faults such as sensor fail
20. and re calibrate the sensor This is referred to as SpanCheck The advantages of this unique capability of Xentaur HTF sensors and instruments are obvious in time and cost savings for re calibration as well as ease of sensor replacement Xentaur HTFTM Sensor Dewpoint vs Capacitance Response Curve 200 160 120 Capacitance nF 80 40 45 XDT User s Manual Appendices Appendix G Dewpoint Response time Analysis Manufacturers of dewpoint sensors will make unbelievable claims of speed But without support ing data revealing the conditions under which the measurements were made such as flow rate temperature the dewpoint at which the test was performed and most importantly the units of measure This last aspect can be extremely deceiving consider the following example At Xentaur we have performed a variety of tests to determine the response time of ours as well as the competitor s sensors For this discussion let s consider a step change of 40 C to 60 C dew point in other words a challenging but typical dry down An XTR 100 sensor w SS sintered filter was placed in an electro polished stainless steel manifold the temperature was 23 C and the sam ple flow rate was 3 LPM The dewpoint was generated with a computer controlled mass flow valve gas dilution dewpoint generator and was verified with a NIST and NPL calibrated MBW chilled mirror The system was allowed to achieve equilibrium at
21. comparable 0 5A 250V fast acting fuse to locate the fuse refer to the XDT mechanical drawing in Appendix E 29 XDT User s Manual DISPLAY EXPLANATION REQUIRED ACTION LO ERR PROM check sum failed 2 pA HI ERR RAM write read test failed cycle power H ERR Unidentified power up failure S if problem persists Q a CS F EEPROM Check Sum Failed return to your representative ERR AD A D converter failure for service E ERR REF Reference voltage for A D out of spec a V a LO BAT Low supply voltage 3 3 LO RNG Instrument low temperature range 2 TEMP has been exceeded a make sure that the unit is at a o HI RNG Instrument high temperature range gt temperature of 10 C to 50 C TEMP has been exceeded CPN Sensor circuit is open gt a SAT Sensor is saturated oo see table in sensor troubleshooting section 2 5 28 SHR Sensor circuit is shorted 2 F 3 o Trying to calculate dewpoint for undefined sensor F select sensor and recalibrate DB Trying to calibrate an undefined sensor g E 2 see calibration instructions SEN 2LO Sensor reading is too low to be from a saturated sensor 2 2 thus can not be calibrated 3 2LO While Compensating for cable length the measurement did not oa Check the means of opening amp shorting the sensor correspond to the expected open or short values 2
22. correcting the computed dewpoint of the instrument Press the UP button to initiate the Self Calibration the display will show CNF SC prompting for a confirmation that the Self Calibration should be performed If the DOWN or Pressure Correct buttons are pressed the Self Calibration will be aborted Press the UP button to confirm the Self Calibration The display will show alternately S C STB 41 5 indicating that Self Cal Stabilization is being checked and currently the instru ment is measuring 41 5 C When the measured dewpoint is stable within 0 5 C for 3 minutes the instrument will record the new single point self calibration values and finish by going to the display dewpoint mode Note that the program will spend at least 3 minutes on this stage of the calibration The sensor may now be exposed to the sample gas and the instrument will display the mea surement using the newly acquired calibration values Scheduled Timer Activated Single Point Self Calibration procedure for instruments with electrically actuated switchover valve and on board battery backed real time clock Make sure that your sample system is properly connected according to the sample system instructions When the time outs and stabilization times are summed from the calibration stages below it can be determined that the calibration reference gas will be used for at least 18 minutes the user should make sure that there is sufficient amount of gas available If the re
23. shall be included in the installa tion It shall be in close proximity to the equipment and within easy reach of the operator It shall be marked as the disconnecting device for the instrument For the XDT NEMA use the 1 2 NPT conduit fitting as the power cable access do not use the cable grips they are for low voltage use only 3 3 2 1 2 Low Voltage DC Powered Option Electrical Power Connection When an XDT is configured with the low voltage DC power option it can be powered by apply ing 15 to 30 VDC 0 54 to the PS 12 and RET 11 pluggable screw terminals The positive supply must be connected to PS while the negative or ground to RET The AC terminals must not be connected Note that the DC supply is ground referenced to the analog output and RS 232 grounds 3 3 2 2 Sensor Connection The sensor input terminals are labeled SIG IN 5 for the center core of the coaxial sensor cable and SIG RET 6 for the outside braid of the cable Factory supplied coaxial cables have a BNC connector at one end to mate to the sensor and pigtails at the other end to be placed in the screw terminals of P1 the black pigtail is the braid and should be connected to the terminal marked SIG RET The coaxial cable can be as much as 3 000 ft long however if the cable is changed for a longer or shorter one the instrument must be compensated for the new cable see section 3 4 5 11 The instrument is properly compensated for the cable
24. supplied from the fac tory Consult your representative for obtaining the proper cable 3 3 2 3 Wiring the Alarm Contacts The optional alarm relay contacts are located on the terminal strip P1 The terminal strips are marked to indicate wipers and normally open and normally closed contacts of the two indepen XDT User s Manual dent relays corresponding to the HI and LO alarms The relay contacts are rated at 10A 250VAC or 30V DC instruments for use in division 2 Hazardous Areas have hermetically sealed relays rated at 3A 125VAC Use wiring appropriate for the voltage and current that will be switched by the relays Also see section 1 3 for EMI considerations Keep in mind that the relay polarity is programmable thus wiring should be designed to provide a fail safe operation in case of power failure See section 3 4 4 2 Also note that while viewing the dewpoint the display will flash HI and or LO as necessary to indicate that the corresponding alarm relay is de energized Specially ordered instruments may have a third alarm refer to the supplied addendum for relay contact rat ing pinouts and user interface issues 3 3 2 4 Interfacing to the Analog Output The optional Analog Output may be a voltage or current depending on the ordered configuration The Analog Output signal is provided on the P1 connector when wiring please observe the polar ity indications The positive terminal is on pin 7 it is labeled A OUT and the negative
25. use of four screw holes on the back bottom of the instrument enclosure Open the instrument cover for access to these screw holes They are located at the corners of the enclosure and outside of the NEMA seal Do not drill other mounting holes as you may compromise the seal Refer to Appendix E for all relevant dimensions 3 3 1 3 XDT OEM bare board Installation When mounting the circuit board in a user supplied enclosure using standoffs be sure to use insu lating washers Refer to Appendix E for mounting hole dimensions and required mounting dimen sions XDT User s Manual 3 3 2 Electrical Connections All connections are made via a 21 contact pluggable screw terminal block referred to as Pl 0 5A 250V 1 Power Supply Module 1 10 0047uf i i RFI filter board Sensor Logic ground and AG Power ground are connected for safety and electromagnetic interference considerations A Ordinary relay contacts 10A 250VAC or 30VDC Hermetically Sealed relay contacts 3A 120VAC ALARMS Instrument Circuit board Pluggable Block Terminals 4 3mH mV Tt 0 1uf 1 AC L i Ming Measuring 3 Circuitry 0 tuf 1M Ohm from HI o 20 TI ONO FR WN gt AC LIVE AC NEUTRAL Not Connected AC GROUND AC Power Input 100 to 250VAC 50 60Hz 10VA SIG IN white Gre E SENSOR CABLE A OUT Analog Output 4 20mA or 0 24mA or Voltage
26. 1 P parts per million by volume 17 password protection Saa plastic tubing sirens incinn 6 pluggable screw terminal 12 pounds of H20 per million standard cubic feet senest 17 PPM ppMV T na aa 17 precautions instrument iaiaiaiaaaaaasasasasnsnsnansnanananana 9 O S 3 present setup of alarms owe 19 AA skudt PRESSURE CORRECT button pressure COITECtiON aiaiaaiaiaiaiasaiaisani pressure operating range pressure regulator aaiaiaiaiaississsasasana AAA ae pure gases push buttons aaaiaiasaiaasasasasas sssssassanana 16 R range dewpoint a aaaaaaiasasaasasasassssasa 4 TECOBNIIONS in 4 10 relay Contacts Silva l east hermetically sealed WIDE las ad oss ane repas ude i repeatability representative resetable A V alarm sesser 28 resolution response tiMe aiaiaiiaiaiaisisssasasasasaini 4 46 returning equipment savasai vici iv RS 232C INterfacing coat 15 Protocol viii 52 rubber tubing gae eei tensas 6 S Safety canta ia 9 sample flow range aaaasaiasassasssasassai 4 sample treatment od selecting sensor type a aiaaaiasasasaiaia 26 self calibration flow diagram 38 59 Index sensor cable compensation 2aaiasasasa ia 28 COnnection ss 13 container iii 3 dimensions 40 exchange procedure w9 pressure nun
27. 8 A 1 y 8 E ode 1 E SY 0 740 o N gt N s3 a a 2 140 pr P no00000000000000000000 R CJ s 8588 MADE IN USA 2 R NAVN o ennn 5 j OG J F M A M J J A S O N D lt score line break to fit in PM box gt 8 lo Y v se 6 CAUTION N RELAY VOLTAGE FR NN ower NN FUSE on EN ide N I N 100 250VAC side mounted L ti 50 60HZ RFI daughter I N Q Q x R NOVA board per N N 6 e 6 lt lt N ra0aQ 1 Di 2 2 z oo NLO O awxxf OOD D OO o ZZ o 2 aenrrdt tc HOD lt lt P1 Y loose ooo 0 66 6 6 66660 soi aaa N I 1 RFI daughter board gt 0 197 5mm typ i FB B A A y se IS Y P 4 hat 0 700 Pluggable Screw Mounting Holes i pt 0 350 d 0 150 6 places Terminal Connector outline p gt al 0 158 ma 3 900 gt 42 XDT User s Manual Appendices Appendix E continued XDT PM Enclosure Mounting Dimensions with gasket and clip on screw clamp mounting brackets CONNECTOR 21 POSITION TOP VIEW E i 5 660 PANEL THICKNESSES UP TO 135 INCHES 10 GA OR 3 4 MM MAY BE ACCOMMODATED al 2 81 E PA SIDE VIEW BACK VIEW 2
28. IE oratorio edison sas 14 Index voltage mains supply 0 eee 10 Ww warning labels ssec iii warranty niv AA ENEE i 3 weather proofing aaiaiaaaasaiaiasasnsnanasananann 9 weight u u uu u 10 WIIG rc 9 alarm relay contacts 13 analog output 14 POWEL 12 requirements 10 RS 232C 15 SENSOL na 13 60 XENTAUR CORPORATION 84F HORSEBLOCK ROAD YAPHANK NY 11980 U S A TEL 631 345 3434 FAX 631 345 5349
29. TF high capacitance Al 03 Dewpoint range XTR 100 148 F to 68 F 100 C to 20 C XTR 65 85 F to 68 F 65 C to 20 C Capacitance 15nF to 200nF ACCULACY sannir 5 5 F 3 C refer to appendix M for accuracy expressed in other units of measure Repeatability 0 9 F 0 5 C Response time refer to Dewpoint Response time analysis in Appendix G Operating Temperature 14 F to 158 F 10 C to 70 C non condensing Storage Temperature 40 F to 176 F 40 C to 80 C non condensing Sample Flow range linear velocity 1ATM Static to 100m s Enclosure a siasa ici encapsulated in 100u sintered stainless steel Calibration method Highly uniform sensors calibrated at low dewpoint and SpanCheck sensor saturates at dewpoint above 68 F 20 C NIST NPL traceable multi point factory calibration available optionally Pressure operating range Standard 500 PSI 34 bar Optional 5 000 PSI 340 bar Mechanical connections 14mm x 1 25mm sparkplug threads and 16 threads standard Optional configurations G1 2 1 2 NPT 5 8 18 and others Electrical connections Female BNC connector Sensor signal cable RG58 coaxial cable or for lengths greater than 100 RG6 coaxial cable max 3 000 Approvals Classifications CE for electromagnetic compat
30. TR65W sensor is best suited for these applications Also consider the need to isolate depressurize before installing or removing the sensor In Line Installation Sensor Measuring at Line Pressure LE NOT RECOMMENDED Main Gas Line Bypass Installation Sensor Measuring at Line Pressure Bypass Control maintain differential pressure to provide adequate flow through sample cell The sensor measures the dewpoint at whatever pressure it is at The instrument is equipped with a pressure correction feature which allows reporting the dewpoint at a different pressure XDT User s Manual 2 3 2 Extractive Installation For extractive installations we recommend our sample system ESS which may be equipped with a variety of features such as isolation valve coalescing or particulate filter pressure regulator calibration sample injection or extraction port pressure gauge flow meter weatherproof enclo sure Refer to the ESS literature for more information If the resources to make your own sample system are available the following two diagrams may be used as a guideline to configure a simple system Regulator or Needle Valve Extractive Installation Sensor Measuring at Line Pressure Gas Line Regulator or Needle Valve Extractive Installation Sensor Measuring at Ambient Pressure Gas Line It is generally recommended to measure at ambient pr
31. The specifications of the sensor are discussed in section 2 2 while the spec ifications of the instrument are discussed in section 3 2 A summary of the standard and optional features amp capabilities of the XDT are listed below as an overview aid to the user tan Featur biliti e Locking of instrument preventing unintentional changes e SpanCheck automatic recalibration using room air all instruments pre calibrated at fac tory e Capability to enter up to 15 NIST NPL traceable calibration points at factory depending on order e Manual Self Calibration a single point calibration using a known standard gas High accuracy can be maintained even in the most harsh applications e Pressure correction built in software calculation of dewpoint at a pressure different than the measurement e Cable length compensation user initiated automatic self measuring software e Universal global autoranging AC supply 100 250VAC 50 60Hz Instrument and Sensor UL amp cUL listed recognized CE electromagnetic compatibility certi fied Optionally ordered Features Capabilities e Password protected Locking of instrument preventing unauthorized changes e Alarm Relays programmable set points error handling and hysteresis Up to 3 alarm relays may be ordered On display legends indicate relay states e Audio Visual Alarm complies with recommendations of NFPA 99 1996 edition audio reset and test buttons e Analog Output factory set volta
32. User s Manual Dewpoint Transmitter 5 Model XDT Ae 94 T XDT User s Manual When calling your representative for technical support please have your serial numbers available The Sensor and Instrument Serial Numbers are on the instrument also see section 3 4 4 4 Sensor Serial No Instrument Serial No Your Representative is Except as may be provided by contract this document and all specifica tions and drawings contained are the property of Xentaur Corporation are issued in strict confidence and shall not be reproduced or copied or trans mitted in any form or by any means or used as the basis for the manufac ture or sale of apparatus programs or services without permission Check the Internet for updates the latest revision of this manual is available in Adobe Acrobat for mat at http www xentaur com Document No XDO 01 D 0000 Rev 2 1 5 10 02 Copyright O 2000 by Xentaur Corporation XDT User s Manual Xentaur reserves the right to change or modify the product specification and or appearance at any time without notice Therefore the information in this document is subject to change without notice and does not represent a commitment on the part of Xentaur Corporation The customer agrees that in accepting and using this instrument Xen taur Corporation s liability arising from or in any way connected with this instrument shall be limited exclusively to perform
33. alibration pro cedure and install the sensor in the sample stream immediately after the calibration procedure is completed If you are not ready to use the sensor right away after calibration put the sensor back in the shipping container for dry storage The instrument must be calibrated with the sensor it will be used with The calibration procedure takes advantage of the sensor s ability to saturate refer to Appendix F and is executed by the instrument computer by performing the following steps If a single point calibration is in effect with a reference dewpoint below 70 C it should be dis abled see next section before performing SpanCheck calibration 1 Tf the instrument is locked and a calibration is attempted it will display LOCand will not per form the calibration To unlock the instrument consult section 3 4 5 10 2 Push the MODE key a few times until the display shows CAL 3 Press the UP button The display will show CNF prompting you to confirm that you want to start the calibration procedure You can abort the calibration procedure by pressing the MODE key 4 Remove the sensor from its packaging container or sample stream so that the porous metal filter 1s visible and the sensor is exposed to in hand micro climate refer to explanation below Close the packaging container as soon as you have removed the sensor to avoid degra dation of the desiccant inside the container You may want to re use the container at a later
34. alve e Refer to the unshaded area of the flow diagram on the second page of Appendix A e Expose the sensor to a known dewpoint e Wait at least 15 minutes for the sample system to be stable if the known gas is of a low dew 22 Section 3 Instrument point the waiting time may have to be increased specially if the sensor was wet before the procedure is initiated Consult with your representative to determine sufficient waiting time for your application Make sure the instrument is unlocked Press the MODE button a few times until the display shows CAL Press the DOWN button to select the Self Calibration mode The display will show SLF CAL Press the UP button to confirm entry into the Self Calibration mode The display will show the reference dewpoint which has been previously programed into the instrument the SET and DEWPOINT legends will also appear Use the UP and DOWN buttons to modify this dew point to match the dewpoint of the known gas to which the sensor is exposed Press the MODE button the display will show BEG S C prompting to begin the Self Calibra tion If the MODE button is pressed the calibration will be canceled and instrument will go to the Serial Number mode All setup will still be in effect e i newly entered reference dewpoint will remain in the instrument s memory If the DOWN button is pressed the Self Calibration corrections will be disabled any Self Cal ibrations performed previously will not be used in
35. amage is determined to have been caused by misuse or abnormal conditions of operation the owner will be notified and repairs will be billed at standard rates after approval Maintenance Policy In cases when equipment fault is suspected please notify your representative of the problem be sure to provide them with model and serial numbers If the problem can not be resolved then ask for a Return Authorization Number RAN and shipping instructions Issuance of an RAN does not automatically imply that the equipment is covered by our warranty that will be determined after we receive the equipment Pack the equipment in a suitable box with sufficient padding include the RAN number on your paperwork and send the equipment prepaid to the designated address Equipment returned without an RAN or with reversed shipping or import export charges will not be accepted If the warranty has expired or the damage is due to improper use or exposure of the equipment then the repair facility will provide an estimate and wait for approval before commencing repairs For your convenience a Return Authorization Request Form is provided in appendix N it must be com pleted and sent back to the provided destination in order to obtain a RAN XDT User s Manual Table of Contents 1 0 Overview of the Dewpoint Transmitter model DT srrrronnrnnennrnvennrrennrnvennrneennrneennrnssnneee 1 2 Sensor and Sampling Techniques ii 3 2 1 Precautions using the sensor a
36. aracters with the 7 segment numeric display the following pseudo alphanumer ics are used Numbers 0123456789 0123456789 Letters ABCDEFGH IJ LNOPQRS TUXYZ ABCDEF GH I LNOPQRSTUXYZ Symbols 9 2 The instrument will indicate whether a particular mode allows changing a parameter by show ing the word SET in the upper left corner of the display Be careful not to change any parameter inadvertently 3 C F appear simultaneously to indicate the sensors attenuation in decibels 4 Values larger than 1999 or smaller than 0 01 are displayed in powers of 10 As required either a 10 gt or 107 will appear above and to the right of the displayed value the value will be rounded off to 3 digits The display will show RNG out of ranGe if the number to be displayed is larger than 1 999 000 Twelve examples follow for each the number and units desired to be displayed are shown in italics depicted immediately below them is the resultant 3 digit LCD display 1104 2 20 C 68 F 23 612 ppmV lbs eg j x10 CU bo 235 FU DEWPOINT DEWPOINT DEWPOINT DEWPOINT LBS 17 688 grams H O meters 2 000 000 100 C 148 F 1169 cal 00 40 DEWPOINT G M3 DEWPOINT DEWPOINT 0 013 849 0 000 921 15 0 000 014 75 f vom V lbs H O mmSCF grams H O meters 0 000 000 I x103 xo x103 385 92 Di D DEWPOINT DEWPOINT LBS DEWPOINT G M 3 4 3 Push Buttons Four push buttons provide user
37. ation is accom plished by attaching 2 clips one on each side of instrument and inserting the instrument into the panel cutout Pressure must be applied along edges of instrument until it is firmly seated The XDT PM may be ordered with an environmental seal option This option provides a gasket installed at the factory to seal the face plate to the enclosure box and a gasket to be installed by the user to seal the enclosure box to the user s mounting panel To achieve a good environmental seal the XDT PM must be mounted onto a rigid flat panel with a cutout according to the specified dimensions using the provided panel gasket and all four provided mounting brackets The instructions listed below should be followed If the clip on mounting brackets are installed on the instrument enclosure remove them e Make sure that the panel gasket is flat and even around the box bezel Handle the gasket care fully as not to tear it e Insert the box into the user s panel cutout consult with drawing in appendix E for proper panel cutout dimensions e Attach all four mounting brackets to the instrument enclosure from the rear of the panel make sure they are fully locked in e Use a screwdriver to tighten the mounting bracket screws all four screws should be tightened uniformly the panel gasket should be compressed 3 3 1 2 XDT NEMA IP65 Enclosure Installation The instrument can be installed as a wall or panel surface mount by making
38. calibration has finished and it is measuring a dewpoint of 42 C When the measured dewpoint is stable within 0 5 C for 3 minutes the instrument will unfreeze the analog output and relays and go to the display dewpoint mode 24 Section 3 Instrument e The instrument will display the measurement using the newly acquired calibration values The instrument computes the dewpoint from the measured capacitance of the sensor The sequence of computations is as follows e The capacitance is converted to percent of full scale 100 C to 20 C dp using the low dB low dew and saturated dB when performing SpanCheck values e Cal Adj is applied to correct the mid point of the curve e If enabled the multi point calibration table is applied to further correct the transfer function e If enabled the single point calibration is applied to fine tune the transfer function e The corrected percent of full scale is converted to dewpoint 3 4 4 4 Viewing Serial Number Mode In this mode the user can view the instrument serial number The display shows the serial number by alternately displaying XSN and the number If the number is larger than 1999 then it is dis played in 2 parts first part is the thousands signified by the x103 legend in the upper right corner of the display and the second part is the units For example serial number 12345 will be shown as 103 im Pressing the UP and DOWN buttons simultaneously resets the in
39. cated by the presence of the DEW POINT legend on the lower left of the display The available engineering units in which to view the moisture content are C F PPM LBS and G M the UP and DOWN buttons scroll back and forth through these units in respective order The C and F are dewpoint readings The PPM is XDT User s Manual parts per million by volume computed at the sensor pressure more about pressure later The LBS and G M are density measurements pounds of water per million standard cubic feet and grams of water per standard cubic meters respectively both in Natural Gas they are computed accord ing to data derived by IGT Research Bulletin 8 taking into account sensor pressure Note that the analog output is linear to the selected engineering units therefore be mindful that while scrolling through various units the analog output may change even though the measured dewpoint is stable The PSI legend flashes at the bottom of the display when there is pressure correction in the com putation of the displayed values A short press of the pressure correct button toggles the unit in and out of pressure correct mode When there is no pressure correction applied the PSI legend does not appear Sensor Pressure is used in the context that this is the pressure inside the sample cell when per forming the measurement i e it is the operating pressure of the sensor Gas Pressure is used in the context that this is th
40. coaxial cable the letters numbers refer to the electrical characteristic of the cable resistance capacitance per foot of length A type of coaxial cable the letters numbers refer to the electrical characteristic of the cable resistance capacitance per foot of length a specification for electrical signaling also referred to as RS232 that describes the voltages rate of change of the voltages and the signal names and uses for the signals Request To Send a label for a RS232 interface control line equipment used to bring conditioned sample to the sensing element 1t may include regulators filters heaters coolers flow meters valves and other accessories reaching maximum holding capacity produced by a process of compacting and heating metal powder resulting in the formation of a solid permeable object partial stream extracted from a process stream of which it is repre sentative method to check the response of an HTFTM sensor at the upper end of its measurement range a measurement s degree of insensitivity to disturbances Underwriters Laboratories Inc an organization which evaluates tests and certifies products for specific safety situations quantification of the error that can be expected from a measure ment characterizing the range in which the true value can be expected to be in 36 XDT User s Manual Appendices Appendix A Flow Diagram of Operating State User Interface Power ON initialization 30 seconds a
41. control of the instrument They are designated MODE UP DOWN and PRESSURE CORRECT These push buttons are vertically lined up on the upper left side of the bare circuit board with the MODE button on top There is also a connector provided which allows the use of external switches The XDT NEMA makes use of the circuit board mounted push button switches to access them one must open the cover of the XDT NEMA enclosure The XDT PM is available in several versions With a solid silk screened front face plate which must be removed to access the circuit board Section 3 Instrument switches described above e With a front face plate which has labeled holes placed immediately above the circuit board switches thus the operator may push the switches without removing the face plate by making use of a probe such as a paper clip e With a front plate containing four membrane switches connected to the circuit board provid ing the operator with a easy to use interface XDT C 1999 XENTAUR CORP Y eae B eront mansur C dus DEWPOINT TRANSMITTER NON oooooooo0000000000000 M ol E o 5 5J at s z El P CEKAJ a R A R e888 Per MAMJJA Remove front plate to access control buttons consult the manual V r Y Panel Mounted Instrument with a solid silkscreened face plate DEWPOINT TRANSMITTER MODE o UP DOWN o PRESSURE CORRECT Bare board or Instrument opened for acces
42. dard optional NEMA 12 type protection gasketing available XDT OEM 4 25 x 5 15 x 2 25 0 6 lbs fully optioned without cables XDT NEMA 4 73 x 6 3 x 3 55 2 1 Ibs fully optioned w cables XDT PM 5 67 x 2 84 x 2 95 DIN 43700 standard 1 3 lbs fully optioned w cables refer to appendix E for detailed dimensions Operating temperature of electronics 14 F to 122 F 10 C to 50 C Storage temperature of electronics 40 F to 176 F 40 C to 80 C Humidity 0 to 90 RH non condensing Altitude 0 to 6500 feet 2000 meters 100 to 250VAC autoranging 50 60Hz 10VA internal 0 5A 250V fast acting fuse Optionally the instrument may be configured with DC power capability 15 to 30VDC 0 5A 21 contact pluggable screw terminal block 1 3mm diameter pins on 5mm centers For AC Power 18AWG or heavier wire an external means for disconnecting the power source is required to meet National Electrical Code requirements For Sensor signal RG58 coaxial cable or RG6 for cable longer than 100 A 6 foot cable is provided as a standard other lengths ordered as options When changing cable refer to cable compensation section 0 1 C dewpoint 3 5 digit backlit LCD with custom legends audible indicator C F PPM LBS H O mm scf gm H O m Four push buttons user s selections are stored in EEPROM Analog voltage by order or current user selectable 4 20mA or 0 24mA Linear to the selected engi neering units
43. de DION tias 57 Cc cable ACCESS Hide compensation SETSOL msn lie ar cabling alarm relay contacts oo 13 analog output ts POWER fs cited hes ene a requirements RS 232C a SENSOR sbn sasa Cal Ad li calibration adjustment calibration method 2 aaiaiasasvasaia capacitance Assist kA Gekscieestecasseucasvesne CE re CENELEC te certifications AN changing sensors checking alarms chlorine venias circuit board dimensions classifications 4 10 cleaning seine ead s 31 condensation aaiaaiaisasasaasasasaasssasassasaaa 3 connecting alarm relay contacts oo eee 13 analog output power RS 232C is SENSUL e CONAM ente contaminants control drawing ere 150 KSS iaa de Index Copper tubing sn sksslbsesngss lavssb vei ig 6 copyright i COITOSIVE BASES uiaiaiainiaisasasaiasasasaiaini 3 20 OSA EE ecient 13 0 6 DIEA ORE E ere 4 current loop COMPUTATIONS ionas 50 linearity VE EE EEE range Setting peresen iE span select4 20mA or 0 24mA EM ic WATTS aeie aeons E EEES Eei aS EE D DE powered crisi 13 degrees Centigrade ote 17 degrees Fahrenheit a aaa 17 DEMKO desiccant desiccant dryers aaaaaaaaaaaaaiasasnsnsnasasanann 5 dewpoint range dIApnoste Lista lente dimensions sidebar circuit board ONCLOSUTES eos SENSOR iri de
44. ding to the electrical power option on your instrument Do not connect to AC power without a proper ground connection For Intrinsically Safe installations first make sure that the equipment is qualified for the particu lar installation it should have a label specifying the certifications and the approving agency Then follow the appropriate control drawing as well as the instructions in the relevant paragraphs in this manual 3 3 2 1 1 AC Mains Electrical Power Connection The XDT is provided with a 6 foot 2 meter internationally approved AC power cord terminated with a connector according to the ordered option This cable is connected to the pluggable screw terminal block however it is provided strictly as a means of testing the instrument it should not be used in the final installation The XDT is intended as a field wired instrument permanently connected and installed according to the local nationally recognized procedures for equipment of this type and stated power requirements For North American installations use UL 62 and or CSA C22 2 No 49 18AWG cable with black white and green color codes For European and other international installations use CENELEC harmonized type cable with 0 82mm wire size or equivalent 10 amp use with brown light blue and green yellow stripe color codes The power wiring must be connected to the pluggable screw terminals marked AC LIVE 1 AC NEU TRAL 2 and AC GROUND 4 A switch or circuit breaker
45. e Deriving an Adjustment Value If the adjustment value for your sensor is not known contact your representative and follow the instructions below for entering known values If the value 1s not available then it may be derived using a manual method provided that a moisture cali bration facility is available The calibration must be done in the range of 25 C to 20 C attempting to calibrate outside this range may cause inaccuracies the dewpoint must be kept stable during calibration and it must be measured accurately by a reference instrument such as a chilled mirror One must also note the state of pressure compensation and turn it on or off as applicable to the reference The necessary steps are described below also refer to the Set Up State flow diagram in Appendix B a Make sure that the low attenuation and low dewpoint are correctly entered for this sensor b SpanCheck the sensor c Dry down the sensor for at least 12 hrs d Expose the sensor to the known dewpoint 25 C to 20 C for a sufficient time at least 30 min e Go to the CAL AD mode and press the UP button the display will show the current value in the range of 1 99 to 1 99 followed by blinking horizontal lines f Observe the display if the buttons are not being pressed the display will every few seconds show for a short duration the dewpoint as being computed at the moment utilizing the current cal adjust value in the computation g Use the UP o
46. e LCD dis play is not backlit but can still be easily and clearly read in an extremely dark room the back light may be momentarily turned on by pressing the TEST button However as long as an alarm condition exists the LCD will be backlit in red This lit up front window of the instru ment is the visual indicator 28 Section 3 Instrument e This configuration is also equipped with a NEMA sealed audio indicator gt 80dB 3ft mounted in the instrument enclosure It is activated when an alarm condition occurs it may be disabled by momentarily pressing the RESET button on the front panel When the alarm con dition ceases to exist the audio indicator is automatically re enabled ready to be activated on next alarm condition A momentary TEST button on the front panel allows testing both the visual and audible indi cators 3 6 Troubleshooting the Instrument This instrument performs diagnostic tests on power up as well as once every two minutes The table that follows depicts all possible error unexpected messages that may be displayed on the instrument For each message the table has explanations for the reason and if necessary a sug gested action to remedy it The instrument contains a fuse which may open if the instrument is subjected to voltages exceed ing the specifications Under these circumstances the unit display will be blank and the instrument will not draw any current when powered up The user may replace the fuse with a
47. e Use sufficient flow rates e g 1 l min with 6 feet of 1 8 piping is adequate The flow rate will influence the systems response time e Do not install any devices upstream of the sensor such as other measuring systems flow meters etc which are not absolutely necessary as these are potential leak sources e Installation of a coalescing and or particulate filter ahead of the sensor is desirable to prevent any liquid or particulate contamination of the sensor e If filters are used upstream of the sensor make sure these contain non hygroscopic filter mate rials only Refer to Sample Gas Filter Considerations Appendix H If pressure regulators shut off valves etc are used upstream of the sensor make sure these do not contain rubber or other hygroscopic materials 2 4 Mechanical Installation The sensor probe has two thread sizes for mounting to the sample cavity where the dewpoint will be measured see appendix C Various optional fittings are available for direct connection into existing system openings refer to appendix D Ask your representative for a Sample Cell if you do not have the ability to provide an appropriate sample cavity mounting If the x16 thread is used then the sensor will seal against the wall of the sample cell with the provided Viton A O ring If the 14mm x 1 25 spark plug thread is used then an additional Viton gasket must be installed to provide the proper seal Ask your representative for this gasket i
48. e View Set Gas Pressure sub state The display has the SET and PSI legends on and alternately shows GAS and the currently set value for the gas pressure The up down and pressure correct buttons operate in the same manner as in the Sensor Pressure sub state Pressing the Mode button changes the unit back to View Set Sensor Pressure sub state and so forth Notes 1 Instruments are shipped from the factory in the locked mode and must be unlocked before this procedure can take place see section 4 3 7 to unlock 2 The factory default settings are 14 7psi for both sensor and gas pressure and pressure correction disabled 3 When Pressure correction is disabled all dewpoints are computed by assuming that both Sensor and Gas Pressures are 14 7psi 4 Pressure correction will effect the analog output but not the alarm relay trip points The analog output will track the pressure corrected dewpoint the relays will trip on the uncorrected dewpoints Section 3 Instrument 3 4 4 2 Alarms There are two independent optional alarms they are named HI and LO alarms Each alarm can activate a single pole double throw relay rated at 10A 250VAC or 30V DC per contact Instru ments for use in Division 2 Hazardous Areas have hermetically sealed relays rated at 3A 125VAC Specially ordered instruments may have a third alarm refer to the supplied addendum for relay contact rating pinouts and user interface issues The alarms can be set with
49. e damaged Spare parts may be ordered through your representative 31 XDT User s Manual 32 control drawing Glossary Glossary range of current for the current loop OmA minimum reading 24mA maximum reading range of current for the current loop 4mA minimum reading 20mA maximum reading preferred because less than 4mA can indicate a fault or open circuit also there is at least 4mA available to power equipment type of display configuration where 7 segments can be used to form the numbers 0 through 9 and most letters analog to digital a device or circuit that converts an analog voltage to a digital number retention by penetration into bulk of material retention as a surface layer on a material quantification of the magnitude of error of a measurement or degree of conformity with a standard aluminum oxide the decrease in intensity of a signal as a result of absorption of energy measured in decibels dB American Wire Gauge size of the wire cross section area of the wire Bits per second of data transfer over the serial interface Binary digit s ones and zeros a connector type used with coaxial cables sensor mounting in a slip stream of sample which feeds back into the process stream Conformit e Europeane symbol affixed to a product indicating its conformance with directives issued by the European Community EC Comit Europeen de Normalisation Electrotechnique European Committee for El
50. e pressure at which the dewpoint is to be calcu lated Pressure Correction is used in the context that the values displayed signify the moisture content at some pressure we refer to this as the Gas Pressure different from the pressure at the sensor Note that PPM LBS and G M readings are by definition unaffected by pressure correction because only the pressure at the sensor affects their value While C and F are affected by pres sure correction by reporting what the dewpoint would be at the Gas Pressure when the dewpoint is what is measured at the pressure at the sensor However this also implies that whether pressure correction is applied or not the PPM LBS and G M readings are affected by the setting of the Sensor pressure A long press of the Pressure Correct button while in the pressure correct mode flashing PSI leg end changes the unit to the View Set Sensor Pressure sub state The display has the SET and PSI legends on and alternately shows SENand the currently set value for the sensor pressure The up and down buttons allow the user to modify the sensor pressure while a short press of the pressure correct button toggles the Sensor Pressure setting between whatever value is on the dis play and 14 7 psi this is a quick way to go back to atmospheric settings A long press of the pressure correct button changes the unit back to the Viewing Dewpoint Mode Pressing the Mode button changes the unit to th
51. ectrotechnical Standardization amongst many others has set standards for intrinsic safety an arithmetic total on a set of data e g the data in the instrument s memory is summed and compared to a previously stored sum to check for corrupted data formation of liquids in gas samples or separation and collection for disposal of liquids from gas samples schematics and system drawing of hazardous area approved appara tus with control number issued by approval agency Canadian Standards Association Clear To Send a label for a RS232 interface control line indicates UL evaluation of a product to Canadian safety require ments a circuit where the variation in the current flow is used to indicate the value of a measurement from the instrument only 2 wires are 33 XDT User s Manual desiccant desorption dewpoint dewpoint demand mode dielectric constant Division 2 Hazardous Areas DIR sige teaser electromagnetic compatibility hygrometer hygroscopic hysteresis IGT Research Bulletin 8 used for the circuit see 4 20 see decibel a style and size of connector in this case with 25 pins a style and size of connector in this case with 9 pins a dimensionless unit representing the logarithm of the ratio of two values independent test laboratory and the European National Certification Body for Denmark f
52. ed out before a calibration is performed Symptoms of these conditions are a sensor that will not go through the SpanCheckTM function to the ENDdisplay or a sensor that will not dry down after cal ibration To dry install sensor in either a known dry gas stream i e instrument quality air or dry nitrogen or place sensor in a dry can or bottle of desiccant and seal the container from outside air the shipping container is designed for this purpose After a minimum dry out period of 24 hours proceed with the calibration procedure of your choice SpanCheck calibrates sensors by using micro climates Please contact your representative if you have any questions about how to create such micro climates A perfectly acceptable and accurate for calibration micro climate may be created for the XTR100 and XTR65 sensors by cupping the sensor in the palm of one s hand during the SpanCheck pro cedure Remember that the micro climate does not have to be accurate it just has to be higher than the designed saturation level The dewpoint of the micro climate within the fingers is usually higher than the dewpoint of the room air and probably well above the 20 C upper range of the sensor On a dry day one may need to exhale in the hand before cupping the sensor to guarantee a high dewpoint The sensor should be warmed up close to body temperature before performing this procedure Care must be taken that the sensor temperature is not below the temperature of t
53. ee eaae display alternate units s display CONVENTIONS asa sissasasssvai DOWN button iainiaaiaiaaiassasssasasasasanai E electrical connections 4 10 electromagnetic compatibility 9 EMC ta aia di enclosure enclosure dimensions engineering Units aaiaisisasssasasaai environmental seal error MESSAGES mmmmrerrerrerserserserserse exchanging Sensors aianaaisasasasssssassasani 55 explosive gases extractive installation a sasa aaa 6 F face Pl te banan inedito 17 fail safe operation seses 14 failures u 8 29 fa lts uti 8 29 features amp capabilities owe 1 O ER 7 filter considerations 48 FITNESS Gavin 7 flammable gases aaaaiaaaaaasavsssssssssasasanana 3 flow diagram operating State aiaiaiaiaissssssssasasasai 37 Self calibration coccion 38 set up State aaaaasaaanianianianasnannnnnnnianin 39 flow meters flow range flowrate latin front panel S Uta G GM a 17 gas pressure coccnncccononnnonnnnnoninenanananeninono 18 gases COMTOSIVE DRA 3 incompatible a aiasaiaaaasasas sassssssssanaa 3 gasket cnc 2 7 11 glove 010 GJ 5 SIYCOL tantas 20 grams per cubic meter 17 ground loops 49 grounding considerations 49 H harsh applications 00 0 20 Hazardous Areas eN HCL
54. ent point of the process then an extreme accuracy of the process may be maintained even in the most harsh of applications In general we recommend to perform SpanCheck in 12 month intervals not more often and sin gle point calibration as often as practically possible When it is time to perform both calibrations then first disable the single point calibration then perform the SpanCheck calibration then per form the single point calibration This procedure is not necessary but it is preferred when both cal ibration are performed 20 Section 3 Instrument 3 4 4 3 1 SpanCheck Mode The instrument is calibrated at the factory with the sensor it is shipped with and does not need to be re calibrated prior to installation Instrument calibration is recommended in approximately 12 month intervals and the XTR65W sensor should be re calibrated after prolonged exposure to liquid water Simply follow steps 1 7 of the procedure below removing the sensor from the sample gas stream To avoid injury make sure the gas stream is depressurized before removing the sensor It is recommended to keep the sensor exposure to room air as short as possible in order to avoid super saturation of the sensor While super saturation is not damaging to the sensor it will prolong the initial dry down time after you install the sensor in the sample stream Therefore remove the sensor from the packaging container only after you are ready to proceed with the c
55. er clip etc do not attempt to short at the instrument screw terminals as this approach will not account for the cable resistance c Go to the CNF CBL OPN Confirm Cable Open mode d Leave the BNC connector open and press the UP key The instrument will show OPNand beep for a few seconds Then it will show CNF CBL SHR Confirm Cable Short e Short the BNC connector and press the UP key the unit will show SHR and beep for a few seconds Then it will show CNF CBL OPN again f Leave the BNC connector open again and press the UP button The instrument will show OPNand beep for a few seconds Then it will show END The compensation data will be retained even if power is turned off 3 5 Resetable Audio Visual Alarm Option NFPA compliant When the instrument is ordered with an Audio Visual Alarm option it is provided in the XDT NEMA enclosure outfitted with two front panel momentary push buttons in NEMA sealed rubber boots The instrument complies with the recommendations of NFPA 99 1996 edition e The alarm set point is programmed on a third alarm hence the HI and LO alarm relays are free to be used for additional purposes The third alarm is properly configured to 39 F at the fac tory but when necessary may be modified by the user Refer to the notes following HI amp LO Alarms in the Flow Diagram of Operating State User Interface in appendix A e The visual indicator is the display backlight When there is no alarm condition th
56. essure for the following reasons e The readings will not be affected by variations in line pressure e The risk of exposing the sensor to liquid water is significantly reduced e ppm readings are computed for a pressure of one atmosphere 1 bar and have to be corrected using software in the instrument or a pressure monograph or calculator if the sensor is mea suring at different pressures If readings at line pressure are necessary it is recommended to measure at ambient pressure and to use the instrument s pressure compensation feature to calculate the dewpoint at line pressure Refer to Viewing Dewpoint Mode section 3 4 4 1 Please make sure that e The sample is taken from the upper surface of the main gas line This avoids problems with contamination The sample should be taken away from pipe line walls where flow rates may be low and dewpoint changes may lag e For dewpoints dryer than 40 F use stainless steel tubing only For dewpoints 40 F and wet ter copper tubing is acceptable Do not use plastic rubber or tygon tubing under any circum stances as measurements would be incorrect and or response time slow due to water retention Section 2 Sensor and Sampling Techniques inside these materials e Try to run pipes to the sensor upwards so that contaminants tend to fall back into the main line Keep the length of the sample line to the sensor as short as possible e Use small diameter pipes 1 4 or 1 8 OD
57. fer ence gas is provided from a compressed gas bottle make sure that there is sufficient pressure in the bottle for some bottles there is a cut off pressure below which the dewpoint is not guar anteed Make a note of the exact dewpoint of the reference gas as it will be required in the next steps Refer to the unshaded area of the flow diagram on the second page of Appendix A Make sure the instrument is unlocked Press the MODE button a few times until the display shows CAL Press the DOWN button to select the Self Calibration mode The display will show SLF CAL Press the UP button to confirm entry into the Self Calibration mode The display will show the reference dewpoint which has been previously programed into the instrument the SET and 23 XDT User s Manual DEWPOINT legends will also appear Use the UP and DOWN buttons to modify this dew point to match the dewpoint of the reference gas Press the MODE button the display will alternately show 720 HRS INTR indicating that the calibrations are scheduled at 720 hours interval Use the UP and DOWN buttons to change the interval time to whatever is determined to be most effective for your application consult with your representative if you are in doubt An interval of O Hrs appears as a blank on the display disables any further scheduled unattended calibrations however the instrument will continue to make use of calibration values acquired previously or manually in the future
58. fibers then there will be a delay intro duced in the measurement 48 XDT User s Manual Appendices Appendix I XDT Grounding Considerations Pluggable Block Terminals ee Se Re Bt al 05A 250V1 1 ACLIVE 4 3mH AA 0 1uf _ ka i FAT from 2 AC NEUTRAL Facility 1o 0047ut _ 20 0047uf H 3 Not Connected AC Power 4 AC GROUND Q Sataa Pass 5 SIG IN Power Supply Module white Sensor he Measuring if Circuitry Analog Output 4 20mA 8 A RET Chart recorder A D converter etc I AC GROUND Logic ground and AC 14 Not Connected A 8 Power ground ae i 2 i 1 connected for safe and gleciromagneti 15 NC o P interference pp aS ction cour oe considerations 16 NO J J fe t L n through equipment ground CP O Bl IR993510 eee eee 7 LO 0 RS232U0 AARP 17 C I y 18 Not Connected gy ALARMS Possible Earth Ground at terminating equipment Ro 19 NC Ti Rye d HI i 20 NO a Ke ACE a eee Instrument Circuit board 1 The sensor ground is isolated from the signal and frame grounds however it is shunted to frame ground with a 33V Transient Voltage Suppressor IM Ohm resistor and 0 1uF capacitor to prevent electrostatic buildup and noise pickup When the sensor is connected to equipment which is grounded to earth ground because of pipes etc there is no ground loop because the sensor is not connected to the earth
59. ge or user selectable 4 20 0 24 mA Includes installation testing features User selectable range low amp high point of analog output e RS 232C interface allowing the user digital data access to the instrument e Interval timer scheduled Self Calibration a single point calibration using a known standard gas can operate an electrically actuated switchover valve for unattended calibrations e Large variety of threads for sensor mounting into sample Low voltage DC power operation 15 30VDC e Intrinsically Safe Approved NEC and CENELEC standards UL amp DEMKO configurations XDT User s Manual Section 2 Sensor and Sampling Techniques 2 Sensor and Sampling Techniques 2 1 Precautions using the sensor The Xentaur HTF A1 03 sensor is designed and field proven to be highly reliable rugged and maintenance free However the user should consider the following precautions If the instrument is used to measure moisture in toxic flammable or explosive gases the sam ple outlet must exhaust to a safe place Check the sample line for leaks before and after connecting If measuring gases at high pressures make sure the sample system is depressurized before installing or removing the sensor probe or other items e g filters To avoid the need for prolonged dry down when expecting to measure dewpoints dryer than 65 C do not expose the sensor to room air longer than necessary 1 2 minutes Thus do not open the sens
60. ground on the circuit board The optional Analog Output and RS 232 Output are both referenced to the circuit board logic ground which is jumpered at a single point to the AC power ground Therefore if these out puts are connected to equipment which connects the signal grounds to earth ground this is a common occurrence in PC s then a ground loop may be formed This can be best avoided by removing the signal to earth ground connection at the termination equipment if that is not possible then the AC power ground connection to XDT logic ground may be removed but this may cause a EMI problem Please consult with your representative for information on optional isolated analog and RS 232 outputs Keep in mind that in general a ground loop on a digital line such as RS 232 will not cause problems The Earth Safety Ground AC GROUND at pin 4 should not be omitted since the RFI filter capacitors will cause half the line voltage to develop at the instrument s ground This may have safety and EMI implications When installing DC powered instruments 15 to 30VDC at pins 12 and 11 similar condi tions may exist if the DC power source is earth grounded 49 XDT User s Manual Appendices Appendix J Analog Output vs Dewpoint The current output of the XDT varies with the measured dewpoint To use the current to calcu late the value of the dewpoint measurement one must know the settings of the low and high ends of the analog output range then
61. h the MODE button until the instrument goes to the dewpoint display mode 10 If it is desired to prevent inadvertent alarm settings changes by unauthorized people acti vate the Lockout The Alarm Relays switch on non pressure corrected dewpoints Thus enabling or disabling the pressure correction wil not effect the relays The instrument will retain the alarm settings even if the power is turned off Pressing the MODE button changes to the Start Calibration Mode 3 4 4 3 Start Calibration The instrument is calibrated at the factory with the sensor it is shipped with and does not need to be re calibrated prior to installation The calibration mode allows two different types of calibrations e SpanCheck an Automatic Calibration using the sensor s ability to saturate thus no addi tional materials or equipment are required this calibration is most useful after long periods of usage and a suspicion of performance degradation e Single point calibration the calibration curve derived from SpanCheck is modified at a single point using the output of the sensor as it is exposed to a gas with a known dewpoint This cal ibration is most useful when the sensor is exposed to hygroscopic substances which constantly alter the equilibrium between the sensor and the gas being measured e g glycol or when the sensor is exposed to corrosive gasses and may drift If the known gas is chosen to be at a dew point at or close to the critical measurem
62. he Set low dewpoint mode The display will show the cur rently entered low dewpoint Use the UP or DOWN keys to select the value which appears on the shipping container label 5 Press the MODE key to go to the Calibration Midrange Adjust mode The display will alternately show CAL and AD Press the UP key once to see the entered calibration adjustment value The display will alternately show the currently entered value and the dewpoint being measured when showing the Cal Adj value the number in the range of 2 0 to 2 0 will be followed by a blinking X and when showing the dewpoint the display will have the appro priate legend e g C Use the UP or DOWN keys to select the value which appears on the shipping container label 6 Press the MODE key five 5 times to go to the Lock or Unlock mode The display will alternately show UNand LOC Press the DOWN key to lock the instrument The display will alternately show only LOCThis prevents inadvertent changes 7 Press the MODE key once 8 Now the instrument has stored in it s EEPROM the calibration values associated with the new sensor HOWEVER NOTE THAT IT IS STILL NOT CALIBRATED The instrument may now be reset 9 Perform the SpanCheck Procedure in section 3 4 4 3 1 10 Install the sensor in the sample system and measure If for some reason the Cal Adj value must be re entered or modified to improve accuracy the unit does not have to be SpanChecked again 55
63. he hand as in such case condensation could occur and super saturate the sensor For the same reason avoid exhaling directly onto the sensor 3 4 4 3 2 Single Point Self Calibration manual or scheduled The instrument is calibrated at the factory with the sensor it is shipped with and does not need to be re calibrated prior to installation Single point calibrations should be performed whenever the measurement is in question or on a scheduled basis depending on the application Consult with your representative to establish crite ria for specific applications The single point calibration is performed on the premise that the sensor is exposed to a gas with a known dewpoint for a time sufficient to equilibrate Then the sensor output is measured and the calibration curve is adjusted to provide measurement computations which correspond to the known dewpoint Measurements over the full sensor range are linearly adjusted to this known point The single point calibration provided by this instrument may be performed manually or when a sample system is ordered equipped with an electrically actuated switchover valve unattended on a repetitive timer scheduled basis The user interface for both is the same with additional steps for interval setting and automatic stabilization time outs for the instrument with the electrically actu ated valve Manual Single Point Self Calibration procedure for instruments without electrically actu ated switchover v
64. her New calibration A to RESET the values are saved Onore emon instrument Legend A slash in the display area is used to depict two alternately shown flashing back and forth messages e denotes beeping Buttons without designator or arrow leading out perform no function J 38 MEE Displayed only if Analog Output option is installed XDT User s Manual Appendices Appendix B Flow Diagram of Set Up State User Interface PoworUpwith I r appears when changin 4 min anywhere without go to Lol PP ging vara MODE settings of locked unit key press perating key depressed State Choose alternate units to show when displaying dewpoint blank F C ppm LBS G m3 PSF CF Temp Temp C Factory default is blank there is no alternate display _ 2 Choose sensor type Iti t db XTR 100 XTR 65 attenuation of sensor Set measured attenuation at a known low dewpoint 8 0 Set low dewpoint for above attenuation B s changes by 0 1 C if no buttons pressed for 3 seconds shows the dempeint tobe moment Calibration Midrange Adjust CAUTION These are set properly at the factory with the shipped sensor Do not modify these settings unless you are changing the sensor changes by 0 01 units R 0 5SPn D H or 4 20 Select Span of Analog output 0 to 24mA or 4 to 20mA Pr Zera Test Analog Output by forcing it to high low or midpoint g B g E G if Spa
65. ibes the instrument s electrical mechanical and user interfaces This manual is intended for those already familiar with the installation use and maintenance of analytical or process instrumentation Those acquainted with other Xentaur dewpoint measurement products such as the LPDT or the XPDM will benefit from the commonality of the user interface Warning Labels The symbols shown below appear on the instrument to alert the user of potentially hazardous conditions Protective Grounding Conductor Terminal Bornier de L Ecran de Protection Schutzerde CAUTION Risk of Electric Shock ATTENTION Risque de D charge lectrique ACHTUNG Hochspannung Lebensgefahr CAUTION Refer to documentation ATTENTION Se R ferer aux Documents Joints ACHTUNG Beachten Sie beiliegende Dokumente 111 XDT User s Manual Warranty This instrument is warranted to be free from defects in workmanship and materials Liability under this warranty is limited to servicing calibrating and replacing any defective parts of the instrument returned to the factory for that purpose Fuses are specifically excluded from any liability This warranty is effective from the date of delivery to the original purchaser The equipment must be determined by Xentaur to have been defective for the warranty to be valid This warranty applies as follows e One year for electronics e one year for mechanical failures to the sensor e six months for calibrations If d
66. ibility accredited laboratory tested and certified UL and cUL for ordinary use Intrinsically Safe configurations for NEC standard IS Simple Apparatus UL for CENELEC standard IS Simple Apparatus DEMKO refer to labeling 2 3 Sensor Installation amp Sampling Techniques Keep in mind that the moisture content at the sensor is not only due to the moisture of the gas being measured but also due to desorption of water from tubing trapped moisture at the inter connection points valves filters and other hygroscopic materials in the system leaks in the sys tem and others Thus the measurement may vary from the expectation and therefore care should be taken in choosing the sampling technique utilized in the measurement Factors such as gas pressure flow rate materials of construction length and diameter of tubing number of intercon necting fittings dead space in tubing and manifolds will influence the measurement value and response time The high capacitance HTF sensors can be installed either directly in the line to be sampled in situ or in a slip stream of a sample system extractive To assure a long and accurate performance of the sensor it should be protected from contaminants such as liquids water oil etc and particulates The sintered stainless steel sensor encapsulation protects from particulates larger than 100 microns finer particulates e g from degraded desic cant or rust should be filtered with a particula
67. ing a new calibration or replacement or repair of the instrument or sensor at Xentaur s sole option as covered by Xentaur s warranty In no event shall Xentaur be liable for any incidental consequential or special damages of any kind or nature whatsoever including but not limited to lost profits arising from or in any way connected with this instru ment or items hereunder whether alleged to arise from breach of contract express or implied warranty or in tort including without limitation negligence failure to warn or strict liability Swagelok Cajon are trademarks of SWAGELOK Co Acrobat is a trademark of Adobe Systems Incorporated Epson is a registered trademark of Seiko Epson Corporation Microsoft Windows is a registered trademark of Microsoft Corporation HTF is a trademark of Xentaur Corporation SpanCheck is a trademark of Xentaur Corporation The Xentaur Logo is a trademark of Xentaur Corporation ii XDT User s Manual Examine the XDT package for damage or mishandling If any damage is evident notify the carrier and request an inspection Unpack the box it should contain The XDT sensor in desiccant container connec torized cable and this manual PLEASE READ THIS MANUAL IN WHOLE PRIOR TO INSTALLING OR REMOVING THE SENSOR FROM ITS SHIPPING CONTAINER This manual is organized in three sections Section 1 is an overview of the XDT Section 2 describes the sensor and sampling techniques Section 3 descr
68. instrument serial number Who Command send WH O JSg receive Dev gt pType XDT SpVer n n R F where n n is the instrument software version Reset Command send R ESET Ppy k the unit will perform power on reset Login Command send L OGIN R receive Level 05 54 XDT User s Manual Appendices Appendix L Procedure for Exchanging XDT Sensors To exchange sensors one must know the measured low attenuation of the sensor at some low dew point as well as the calibration adjustment value These numbers can be found on the shipping container serial number label Through the following steps it is helpful to refer to Appendix A Flow Diagram of XDT Set Up State User Interface 1 Power up or reset the XDT while holding down the MODE key in order to enter the Set Up state Make sure that the instrument in unlocked refer to section 3 4 5 10 2 Press the MODE key to go to the Choose Sensor Type mode Make sure that the proper sensor type is chosen e g XT1 for XTR 100 or XT6 for XTR 65 3 Press the MODE key to go to the Set Measured Attenuation low dewpoint mode The display will show the currently entered attenuation in decibels dB this is indicated by hav ing both the C and F on the display Use the UP or DOWN keys to select the value which appears on the shipping container label Note that this value is a negative number typically in the range of 18 0DB to 14 0DB 4 Press the MODE key to go to t
69. is on pin 8 it is labeled A RET The ground of the Analog Output is connected to the frame AC power ground but it is isolated from the sensor ground see section 3 1 1 Instruments ordered with Voltage output are configured at the factory with appropriate resistors across the current loop output such that when operated in the 0 24mA mode they produce the desired voltage The current loop is capable of driving loads from OQ to 5002 and the user may select to operate it as 0 24mA or as 4 20mA refer to 3 4 5 6 The output is linearly proportional to the selected engineering units The output may be scaled such that 1t spans only a portion of the full range of the sensor this feature may be useful in cases where a higher resolution output is required over a narrow dewpoint range or vise versa To verify or change the current loop configuration and scal ing follow the instructions in the set up mode section 3 4 5 6 7 8 amp 9 After hooking up the current loop output it can be forced to its low mid and high points by fol lowing the instructions in section 3 4 5 7 This procedure may be helpful in testing the connec tion and setting up the termination equipment Section 3 Instrument 3 3 2 5 Interfacing to the RS 232 option The optional RS 232C interface is provided on the P1 connector The configuration is 9600 baud Even Parity 8 Bits 1 Stop all received characters are echoed The ground of the RS 232C inter face is connected
70. lders for choices are labeled with lowercase italic letters with the allowed characters shown below nn denotes a numeric value Bytes which are not characters are shown with diagonally placed mnemonics for example Escape is depicted as Esc this signifies a single byte hex 1B Optional characters or command argu ments are encompassed with brackets The commands may be sent in either upper or lower case Arguments may be delimited with space or comma HELP command Lists all of the available commands send H ELP k receive Help Data SNF Who Reset Login g r DATA command Selects the reporting format of the current measurement This formatting will be retained until the next DATA command even if the power is turned off send DA TA units interval mode Cr nn N G CDAZ T77T7A The units argument selects the units in which the measurement will be reported C F P L amp G select the dewpoint in C F ppm Lbs H 0 mmscf and gm m respectively D selects decibels which is the measured sensor attenuation U selects using whatever units are selected by the user on the display The interval argument is optional if it is not entered then the measurement will be reported only on a query with the command However if it is desired for the unit to report the measurement on a regular interval without a query then an interval in seconds may be specified in the range I to 255 seconds This feature allows the user to l
71. ly saturated in the pores of the Aluminum Oxide This upper end is an excellent indication of the total pore volume while the lower end of the curve is an indication of the distance between amp area of the capacitor plates electrodes this is the intrinsic capacitance of the sensor Therefore knowing these two points a sensor can be cali brated with compensation for small manufacturing deviations As the sensor is used in real world applications it is exposed to various elements and stress like any other sen lod Gapaclancs demi of Aged Sensai sorit may over time drift from calibra i tion However one must note that the intrinsic capacitance will not change with use because it is based simply on the dielectric constant of A1203 and the distance between amp area of the plates electrodes thus the original factory measured values will always be valid E _Dry Capacitance Asymtote of New amp Aged Sensor What may change 1s the pore volume 80 60 40 20 0 20 due to clogging with contaminants EEE residual oxidation metal migration etc Thus to re calibrate the sensor the instrument needs only to know the capacitance at the wet end of the curve As discussed previ ously the capacitance at the wet end approaches asymptotically a saturated pore capacitance therefore if the sensor is saturated the exact water content will not be important since the curve is asymptotic then the instrument can measure the capacitance
72. n The display will show SLF CAL 41 5 indicating that self calibration has started and it is measuring a dewpoint of 41 5 C this is also the entry place into the procedure when the scheduled time elapses Now the instrument will freeze the analog output and the alarm relays so that they are not influenced by the ref erence gas dewpoint Then the instrument will activate the electrically actuated switchover valve and thus introduce the reference gas to the sensor and initiate a 15 minute time out allowing the system to reach equilibrium Since the program will perform the above when the scheduled interval elapses this step may be occurring in an unattended mode thus the refer ence gas bottle and regulator must be left in the open positions the switchover valve will keep them from being exhausted e After the 15 minute stabilization time out the display will show alternately S C STB 41 5 indicating that Self Cal Stabilization is being checked and currently the instrument is measur ing 41 5 C When the measured dewpoint is stable within 0 5 C for 3 minutes the instrument will record the new single point self calibration values Note that the program will spend at least 3 minutes on this stage of the calibration e The electrically actuated switchover valve will be deactivated thus introducing the sample gas to the sensor and the dewpoint will be monitored for stability The display will show S C FIN 42 indicating that self
73. n is 4 to 20 Hi 20mA Lo 4mA Mid 12mA Circuit Open Set dewpoint corresponding to low end of analog output Factory default is low range of sensor e g 100 C for XTR 100 Set dewpoint corresponding to high end of analog output Factory default is high range of sensor e g 20 C for XTR 100 Lock or unlock the instrument Resets the When locked instrument parameters can not be changed instrument Factory default is locked Cable Length Compensation e e SET SET CaF Cbl oPn CAF CbL SHr CaF Cbl oPn S660 EIS EEIN REF WELEI Open cable at BNC connector Short cable at BNC connector Open cable at BNC connector Legend A slash in the display area is used to depict two alternately shown flashing back and forth messages e denotes beeping Buttons without designator or arrow leading out perform no function 39 XDT User s Manual Appendices Appendix C Sensor Mechanical pes for 1 4 wrench C oS 5 Q Oo U Bc h o 6 EO 2 9 Q 20 8 32 g o o Zz m D E VIII 2 Ss a o 5 n ry a I HE g gt 2 v 2 a y O FEET EE Ko ER SR 20 e YN OS en 22 KG ee oF Doe Be T EEE ere ee Coes coe OX a o S SUE I N B ER i Se iS E x pea saca 2 E 0 oO Se Oks gat S E ss a Y 3 HERR Ss gt SO gt E He ess OS 5 I SR lt S ERB K o ee o e ee ei Ki 3 min jp _ a y gt
74. nding upon whether the con dition is approached from above or below the value of interest pur posefully programmed into control systems with relays to avoid chatter Institute of Gas Technology has developed Charts of the Equilib rium Moisture Content of Natural Gases in the Range of 40 F to 250 F and 14 7 to 5000 psi 34 in hand micro climate intrinsically safe LBS H O mmscf National Electrical Code pounds of water per million standard cubic feet regenerative dryer purge response time Glossary the ratio of voltage to current at a specified frequency measured in Ohms a resistor of the same value would act the same as the mea sured circuit the warm and moist climate created when cupping the sensor in ones hand measurement with sensor located in the process stream incapable of releasing enough electrical or thermal energy to cause the ignition of flammable substances listed for a hazardous area classification see pounds of water per million standard cubic feet Liquid Crystal Display a display that uses a special material that is sensitive to electrical voltages to affect the transmission or reflection of light a systematic learned exposition of a subject e g a chart represent ing dewpoint conversions for differing pressures a set of US standards related to accepted practices for electrical wir ing National Fire Protection Agency issuer of the National Electrical Code NEC
75. ngs In general if the dewpoint is monitored in C or F there is no need to change the factory default 50 XDT User s Manual Appendices 100 C to 20 C settings because the 4 20mA provides sufficient resolution to measure the out put better than the specified accuracy of the sensor Relationship of 4 20mA output and instrument reading in ppmV or LBS Instrument reading in ppmV 10 100 1000 10000 20mA gt 5 N 3 w 12mA E E 3 D E I K l 8mA 2 8 o o O o I I N EN gt o 2 3 EVE Q F ho S 5mA 3 w 3 ke op 3 5 lt I lt 4 5mA 3 II wW amp o w T 3 2 4 1mA 0 1 1 10 100 1000 Instrument reading in LBS of H20 million cubic feet 51 XDT User s Manual Appendices Appendix K RS 232C Interface Protocol The instrument uses a simple protocol to communicate to a host computer through its RS 232C interface see section 3 3 2 5 for electrical connections The interface is configured as 9600 baud Even Parity 8 Bits 1 Stop and it echoes all received characters To illustrate the protocol the following notation conventions are used in this section The characters sent or received are depicted in bold Send refers to sending from the host com puter to the XDT Receive refers to receiving from the XDT into the host computer The com mands and arguments are shown in capital letters while place ho
76. nj 1 uU 18 Signal cable ion domain 4 theory of operation 1 45 types oreas sirere 26 Serial number iii 1 25 Setting alarms aiaiaiaiainaaasasasasanasniasnineni 19 setup state s set up state flow diagram 39 shipping container 2aaaaaasasasassssssssasena 3 shock shutoff Valve uri signal cable sensor oo eeeeeeeeeeeeeeeeeeee single point calibration aK VOV id SPanCheck sc cseicenvescesecseesteeteseesvesies Spare Parts viaria iid ees specifications instrument aiaiaaiaiaiaininiaiaasanananasanainia 10 sensor standard features capabilities 1 Static electricity orenen sarei 9 SWItCHES inne nk 16 T technical specifications instrument dico iii 10 SETISOE dt 4 temperature instrument operating ee 10 instrument storage sensor operating aiaiaaaiaiaiaisisanssasasanai SENSOL SLOTAYO coococncccnnnncononononananononaninos terminal block testing analog output thread SIZES rematada toxic transient voltage suppressor 9 troubleshooting instrument N 29 SOMO iento iris 8 O OS 6 tygon tubing sassbsllsiV sklustktal 6 U UL A ea 4 9 10 13 uncertainty in LBS ppmV calculations 56 units of measurement 10 unlock instrument a aaavasasassasasair 27 OP Dutton AA l atla 16 V valve shut Off miccional 7 VIDrati i veian id 3 9 voltage output range Setting aaaiaiaassasassssasasanaa 27 WINN
77. nse time they can expect out of a sensor As can be seen from the graph the Xentaur sensor is appreciably faster than any competitors This is due to the Hyper Thin Film HTF technology an explanation of the workings of the sensor is provided in the Xentaur Hyper Thin Film HTF Aluminum Oxide Technology notes We can comfortably make the claim that the Xentaur XTR 100 sensor is faster than any on the market today To compensate for their sensors slow response some manufacturers resort to software accelera tion of response time even though this scheme provides a seemingly faster response to a single step change it creates great errors in real systems where multiple changes occur consecutively in differing directions The sensors real response lag to consecutive step changes in differing direc tions is erroneously interpreted as belonging to a single step change and thus large errors of mea surement are introduced for long periods of time An analogy of this situation can be imagined with a defender in a football soccer game A slow player cannot defend by just anticipating the next move of the forward wing he will simply be faked out by a series of back and forth maneu vers consecutive step changes in differing directions While a fast defender cannot be faked out he simply follows the forward wing as fast as he moves Hyper Thin Film 47 XDT User s Manual Appendices Appendix H Sample Gas Filter Considerations Sample treatmen
78. nywhere other than I r appears when changing and sign on message Calibration without key press LOL settings of locked unit 4 Toggle Pressure Correction 1 2 sec 650 vewronr ar Viewing Dewpoint Flashing PSI indicates pressure corrected coe SHORT PRESS LONG PRESS AND PSI MODE relays not energized Flashing HI and or LO indicates corresponding Toggle 14 7 psi Set activity options p FA Sensor Pressure SHORT PRESS LONG PRESS p 2 4 Toggle 14 7 psi Set hysteresis GAS vatue View Set gt Gas Pressure SHORT PRESS Values LONG PRESS values Set trigger dewpoint Set activity options Relay polarity R energize relay above trigger dewpoint b energize relay below trigger dewpoint appropriate polarity selection in conjunction with proper wiring wil pees fail safe operation Set trigger dewpoint En bii EL A F lt Scroll through Alarm activity options Displayed only if alarm options are installed Setting LO Alarm Relay 2 MN ETT HI Alarm Relay 1 EE n faults do Not effect relays H faults look like High dewpoint L faults look like Low dewpoint F faults Flash the relay Set hysteresis values When a third Alarm Relay is installed setup menu options will appear here similar to Relays 1 amp 2 but with both the HI amp LO legends active This is also the dewpoint alarm for units with resetable Audio Visual Alarm
79. og the measurement on a dumb terminal or a printer 52 XDT User s Manual Appendices The mode argument is optional and may be specified only if an interval was specified It may be N for numeric reporting or G for graphic reporting of the measurement The mode argument defaults to numeric mode The graphic mode may be chosen only for C or F it will plot a graph of the measurement on printers which can respond to the Epson Graphic Commands and have at least 80 character columns In the NUMERIC mode the instrument will report the ee in the following format B Measurement Units gt pElapsed T ime gt pAlarm Status K The bell character is used to denote the beginning of each line The measurement is a floating point decimal number The units are the appropriate character string degF degC ppmV LbsH20 mmscef or g m3 The elapsed time since the unit was powered up with 24hr roll over is in HH MM SS format The alarm status appears only if alarms are installed it is indicated with a character string HiAlrm or LoAlrm or NoAlrm If an error condition exists then the report will have the following format LP LErrorStringS RYE The ErrorString may be one of the following Error SensOpen or Error SensShort or Error SensSat In the GRAPHIC mode the instrument will transmit Epson Graphic Command compatible data strings at the selected interval Each string has the following format
80. or container before you are ready to install the sensor The sensor container has desiccant to keep the sensor dry during shipping and to avoid dam age due to condensation Close the container immediately after removing the sensor to avoid degradation of the desiccant Do not throw away the sensor container you may use it again to transport the sensor between locations to store it between uses or to ship it back to the factory for certification The con tainer can be attached to the sensor cable by trapping the cable with the lid strap Do not expose the sensor to corrosive gases such as gases containing chlorine ammonia or HCI SO can be monitored when the moisture content is low Except for the XTR65W sensor 1 Do not expose the sensor to liquid water as it may get damaged 2 Do not breathe directly onto the sensor as condensation may form which could damage the sensor element Do not install the sensor near heat sources such as radiators or air ducts Do not install the sensor in places subject to extreme mechanical vibration or shock If this is not avoidable use resilient mounting If in doubt call your representative Do not disassemble the porous metal filter encapsulation as this will damage the sensor and void your factory warranty Prior to installation of the probe ensure that no contaminants are present in the system e g oil liquid water XDT User s Manual 2 2 Sensor Technical Specifications A ur Hyper Thin Film H
81. or the safety testing of electrical products drying agent usually made from molecular sieve silica gel or acti vated alumina release of a previously absorbed or adsorbed substance saturation temperature of a gas in regards to another gas scheme to control the switching between the desiccant towers of a dryer based on the actual dewpoint measure of the ability of a material to hold an electric charge when placed between two metal plates most commonly measured rela tive to that of free space see Division 2 Hazardous Areas areas classified as hazardous under abnormal conditions 0 1 10 hrs year Data Set Ready a label for a RS232 interface control line Data Terminal Ready a label for a RS232 control line Electrically Erasable Programmable Read Only Memory a device that can remember information even when it has no power applied to it compatibility with directives issued under CE or with FCC stan dards concerning electromagnetic interference Electro Magnetic Interference external electrical or magnetic sig nals from natural or man made sources that can interfere with a device see grams per cubic meter the mass of water vapor present in unit volume of moist air at stan dard temperature and pressure Hyper Thin Film aluminum oxide sensor technology developed by Xentaur Corp device measuring the amount of water present in a sample property of attracting water or water vapor lagging in effect behind it s cause depe
82. put The factory default values are low end at 100 C and high end at 20 C For detailed discussion of the necessary considerations when choosing the ana log output range refer to appendix J 10 Lock Unlock the instrument with optional SECURED password protection The Lock Unlock feature of the instrument allows the owner to block access to parameter set tings protecting the instrument from unauthorized or inadvertent changes Attempting to change settings while the instrument is locked will display LOCand beep e When in the Lock Unlock Mode and the instrument is locked the display will show SE LOC The instrument may be unlocked by pressing the UP button If SEC is displayed refer to the Secured Password Protection section below When the instrument is unlocked the display will show SET UN LOC The slash denotes that the display is alternately showing UNand LOG this is necessitated by the 3 5 digit limita tion of the display Pressing the DOWN button will lock the instrument e Pressing and holding either the UP or DOWN buttons will save the locked or unlocked setting depending on the button and reset the instrument This feature is useful in situations where it is difficult or undesirable to power off the instrument e Pressing the MODE button will navigate to the Sensor Cable Compensation mode Secured Password Protection Instruments may be specially ordered with password protection
83. r DOWN buttons to modify the cal adjust value and observe the alternately displayed dewpoint Perform this adjustment until the dewpoint matches the value shown by the reference instrument h Press the MODE button to go to the next mode this will save the new cal adjust value and 1t will be retained even if power is turned off Entering a known Adjustment Value If the sensor is being replaced an adjustment value should be supplied with the sensor to enter it into the instrument 26 Section 3 Instrument a Go to the CAL AD mode and press the UP button the display will show the current value in the range of 1 99 to 1 99 followed by blinking horizontal lines ignore the alternately dis played dewpoint b Use the UP or DOWN buttons to modify the cal adjust value as necessary c Press the MODE button to go to the next mode this will save the new cal adjust value and it will be retained even if power is turned off 6 Analog Output Span selection 4 20 mA or 0 24 mA By pushing the UP or DOWN buttons the user may select the desired span of the analog output 7 Testing the analog output By pushing the UP DOWN or Pressure Correct buttons the user forces the analog output to its high low and mid range values respectively This facilitates the hook up and testing of the user s monitoring equipment 8 amp 9Output range setting These modes are used to set dewpoints corresponding to the low and or high end of the Analog Out
84. rc ideas 3 2 2 Sensor Technical Specifications ta 4 2 3 Sensor Installation amp Sampling Techniques srrnrrnnnnronvnnrennnnrerrnnrerrnnnrrrnnenransenrrsernrsssnnrseer 4 E O 5 232 RUT ACU Ve sl r ess 6 224 Mechanical Instala pratar 7 2 5 Troubleshooting unexpected readings visi id 8 3 AS tt 9 3 1 Precautions using the Dewpoint Transmitter DT aaiaaaaaaaaaaaaasaasasssnssassansanssnnsnnnsnnsnnnni 9 3 1 1 Electromagnetic Compatibility Considerations aaaaaaaaasvaass ssaasasasassaaaassnasaaasaaaaaaaana 9 3 2 Instrument Technical Specilications id 10 A A S RRR Rd r 11 3 3 1 Instrument Mechanical Installation aaaaaaaaaaaaaaa aasaaasaaasaassaasaaaanaaanasnaasanaaaaaaaaaaaaaa 11 3 3 1 1 DT PM DIN43700 Enclosure Installation ooooooocnncccconnnonananononccnononananononccnonnnno nos 11 3 3 1 2 DT NEMA IP65 Enclosure InstallatiON ocoonooonnnnnncnononnnonananonococnononananonocccnonannnnos 11 3 3 2 Electrical oe NT SR 12 Eee PONTA 12 3 3 2 1 1 AC Mains Electrical Power Connections 68 icc ii ke BEG 13 3 3 2 1 2 Low Voltage DC Powered Option Electrical Power Connection 13 3 3 2 2 Sensor COMNECUON svarende denna sista Pada a a Ha k td al aa 13 A Me Alarm Contaetsulmaonad Su O a an aaa la ala jaaa kal 13 3 3 2 4 Interfacing to the Analog Output sus 14 5 Sens TNS op 15 3 4 Operating the hs ee aie 15 3 4 Starine NO 15 342 Display Conventions idos 16 3 43 Push Button
85. regulations Consult with National Electri cal Code article 400 and or other nationally or locally recognized procedures relevant to your installation You will most probably require a disconnect switch and power wiring The power cord provided with the instrument is intended only for testing it may not be used for a permanent field wired installation This instrument is UL approved for field wiring e If weather proofing is required consult your representative for an optional enclosure The XDT is not intended for direct outdoor installation unless it is appropriately housed e Do not install the unit near heat sources such as radiators or air ducts e Do not install the unit in places subject to extreme mechanical vibration or shock If this is not avoidable use resilient mounting If in doubt call your representative Before handling the circuit board outside its enclosure discharge any static electricity bildup on your person by touching a grounded metal object Integrated circuits can be damaged by electrostatic discharge handling the circuit board by its edges and avoiding touching any metal components on the board decreases the chances of electrostatic damage 3 1 1 Electromagnetic Compatibility Considerations The XDT has been designed and verified by testing to meet the requirements of the EC Council EMC Directive 89 336 EEC for Industrial Scientific amp Medical equipment The sensor ground is isolated from the AC ground logic g
86. round 4 20mA loop return etc however they are also shunted with a 0 luf capacitor 1M Ohm resistor and a 33V Transient Voltage Suppressor this prevents electrostatic buildup noise pick up and in conjunction with the internal fuse protects the instrument from over voltage inputs Please consider the following electromagnetic interference issues during installation e In order to provide an acceptable noise environment for the XDT or any other digital equip ment in the proximity of switched inductive loads it is recommended that there be varistors placed across the inductors to keep down the high voltage spikes during transitions e Any circuitry which is activated by relay contacts should account for the contact bounce one simple debouncing method is placing a capacitor across the relay contacts e AC power wiring should be routed as far away from the XDT and its wiring as practical XDT User s Manual 3 2 Instrument Technical Specifications Enclosure aaa a Environmental Range Mains Supply Voltage Electrical connections Wiring requirements Input resolution Indicators Engineering units Alarm relay contacts Isolation ineine Approvals Classifications XDT OEM bare board XDT NEMA tabletop or surface mount watertight IP65 tested and NEMA 12 tested XDT PM panel mount DIN 43700 dimensional stan
87. ry defaults of 100 C to 20 C which is 0 014 to 23612 ppmV then the current loop output will vary only from 4 1 to 4 2 mA in the area of interest consult with the graph on the following page In most instances this would be an unacceptable output for proper monitoring of the measurement In this example the user should adjust the analog output low amp high ranges such that the output range is better suited to the measurement of 10 to 100 ppmV It may be useful to select the low and high ranges to be 5 and 150 ppmV respectively thus out of range conditions will be detected properly Then the low range will be set to SppmV which is 65 5 C dewpoint and the high range will be set to 150ppmV which is 38 5 C dewpoint Now the current loop output will be 4 55 to 14 48 mA in the range of 10 to 100 ppmV the 10mA variation is more than sufficient for a good measurement by the user s equipment One may carry out similar calculations for LBS or G M3 and choose the appropriate settings While making these computations it may be useful to obtain a copy of Xen taur s dewpoint calculator this is a Microsoft Windows program which simplifies the process of converting dewpoint measurement units It is available at www xentaur com If you are not cer tain how to carry out such calculations send by e mail to xentaur xentaur com or by fax to 631 345 5349 your system specifics and some one will get back to you with appropriate analog out put setti
88. s eee oN Use probe paper clip to push control buttons consult the manual ATH viso 7 85 ll c NC z Ol CX LOWRELAY lol No Z N o P cho c A Io F VG ot 2 He lo ps lo RET lo RxD lo TxD lo ARET lo AOUT lo SIGNAL RET lo SIGNAL IN lo lo S Panel Mounted Instrument with a silkscreened face plate with holes DEWPOINT TRANSMITTER Panel Mounted Instrument with membrane switches In general the MODE button navigates through the different user options Modes the UP and DOWN buttons modify the units values or choices in the selected mode Refer to the flow dia grams in Appendix A for detailed overview of button functionality A button may be held down for a prolonged time for accelerated incrementing or decrementing of numeric values 3 4 4 Operating State Upon power up the unit performs certain initialization tests see table in section 3 6 and enters the Operating State in the Viewing Dewpoint mode Depressing the MODE button will change modes see appendix A in the following order 7 Viewing Dewpoint Alarms Start Calibration Viewing Serial Number back to Viewing Dewpoint The unit will return to Viewing Dewpoint mode if no buttons are pressed for 30 seconds unless it is performing a cali bration 3 4 4 1 Viewing Dewpoint Mode In this mode the user can view the dewpoint this is indi
89. s sizes As coa ka ata saga aaa laa a pg stab aula 16 SAN Opera O as E E 17 3 4 4 1 Viewing Dewpoint Mode vs 17 SAA NAV NS 19 AES SAT OI ge ee 20 3 4 4 3 1 SpanCheck Mode iii ir 21 3 4 4 3 2 Single Point Self Calibration manual or scheduled 2aaaaaaaaaaaa assssssssaavsavaaa 22 3 4 4 4 Viewing Serial Number Mode ias sin 25 JA Se SE 25 3 5 Resetable Audio Visual Alarm Option NFPA compliant aaaaaaaavvaas assssssassavsaanaa 28 3 6 Troubleshooting the Instrument aaaaaaaaaaaaaaassasassaaasanasvaasaaaaaaaaaaanaaanniaaanananaaanaaananaai 29 Mame A A A r 31 MSL OSS EE cae ose oe sauce susie a aka 33 Appendix A Flow Diagram of Operating State User Interface aiaiaaaaiaaasassassassssasasaaa 37 Appendix B Flow Diagram of Set Up State User Interface aaaaaaaaaaaaiasasssaassasasssasaaaaa 39 Appendix C Sensor Mechanical aaaaaaaaaaaaaasaaasaaaanasanasnnnnnnnnnannnannnnnnnnsnnnnannnnnnannnnsnnnasnaana 40 XDT User s Manual Appendix D Optional Sensor Fittings is 41 Appendix E DT Circuit Board DIMENSIONS querria 42 Appendix F Sensor SpanCheck Theory of Operation aaaiaavassassssssassassssassssassssassnsaaiaa 45 Appendix G Dewpoint Response time Analysis aiaaaaaaaaaaasaaassasansassasassnsanssnnnnnnnnnsnnnnnnnnnini 46 Appendix H Sample Gas Filter Considerations a aaaaaaaaasassassassasssnssassnssanasansnnsnnnnnnnnaiaa 48 Appendix I DT
90. son for Return Information Failure and hookup description if applicable Process material s and or environments including radiation to which the equipment has been exposed An RAN will not be issued without this information S r m Certified by Name Title Signature Date OSHA Hazard Communication Standard 29CFR 1910 1200 mandated that we take specific steps to protect our employees from exposure to potential hazards Therefore a letter certifying that the equipment has been decontaminated must accompany all equipment exposed to hazardous contamination Xentaur Corporation 84F Horseblock Road Yaphank NY 11980 USA tel 631 345 3434 fax 631 345 5349 Index Symbols Ce ene 17 Paet Be 17 A AC power voltage oo 10 accuracy C F specification 4 calculated Ibs or ppmV 56 adjusting low sensor attenuation and Cewpoint oes 26 alarms Checkin s sauen HS 19 present setup 19 relay contacts 10 setting u u EEK wiring 13 AMO sus 3 analog output computation linearity Ae 1680 Desperat range Setting reipisins 27 span select 4 20mA or 0 24mA 27 testing wiring antistatic approvals audio visual alarm aaaavaasasasasasasasan 28 Automatic Calibration a aiaiaiaiaci asa 20 B board dimensions aiiaiaasisiiasisssasaaai 42 box intra box dimensions
91. strument this is useful in instal lations where power can not be turned on and off easily Pressing the Pressure Correct button will cause the instrument to enter the setup state Pressing the MODE button returns the unit to the Viewing Dewpoint Mode 3 4 5 SetUp State To enter the Setup State power up the unit or reset it from the serial number Mode and hold the MODE key pressed while the unit is initializing Refer to Appendix B for a flow diagram of the SetUp State The setup state provides eleven capabilities each one controlled from its own mode Depressing the MODE button navigates through the modes in the following order 7 Select Alternate Display Units Select Sensor Type Set Measured Attenuation of Sensor at a Low Dewpoint Set the Low Dewpoint at which the Attenuation was measured Set the Calibration Mid range Adjust Analog Output select 4 20mA or 0 24mA Perform a Test and Verification of the Analog Out put 3 Set dewpoint corresponding to low end of Analog Output Set dewpoint corresponding to high end of Analog Output u Lock Unlock the instrument 7 Sensor Cable Compensation back to These eleven functions are explained in their respective sections which follow Note that modes 6 7 8 amp 9 will appear only on instruments with the analog output option Changes can be made only to an unlocked instrument the changes are stored when the MODE button is pressed and retained even if the instrument power is turned off
92. t is available free of charge To prevent any leaks tighten the fitting into the sample cavity with a 1 wrench 1 8 turn past fin ger tight to assure metal to metal contact The sensor can be removed from the fitting by unscrewing it Make sure that the sensor is securely fastened to the fitting the tension washer should be compressed so that it does not come loose during use XDT User s Manual 2 5 Troubleshooting unexpected readings If erroneous readings are suspected on a newly acquired instrument compare the serial number engraved on the sensor sintered filter to the label on the instrument The two should be the same if they are not the instrument may not be calibrated with the installed sensor To troubleshoot other problems identify the unexpected reading category in the following table and consider the possible causes and appropriate diagnostic action and remedy Symptom Possible Cause Diagnostic Remedy Reading is not changing Condensation in sample system Condensation will occur if the temperature of the sample system at any point is below colder the dewpoint temperature of the sample gas Once having formed the sample reaching the sensor will have a dewpoint equal to the temperature of the condensation regardless of the dewpoint of the source gas Slow Response 1 Water vapor in the system 2 Flow rate too low 3 Sample pipe too large and or too long 4 Unsuitable sample pipe
93. t with pre filtering may be a necessity in many instances However the filter housing and element may affect the dewpoint reading and or the response time of the system Below is a graph comparing measurements from the same calibrated sensor with and without a filter utilizing a polycarbonate bowl All other parameters which may affect the measurement were kept constant Outside of the sample system a rather hot and humid environment was cre ated to illustrate a worse case condition As can be seen the filter does not cause problems for dewpoints greater than 50 C However the systems ability to make precise measurements quickly deteriorates for dewpoints below 55 C Effect of polycarbonate filter on dewpoint measurement Tests performed inside environmental chamber at 30 C temperature and 100 RH Test gas flow rate 3LPM Using XDTsn 2007 and XTR 100 sensor sn 18107 Data with legend ALL SS was taken with an all stainless steel system Data with legend Through Filter was taken with same system but with the addition of a polycarbonate bowl filter Tested Instrument C MBW C ALL SS C Chilled mirror reference instrument MBW C With this in mind the user should select the appropriate filter construction materials It is impor tant to note that a stainless steel housing filter will not cause measurement errors however if the filter element inside the housing is made of hygroscopic
94. te filter with suitable capability do not use hygro scopic filter materials Refer to Sample Gas Filter Considerations Appendix H Section 2 Sensor and Sampling Techniques 2 3 1 In situ Installation In situ installation is recommended only for measurements where the gas pressure is expected to vary little the gas is expected to be free of contaminants the gas temperature is within the operat ing specifications of the sensor and there is no chance of liquids coalescing Examples of applica tions suited for in situ installations are pure gases output of desiccant dryers for instrument air glove boxes etc For most other applications in situ installation should be avoided for the follow ing reasons e Sample conditioning is almost always necessary to avoid exposure of the sensor to liquid water and other contaminants such as hydrocarbons which may damage the sensor or affect accuracy over time e Variations in line pressure affect the reading of the sensor because dewpoint varies with pres Sure e If the gas line is under pressure it is more likely that water condensation occurs which may damage the sensor e Under a pressurized system removal of the sensor without the installation of isolation valves can be dangerous If in situ installation is required bypass mounting is preferable make sure to install the sensor at the upper surface of the gas line to minimize its exposure to liquid water should condensation occur the X
95. the 12 flashing Pressing the MODE button will flash the next 0 Pressing the UP button three times will display 1230 Pressing the MODE button will flash the last 0 Pressing the UP button four times will display 1234 Pressing and holding the MODE button will display SEr UN LOC indicating that the instrument is now unlocked It may be locked without the password same as any other instrument Note To avoid unauthorized changes it is imperative that instrument is returned into the locked mode 11 Sensor Cable Compensation As noted in other paragraphs this instrument measures the impedance of the sensor in the form of attenuation in decibels from which it computes the dewpoint At very low dewpoints the sensor capacitance is small enough to be in the same order of magnitude as a long coaxial cable Thus the measurement circuit must be compen sated for the impedance of the sensor cable Instruments which are delivered with a cable are already compensated at the factory and should not be compensated again however if a new cable is connected the following procedure should be used for compensation also refer to the Set Up State flow diagram in Appendix A a Disconnect the sensor from the cable by unplugging the BNC connector keep the cable connected to the instrument b Prepare a means by which the BNC connector at the end of the cable could be reliably shorted using a jump
96. the range is programmable Output resolution is 0 1 C dewpoint linearity 1 max load resistance 500 Ohms Digital RS 232C 9600 8 E 1 can interface to a Personal Computer or other RS 232 device Ordinary use explosion proof housed and safe area instruments 10A 250VAC or 30VDC Intrinsically Safe Div 2 instruments use hermetically sealed relays 3A 120VAC Sensor is isolated from power ground analog output and RS 232 but they are shunted with a 33V tran sorb a 1M Ohm resistor and 0 1uF capacitor Refer to Electrical Connections section CE for electromagnetic compatibility accredited laboratory tested and certified UL and cUL for ordinary field wired use Intrinsically Safe configurations for NEC standard IS installations UL for CENELEC standard IS installations DEMKO refer to instrument labeling 10 Section 3 Instrument 3 3 Installation 3 3 1 Instrument Mechanical Installation The XDT is available in several different physical configurations Please follow the instructions below which describe the instrument being installed The sensor installation is discussed in Sec tion 2 Sensor and Sampling Techniques 3 3 1 1 XDT PM DIN43700 Enclosure Installation The standard XDT PM is provided with two clip on compression panel mounting brackets These brackets allow the user to mount and secure the instrument onto a properly cutout panel 137mm x 67mm Consult with drawing in appendix E for all relevant dimensions Install
97. to the frame AC power ground however it is isolated from the sensor ground see section 3 1 1 To connect the instrument to a Personal Computer a 3 conductor cable is required with wires to be placed in the screw terminals of the XDT at one end and with either a DB9 or DB25 female connector at the other end Signal Name Pr ve DB9 pin or DB25 pin Transmit Data 9 TXD or Tx 2 3 Receive Data 10 RXD or Rx 3 2 Signal Ground 11 GND 5 7 RTS n c 7 4 CTS n c 8 5 DTR n c 4 20 DSR n c 6 6 Note that some Personal Computer Programs may require that RTS amp CTS and or DTR amp DSR are jumpered for proper operation This jumpering may be accomplished at the DB9 or DB25 connector CAUTION Connecting the RS 232C interface on instruments which do not have the option installed will damage the instrument Refer to appendix K for details on the protocol used on the RS 232C interface 3 4 Operating the Instrument 3 4 1 Starting up The instrument is ready for use as soon as the power cabling is connected When power is applied the instrument will initialize its program and for a moment display XEN then it will enter the Operating State If the MODE button is held pressed while the instrument is performing its power up initialization it will enter the Set Up State which allows the user to select setup vari ables of the instrument XDT User s Manual 3 4 2 Display Conventions 1 To display ch
98. ucted as a capacitor whose dielectric consists of porous Aluminum Oxide as well as the gas that has entered in the pores of the Aluminum Oxide The plates electrodes of this capacitor are an aluminum substrate and a porous gold layer deposited on top of the Alumi num Oxide the porous gold electrode allows transfer of gases into or out of the Aluminum Oxide pores The capacitance due to the Aluminum Oxide is always constant while the capacitance due to the gas varies according to the gas content and pressure Since the dielectric constant of water is orders of magnitude larger than that of any gases being measured the quantity of water vapor present in the pores changes the capacitance of the sensor to a much greater extent than any other system variable For the same reason the extremely large dielectric constant of the water mole cule any capacitance variations arising from the Aluminum Oxide such as changes due to tem perature are insignificant in relation to the capacitance due to the water content Thus the sensor capacitance varies greatly in proportion to the water content in the surrounding gas The sensor is designed such that the relationship of the quantity of water and the resultant capacitance has an S shaped curve At the extremely dry end the curve is asymptotic to the capacitance due to the Aluminum Oxide and the gas while at the very wet end the curve is asymptotic to the capacitance due to water molecules packed extremely tight
99. ure cause relays to react as if there is high dewpoint i e if sensor cable breaks the relay de energizes When following these instructions it may be helpful to refer to Appendix A 1 Make sure that the instrument is not in the locked mode 2 While in the viewing Dewpoint Mode push the UP or DOWN buttons until the C indi cator appears 3 Push the MODE button until the display shows ao E the asterisks take the place of characters that may appear depending on previous set tings the SET indicator means that changes can be made the HI indicator means that we are changing the HI Alarm alarm 1 Note that if the instrument does not have the alarm options installed this MODE User Option will not appear A 4 Push the UP or DOWN buttons until the display shows Me b the B means energize below or de energize above set dewpoint the Hmeans faults look like high dewpoint If the display shows LOG the alarm changes are locked out repeat step 1 XDT User s Manual 5 Push the MODE button The display will show ian t DEWPOINT the DEWPOINT indicator means that we are changing the alarm trigger dewpoint 6 Push the UP or DOWN buttons until the display shows He 15 47 R DEWPOINT 7 Push the MODE button The display will show t C the Z indicates that we are changing the hysteresis of the alarm 8 Push the UP or DOWN buttons until the display shows UN H Yr C 9 Pus
100. z cable see section 3 4 5 11 2H Re ERR EEP EEPROM write cycle not completed if this persists return for service LOC Attempting to modify a locked unit unlock unit see set up state 3 4 5 10 SEC Attempting to unlock a secured unit HI flashing while The HI Alarm alarm 1 relay is deenergized See section 3 4 4 2 Setting the Alarms viewing DEWPOINT LO flashing while The LO Alarm alarm 2 relay is deenergized viewing DEWPOINT e 3 6 AQ OPN The Analog Output sees an open circuit g check the cables connecting the analog output make 3 sure the terminating impedance is less that 500Q Q 2 PSI flashing when dis Pressure correction is enabled the dewpoint is computed using E refer to section 3 4 4 1 playing dewpoint programmed pressures 70 C 94 F with An XTR 65 sensor is measuring less than 70 C or 94 F D P check instrument flashing DEWPOINT upgrade to XTR 100 sensor RNG number can not be displayed in 3 digits XEN Turn on message Xentaur Greek X display is dark No power to instrument check power to instrument check fuse Legend denotes a beeping accompaniment to the message denotes alternately flashing messages 30 Section 3 Instrument 3 7 Maintenance The XDT PM and XDT NEMA instrument enclosures may be cleaned when necessary using a damp moist cloth The XDT OEM bare circuit board may be cleaned by blowing air across the circuit board The sensor should not be cleaned as it may b

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