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Optisure Optical Hygrometer User`s Manual

1. 24 Al v V PES EE T S S eee 26 EE 27 jus ec Opara reo RR 28 CEP Lyn M 29 PIU TEI USDC SS nod NN N IM EUMD TREE 30 BIGGER MT A N eee eee er ere 31 Switching MAXCOOL and MEASURE Mode i rere rn hr ra ka dd Switching STANDBY and OPERATE Mode 33 VP MENU SEIEN rere IE REM E OE MIC MM CA M N 34 Dec Sue SEE HO EE 34 Set Parameter m NN 34 Communications Serm SCION esse ed msn 39 Windows Device Manager Screen acis geg gg deeg Eege 40 VIESIS S66 c S nn ES 41 ONI PRC V del g S lt E 42 Optisure Series Variables Editor Screen NEEN 45 Power Supply Fuse Repl acemert Ee 46 Remove and Replace Fan RE 47 Mirror and Optics ICO sa on EE N I NN ah 48 Fitting THEM OS COO a nos nn N ei 49 MIT DINO ME gl A i D TEE 54 Instrument Packing D ldi and sies sos d sni 55 ABL ge Pic UU UU Tm 60 BE IONE IO Dee Gada da se ms T 60 FO C aa os ss ren Pn E E IM Mua M CE 60 MOODUS CONNECTION EE 65 I VICE E sv ss n try atte tree 76 Communications WiH60Wisssasssneameas nem s nes 77 Kahn Instruments Optisure Optical Hygrometer User s Manual Appendices Appendix A Technical SP i Cdl0l us ee wanna nn 57 Appendix B VOM T e vas N NE 60 Appendix C Setzen REN 62 Er MV er E EE 62 C2 Temperature DOW PONE mc 62 C 3 ir E e OT a EA A 62 C 4 BRAUNS a N NN 62 Co Conversion of bara tO psia and kPa rennen 63 Appendix D Modbus RIU COMMUNICATIONS as a T oo OUT 65 D 1 ligiu
2. Figure 2 Operating Principle Kahn Instruments 3 INSTALLATION Optisure Optical Hygrometer User s Manual 2 INSTALLATION 2 1 Safety It is essential that the installation of the electrical and gas supplies to this instrument be undertaken by competent personnel 2 2 Unpacking the Instrument Both the horizontal and vertical models are packed in a similar manner Figure 3 shows the unpacking method NOTE The free standing horizontal version may be converted to a rack mounted instrument by means of an optional rack mounting kit refer to Section 2 5 8 Figure 3 Optisure Optical Hygrometer Packing 4 Issue 9 2 January 2014 Optisure Optical Hygrometer User s Manual INSTALLATION Open the box and unpack carefully as follows see Figure 3 1 Remove the accessories box 4 2 Lift out the instrument 2 together with its end packing pieces 1 and 3 3 Remove the end packing pieces 1 and 3 set the instrument down at the site of installation 4 Save all the packing materials for the purpose of returning the instrument for re calibration or any warranty claims The accessories box should contain the following items refer to Figure 4 Traceable calibration certificate SD memory storage card Optics cleaning kit Microscope optional USB communications cable Pt100 temperature probe optional IEC power cable Application software CD pe See e M ese S YY x User s manu
3. 0x22 1x21 0x20 10 and 0100 1100 1100 1100 1101 0x2 1x27 1x2 0 3 Therefore the word value 0100 0001 0010 0100 1100 1100 1100 1101 4124CCCD Consequently for sensor 1 register 0001 4124 and register 0002 CCCD Example 2 0 0000045 Sign bit 1 Exponent 18 therefore exponent field 127 18 109 and bits 30 to 23 01101101 The mantissa 1 179648 which in binary representation 1 00101101111111010110101 i e 1x28 1x2 1x23 etc 0 0000045 Therefore the word value 1011 0110 1001 0110 1111 1110 1011 0101 B696FEB5 Consequently for sensor 1 register 0001 B696 and register 0002 FEB5 72 Issue 9 2 January 2014 Optisure Optical Hygrometer User s Manual APPENDIX D 15 14 13 121 1 100 9 8 7 6 5j 4 3 2 1 0 DP 00000000 Temp 00000001 ppm v 00000010 ppm w sf6 00000011 g kg 00000100 g m 00000101 pressure 00000110 flow 00000111 rh 00001000 temp difference 00001001 Table 21 Register Configuration P Kahn Instruments 73 APPENDIX E Optisure Optical Hygrometer User s Manual Appendix E Application Software Installation 74 Issue 9 2 January 2014 Optisure Optical Hygrometer User s Manual APPENDIX E Appendix E Installation of the Application Software Optisure Optical Hygrometer instruments have a Modbus communications interface via the USB port that enables remote access to the instrument s configuration and data logg
4. EMC requirements Group 1 Class A equipment Emissions and Basic Immunity IEC61000 3 amp IEC61000 4 EN61010 1 2001 Safety Reguirements for Electrical Eguipment for Measurement Control and Laboratory Use Part 1 General Reguirements Andrew M V Stokes Technical Director Date of Issue cember 2013 Kahn Instruments 79
5. Optisure Optical Hygrometer User s Manual Kahn Instruments Inc 2015 This document is the property of Kahn Instruments and may not either in part or whole be copied or otherwise reproduced communicated in any way to third parties nor stored in any data processing system without the written authority of Kahn Instruments Inc Optisure Rack Mount Version For Kahn Instruments contact information please go to www kahn com Optisure Optical Hygrometer User s Manual Contents scu EEN viii FICEK IBD EE viii PILS Si TUS EEUU viii MOIS PERC ss S td I Sata e MUNI NN viii Repar and PN hell CB PPS SE M Dre dai ROP URP SIRO SEENA Viii E leie Le viii ATELY COMI ob a D N nn viii ADD ass N NO NE N NE NN NI NN NN m I N NN IX VISS a a S E E E E E IX dE IE a s N 1 LL OPa ANP le EE 2 EE Ip AE ne as nn 4 USER o m 4 d2 Unpacking the MET EE 4 A SCPC Kodi B za ad sd nn aai 6 2 3 1 Environmental Requirements ausa ss ONT MUERTA IPSE US S Ad 6 2 3 2 Electrical Requirements eeeeeeeee nennen nennen nnnm REN RER nne nn nenne 6 22 EXESDIOL Pc Oll Caner eee ener ee emer S oa dise ADD E PO Grund adus 7 2 5 Rear Panel Connections All Versions ssssesssssssssnnnnnnrsnnsnnnnnsnnnnnnnnensenennnnenenene 10 Sege PONT leie V Ae e 10 2 9 2 Analog Output CobDbectloliSi sads sd 11 25 3 Alarm Output
6. H n8 amp o para000965 Ra Computer gt s Disk drives gt g Display adapters gt eg DVD CD ROM drives gt be Human Interface Devices gt E Keyboards gt D Mice and other pointing devices gt K Monitor d s gei Michell Instruments USB Driver A amp Network adapters Note COM Port number may change a 3 Ports COM amp LPT oa J Communications Port COMI d D Processors Zei Sound video and game controllers F Storage controllers JE System devices d BR Universal Serial Bus controllers Figure 33 Windows Device Manager Screen 40 Issue 9 2 January 2014 Optisure Optical Hygrometer User s Manual APPLICATION SOFTWARE 4 3 Data Acguisition or Edit Variables Mode Once communication has been established the Options Screen is displayed Move the mouse over the buttons to see an explanation of the choices C icati IP e d d MEN 1 0 0 50 40 Figure 34 Options Screen Kahn Instruments 41 APPLICATION SOFTWARE Optisure Optical Hygrometer User s Manual 4 3 1 Data Acguisition This mode of operation allows all measured instrument parameters to be graphed and logged in real time WE rat laaa TV Log File and plot Acguisition interval tools Plot and log interval 2 secs Stop DCC off Maxcool on Standby on Log filename fempty G3 De point 8 05 C ni 0 16 Rh New Data Fault Process Cooler sw 20 000 C aan 3056 24 761 0 1 0 Bara 2s 1 90 g Kg Control Wwe 21 2
7. Ss 2 53 g m 00 01 24 Figure 35 Data Acquisition Screen Data Acquisition Control Toolbar Bum Begin data acquisition and logging A filename must be first be selected to enable data logging Pause sid Pause data acquisition Stop data acquisition Plot and log interval Time in seconds between graph and log file updates Path and filename of the log file Log filename Click the small folder icon next to this text box to create a new log file DCC Initiate a DCC cycle Refer to Section 3 6 1 for detailed information on the DCC function Toggle between MAXCOOL and MEASURE mode Maxcool Refer to Section 3 6 2 for detailed information on the Maxcool function Toggle between STANDBY and MEASURE mode Standby Refer to Section 3 6 3 for detailed information on the Standby function Table 4 Data Acquisition Control Description 42 Issue 9 2 January 2014 Optisure Optical Hygrometer User s Manual APPLICATION SOFTWARE Instrument Readings and Status This area displays all measured instrument parameters and shows the status of the Fault Process and Sensor Cooler Alarms Graph Controls Plot Automatically advances the graph as new data is acguired Dragging the mouse on the graph scrolls along the time axis Scroll Time Drag to the left to scroll forwards Drag to the right to scroll backwards Dragging the mouse on the graph changes the scale of the time axis Zoom Time Drag to the left to increase the scale size Drag
8. tracks measured parameters Interval between consecutive log points Set to YES to start logging set to NO to finish logging and close current log file Automatically added when logging started Output signal type 4 20 mA 0 20 mA or 0 1 V Output parameter monitored list of 10 Upper span limit Lower span limit Output signal type 4 20 mA 0 20 mA or 0 1 V Output parameter monitored list of 10 Upper span limit Lower span limit mA Output signal type 4 20 mA 0 20 mA or 0 1 V Output parameter monitored list of 10 ml min Upper span limit ml min Lower span limit Process parameter to be monitored Process alarm trigger point Contrast level adjust to suit Display resolution C Temperature unit C or F bara Pressure unit if sensor equipped English Display language min Time scale for stability graph Frost Assurance facility ON OFF Adjust to local time as required Set to local time and date at despatch h m Note Current time example only Select to quit to main display Displays current Instrument and display firmware issue details for information only Default Set Up Parameters Kahn Instruments OPERATION Optisure Optical Hygrometer User s Manual 3 7 3 8 Pressure Measurements As an option the Optisure instrument can be equipped with an internal pressure sensor that measures the sample gas pressure If equipped this option allows for the on l
9. 0 1V 00 10 Table 10 Register Configuration B2 68 Issue 9 2 January 2014 Optisure Optical Hygrometer User s Manual APPENDIX D 15 14 13 12 11 10 9 8 Measurement 0000H DCC 0001H Data Hold 0010H Max Cool 0100H Standby 1000H GTI Sof Stop Logging Fault Alarm Initiate Standby In Control Heating Cooling 1 1 1 Optics Reset 1 Display Hold 1 Max Cool Initiate 1 Start Logging 1 FAST Frost Assurance 1 Humidity Alarm 1 External PRT 1 DCC Initiate 0 Table 11 Register Configuration D Status Word 8t7 eo 5 4 3 2 11 0 d Language Measurement 0000H DCC 0001H English 0000 Data Hold 0010H Chinese 1111 Max Cool 0100H S S Standby 1000H Table 12 Register Configuration E Units OOH 01H OOH 01H kPa 10H 1 DP 2 DP 3 DP 10H 1 FAST Enable Psig Barg Reset Defaults 15 14 13 122 11 10 9 8 7 6 5 4 3 2 1 0 Display 2 Display 1 o Dispay2 Display tt DP 00000000 DP 00000000 Temp 00000001 Temp 00000001 ppm v 00000010 ppm v 00000010 ppm w sf6 00000011 ppm w sf6 00000011 g kg 00000100 g kg 00000100 g m 00000101 g m 00000101 pressure 00000110 pressure 00000110 flow 00000111 flow 00000111 rh 00001000 rh 00001000 temp difference 00001001 temp difference 00001001 Table 13 Register Configuration F Display Setting A Kahn Instruments 69 APPENDIX
10. ACQUISILION or Edit VariabIes MOU visuteccncccnssizenssteccecteoberttiatnencecressianeriestnas 41 4 3 1 etal PEG UISI OM RT 42 4 3 2 E ele VE 44 s PANTENA NOE sE 46 zw EH 46 B7 Een ET nes D N UEM TUM 46 5 9 Fan ruler EE 47 S4 Sensor uio E I II ULTIO 48 5 4 1 Png tne MN ChOSe Ole OPONA E 49 6 GOOD MEASUREMENT PRACTIICE aaraa 50 Bell INNING TAGES ass sa N A J NN 51 EE e TE NR Le es aa S O N 54 KC De e e E 54 D FRPP R JIUNTUKSMIFFINGeeecseccowsweeegcoewnnen 55 Tables Table 1 Front Panel Controls and INdiCatOrS ja b a 8 Table 2 Rear Panel Controls nd l idif fOl s was s 9 Table 3 Default Set Up Parameters ss s nu M 35 Table 4 Data Acquisition Control Description ENEE 42 Table 5 Graphi Contool RT ll dE 43 Table 6 Status Bar Pe ciibbidliiaasas a non nn 43 Table 7 Modbus Holding fm kt ri Ps S N N nn 67 Table 8 Register Onli0dil0li s www neue 68 Table 9 Re i tek ConNguraton Pa LE 68 Table 10 Register Configuration EI BZ ss on oL S S 68 Table 11 Register Configuration D Status Word senas dns 69 Table 12 Register Configuration E Units eese nnnm nnn nnns 69 Table 13 Register Configuration F Display Setting A ccscscsscsessesessccrseearseeersneatenetens 69 Table 14 Register Configuration F Display Setting B eee nnn 70 Table 15 Register Configuration H DE 70 Table 16 Register Configuration J cccsssvestcestvsdeedanesscankinsiesnsyoreoerintainsedeiaeriaseauntoarsiens 70 T
11. DCC period has finished the measurement MEASURE period commences during which the control system decreases the mirror temperature until it reaches the dew point The sensor will take a short amount of time to settle on the dew point The length of this stabilization time depends upon the temperature of the dew point When the measurement is stable the Sensor area of the display will indicate CONTROL The end of a DCC cycle re sets the interval counter meaning that another DCC will start by default in 4 hours time Once the measurement is stable HOLD will release and the analog outputs will resume their normal operation At this point the STATUS area of the display will change to MEASURE At the end of the measurement MEASURE period another DCC cycle commences and the process repeats 28 Issue 9 2 January 2014 Optisure Optical Hygrometer User s Manual OPERATION 3 5 First Time Operation Operate Mode OPERATE mode is the normal setting of the Optisure for dew point measurements To commence operation proceed as follows 1 Switch on the instrument by means of the Power ON switch located on the rear panel of the instrument NOTE Rack mounted models will be turned on when the rack power supply is switched on The instrument display Duration 00 14 22 will now come on typically showing d md the default parameters and units as Sensor CONTROL detailed in Figure 24 2 Check that the sample flow rate is Figure 24
12. HEX i e 17th March 11H for Val1 and 03H for Val 2 Table 18 Register Configuration L 15 114 13 2 1 11 00 9 8 7 6 5 4 3 2 1 0 Value Sign bit 1 for ve values signed int TFFF 32767 8FFF 32768 Table 19 Register Configuration M The humidity values for sensors 1 amp 2 are represented in IEEE 754 single precision floating point format in order to cater for the wide range in the value of ppm This format is Big Ended which means that the high byte is at a lower address in memory than the Lo byte and is represented as such in the register memory map The IEEE 754 format is shown below Bit 31 Bits 30 to 23 Bits 22 to 0 Sign bit Exponent Field Mantissa ER Has 127 bias value Decimal representation of binary where 1 0 lt value lt 2 0 4 m Table 20 Register Configuration N Kahn Instruments Z4 APPENDIX D Optisure Optical Hygrometer User s Manual Register Configuration N Floating Point Representation Examples of floating point to HEX are shown below Example 1 10 3 Sign bit 0 Exponent 3 therefore exponent field 127 3 130 amp bits 30 to 23 10000010 The mantissa 1 2875 which in binary representation 1 01001001 1001 1001 1001 101 Adjusting the mantissa for the exponent moves the decimal point to the right if positive and to the left if negative As the exponent is 3 then the mantissa becomes 1010 0100 1100 1100 1100 1101 therefore 1010 1x23
13. Laboratory is over the range 90 C to 90 C Traceability to National Institute of Standards and Technology is over the range 75 C to 20 C Uncertainty of measurement 0 20 20 C DP increasing linearly to 0 40 60 C DP then rising linearly to 0 63 75 C DP 0 31 between 20 C DP and 82 C DP The uncertainty is based on a standard uncertainty multiplied by a coverage factor k 2 providing a level of confidence of approximately 95 Approved Signatory ci We 22 Nov 2012 Michell Instruments Ltd www michell com Figure 41 Typical Calibration Certificate 54 Issue 9 2 January 2014 Optisure Optical Hygrometer User s Manual PREPARATION FOR SHIPPING 8 PREPARATION FOR SHIPPING For shipping purposes the instrument should be packed into its original carton the latter providing the recommended degree of protection during transit To prepare the instrument for shipping proceed as follows 1 ZE S E U1 A C9 NR Switch off the instrument and remove the power supply cable see Section 2 5 1 If the instrument is rack mounted first remove it from the rack and remove the rack mount wings Remove the optional microscope and re fit the blanking plug Remove the optional remote PRT see Section 2 5 4 If installed remove the USB communications cable see Section 2 5 6 Remove the analog and alarm output connectors see Section 2 5 2 and Section 2 5 3 Remove any connections to the 4 wir
14. Main Display within the operational limits 0 5 NI 1 0 scfh min 0 2 NI 0 4 scfh min If flow rate is not configured as a displayed default parameter change one of the default panes to show Flow Rate 3 Adjust the external flow control valves to achieve the required flow rate d Set up the display to show the required parameters as detailed in Section 3 3 1 5 The instrument is now operational and at the end of a 2 minute initial DCC period will switch to a MEASURE cycle as described in Section 3 4 1 The instrument will now be operating using the default parameters which are as shown in Table 3 Section 3 6 4 describes the method of changing these set up parameters Kahn Instruments 29 OPERATION Optisure Optical Hygrometer User s Manual 3 6 3 6 1 Operating Functions This section describes the DCC MAX COOL STANDBY and SETUP functions that are initiated through the MAIN Menu The MAIN Menu can be accessed from the FRONT page by pressing the key The options are accessed by then pressing the A up and Y down keys EXIT Bledo i0 Te dz MAXCOOL MEASURE STANDBY OPERATE SETUP Figure 25 Main Menu Display DCC Dynamic Calibration Control A manual DCC can be initiated or cancelled by selecting the DCC command from the MAIN menu The DCC command is context sensitive i e if DCC is ON the MAIN menu shows DCC OFF as being selectable Similarly if DCC is OFF DCC ON is shown Dynamic Contamina
15. OFF Sensor CONTROL Qo Set OPERATE Xe o 11 46 Pressure Hi 1 Status MEASURE Duration 00 59 03 Water Content Process ON 0 32 gm raut OFF m Sensor CONTROL Switching STANDBY and OPERATE Mode 33 OPERATION Optisure Optical Hygrometer User s Manual 3 6 4 SETUP Menu SETUP menu is used for changing system control parameters or activating the built in data logging The SETUP menu can be accessed from the MAIN menu using the W down key and then pressing the key Figure 29 shows the key sequence Dewpoint 1 C DURATION EXIT DCC OFF 0 OUTPUT HOLD 0 MIN 1 Pressure SETPOINT MAXCOOL Adp 0 1 RESET OPTICS Status DCC INTERVAL STANDBY STANDBY Duration 00 14 22 DISPLAY HOLD VE eju SETUP al Figure 29 Set up Menu Selection Initially when the SETUP menu is opened DCC is highlighted and all the data fields relating to DCC are shown together with their current settings For first time operation these will be the default settings relating to DCC To select any of the other sub menus use the A up and Y down keys to scroll through the list Any highlighted sub menu can be accessed by pressing the key This highlights the first item of the sub menu The A up and Y down keys can be used to scroll though the other items in the sub menu Press the key to edit the value of the selected item The value will be highlighted to indicate editing is in progress DURAT
16. V 47 63 Hz and switched on proceed as follows 1 Ifthe power supply cable is equipped with a fused plug switch off the power supply remove the plug check and if necessary replace the fuse If the instrument still fails to operate after fitting the fuse and switching the power supply on proceed as follows see Figure 37 E Es E pe Figure 37 Power Supply Fuse Replacement 46 Issue 9 2 January 2014 Optisure Optical Hygrometer User s Manual MAINTENANCE 2 Switch the instrument s ON OFF switch 1 to OFF isolate the external power supply and remove the IEC power connector 2 from the instrument s power socket 3 NOTE If access to the rear of the instrument is restricted e g if the instrument is a rack mounted model it may be necessary to remove the instrument from the rack refer to Section 2 5 9 3 Locate the fuse carrier 4 and pull it out of the connector housing 5 A small screwdriver inserted under the lip may be useful in order to lever it out 4 Replace the fuse cartridge 6 NOTE It is essential that a fuse of the correct type and rating is equipped to the instrument 20mm T type 2 5A anti surge 5 Fit a new fuse cartridge 6 into the fuse carrier 4 and push the fuse carrier 4 back into the power connector housing 5 6 Push the IEC power connector 2 back into the power socket 3 turn
17. and must not be used at pressures above 14 5 psig 1 barg ja Safety Strap Must be equipped when the system is operating at pressures above 14 5 psig 1 barg Refer to Section 2 5 10 Exterior housing of the sensor See Section 5 4 for instructions on how to open the housing and clean the mirror Instrument display Partitioned to show three main panes each of which can be configured to display one of the ten available output parameters A second area of the display shows a stability graph and other process related data Refer to Section 3 3 4 Function keys Used to control the instrument functions and navigate through the menu system Refer to Section 2 2 Gas input port Usually slightly above atmospheric pressure in order to maintain flow rate over the mirror but can be at elevated pressure depending upon application Gas output port Usually vented to atmosphere but can be at elevated pressures depending upon application Table 1 Front Panel Controls and Indicators 8 Issue 9 2 January 2014 Optisure Optical Hygrometer User s Manual INSTALLATION Rear Panel 11 12 13 14 ULM Figure 6 Rear Panel Analog output connector Three 2 wire output channels CH1 CH2 and CH3 each of which may be configured to give either a 0 20 mA or a 4 20 mA current loop output or a 0 to 1000 mV voltage signal representing any one of the measured or calculated outp
18. electrical A N connections DANGER Exercise due caution particularly when connecting to ok external alarm circuits which could be at high potential Connections to the rear panel of the instrument are explained in the following sections Power Supply Input The AC power supply is a push fit into the power input socket as shown in Figure 7 The method of connection is as follows 1 Insure that both ends of the power cable are potential free i e not connected to an AC power supply Check that the ON OFF switch 1 on the power supply connector is switched to OFF Push the IEC connector 2 firmly into the power input socket 3 Connect the free end of the power cable to a suitable AC power supply source voltage range 85 to 264 V AC 47 63 Hz and switch on the AC supply The instrument may then be switched on as reguired using the ON OFF switch Figure 7 Power Supply Input 10 Issue 9 2 January 2014 Optisure Optical Hygrometer User s Manual INSTALLATION 2 5 2 Analog Output Connections The three analog outputs can be configured to represent any of the directly measured or calculated output parameters They are provided as 2 wire signals from a 6 way connector located on the rear panel of the instrument Each of these outputs can be set up as either a current loop signal 4 20 mA or 0 20 mA or alternatively as a 0 1 V voltage signal The conf
19. from the following formula Conversion formula F 9C 9 5 32 C 4 RH Calculation PRT simulators are used to input simulated dew point and ambient temperatures measured in C into both measurement channels For each pair of inputs the reading on the instrument s RH display is recorded Each of these readings is then compared against a corresponding RH value calculated by inputting the same parameters to the Kahn Humidity Calculator 62 Issue 9 2 January 2014 Optisure Optical Hygrometer User s Manual APPENDIX C C 5 Conversion of bara to psia and kPa Use a calibrated 4 20 mA source 00356 to simulate a range of applied pressures covering the instruments full pressure measurement span of 0 to 377 psia 0 to 25 bara 1 56 bar mA For each input current record the display reading for all three units For each display reading calculate the corresponding pressure in the relevant units from the following formula Psia bara 1 14 5 14 7 Kpa bara 100 Kahn Instruments 63 APPENDIX D Optisure Optical Hygrometer User s Manual Appendix D Modbus 64 Issue 9 2 January 2014 Optisure Optical Hygrometer User s Manual APPENDIX D Appendix D Modbus RTU Communications D 1 Introduction Optisure Optical Hygrometer instruments have a Modbus communications interface via the USB port that enables remote access to the instrument s configuration and data logging facilities This protocol o
20. hold specific real time data e g measured dew point temperature Each Modbus message has a two part address code one for the low byte bits 0 through 7 and one for the high byte bits 8 through 15 The facility exists for multiple registers specified by a high and low byte contained in the query message to be addressed and read by the same message Table 7 describes the instruments registers with their respective address locations together with their relevant register configurations and register map definitions NOTE Hexadecimal Hex addresses marked with an asterisk in Table 7 denote instrument specific parameters stored in the instrument s flash memory The register maps Tables 9 to 21 define the data allocated to each bit byte of that specific register 66 Issue 9 2 January 2014 Optisure Optical Hygrometer User s Manual APPENDIX D Address Address Read Patel Register Register Function Value ET dec hex Write ree Config Map Definition E E E es R LN RUMIDITYHE 2 0002 DewpointValue LoWord R N JHUMDIYIO 3 0003 Ambient Temperature Hi Word R N AMBTEMPHI 4 0004 Ambient Temperature Lo Word R N AMBTEMPLO 5S oo RH RT AR 6 0006 Pressure Value LEI PRESSURE 7 007 Ppmv HiWod LEI N JPMVH 8 008 Ppmv loWord R LV PMVIO 9 000 Ppm
21. response is an error response and the associated data bytes contain a code to define the error The error check field CRC Cyclic Redundancy Check allows the master to confirm that the message contents are valid USB Serial Bus Host S8000 ntegrale RTU Figure 46 Modbus Connection Kahn Instruments 65 APPENDIX D Optisure Optical Hygrometer User s Manual D 3 Modbus RTU Connections and Protocol The physical connection from the master to the Optisure Optical Hygrometer uses a USB connection cable between the host and the instrument s communications connector Refer to Section 2 5 6 for details of the connection of this cable The serial port protocol is as follows Baud Rate 9600 Start Bits 1 Data bits 8 Parity None Stop bits 2 Typically a Modbus RTU message is structured as follows Byte 1 Slave Address Value 1 247 Byte 2 Modbus Function Code Value 3 e g read register Byte 3 Start Address Low byte Value 0 255 Byte 4 Start Address High byte Value 0 255 Byte 5 No Registers to read Low byte Value 0 255 Byte 6 No Registers to read Low byte Value 0 255 Byte 7 Error Check Value D 4 Register Map All the data values relating to the Optisure Optical Hygrometer are stored in holding registers Each of these registers is two bytes 16 bits wide Some of these registers contain instrument specific values e g its own unique system address emitter drive values etc and others are used to
22. sensor disabled between measurements In STANDBY mode drive to the Peltier heat pump is removed allowing the sensor to settle naturally at the ambient temperature and so eliminate the possibility of sensor saturation The main use for this feature is during set up for instance where flow rates are being adjusted and the analog outputs are being configured where measurements are not reguired during this period This feature is also used to inhibit MEASURE mode while the mirror is being cleaned Figure 28 shows the method of selecting and cancelling STANDBY mode NOTE When switching from STANDBY to OPERATE mode a DCC cycle will be initiated OPERATE TO STANDBY SEQUENCE STANDBY TO OPERATE SEQUENCE Dewpoint d 11 46 0 t MIN 1 0 Adp 041 Jis Bara Ad 04 Status MEASURE 1 Status STANDBY Duration 02 03 25 Duration 01 02 02 Process ON Water Content a Process ON Fault OFF 1 0 3 2 gm Fault OFF Sensor CONTROL m Sensor CONTROL Qo Select Main Menu Qo Select Main Menu Select Option OPERATE Select Option STANDBY Kahn Instruments Dewpoint 1 Dewpoint au ds 2 DCC OFF Be 1 DCC OFF STANDBY Status MEASURE Duration 02 03 22 jSETUP Process ON d Fault OFF Sensor CONTROL Set STANDBY nae Pressure Adp 0 1 Status STANDBY Duration 02 03 16 Process ON Fault OFF Sensor CONTROL Figure 28 Pressure OPERATE Status STANDBY Duration 00 59 19 Water Contd SETUP Process ON J Fault
23. the instrument configuration to be changed through the application software On launch it will automatically read and display the current values of each of the instrument variables NOTE The variables are not periodically updated on screen To obtain up to date values click the Read button Editing Variables To edit a variable first click on it to highlight it If the variable has a fixed list of options a drop down arrow will appear in the right hand column Choose a new value from the drop down list provided If the variable does not have a fixed list of options type the new value into the right hand column text input area NOTE The variable background colour will turn pink to indicate it has been changed on screen and is pending upload to the instrument Click the Write button to upload changed values to the instrument NOTE Variable values and formatting are checked by the application software before they are uploaded to the instrument A message box will report any errors found Once a modified value has been written to the instrument the background colour will return to white 44 Issue 9 2 January 2014 Optisure Optical Hygrometer User s Manual APPLICATION SOFTWARE FIE T SSOOO Seriese Variables Editor DCC ZPeriod mins Output hold mins Reset optics Interval hh Frost assurance m Sensor to Manual m Logging Analogue output 1 Analogue o p 1 type Analogue o p 1 unit Analogue
24. to the right to decrease the scale size Dragging the mouse on the graph scrolls along the Y axis Scroll Y Drag down to scroll up Drag up to scroll down Name Description Dragging the mouse on the graph changes the scale of the Y axis Zoom Y Drag up to increase the scale size Drag down to decrease the scale size Zooms in on both axes in the user selected area Select a parameter from the legend on the right hand side of the graph Dragging the mouse along the graph will move the vertical cursor Show time Y along the time axis The Y value for the selected parameter at the position of the cursor will be displayed above the graph Displays the chart options window Copies the chart to the clipboard as a bitmap file Table 5 Graph Control Description Graph Plots the parameters selected by the user in the chart options window Status Bar Name Description O Z o o anim Indicates whether data acquisition is running paused or stopped with q the messages RUNNING PAUSED or IDLE not al Number of readings taken since starting the current acquisition session Next reading Countdown timer in seconds which indicates when the next reading countdown will be taken Log file Full path of the log file if specified Table 6 Status Bar Description Kahn Instruments 43 APPLICATION SOFTWARE Optisure Optical Hygrometer User s Manual 4 3 2 Variable Edit The variable edit mode allows
25. which will be applied otherwise physical injury to the operator or bystander is possible Before connection or disconnection of the instrument to and from the gas line itis essential to vent the system to atmospheric pressure otherwise severe injury could result The safety strap should be equipped when the the system is operating at pressures above 14 5 psig 1 barg see Section 2 5 10 Sample gas connections are made via the GAS IN port 7 and the GAS OUT port 8 located on the front panel of all the models As the method of connection is the same for all types only the horizontal version has been illustrated see Figure 13 Figure 13 Gas Connections 16 Issue 9 2 January 2014 Optisure Optical Hygrometer User s Manual INSTALLATION Both the input and output gas connections are 1 4 NPT Swagelock couplings The gas input connection must always be made via 1 4 stainless steel piping The gas output connection for most applications can just be exhausted to atmosphere via 305mm 12 of PTFE tubing 1 The method of connection to the GAS IN port 7 is as follows NOTE The following description relates to 14 tube fixings The instrument ports are both 1 4 NPT female fittings Two sets of tube fittings adaptor 6 front 5 and back 4 ferrules and locking nut 3 are supplied in the accessories box EU and CN v
26. 100 1 10 DIN class B 0 1 C x0 18 F 6 6ft 2m 820ft 250m max Temperature Measurement Measurement Accuracy Cable Length Typical 5 uncalibrated 0 to 1000ml min Integrated Pressure Sensor Optional 0 to 377 psia 0 to 25 bara Measurement Accuracy 0 25 Full Scale Measurement Accuracy Measurement Range Measurement Range Measurement Units psia bara KPa or MPag ZN CU gt 2 Uu ctr 3 D 2 cr Uu UI APPENDIX A Optisure Optical Hygrometer User s Manual User selectable to 0 001 dependant on parameter Meseurementtimts F and C for dew point and temperature JoRH g m g kg ppm ppm SF for calculated humidities Analog 3 channels user selectable 4 20 mA 0 20 mA or 0 1 V Digital PC Communications using Modbus RTU over USB Outputs Alarm Two volt free changeover contacts one process alarm one fault alarm 1 A 30 V DC High definition blue LCD HMI User adjustable contrast Menu navigation via five button keypad SD Card 512Mb supplied and USB interface Data Logging SD Card FAT 16 2Gb max that allows 24 million logs or 560 days logging at 2 second intervals Environmental Conditions 4 to 122 F 20 to 50 C Power Supply 85 to 264 V AC 47 63 Hz Power Consumption 100 VA EMC Class A Emissions l Industrial Location Immunity Complies with EN61236 1997 A1 A2 A3 Mechanical Specifications Vertical 17 5 x 7 9 x 13 8 445 x 200 x 350mm h xw xd 415mm 16
27. 3 deep when microscope is mounted Horizontal 7 3 x 17 3 x 18 8 185 x 440 x 350mm h xw xd 415mm 16 3 deep when microscope is mounted Vertical 23 7lb 10 75kg Horizontal 9 9kg 21 8lb Dimensions Weight Storage Temperature 40 to 140 F 40 to 60 C Calibration 3 point traceable in house calibration as standard 58 Issue 9 2 January 2014 Optisure Optical Hygrometer User s Manual Appendix B Formatting SD Cards Kahn Instruments APPENDIX B APPENDIX B Optisure Optical Hygrometer User s Manual Appendix B Formatting SD cards Before an SD card can be used for the storage of datalog results it must first be formatted Initially the card must be connected to a card reader which must in turn be connected to the host computer Most proprietary card readers connect to the host via a USB port Almost all laptop notebook PC s are eguipped with an SD card reader slot The formatting procedure is as follows Insert the card into the card reader and open Windows Explorer The card will be reported as Removable storage device Right click on the card icon and select Format from the pop up menu refer to Figure 43 The Format dialog box is now presented as shown in Figure 44 and the disk capacity is reported on the top line 1 This will depend upon the type of disk used 512 MB in this example In the File system box 2 Figure 44 select FAT In the Allocation unit size box 3 leave this set t
28. Analog 3 output minimum RW M J MNM3 31 001F Analog output configuration 1 Rw Bf OPSELCHON 32 0020 Analog output configuration 2 RAW B2 jOPSELECHON2 33 0021 Logging Interval LW LH LOG_INTERVAL 34 0022 Units Command KW LE UNITSCOMMAND 35 0023 Mirror Temp Set Point during DCC RAW M MIRROR TEMP SETP 0024 Emitter Drive amp LW H EMITTERDRIVE 37 0025 StabilityTime RW LH STABILITY_TIME 38 0026 RTCYea val Month val2 RW K YEARMONTH 39 0027 RTC Date valt Hours val2 RW K JjDAEHRS 40 0028 RTC Mins val1 Secs val RW Lk J MINSSCS 41 0029 Display Setting i amp KW LE DISPLAY SEITIGI 42 002A DispaySeting2 RW F DISPLAY SEITING2 43 oB NA h J J j LD0 44 oc NA 0 0 T p 4 002D NA J T 46 002E Filename DDMMorMMDD EI L FILENAME DDMM 47 002F FileaameHHMM 1 R CL ILENAME_HHMM 48 0030 Firmware Version Number R A mae 49 oos na 0 0 T 80 0032 NA 1 0 ll 51 Iowa 52 0034 Process Alarm Configuration Disp
29. D Optisure Optical Hygrometer User s Manual 15 14 13 12 1 109 8 7 6 5jJ4 3 2 1 0 Main Value to Log Display 3 MainValueto Log Displays 1 DP Temp Press and Flow are logged by default DP 00000000 Temp 00000001 ppm v 00000010 ppm v 00000010 ppm w sf6 00000011 ppm w sf6 00000011 g kg 00000100 g kg 00000100 g m 00000101 g m 00000101 pressure 00000110 pressure 00000110 flow 00000111 flow 00000111 rh 00001000 rh 00001000 temp difference 00001001 temp difference 00001001 Table 14 Register Configuration F Display Setting B 15 14 133 12 31 00 0 8 7 6 5 4 3 2 1 0 Unsigned Integer range 65535 Table 15 Register Configuration H 15 114 13 B i2 111 100 9 8 7 6 5 4 3 2 1 0 L Value gt Sign bit 1 for ve values signed int 7FFF 3276 7 SFFF 3276 8 The value in bits 15 to 0 1 is divided by 10 to give 0 1 resolution for dewpoint and temperature values Table 16 Register Configuration J 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 lt lt Val CCC Val2 Val1 amp 2 are in BCD therefore 10H 10 58H 58 and 09H 9 so as a result Ato F are not valid values Table 17 Register Configuration K 0 Issue 9 2 January 2014 Optisure Optical Hygrometer User s Manual APPENDIX D 15 14 133 12 31 00 0 8 7 6 5 4 3 2 1 0 lt lt Val1 gg af Val2 oS Values in
30. EE 12 2 5 4 Remote PRT Probe Optional zaadad nm 14 252 AANE GI CAE RE 15 2 5 6 USB Communications Port Connector s sssssssssssrssrnrnnrnsrnsnnrnnrnnrnrnnnnnnnrnnrnnnn 15 2 Conhectionof Gas SHUDBIBS SV a a IERI DTI a DIS MEO PUMUROE 16 2 5 8 Conversion of a Horizontal Version to Rack Mount eee 18 2 5 9 Fitting Rack Mounted Version into RACK uesoses sis a vas d 19 2 5 10 Fitting the Safety CLIC PPS PEN 20 a OPERON RE 21 3 1 Ge nerml Operational Te te Le 21 SG PUMCUCIK J Seansi mesiestei LU TTE 22 SCH Upand DOWN AMOWw KEYS E 22 3 2 2 Left and Right Arrow E 22 See Enter or Set Koy erer 22 2 5 ME N a das a a a du b cR LUd 23 Si Operational Data TIS MERERI T 24 2 944 Operational Status Display caus AE i TP DE EE 25 da MENU UCUN as mee 26 3 4 1 Oe AG Ga S O N NN N Men nn Ne 28 3 5 First Time Operation Operate Mode ccccseeccsecccsececsececseceseecuseecuseearseearsneatens 29 205 HEIEREN 30 3 6 1 DCC Dynamic Calibration CODE san mb nn 30 3 6 2 ive 9 a N SE A E E ass E a A AEE T E 32 3 6 3 STANDBY FURNCUO E Dmm mmm 33 3 6 4 ETOP Iis O D M 34 Bee Pressure ET E sies k sa es ai 36 30 Beete Wale be deg Olsenas sanes sue sims 36 3 9 FAST Frost Assurance Technology ss nm i 37 Dl EENI EE ee 38 Kahn Instruments Optisure Optical Hygrometer User s Manual e APFEI TIONSUFIV K Es D D REC Uia CDU EFI ME XUS KNIT 39 Fa LIELO is n m aun a 39 AA EEGENEN 39 4 2 1 VEC ONUN O eR 40 43 Data
31. For this reason the instrument can only be calibrated in an accredited standards laboratory If these facilities do not exist the instrument must be returned to the manufacturer Kahn Instruments If required for the calibration process the instrument s internal PRT can be made available for external connection as described in Section 3 10 The DCC function can be disabled for calibration purposes Refer to Section 3 6 1 A calibration certificate bearing a three point calibration is issued with each instrument If required an option is available to add further specific calibration points Contact Kahn Instruments for further information for contact information go to www kahn com MICHELL Instruments CERTIFICATE OF CALIBRATION The under mentioned item has been calibrated at the following points in the Michell Instruments Humidity Calibration Laboratory against Test Equipment traceable to the NATIONAL PHYSICAL LABORATORY Middlesex United Kingdom and to the NATIONAL INSTITUTE OF STANDARDS amp TECHNOLOGY Gaithersburg Maryland USA Certificate Number 54321 Ack Number A32123 Test Date 6 Nov 2012 Test Equipment Q0238 Instrument Serial Number 123456 Product Type S8000 Generated Instrument Display Instrument Display Dewpoint C Dewpoint C Correction C 59 4 59 0 10 30 6 30 0 00 Comments Calibration PASS The results are within specification at the measured points NOTE Traceability to National Physical
32. ION DURATION 12 nr OUTPUT HOLD 20 min SETPOINT 20 0 C RESET OPTICS Yes INTERVAL 04 00 h m DISPLAY HOLD DISPLAY HOLD OFF Figure 30 DCC Sub Menu Selection The value can be changed using the A up and Y down key To finish editing and accept the new value press the key DURATION ALARM DISPLAY HOLD OFF DISPLAY HOLD OFF DISPLAY HOLD Figure 31 Set Parameter Value To return to the SETUP menu from any part of the sub menu list press the 4 left key see Figure 31 To return to the MAIN menu from the SETUP menu press the 4 left key highlight EXIT and press the key 34 Issue 9 2 January 2014 Optisure Optical Hygrometer User s Manual OPERATION DCC LOGGING OUTPUT OUTPUT OUTPUT ALARM DISPLAY CLOCK ABOUT EXIT DURATION OUTPUT HOLD SETPOINT RESET OPTICS INTERVAL DISPLAY HOLD INTERVAL LOGGING FILENAME OP1 TYPE PARAMETER MIN MAX OP2 TYPE PARAMETER MIN MAX OP3 TYPE PARAMETER MIN MAX PARAMETER SETPOINT CONTRAST RESOLUTION PRIMARY UNIT PRESS UNIT LANGUAGE STABILITY TIME FAST PRT Software issue information Table 3 Duration of the DCC cycle Maximum output hold time after DCC No degrees heated above mirror temp Resets optics signal level during next DCC cycle Sets duration of MEASURE period before next DCC cycle If set to YES display readings are held during DCC amp HOLD period If set to NO display always
33. L Holcici Ie FILENAME gt a OP1 TYPE PARAMETER wax em OP2 TYPE PARAMETER gt a OP3 TYPE PARAMETER Pa PARAMETER SETPOINT Pa CONTRAST RESOLUTION PRIWARY UNT PRESS UNIT UNGUAGE STABILITY mme ABOUT PAGE H eech lt gt o Value Menu Items A Items eer Se Figure 22 Menu Structure Kahn Instruments 2 OPERATION Optisure Optical Hygrometer User s Manual 3 4 1 Operating Cycle The default parameters set up for the instrument define an operating cycle see Figure 23 Temp A miny Max 0 DCC HOLD DCC 2 min MEASURE e g 4 hrs Default 4 min Default Figure 23 Typical Operating Cycle At initial switch on the instrument enters a DCC cycle for 2 minutes This heats the mirror 36 F 20 C above the previously measured value at the time of switch on this will be 36 F 20 C above the ambient temperature This Insures that all moisture is driven off the surface of the mirror The mirror is maintained at this temperature for the DCC duration default 4 minutes or 2 minutes at switch on During the DCC process Data Hold fixes the analog outputs at the value s read before DCC commenced Data Hold typically lasts 4 minutes from the end of a DCC cycle or until the instrument is measuring a stable dew point This procedure is in place to prevent any system which is connected to the outputs from receiving a false reading After the
34. OOL Adp 041 P MAXCOOL Adp 0 4 Duration 03 03 22 Duration 02 03 22 SETUP Process ON SETUP Process ON i Fault OFF i Fault OFF Sensor CONTROL Sensor CONTROL Select Main Menu Select Option DCC ON Set DCC OFF Set DCC ON 0 Adp 0 1 Temperature 0 1 C Adp Status MEASURE 49 Status MEASURE Duration 03 03 18 Duration 02 03 18 Process ON Process ON 0 32 Im Eaut OFF 0 32 Vm Iran OFF Sensor CONTROL Sensor CONTROL Figure 26 DCC ON OFF Kahn Instruments 31 OPERATION Optisure Optical Hygrometer User s Manual 3 6 2 MAXCOOL Function The MAXCOOL function over rides the dew point control loop and applies maximum cooling drive to the Peltier heat pump It can be used e to determine what temperature the mirror can be driven down to with reference to the sensor body This temperature is indicated on the display e to determine whether or not the instrument is controlling at the dew point and whether it is able to reach it This situation could for instance arise when attempting to measure very low dew points where possibly due to a high ambient temperature the Peltier heat pump is unable to depress the temperature far enough to reach the dew point e to determine whether the instrument is controlling this can be checked by switching MAXCOOL on for a short period and then back to MEASURE This will depress the mirror temperature briefly and when it is switched back to MEASURE the control loop should b
35. Ww sf6 HiWod R N PPMWSEHI 10 000A PpmW s loWod R N PPMWSFIO 008 g mi HiWod R LN GGH 12 000C gimi loWod R LN Log Y 13 00D gkg HiWod R LN GGH 14 000E gKg lLoWyrd LEI LN Leen OF Flowvalue n LEI LH ROWRATE 16 0010 Mirror Condition LEI J MIRROR COND 17 0011 JHetPumpDrive R H HPDRVE _ 18 0012 status R D as 19 0013 DCC duration Hold Time Duration minutes R W K DCC HOLDTIME 20 0014 Measurement Time Hours Minutes RAW K MEASURE TIME 21 0015 PhaseTimeHours LEI H PHASE TIME HRS 22 0016 Phase Time Minutes Phase Time Seconds R K PHASE TIME MIN SEC 23 0017 Film thickness setting RAW LA FILM THICKNESS 24 0018 Live film thickness value R A LIVE FILM THICKNESS 25 0019 Analog 1 output maximum value R W M JMAXMAI 26 001A Analog 1 output minimum value RAW M J MINMM 27 001B Analog 2 output maximum value R W M JMAXM2Q 28 001C Analog 2 output minimum value RAW M MN MA2 29 001D Analog 3 output maximum value RW M MAXM3G 30 001E
36. able 17 Register ConNguratio Pans sv N E 70 Table 18 Red t F EO Le 1 E EE 71 Table 19 Redi ter Rennen Ted Lei E EE 71 Table 20 Register Configuration Neesam indie 71 Table 21 Regi ter nett Ted Tei P EEN 73 4 Issue 9 2 January 2014 Optisure Optical Hygrometer User s Manual Figures Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11 Figure 12 Figure 13 Figure 14 Figure 15 Figure 16 Figure 17 Figure 18 Figure 19 Figure 20 Figure 21 Figure 22 Figure 23 Figure 24 Figure 25 Figure 26 Figure 27 Figure 28 Figure 29 Figure 30 Figure 31 Figure 32 Figure 33 Figure 34 Figure 35 Figure 36 Figure 37 Figure 38 Figure 39 Figure 40 Figure 41 Figure 42 Figure 43 Figure 44 Figure 45 Figure 46 Figure 47 Figure 48 EPS elo bio qs ee s D I mm m 1 Operating FHRC l ns S A N 3 Optisure Optical Hygrometer PACKING uias aix sene ba eR veniam 4 Qe Pme co di TTC ERES 5 PC EE 8 Po gi zig EE 9 Fowo OPADU ee 10 Analog Output Connectors scsccececreceenenseenenuconsucensecserscuerecensesensesensneunaneas 11 A OUUU CODI vB NN N 13 KEMO ICT Bos eC e E 14 EE IED rene ere vs Kano ai N 15 EE ENEE 15 GS COME Bi S N S et M en eae eer 16 Conversion of Horizontal to Rack Mount ss 18 Raca TDTO PU ee 19 Removing the Blanking PIUG iss ss sez ss atent t 20 Fitting or Removing te Saretv ssnsdescdau 20 REDOR LEE At cmm 22 Typical Eegen 23 e e ij
37. achine Interface Hertz International Electrotechnical Commission normal liters per minute pound milliampere maximum minute s millivolt s normally closed normally open number parts per million by volume parts per million by weight Platinum resistance thermometer typically type Pt100 pound s per square inch gauge pound s per square inch absolute relative humidity Remote Terminal Unit standard cubic feet per hour storage device card memory card for storing datalog files temperature Universal Serial Bus Volts The following general warnings listed below are applicable to this instrument They are repeated in the text in the appropriate locations Where this hazard warning symbol appears in the following sections it is used to indicate areas where potentially hazardous operations need to be carried out Where this symbol appears in the following sections it is AN DANGER used to indicate areas of potential risk of electric shock Electric Shock Risk 8 Issue 9 2 January 2014 Optisure Optical Hygrometer User s Manual Page intentionally Ieft blank Kahn Instruments 9 Optisure Optical Hygrometer User s Manual INTRODUCTION 1 INTRODUCTION The Optisure Optical Hygrometer is a high precision instrument used for the measurement of moisture content in air and other gases Relative humidity and other calculated parameters based on dew point pressure and temperature of the sa
38. age Figure 19 shows a typical FRONT page display while the instrument is running in MEASURE Mode Dewpoint 11 46 x L Temperature X6 Adp 0 1 18 49 Status MEASURE Duration 00 14 22 Flow _ Process ON 0 A7 l min Fault OFF m Sensor CONTROL Figure 19 Typical Front Page Display The instrument display is divided into two sections Operational data measured or data calculated from measured parameters is shown in the three horizontal panes on the Ieft hand side Operational status information is shown in a separate display area on the right hand side Kahn Instruments 23 OPERATION Optisure Optical Hygrometer User s Manual 3 3 1 Operational Data Display Each of the three operational data panes can be configured to display one of the following parameters Dew point Temperature Water content ppm Water content ppm Water content g kg Water content g m Pressure see also Section 3 7 Flow rate Relative humidity RH E 9 x X xm xem d D d IL Temperature difference The parameters displayed are operator selectable and by default are set from the top of the display to Dew point Water Content ppm and Flow To change one of the displayed parameters follow the instructions below see Figure 20 1 Press the V down key to highlight the top pane 2 Use a combination of the W down and A up keys to highlight the required pane 3 Use a combination of the 4 lef
39. al Koch Safety strap Supplied with High Pressure versions If there are any shortages please notify Kahn Instruments immediately see www kahn com for contact information Figure 4 Optisure Accessories Kahn Instruments 5 INSTALLATION Optisure Optical Hygrometer User s Manual 2 3 2 3 1 2 3 2 Operating Reguirements Environmental Reguirements The horizontal and vertical Optisure instruments should be placed on a firm and level surface in a standard laboratory environment Recommended ambient temperature 68 to 77 F 20 to 25 C although the instrument will operate within specification at elevated ambient temperatures of up to 122 F 50 C providing the cooling vents are kept clear and unrestricted It is essential however that this upper temperature limit 122 F 50 C is not exceeded A free flow of air around the instrument is required at all times Rack mounted versions are suitable for mounting in standard 19 racks The siting of these racks should be in a dry dust free environment at a recommended ambient temperature of 68 to 77 F 20 to 25 C For rack mounted instruments forced air cooling of the rack should be considered if operating at high ambient temperatures Electrical Requirements All versions of the instrument require the following electrical supply e 85 to 264 V AC 47 63 Hz 100 VA max e Alarm outputs for all instrument types comprise two sets of cha
40. ayed The following sections explain how to establish communication with the Optisure Optical Hygrometer 58000 Series Application Software Communications Setup Communications Setup Choose a communication option To establish communications with the 58000 Series instrument please choose a communications method from the options below Manual select lt ComPort gt e Network Connection TCP Settings Status Idle Instrument Type 58000 r Save connection settings and skip this screen on start up Figure 32 Communications Setup Screen Kahn Instruments 39 APPLICATION SOFTWARE Optisure Optical Hygrometer User s Manual 4 2 1 USB Communication 1 Connect the Optisure Optical Hygrometer to the PC using the supplied USB cable 2 Windows will recognize the instrument and automatically install the relevant drivers If the driver installation has been successful then the Windows Device Manager Screen will list the following driver see Figure 33 3 Kahn Instruments USB to UART Bridge Controller d Launch the application software and choose one of the following types of connection 5 Auto Detect The application software will attempt to find the correct COM port automatically 6 Manual Choose the appropriate COM port from the drop down list as shown in the Windows Device Manager Screen 7 Click the OK button to proceed to the next screen gt Device Manager File Action View Help m
41. be off If the optics or the mirror contamination exceeds 100 of the film thickness or if a fault exists on the Pt100 the alarm is triggered and the relay contacts will change state This fault is also reported to the status area of the display The two alarm output ports are connected to the instrument via a single 6 way push fit connector block as shown in Figure 9 Each output comprises a 3 wire set of potential free change over relay contacts Each contact set is labelled COM common 0 V N O normally open with respect to COM and N C normally closed with respect to COM To differentiate between the alarm output channels it is recommended that a black lead be used for each of the COM common lines and a separate color for each of the N O and N C lines 12 Issue 9 2 January 2014 Optisure Optical Hygrometer User s Manual INSTALLATION A N WARNING Alarm leads MUST be potential free when wiring DANGER to connector block Electric Shock Risk Figure 9 Alarm Output Connectors For each output 1 Strip back the wire for the common black connection to the COM connector way for the FAULT alarm contact set exposing approximately 6mm 0 25 wire and clamp into the screw block COM terminal way Do not overtighten the screw 2 Strip back the wire for the N O e g green connection to the N O connector way for the FAULT alarm contact set exposing appro
42. ction 3 6 3 48 Issue 9 2 January 2014 Optisure Optical Hygrometer User s Manual MAINTENANCE 5 4 1 Fitting the Microscope Optional WARNING The microscope must not be eguipped when the instrument is operating at pressures higher than 14 5 psig 1 barg To observe the frost formation on the chilled mirror surface an optional microscope Part No S8K MCI can be provided The microscope allows direct viewing of the mirror surface providing assurance that ice crystals have formed and that supercooled water is not present at temperatures below 32 F 0 C When the instrument is controlling at a dew point condensation is seen as small bright red specks against a dark background Liquid water is seen as rounded droplets and ice as sharp edged crystals On both standard models the microscope is equipped as follows refer to Figure 40 1 Pulloutthe blanking plug 1 or remove safety strap see Section 2 5 10 from the sensor housing 2 Initially screw the microscope unit 2 into the sensor housing until about 6 threads remain showing 3 Ifthe instrument is not operating switch it ON and rotate the microscope body until the mirror surface is brought into sharp focus Two or three extra turns either way are usually sufficient d To prevent stray light effects always replace the blanking plug or safety strap after removing the microscope refer to Section 2 5 10 PON ALZ va WV Figure 40 Installi
43. d game controllers D M System devices n Universal Serial Bus controllers Ms Michell Instruments USB Composite Device i gt SafeNet USB SuperPro UltraPro gt Standard Enhanced PCI to USB Host Controller gt Standard OpenHCD USB Host Controller e USB Composite Device lt USB Root Hub P USB Root Hub Il Figure 47 Device Manager Screen 76 Issue 9 2 January 2014 Optisure Optical Hygrometer User s Manual APPENDIX E To communicate with the Optisure the software needs to know which communications USB port the Optisure is connected to On first launch the software will ask for the communications port number which can be either automatically detected or manually selected A screen shot of the communications window is shown below 8000 application software communications setup x Choose a communication port number Before you can communicate with the S94 you need to choose a communication port number This can be done automatic ally or manually Select the method from the options below Status Idle OK Use this port amp skip this screen everytime Figure 48 Communications Window Clicking Auto detect will prompt the software to search for the USB driver in Windows Device Manager From that it will determine which USB port the Optisure is connected to and establish a connection automatically Manual selection of a communications port is provided in the unlik
44. de the instrument typically on the GAS IN side for atmospheric measurements by means of a precision needle valve Always use high quality valve gear coupling connections and pipework Avoid pressure gradients in the system by placing excessive flow restriction on the GAS OUT side of the system In applications where the test gas has a very high flow rate an instrument by pass arrangement is preferable to a flow restrictor after the sensor 50 Issue 9 2 January 2014 Optisure Optical Hygrometer User s Manual GOOD MEASUREMENT PRACTICE 6 1 Sampling Hints Measurement of moisture content is a complex subject but does not need to be difficult This section aims to explain the common mistakes made in measurement situations the causes of the problem and how to avoid them Mistakes and bad practices can cause the measurement to vary from the expectation therefore a good sampling technique is crucial for accurate and reliable results Transpiration and Sampling Materials nylon NS Dew point 9C polyethylene nickel PTFE stainless steel 1 2 3 4 5 Time hours All materials are permeable to water vapor as the water molecule is extremely small compared to the structure of solids even when compared to the crystalline structure of metals The graph above shows the dew point inside tubing of different materials when purged with very dry gas where the exterior of the tubing is in the ambient environment Many materials co
45. de variety of clean non corrosive gases It will not contaminate high purity gases and is safe for use in critical semi conductor and fiber optic manufacturing applications Kahn Instruments 21 OPERATION Optisure Optical Hygrometer User s Manual 3 2 3 2 1 3 2 2 3 2 3 Function Keys The function keys located below the display on all models are used to select operations from the MAIN menu level to enter sub menu levels and to select and enter parameter variables within those menu levels Figure 18 Function Keys The SD card reader used for data storage during data logging operations is located below the function keys Up and Down Arrow Keys A V The A up and Y down keys are used to scroll through menus and adjust values Left and Right Arrow Keys lt gt The 4 left and P right keys are used to scroll through alternative parameters within the highlighted panes on the FRONT page The 4 left key is also used to step back one menu level Enter or Select Key The enter key is used to move from one sub menu down to the next level The enter key is also used to select highlighted options in order to change parameter variables within these options 22 Issue 9 2 January 2014 Optisure Optical Hygrometer User s Manual OPERATION 3 3 Instrument Display For all models of the instrument the display and the associated function keys form the operator interface FRONT P
46. e PRT output binding posts see Section 2 5 5 Remove the connections to the GAS IN and GAS OUT ports see Section 2 5 7 Pack the instrument in its original case as shown in Figure 42 NOTE The accessories should be packed in the box 4 Unless returning for repair it is not necessary to return either the microscope or the analog and alarm connectors All cables and the remote PRT probe if supplied should be returned for checking Enclose a packing list detailing all equipment contained in the box and seal the box Ideally for extra security the box should be banded Side packing Optisure Instrument Side packing Accessories box Carton Figure 42 Instrument Packing Details Kahn Instruments APPENDIX A Optisure Optical Hygrometer User s Manual Appendix A Technical Specifications 56 Issue 9 2 January 2014 Optisure Optical Hygrometer User s Manual APPENDIX A Appendix A Technical Specifications Dew Point Sensor Performance Measurement Technology Chilled Mirror Operating Temperature 4 to 122 F 20 to 50 C Range 76 to 104 Fdp 60 to 40 Cdp Optisure Measurement Range Measurement Range Dew point Cdp 10 20 30 Sensor Body Temperature Low Pressure versions to 14 5 psig 0 to 1 barg High Pressure Version 0 to 250 psig 0 to 17 barg 0 2 to 2 1 scfh 0 1 to 1 Nl min Temperature regulated emitter with dual optic detection Remote PRT Probe Optional 4 wire Pt
47. e able to stabilize the mirror temperature at the dew point again Figure 27 shows the method of switching the MAXCOOL facility ON and OFF MAXCOOL ON SEQUENCE MAXCOOL TO MEASURE SEQUENCE Pressure Pressure Adp 0 1 Adp 0 1 1 Bara ctatus MEASURE 1 Bara Status STANDBY Duration 02 03 25 Duration 01 02 02 Water Content Process ON Water Content Process ON 10 32 gm raut OFF 10 32 9m Fault OFF Sensor CONTROL CONTROL Sensor Qo Select Main Menu Qo Select Main Menu Select Option Select Option MAXCOOL MEASURE Dewpoint Dewpoint Pressure Pressure MAXCOOL Ad 0 1 MEASURE Adp 0 1 Pado poi DEE Duration 02 03 22 Duration 00 59 19 Fault OFF OFF Sensor CONTROL CONTROL Qo Set MAXCOOL Dewpoint M 11 46 P P ressure SE Adp 0 1 ressure Ni 0 1 1 Status MAXCOOL 1 Status MEASURE Duration 02 03 16 Duration 00 59 03 Water Content Process ON Water Content Process ON 10 32 om Faut OFF 10 32 gm raut OFF L Sensor CONTROL CONTROL Sensor Figure 27 Switching MAXCOOL and MEASURE Mode 32 Issue 9 2 January 2014 Optisure Optical Hygrometer User s Manual OPERATION 3 6 3 STANDBY Function This function is used for applications where the dew point of the sample gas changes very guickly from dry to wet creating conditions which may cause the sensor to saturate Alternatively it may be used in applications reguiring infreguent manual measurements to be taken where it is preferable to have the
48. ely event that the software cannot auto detect it NOTE Upon successfully establishing communication record the port number and in future skip this window by ticking the Use this port amp Skip this screen every time option Once communications have been established click the OK button to go to the Options window The latter provides two choices Data acquisition and Edit variables Choose either Data acquisition if continuous charting display and logging of instrument readings is required or Edit variables if only the editing of instrument variables configuration is required Kahn Instruments 77 APPENDIX F Optisure Optical Hygrometer User s Manual Appendix F EC Declaration of Conformity 78 Issue 9 2 January 2014 Optisure Optical Hygrometer User s Manual APPENDIX F Appendix F EC Declaration of Conformity MICHELL Instruments EC Declaration of Conformity Manufacturer Michell Instruments Limited 48 Lancaster Way Business Park Ely Cambridgeshire CB6 3NW UK declare under our sole responsibility that the product 8000 Integrale complies with all the essential reguirements of the EC directives listed below 2004 108 EC EMC Directive 2006 95 EC Low Voltage Directive LVD and has been designed to be in conformance with the relevant sections of the following standards or other normative documents EN61326 1 2006 Electrical equipment for measurement control and laboratory use
49. ersions are supplied with 6mm fittings and NA fittings are 1 4 Other fittings 3mm and Vs are also available to order 1 Cut stainless steel tubing 2 to the correct length and if necessary bend to shape to suit the location of the instrument NOTE To facilitate ease of connection to the port at least 3 75mm of the tubing coming out of the GAS IN port should be straight 2 Clean off any burrs or metal shavings adhering to the tubing 3 Screw the 1 4 NPT Swagelok adaptor 6 into the 1 4 NPT inlet port of the instrument and tighten Wrap the NPT male thread in one layer of PTFE tape to facilitate a gas tight seal CAUTION Do not overtighten 4 Pass the tubing 2 through the locking nut 3 NOTE Threads towards the gas port 5 Fit the back ferrule 4 over the tubing 2 with the bevelled end facing the back of the front ferrule 5 6 Place the front ferrule 5 over the tubing 2 bevelled end towards the adaptor 6 7 Push the tubing as far as it will go into the fitting and tighten up the locking nut 3 finger tight 8 Hold the adaptor 6 flats with a wrench and tighten up the locking nut 3 This action compresses the front ferrule 5 and back ferrule 4 onto the tubing to form a gas tight seal CAUTION Do not overtighten as this could cause the ferrules to crack and destroy the integrity of the seal 9 Connect up the GAS OUT port 8 in a similar manner to that described in operat
50. ffers two way communication between a host PC known as the master unit and one or more instruments Known as slave units Once communication is established by the master unit reading or writing to holding registers within an addressed slave unit is possible The master unit can obtain measured values and status information by reading registers and can respond to data contained within these registers by writing back The tables in this Appendix list these registers as they apply to the Optisure instrument and specify the number and data formats that apply to each register Basic Modbus Operation There are two possible Modbus transmission modes ASCII and RTU Remote Terminal Unit The Optisure instrument is classed as an RTU Communication between a host system e g PC operates on a Query Response Cycle see Figure 46 where a specific Modbus function code embedded in the query message tells the addressed slave device what actions to perform using the information contained in the data bytes An error checkfield provides a method for the slave to validate the integrity of the message contents If the slave makes a normal response the function code in the response is an echo of the function code in the query and the data bytes will contain data collected by the slave e g holding register values or status information If an error occurs the function code is incremented by 80H most significant bit set to 1 to indicate that the
51. g diode 1 see Figure 2 provides a light beam of constant intensity which is focused by a lens system 2 to become the incident beam on the mirror surface 3 flooding it with a pool of light Before the light beam reaches the mirror 3 a beam splitter 4 directs part of the beam via a lens system 5 onto a sensor 6 which monitors the intensity of the LED light and provides a feedback loop to keep this at a constant level Two sensors 7 and 8 monitor the light level reflected by the mirror One of these sensors 7 measures the light level due to the reflected incident beam and the other 8 measures the degree of light scatter due to the formation of water ice on the mirror surface Each sensor has its own optical lens system 9 and 10 to concentrate the reflected light onto the sensor The output from each of these sensors is compared and then used to control the drive to a Peltier heat pump 11 Dependant on the result of this comparison the control system will cause the heat pump 11 to either heat or cool the mirror 3 in order to maintain the desired condensation film thickness on the mirror surface At an equilibrium point where the evaporation rate and condensation rate at the surface of the mirror are equal the mirror temperature read by a Pt100 platinum resistance thermometer 12 embedded in the mirror represents the dew point Issue 9 2 January 2014 Optisure Optical Hygrometer User s Manual INTRODUCTION
52. g it up and changing the default parameters should this become necessary Before operating the instrument read this section which describes the operation of the instruments controls and explains the display functions in detail Prior to operation the instrument must have been connected to a sample gas supply as detailed in Section 2 5 7 the correct electrical power supply and the relevant analog and alarm outputs connected to external systems as described in Section 2 On delivery the instrument will have been set up with a standard set of default parameters defining the operation of the instrument These parameters can be changed as required by means of the SETUP Menu refer to Section 3 6 4 General Operational Information Operation of the Optisure hygrometer is completely automatic and once set up for a measurement cycle requires little or no operator intervention While the instrument can physically operate in a flowing gas stream of between 0 6 and 2 1 scfh 0 3 and 1 Nl min Kahn Instruments recommends operating at 1 06 scfh 0 5 NI min which is the flow rate used during calibration Operating at an alternative rate could impact the instrument s response time For all applications the sample gas is taken into the instrument via the GAS IN port located on the front panel from where it passes into a sample chamber The gas flow rate is then measured on the exhaust side of the sample chamber prior to being exhausted from the ins
53. gerci eds TE 65 D 2 Basic Modbus Operation a i FUP qM nds 65 D 3 Modbus RTU Connections and Protocol hin rn yi rk Re s 66 D 4 Resa mc c Y 66 Appendix E Installation of the Application Software 2 eere 75 Appendix F EC FEELEN 79 6 Issue 9 2 January 2014 Optisure Optical Hygrometer User s Manual Safety The manufacturer has designed this eguipment to be safe when operated using the procedures detailed in this manual The user must not use this eguipment for any other purpose than that stated Do not apply values greater than the maximum value stated This manual contains operating and safety instructions which must be followed to insure the safe operation and to maintain the eguipment in a safe condition The safety instructions are either warnings or cautions issued to protect the user and the eguipment from injury or damage Use gualified personnel and good engineering practice for all procedures in this manual Electrical Safety The instrument is designed to be completely safe when used with options and accessories supplied by the manufacturer for use with the instrument The input power supply voltage limits are 85 to 264 V AC 47 63 Hz Refer to Appendix A Technical Specifications Pressure Safety Before pressurizing the user must insure through appropriate protective measures that the system or the device will not be over pressurized When working with the instrumen
54. he assembly back onto the fan housing until it clips into position 5 4 Sensor Mirror Cleaning WARNING Before removing the safety strap or opening the sensor housing it is essential to vent the system to atmospheric pressure otherwise severe injury or damage to the equipment could result Figure 39 Mirror and Optics Cleaning The cleaning procedure is as follows 1 Switch the equipment to STANDBY mode refer to Section 3 6 3 and allow sufficient time for the sensor to rise towards ambient temperature NOTE DO NOT clean the mirror while its temperature is below zero otherwise the Q tip will stick to the surface of the mirror refer to the display for mirror temperature 2 Remove the safety strap see Section 2 5 10 3 Open the sensor housing to gain access to the mirror 4 Soak a Q tip in isopropyl alcohol and gently clean the surface of the mirror To prevent scratching of the mirror surface avoid pressing too hard on the O tip bud 5 A Allow the isopropyl alcohol solvent to evaporate off 6 Clean the quartz window in the sensor cover with a fresh Q tip bud 7 Check that the O ring seal 1 in the sensor housing is not damaged If in doubt remove and replace it NOTE The integrity of the pressure seal between the sensor cover and the casing depends upon this O ring seal 8 Close the sensor cover and lock it into position 9 Cancel STANDBY mode and return the instrument to MEASURE mode Refer to Se
55. his time variable Stability Time is set up within the DISPLAY option of the SETUP Menu refer to Section 3 6 4 2 A dp value represents the change in dew point over the stability duration as shown on the graph 3 Status indicator reports which operational phase the instrument is currently in This will be either DCC HOLD MEASURE or MAXCOOL 4 Duration indicator reports back the time in Hours Minutes Seconds format remaining in the phase currently being displayed in the Status indicator 5 Process this two state ON OFF notification indicates whether a parameter process alarm is either ON or OFF A process alarm can be set on any parameter and its set point The ON OFF control is set up via the SETUP Menu refer to Section 3 6 4 6 Fault used to monitor the optical system and the degree of mirror contamination During normal operation when there are no fault conditions this will read OFF It will be set to ON if there is either a fault with the optics or dp temperature measurement or if the mirror contamination exceeds 100 of the film thickness indicating that the mirror needs to be cleaned Refer to Section 5 4 for mirror cleaning 7 Sensor indicates the operational mode of the sensor This can be either CONTROL HEATING or COOLING Kahn Instruments 25 OPERATION 3 4 Menu Structure The Optisure has a three level menu structure the top level of which MAIN Menu is accessed from the FRONT page by
56. ighly effective alternative to a coalescing filter It provides protection from liquid droplets and can even stop flow to the analyzer completely when a large slug of liquid is encountered Condensation and Leaks A y V U vo U F 0 9 3 V e lo F mm a o 9 vo OG De Dewpoint gt T Dewpoint lt T Maintaining the temperature of the sample system tubing above the dew point of the sample is vital to prevent condensation Any condensation invalidates the sampling process as it changes the water vapor content of the gas being measured Condensed liquid can alter the humidity elsewhere by dripping or running to other locations where it may re evaporate The integrity of all connections is also an important consideration especially when Sampling low dew points at an elevated pressure If a small leak occurs in a high pressure line gas will leak out but vortices at the leak point and a negative vapor pressure differential will also allow water vapor to contaminate the flow 52 Issue 9 2 January 2014 Optisure Optical Hygrometer User s Manual GOOD MEASUREMENT PRACTICE Flow Rates Theoretically flow rate has no direct effect on the measured moisture content but in practice it can have unanticipated effects on response speed and accuracy The optimal flow rate varies depending on the measurement technology and can always be found in the instrument or sensor manual An inadeguate flow rate can e Accentuate adsor
57. iguration of these outputs i e parameter represented output type current loop or voltage and upper lower span levels are set up via the SETUP Menu Screen refer to Section 3 6 4 These signals may be used to control external systems During a DCC cycle and for the hold period following a DCC cycle they are held at the level that they were at immediately prior to the start of the cycle When the dew point measurement is stable or if the maximum hold period has expired they are released and will track the selected parameter throughout the measurement cycle The default settings of these analog outputs are Channel 1 Dew point 60 to 40 C Channel 2 ppm 0 to 3000 Channel 3 Flow 0 to 1000 ml min NOTE The analog outputs are only active during the MEASURE phase They will therefore be off after switch on and remain off until the system enters the MEASURE phase The three analog output ports connections are made via a single 6 way push fit connector block as shown in Figure 8 All outputs are 2 wire positive going signals referenced to a common 0 V line To differentiate between the outputs it is recommended that a black lead be used for each of the COM common lines and a separate color for each of the positive lines Figure 8 Analog Output Connectors Kahn Instruments 11 INSTALLATION Optisure Optical Hygrometer User s Manual For each output 1 Remove the
58. ine measurement and monitoring pressure of the sample gas The pressure measured by this sensor is then used internally as the basis for compensation for the calculation of all the pressure related parameters ppm ppm g m and g kg If a pressure transducer is not equipped 101 3 kPa is used as the basis of all these calculations The internal pressure transducer is ranged 0 to 377 psia 0 to 25 bara The displayed pressure units can be changed from the Display sub section of the Setup Menu The option PRESS UNIT can be set to psia bara KPa or MPag Logging Function WARNING Insure logging is stopped through the Logging Menu before powering off the instrument or all logged data will be lost The LOGGING function provides the facility to log at operator specified intervals real time values of all the instruments parameters and to store these logged results on an SD memory card To set up this facility proceed as follows 1 Select SETUP from the MAIN menu and press the key to display the SETUP menu 2 Press the W down key to highlight LOGGING and press the key twice to enter e g the INTERVAL field 3 Usethe A up and Y down keys to set the required INTERVAL duration and press the key 4 Insert a formatted SD card in the slot immediately below the function keys Refer to Appendix B for details on formatting an SD card 5 Press the W down key to highlight LOGGING and press the key to enter the
59. ing a rack mount instrument into a standard 19 rack To fit the unit proceed as follows Da Del A gt ei A i Figure 15 Rack Mounting Method 1 Remove the connector blocks from the alarm and analog output sockets 2 If necessary remove any covers from the rack cabinet to gain access to the rear and side 3 Connect up the analog and alarm output connector blocks to the internal rack wiring refer to Section 2 5 ensuring that there is sufficient free cable to permit withdrawal of the instrument from the rack 4 Slide the instrument into the rack and support its weight while the four fixing screws are inserted 5 Insure that the front panel of the instrument is flush and square with the front of the rack and tighten the fixing screws 6 Insert the analog and alarm connectors into their respective sockets on the rear of the instrument refer to Section 2 5 and connect the external PRT probe and USB communications cable and connector as appropriate 7 Connect the power supply cable and switch the ON OFF switch to ON 8 Refit any covers to the rack as necessary To remove from the rack follow the directions above in reverse Kahn Instruments 19 INSTALLATION Optisure Optical Hygrometer User s Manual 2 5 10 Fitting the Safety Strap WARNING A safety stra
60. ing facilities This protocol offers two way communication between a host PC known as the master unit to one or more instruments termed slave units Once communication is established by the master unit reading or writing to holding registers within an addressed slave unit is possible The master unit can obtain measured values and status information by reading registers and can respond to data contained within these registers by writing back The following tables list these registers as they apply to the Optisure instrument and specify the number and data formats that apply to each register A copy of the application software can be found on the CD delivered with the instrument or downloaded from http www kahn com uk support sware downloads htm 1 Double click the zip file to open the Optisure application software and launch the Optisure exe file Follow the set up procedure 2 Select the language to be used during the installation 3 Exit all other Windows programs before running the Setup program 4 Accept the licensing agreement 5 The System information window will specify whether or not the PC meets or exceeds the minimum requirement for Optisure application software 6 Enter the following authorization code 7316 MIL1 8000 7 Amend the destination directory if desired The default directory is C Program Files Optisure Application Software 8 Select the program folder The default program folder is Kahn Inst
61. int as possible in order to obtain a truly representative measurement The length of the sample line to the sensor or instrument should be as short as possible Interconnection points and valves trap moisture so using the simplest sampling arrangement possible will reduce the time it takes for the sample system to dry out when purged with dry gas Over a long tubing run water will inevitably migrate into any line and the effects of adsorption and desorption will become more apparent It is clear from the graph shown above that the best materials to resist transpiration are stainless steel and PTFE Trapped Moisture Dead volumes areas which are not in a direct flow path in sample lines hold onto water molecules which are slowly released into the passing gas this results in increased purge and response times and wetter than expected readings Hygroscopic materials in filters valves e g rubber from pressure regulators or any other parts of the system can also trap moisture Sample Conditioning Sample conditioning is often necessary to avoid exposure of sensitive measuring components to liquids and other contaminants which may cause damage or affect the accuracy over time depending on the measurement technology Particulate filters are used for removing dirt rust scale and any other solids that may be in a sample stream For protection against liquids a coalescing filter should be used The membrane filter is a more expensive but h
62. ions 1 8 above using PTFE tubing 1 in place of stainless steel 2 Kahn Instruments 17 INSTALLATION Optisure Optical Hygrometer User s Manual 2 5 8 Conversion of a Horizontal Version to Rack Mount To convert a Optisure horizontal version to a rack mounted version a rack mounting kit Optional Part No S8K PKI is reguired This conversion pack comprises two steel wings 3 and eight cap screws 1 each wing bolting to the side of the instrument with four screws as shown in Figure 14 Figure 14 Conversion of Horizontal to Rack Mount 1 Turn the unit on its left hand end and line up the fixing holes on the right hand side of the instrument with the corresponding holes in the right hand wing flange facing outwards 2 Insert the four cap screws 1 and washers 2 through the wing 3 and tighten finger tight 3 Insure that the front flange 3 is square to the front of the instrument and tighten the cap screws 4 Turn the unit on its right hand end and repeat operations 1 3 To remove the rack support wings remove the unit from the rack if necessary and follow the directions above in reverse 18 Issue 9 2 January 2014 Optisure Optical Hygrometer User s Manual INSTALLATION 2 5 9 Fitting Rack Mounted Version into Rack Figure 15 illustrates the method for fitt
63. lay Contrast R W P ALARMCONFIG_DISPCONT_ 53 0035 Process Alarm Set port R W M jPROCESSALARM SP HI Table 7 Modbus Holding Register Map Kahn Instruments 67 APPENDIX D Optisure Optical Hygrometer User s Manual 155 14 13 2 131 jao 9 8 7 e s 4 s 2 t o L Value Sign bit 1 for ve values signed int 7FFF 327 67 8FFF 327 68 The value in bits 15 to 0 1 is divided by 100 to give 0 01 resolution for dewpoint and temperature values Table 8 Register Configuration A 15 14 13 12 1 10 9 8 7 6 5 4 3 2 1 0 Analogue O P 2 Analogue O P 1 AndoguOPP2 X AnadogueOP1 DP 00000000 DP 00000000 Temp 00000001 Temp 00000001 ppm v 00000010 ppm v 00000010 ppm w sf6 00000011 ppm w sf6 00000011 g kg 00000100 g kg 00000100 g m 00000101 g m 00000101 pressure 00000110 pressure 00000110 flow 00000111 flow 00000111 rh 00001000 rh 00001000 temp difference 00001001 temp difference 00001001 Table 9 Register Configuration B1 Analogue O P 3 DP 00000000 Temp 00000001 ppm v 00000010 ppm w sf6 200000011 g kg 00000100 g m 00000101 pressure 00000110 flow 00000111 rh 00001000 temp difference 00001001 0 20mA 0 20mA 0 20mA e a O o O 9 E lt 01 4 20mA 0 1V 10 Analogue O P 2 00 01 4 20mA 0 1V 10 Analogue O P 1 00 01 4 20mA
64. mple gas can also be displayed The Optisure Optical Hygrometer is capable of measuring dew points as low as 60 C 76 F it can measure dew points up to but not including the point of condensation maximum 40 C 104 F Four models of the Optisure Optical Hygrometer instrument are available e Vertical model e Low Pressure 14 5 psig 1 barg max o High Pressure 250 psig 17 barg max Horizontal model e Low Pressure 14 5 psig 1 barg max o High Pressure 250 psig 17 barg max A rack mounted configuration is available which is a derivative of the horizontal model Any horizontal model may be converted to a rack mounted version by means of a special rack mounting kit refer to Section 2 5 8 Figure 1 Optisure Horizontal Model Kahn Instruments 1 INTRODUCTION Optisure Optical Hygrometer User s Manual 1 1 Operating Principle The system operates on the chilled mirror principle whereby a gas sample is passed into the sensor housing and flows over the surface of the chilled mirror contained within At a temperature dependent upon the moisture content in the gas and the Operating pressure the moisture in the gas condenses out on the surface of the mirror An optical system is used to detect the point at which this occurs and this information is used to control the mirror temperature and maintain a constant thickness of the condensation layer on the mirror surface A light emittin
65. ng the Microscope Kahn Instruments 49 GOOD MEASUREMENT PRACTICE Optisure Optical Hygrometer User s Manual 6 GOOD MEASUREMENT PRACTICE The Optisure is designed to operate in a flowing gas stream The sampling chamber which enables a small sample of gas to be passed over a Peltier chilled plated copper mirror is designed to operate at pressures up to 14 5 psig 1 barg low pressure version and up to 250 psig 17 barg max high pressure version For many applications the sample chamber operates at atmospheric pressure with the sample gas being exhausted to atmosphere The sensor is designed for operation with flow rates of 0 6 and 2 1 scfh 0 3 and 1 NI min although it will operate successfully at flow rates as low as 0 2 scfh 0 1 Nl min It is important to insure that the flow rate through the sample line connecting the source to the Optisure is high enough to avoid log time lags in response to humidity changes at the sample source Ideally therefore the flow rate should be set between 0 6 and 2 1 scfh 0 3 and 0 7 Nl min 1 06 scfh 0 5 Nl min 0 4 scfh 40 2 Nl min being the recommended optimum For flow regulation purposes by default the FRONT page is configured to read FLOW Should the FRONT page not be showing FLOW Section 3 3 1 details the method of setting up the instrument to display this parameter Flow regulation is not provided within the Optisure instrument Gas flow must therefore be regulated outsi
66. ngeover relay contacts one set for a PROCESS alarm and one set for an INSTRUMENT FAULT Both sets of contacts are rated at 24 V 14 NOTE THIS RATING MUST NOT BE EXCEEDED Issue 9 2 January 2014 Optisure Optical Hygrometer User s Manual INSTALLATION 2 4 Exterior Layout The controls and indicators relating to the operator interface are located on the front panel along with the gas inlet and outlet The external PRT connection power IEC socket analog output connector remote temperature probe connector alarm relay connector and the USB socket are located on the rear panel Figures 5 and 6 show the layout of these controls for both the rack mount horizontal and vertical versions of the instrument Tables 1 and 2 detail the controls and indicators and the function key operations The microscope should not be used when the system is operating at pressures above 14 5 psig 1 barg The safety strap should be installed when the the system is operating at pressures above 14 5 psig 1 barg see Section 2 5 10 Kahn Instruments 7 INSTALLATION Optisure Optical Hygrometer User s Manual Front Panel TM TM J Wu u MM M pa 6 Figure 5 Front Panel jem peseriptiom 1 Microscope For viewing mirror surface The microscope is removable
67. nsuring a guaranteed frost formation The mirror temperature is then increased to above the initial measured dew point but maintained below 32 F 0 C and the excess condensate driven off the mirror The system then controls for dew point based on the frost formation Once ice has formed it will remain as ice until the temperature is raised above 32 F 09C This means that the state of the condensate on the mirror must be a frost formation and the dew point of the gas can be measured with increased accuracy and reliability If required the instrument s FAST function can be switched on and off from the Display option in the SETUP menu Kahn Instruments 3 OPERATION Optisure Optical Hygrometer User s Manual 3 10 External PRT If required either for the calibration process or for external monitoring the instruments internal PRT can be made available for external connection as follows 1 Select SETUP from the MAIN menu 2 Use the Y down key to select DISPLAY from the SETUP menu 3 Press the key to enter the DISPLAY option and then use the W down key to highlight PRT 4 Press the key to enter the PRT parameter field and use either the A up or Y down key to change the parameter field to EXT NOTE The instrument must be in a MEASURE phase not DCC or DATAHOLD 5 Press the key to set the PRT to EXT NOTE When set to EXT PRT mode DCC is inhibited the dew point temperature display will read 0 00 and the s
68. ntain moisture as part of their structure particularly organic materials natural or synthetic salts or anything which contains them and anything which has small pores It is important to insure that the materials used are suitable for the application If the partial water vapor pressure exerted on the outside of a compressed air line is higher than on the inside the atmospheric water vapor will naturally push through the porous medium causing water to migrate into the pressurized air line This effect is called transpiration Adsorption and Desorption Adsorption is the adhesion of atoms ions or molecules from a gas liquid or dissolved solid to the surface of a material creating a film The rate of adsorption is increased at higher pressures and lower temperatures Desorption is the release of a substance from or through the surface of a material In constant environmental conditions an adsorbed substance will remain on a surface almost indefinitely However as the temperature rises so does the likelihood of desorption occurring In practical terms as the temperature of the environment fluctuates water molecules are adsorbed and desorbed from the internal surfaces of the sample tubing causing small fluctuations in the measured dew point Kahn Instruments 51 GOOD MEASUREMENT PRACTICE Optisure Optical Hygrometer User s Manual Sample Tubing Length The sample point should always be as close to the critical measurement po
69. o Default allocation size If reguired in the Volume label box 4 enter a volume label e g Optisure The SD card requires a full format so leave the Ouick format box 5 unchecked Click the Start button 6 The message Figure 45 will now appear Click OK to proceed 58000 G File Edit View Favorites Tools Help G Bak J d E Search Folders zi 3 My Computer F H 315 Floppy A Se Local Disk i OO ADOBE co Explore GG Brothe Open B Docum Search C3 Drivers IGO Helen c Legacy i mwas EM o 23 Progra 23 Project pe CO PSFON ID wINDC S Local Disk i My Disc E amp LH Audio CD 2 reg tl CT Collapse AutoPlay Sharing and Security E E Scan Cut Copy RI B RR EH Rename Properties 18 objects 7 17 MB W My Computer Figure 43 Select Format 1 Format B000 gt K A cnp bs ri Sei E Ee Ten E E PES vi d Akwen unit cime Cont sm scc a ipii Label m Forex gprs L auick Parma Sat kr Figure 44 Set Format Properties Format 8000 G A WARNING Formatting will erase ALL data on this disk To Format the disk click OK To quit click CANCEL Cancel Format Disc Figure 45 Issue 9 2 January 2014 Optisure Optical Hygrometer User s Manual Appendix C Calculations Kahn Instruments APPENDIX C APPENDIX C Optisure Optical Hygrometer User s Manual Appendix C Calc
70. o p 1 min Analogue o p imax Analogue output 2 Analogue o p 2 type Analogue ofp 2 unit Analogue o p 2 min Analogue o p 2 max H Analogue output 3 Analogue o p 3 type Analogue ofp 3 unit Analogue o p 3 min Analogue n p 3max Alarm Process alarm s p E Display Language English 1 Moisture content calculation Dry basis Period mins Sets returns the DCC period in minutes Figure 36 Optisure Series Variables Editor Screen Kahn Instruments 45 MAINTENANCE Optisure Optical Hygrometer User s Manual 5 MAINTENANCE There are no user serviceable parts on the Optisure other than cleaning the mirror in the sensor the removal and replacement of the fan filter element and the removal and replacement of the AC power supply fuse 5 1 Safety This equipment operates from power supply voltages that can be lethal and at pressures depending upon application that could cause injury Insure that any test installation meets the standards described in Section 2 3 of this manual Under NO circumstances should the instrument case be removed or the air vents covered or in any way restricted ka Maintenance and repair other than that described in this DANGER section must only be carried out by trained personnel and recone the instrument should be returned to the manufacturer for this purpose 5 2 Fuse Replacement If the instrument fails to operate after it nas been connected to an AC power supply 85 V to 264
71. on the external power supply and switch on the instrument 1 Check that the instrument is now operational If the fuse blows immediately on switch on either contact the manufacturer or their service agent DO NOT ATTEMPT ANY FURTHER SERVICING PROCEDURES 5 3 Fan Filter Cleaning To maintain adequate cooling it is essential that the fan filter be checked at periodic intervals and kept clean The frequency of checking will depend upon the working environment but checking and cleaning at three monthly intervals is recommended The fan is located on the rear panel of both vertical and horizontal models Figure 38 shows the method of removing the fan filter Figure 38 Remove and Replace Fan Filter 1 Switch off the instrument 2 Grip the fan filter casing 3 and pull it away from the fan body The casing is a push fit If will not come away easily there is a small slot located under the fan casing for the insertion of a screwdriver to assist in levering it off 3 The fan casing 3 comes away with the gauze 2 and the filter element 1 4 Clean the gauze 2 with a moist lint free cloth Kahn Instruments 47 MAINTENANCE Optisure Optical Hygrometer User s Manual 5 Wash the filter element 1 in water containing a mild detergent rinse and allow to dry 6 Clean the fan housing 7 Fit the gauze 2 and the filter element 1 into the filter casing 3 and push t
72. p must be eguipped when the instrument is operating at pressures higher than 14 5 psig 1 barg The purpose of the safety strap is to secure both over center locking bars in position to prevent them from being unexpectedly disengaged from the sensor housing If the strap is not installed the sensor housing could spring open causing damage to the instrument On both high pressure models the safety strap is installed as follows refer to Figures 16 and 17 1 Insure that the sensor chamber is at atmospheric pressure before pulling out the blanking plug 1 from the sensor housing 2 Insure that both over center clamps 2 are vertical locked and locate the two eyes 3 in the safety strap one over each locking bar and push the plug 4 fully into the microscope fixing hole 3 Lock the safety bar into position by rotating the locking screw 5 clockwise Safety strap removal 1 Insure that the sensor chamber is at atmospheric pressure 2 Rotate the locking screw 5 counter clockwise and lift off the safety strap va WV Figure 16 Removing the Blanking Plug Figure 17 Fitting or Removing the Safety Strap 20 Issue 9 2 January 2014 Optisure Optical Hygrometer User s Manual OPERATION 3 3 1 OPERATION As supplied the Optisure is ready for operation and has been set up with a set of default parameters This section describes both the general operation of the instrument and the method of settin
73. pressing Optisure Optical Hygrometer User s Manual Dewpoint P DCC ON OFF im Ad 01 Status MEASURE The MAIN Menu will pop up and Duration 00 14 22 overwrite the central area of the pn Process ON current display as shown in Figure Fault OFF 21 Within this pop up menu five Sensor CONTROL options are available EXIT DCC ON OFF MAXCOOL MEASURE Figure 21 Main Menu STANDBY OPERATE and SETUP These options are selected by means of the A up and Y down keys Pressing the key provides access to the operations associated with that option Selecting the EXIT option returns the operator to the FRONT page The next three options DCC ON OFF MAXCOOL MEASURE and STANDBY OPERATE are two state context sensitive instrument control commands These are toggled from one state to another by means of the key For example if DCC is ON DCC OFF is displayed in the MAIN Menu Operation of the key will toggle DCC to OFF and the menu will display DCC ON Section 3 6 describes the operations of these functions The MAXCOOL MEASURE and STANDBY OPERATE options operate in a similar manner displaying the only option available on the MAIN Menu When the SETUP option is highlighted pressing the key provides access to a second menu level the SETUP Menu page The SETUP Menu page and the third level VARIABLES pages are presented as full page screens The options on the SETUP Menu page are scrolled by means of the A
74. ption and desorption effects on the gas passing through the sampling system e Allow pockets of wet gas to remain undisturbed in a complex sampling system which will then gradually be released into the sample flow e Increase the chance of contamination from back diffusion ambient air that is wetter than the sample can flow from the exhaust back into the system A longer exhaust sometimes called a pigtail can also help alleviate this problem o Slow the response of the sensor to changes in moisture content An excessively high flow rate can e Introduce back pressure causing slower response times and unpredictable effects on equipment such as humidity generators o Result in a reduction in depression capabilities in chilled mirror instruments by having a cooling effect on the mirror This is most apparent with gases that have a high thermal conductivity such as hydrogen and helium POSSIBLE INJURY The tubing valves and other apparatus attached to this instrument must be adeguate for the maximum pressure which will be applied otherwise physical injury to the operator or bystander is possible Before disconnecting the Optisure from the gas line itis essential to vent the system to atmospheric pressure otherwise severe injury could result Kahn Instruments 53 CALIBRATION Optisure Optical Hygrometer User s Manual 7 1 CALIBRATION Traceability The calibration of this instrument is traceable to national standards
75. ruments Optisure Application Software 9 Launch the installation from the installation summary window 10 Restart the computer to finalize the installation If the software installation has been successful Windows should recognize the Optisure USB connection and automatically load the relevant drivers This can be checked in Windows Device Manager and if successful is listed under the Ports COM amp LPT category and should look similar to that illustrated in Figure 47 To select the Device Manager click Start and select Control Panel Double click on the System icon and select the Hardware tab Select Device Manager Failing this a prompt will show to load these drivers which can be installed from the CD supplied Kahn Instruments 75 APPENDIX E Optisure Optical Hygrometer User s Manual Device Manager H Disk drives ER 3 Display adapters i DVD CD ROM drives ie Floppy disk controllers H H Floppy disk drives Da Human Interface Devices H IDE ATA ATAPI controllers H Keyboards D T Mice and other pointing devices E R Monitors Network adapters 5 M Ports COM amp LPT bee S Communications Port COMi Bee A Communications Port COM2 Bee Michell Instruments USB to UART Bridge Controller COM3 S Printer Port LPT1 z Prolific USB to Serial Comm Port COM8 NM Standard Serial over Bluetooth link COM15 M Standard Serial over Bluetooth link COM17 SE Processors H D Sound video an
76. se four terminal binding posts Items 1 to 4 Figure 11 are provided for calibration and external monitoring purposes Two pairs of lines are provided two drive and two sense lines One black low and one red high for the drive lines and one black low and one red high for the sense lines Connections to these terminal posts can be made either via 4mm plugs pushed into the ends of the terminal posts or alternatively as shown wires 5 connected round the posts and clamped down by screw action To set up the system for PRT output refer to Section 3 10 Figure 11 Internal PRT Output 2 5 6 USB Communications Port Connector The instrument features a USB port for communication with the Application Software The appropriate cable will be supplied with the instrument 1 Check the orientation of the connector and gently push it into the socket labelled USB E qm see Figure 12 gus g 2 To remove the connector pull it out of the socket by holding the connector body Do m not attempt to remove it from the i la socket by pulling on the cable Figure 12 USB Port Connection Kahn Instruments 15 INSTALLATION Optisure Optical Hygrometer User s Manual 2 5 7 Connection of Gas Supplies POSSIBLE INJURY The tubing valves and other apparatus attached to this instrument must be adeguate for the maximum pressure
77. selection field which initially will be set at NO 6 Press the W up key to select Yes and press the key NOTE If an SD card has not been installed it will not be possible to select Yes and an error message CARD NOT Equipped will be displayed 7 A file name based on time date is automatically allocated and will be written into the File name field as soon as an SD card is inserted 8 Quit the SETUP menu by using the 4 left key selecting EXIT and pressing the key Refer to Appendix B for information on how to correctly format SD cards 36 Issue 9 2 January 2014 Optisure Optical Hygrometer User s Manual OPERATION 3 9 FAST Frost Assurance Technology Theoretically it is possible for water to exist as a super cooled dew formation below 32 F 0 C and typically can be encountered at temperatures down to 40 F 40 C Since the vapor pressure of a gas in equilibrium with a condensate is higher for water than it is for ice a chilled mirror hygrometer measuring a super cooled dew point below 32 F 0 C but assumed to be at a frost point will actually show a dew point temperature which is approximately 10 lower than the actual frost point temperature When turned on the Optisure s FAST system identifies that the measured dew point is between 40 F 40 C and 32 F 0 C and automatically decreases the mirror temperature until a pre determined film thickness of condensate is detected thereby e
78. t and P right keys to scroll through the list of parameters available for display NOTE A parameter can only be displayed on screen once If it is already displayed it is not available for display in a second panel on the same screen 4 When the required parameter is displayed press the key The display will now show an updated FRONT page Front page amp status display Dewpoint 11 46 Water Content 2256 42 Duration 00 14 22 Flow Process ON 0 73 Vmin Fauit OFF CONTROL Sensor V Select view Dewpoint 1 1 46 P 0 MIN 1 Water Content Adp 0 1 2250 42 status MEASURE Duration 00 14 14 0 D 3 ak SEET A W serci pane Dewpoint 11 46 Water Content 06 42 Select new parameter Temperature a MIN 1 Temperature Adp 0 1 21 42 CG Status MEASURE Duration 00 13 53 Flow Process ON 0 73 min Iron OFF E CONTROL Sensor Accept selected Qo parameter Temperature Temperature Adp 0 1 21 42 C Status MEASURE Duration 00 13 53 Flow Process ON 0 73 min Fault ot g Sensor CONTROL New Front Page Figure 20 Set up Display 24 Issue 9 2 January 2014 Optisure Optical Hygrometer User s Manual OPERATION 3 3 2 Operational Status Display The Status Display is shown on the right hand side of the screen and details the following 1 Stability graph shows measured dew point over a user optional duration T
79. t and pressurized gases safety glasses should be worn DO NOT permit pressures greater than the safe working pressure to be applied to the instrument The specified maximum safe working pressure is 14 5 psig 1 barg for the low pressure version or 250 psig 17 barg for the high pressure version The safety strap MUST be used when operating at pressures above 14 5 psig 1 barg refer to Section 2 5 10 This instrument is not designed to accept gas pressures higher than the specified maximum working pressure Application of gas pressures higher than the specified maximum will result in potential damage and may render the instrument unsafe and in a condition of incorrect functionality Only personnel trained in the safe handling of high pressure gases should be allowed to operate this instrument Refer to Appendix A Technical Specifications in this manual Kahn Instruments 7 Abbreviations Optisure Optical Hygrometer User s Manual The following abbreviations are used in this manual DCC FAST MAXCOOL AC atm barg bara ppmV PRT psig psia RH RTU scfh SD temp USB V Warnings Dynamic Contamination Correction Frost Assurance System Technology Maximum Sensor Cooling alternating current pressure unit atmosphere pressure unit 2100 kP or 0 987 atm gauge pressure unit absolute degrees Celsius degrees Fahrenheit common dew point European Union grams per kilogram grams per cubic meter Human M
80. tatus graph display is not functional 6 Press the 4 left key to return to the SETUP menu Press the Y down key to highlight EXIT then press the key to quit the SETUP menu 7 To return the instrument to internal monitoring repeat operations 1 to 6 above selecting INT at Step 4 38 Issue 9 2 January 2014 Optisure Optical Hygrometer User s Manual APPLICATION SOFTWARE d APPLICATION SOFTWARE The Optisure Optical Hygrometer features a USB interface for communication with the application software A copy of the application software is supplied on a CD with the instrument 4 1 Installation To install the application software on a PC place the CD in the CD drive and run either the 32 bit or 64 bit setup file on the CD depending on your type of PC i e run the 32 bit setup file if your PC is 32 bit or run the 64 bit setup if your PC is 64 bit If you are uncertain of your PC type then right click Computer in the Windows Start Menu Click Properties in the pop up menu Your system type will now be displayed along with other information After you run either setup file follow the application setup wizard displayed onscreen If an authorization code is required during the installation process please use 7316 KAHN OPTI Once the setup wizard has finished restart your PC to complete the installation 4 2 Establishing Communications When launching the application software the Communications Setup screen will be displ
81. terminal block equipped into the analog output socket 2 Strip back the wire for the common black connection to the CH1 output exposing approximately 6mm 0 25 Insert the wire into the COM1 terminal way and screw into the block Do not overtighten the screw 3 Strip back the wire for the signal e g red connection to the OP1 output exposing approximately 6mm 0 25 Insert the wire into the OP1 terminal way and screw into the block Do not overtighten the screw 4 Repeat operations 1 and 2 for the other analog outputs selecting a different color for the OP2 and OP3 outputs 5 Locate the terminal block over the connector labelled ANALOG OUTPUTS and push the terminal block firmly into the connector 2 5 3 Alarm Output Connections Two alarm outputs are provided from a terminal block Ttem 9 Figure 6 located on the rear panel of the instrument as two pairs of potential free change over relay contacts These are designated as a PROCESS alarm and a FAULT alarm Under the SETUP menu refer to Section 3 6 4 the PROCESS alarm can be configured to represent any one of the measured or calculated parameters and set up to operate when a pre set parameter threshold level is exceeded By default the PROCESS alarm is set to monitor the dew point parameter The FAULT alarm is a non configurable alarm which continuously monitors the degree of contamination of the chilled mirror During normal operational conditions this alarm will
82. tion Control DCC is a system designed to compensate for the loss of measurement accuracy which results from mirror surface contamination During the DCC process the mirror is heated to a default temperature of 20 C above the dew point to remove the condensation which has formed during measurement The surface finish of this mirror with the contamination which remains is used by the optics as a reference point for further measurements This removes the effect of contamination on accuracy After switch on the mirror is assumed to be clean therefore the instrument will only run a DCC for 2 minutes to quickly establish a clean mirror reference point By default every subsequent DCC is 4 minutes in duration and will automatically occur every 4 hours At certain times it may be desirable to disable the DCC function in order to prevent it from interrupting a measurement cycle e g during a calibration run Refer to Table 3 for a description of the parameters that can be changed relating to the DCC cycle 30 Issue 9 2 January 2014 Optisure Optical Hygrometer User s Manual OPERATION DCC OFF SEQUENCE DCC ON SEQUENCE Adp 0 1 Temperature c Status MEASURE 18 49 MEASURE Duration 03 03 25 Duration 02 03 25 Um Process ON Process ON 0 32 Fault OFF Fault OFF Sensor CONTROL Sensor CONTROL Select Main Menu Select Option DCC OFF 1 1 d li 0 0 0 MIN 1 0 MIN 1 DCC OFF DCC ON Temperatur Temperature S MAXC
83. trument via the GAS OUT port The sample gas flow rate is not controlled within the instrument If necessary this must be controlled outside the instrument typically by means of a needle valve located at the input Within the sample chamber the gas is passed over a Peltier chilled gold plated mirror The instrument s internal control system maintains the drive to the Peltier heat pump to insure by controlling the mirror temperature that a level of condensate is maintained on the mirror surface The temperature of the mirror is then measured as the dew point After passing over the mirror the sample gas is then typically exhausted to atmosphere via the GAS OUT port Using this configuration dew point measurements are taken at atmospheric pressure The sampling chamber is available in two different configurations low pressure and high pressure The low pressure version is designed to operate up to 14 5 psig 1 barg max and the high pressure version up to 250 psig 17 barg max When operating in high pressure applications a relevant gas sample line representative of the product would be taken and fed into the instrument The output port would in these applications be connected to a suitable high pressure exhaust line The gas flow would also need to be regulated externally on the output port of the instrument to maintain it within the instrument s operational limits The Optisure is suitable for the measurement of moisture content in a wi
84. ulations C 1 Water Content The accuracy of the humidity calculations was determined by comparing the displayed value to corresponding values calculated from the formulae below using a PRT simulator to set a dew point value and the Kahn Humidity Calculator to calculate the water vapor pressure wvp ppm dry wvp 101325 wvp 10 ppm wet wvp 101325 10 ppm SF wet amp dry ppm 0 12334954 g kg ppm 0 0006212138 g m 217 273 15 Dp wvp 100 Note ppm can be calculated on a dry or wet basis depending upon bit 10 in the units command register which can be set via the Application software C 2 Temperature Dew Point PRT simulators are used to simulate the dew point and ambient temperature sensors For each pair of temperature readings the instrument display is read and the actual t dp readings recorded Each of these readings is then compared against calculated t dp readings using the same input parameters to the Kahn Humidity Calculator C 3 C to F Calculation PRT simulators are used to input simulated temperatures measured in C into both measurement channels For each measurement channel the corresponding display is set to read the input temperature in F For each channel the temperature reading on the instrument display corresponding to the series of simulated PRT inputs is read and recorded Each of these readings is then compared against a corresponding temperature calculated
85. up and V down keys Pressing the key when an option is highlighted provides access to the associated third level VARIABLES page Within the third level VARIABLES pages the A up and Y down keys are used to scroll through the individual fields Pressing the key enables editing The A up and V down keys are used to change the parameter values Operation of the key sets the selected value into the appropriate field In the VARIABLES pages pressing the left key returns to the SETUP Menu In the SETUP Menu selecting the EXIT option followed by operation of the key returns to the FRONT page Once the setup parameters have been fixed only MAIN Menu operations tend to be used on a daily basis Details of the setup parameters and their default values can be found in Section 3 6 4 26 Issue 9 2 January 2014 Optisure Optical Hygrometer User s Manual OPERATION a emm emm m emm Le FRONT PAGE HIGHLIGHTED A PANE TO CHANGE FRONT PAGE AND STATUS INFO gt E gt Select new Parameter MAIN MENU POP UP Toggle EXIT between KI lt MAXCOOL MEASURE STANDBY OPERATE SETUP A Scroll Menu Items Vv DCC Holcici le OUTPUT 1 OUTPUT 2 OUTPUT 3 DISPLAY A Q Select Scroll Variables Kc Menu Items Menu VARIABLES MENU PAGES Pa PERIOD C seron RESETOPTICS INTERVAL DISPLAY HOLD Pa INTERVA
86. ut parameters selected Spans for each signal output are separately configurable Refer to Section 2 5 2 Remote temperature probe optional 6 Pin Lemo socket for connection of remote Pt100 temperature probe Alarms Process and Fault alarm outputs Each alarm has one set of potential free changeover relay contacts common COM normally closed N C and normally open N O The Process alarm can be configured to operate at a specified level on any of the measured or calculated parameters Refer to Section 2 5 3 USB communications port Used for connection to an external computer system for running application software optional IEC Power supply input socket and power ON OFF switch Universal 11 13 power input 85 to 264 V AC 47 63 Hz Fuse 2 5 A Anti Surge Glass 20mm x bmm 12 Features integrated power ON OFF switch 13 4 wire PRT bridge output Banana sockets for external 4 wire measurement of the internal PRT Active only when PRT set to External from Display options and instrument is in the MEASURE phase In this mode the dew point display is set to read zero DCC is set to OFF and manual DCC is also disabled Table 2 Rear Panel Controls and Indicators Kahn Instruments 9 INSTALLATION Optisure Optical Hygrometer User s Manual 2 5 2 5 1 Rear Panel Connections All Versions These tasks should be undertaken only by competent personnel All the connections to the rear panel are
87. ximately 6mm 0 25 wire and clamp into the screw block N O terminal way Do not overtighten the screw 3 Strip back the wire for the N C e g blue connection to the N C connector way for the FAULT alarm contact set exposing approximately 6mm 0 25 wire and clamp into the screw block N C terminal way Do not overtighten the screw 4 Repeat operations 1 to 3 for the PROCESS alarm contact set using appropriate colored wires 5 Locate the terminal block over the connector labelled ALARMS and push the terminal block firmly into the connector Kahn Instruments 13 INSTALLATION Optisure Optical Hygrometer User s Manual 2 5 4 Remote PRT Probe Optional 1 Rotate the body of the PRT probe connector until it locates in the socket labeled REMOTE TEMPERATURE see Figure 10 2 Push the connector into the socket until it locks Do not attempt to force it into the socket If it will not fit in rotate it until the key locks and it pushes in easily 3 To remove the connector slide the connector s body collar 1 back along its axis away from the instrument to release the lock and then gently pull the connector body out of the socket Do not attempt to pull it out with the cable make sure that the collar is first released Figure 10 Remote PRT Connection 14 Issue 9 2 January 2014 Optisure Optical Hygrometer User s Manual INSTALLATION 2 5 5 4 Wire PRT Output The

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