Operation and Maintenance Manual
Contents
1. WARNING Previous Calibration will be erased EDIT Gain Unity EDIT to confirm NEXT to exit PGA SETUP Gain 25 0 Counts 1011 Reading 100 Up Dn to Change Next to exit SELECT INPUT SELECT EUNITS Cat Bead 3 Wire EDIT We LEL Custom UP DOWN to change EDIT to select NEXT to exit Figure 8 2 TECHNICAL PAGE MENU SET BALANCE is for use with bridge type sensors and is not available on the GASMAX EC SET VOLTAGE is for use with bridge type sensors and is not available on the GASMAX EC SET GAIN TO UNITY clears any previous calibration OFFSET and GAIN values to 0 0 and 1 0 respectively This item is useful if a previous calibration was done in error or if screen readings appear incorrect for no apparent reason Page 34 GASMAX EC Operation amp Maintenance Manual Revision 3 5 WARNING A FULL CALIBRATION SHOULD ALWAYS BE PERFORMED AFTER A SET GAIN TO UNITY COMMAND ww WARNING Previous Calibration will be erased EDIT Gain Unity EDIT to confirm NEXT to exit Figure 8 3 SET GAIN TO UNITY MENU PREAMP GAIN SET allows adjustment of the analog amplifiers that match the sensor output to the optimum input range for the GASMAX EC signal conditioning circuits Local Smart Sensors include factory preset preamp gain values and for standard sens2. CALIBRATION DATES Record 22 of 22 CAL Date 04 05 04 UP DOWN to scroll NEXT to EXIT SMART SENSOR Type Cat Bead Span 100 Zero 0 SN XXXXXX Born On 01 28 04 Last Cal 04 05 04 ANY key to Exit Figure 7 5 SENSOR SETTINGS MENU INSTALL NEW SENSOR should always be performed when a new simple sensor is installed This deletes historical CAL data and sets sensor life to 10096 after initial calibration of the new simple sensor The GASMAX EC Smart Sensor interface will automatically detect new Smart Sensors and this menu is therefore not available with a Smart Sensor connected RECALL CAL HISTORY recalls each successful calibration These dates may be reviewed by scrolling with the UP DOWN keys INPUT TYPE indicates what kind of input or sensor the GASMAX EC is configured to accept and is typically pre configured at the factory When installed Smart Sensors upload sensor type and other data to the GASMAX EC and this data may be viewed on the SMART SENSOR information screen NEW SENSOR displays the date when a new sensor was last installed RECENT CAL displays the most recent calibration date Page 30 GASMAX EC Operation amp Maintenance Manual Revision 3 5 CLOCK DELAY SETUP Page The GASMAX EC is equipped with a crystal controlled battery backed real time clock that maintains local Time and Date These values are factory preset to US Central Time and should be
3. GD gt a a ees Gas and Flame Detection Operation and Maintenance Manual GASMAX EC Loop Powered Toxic Gas Monitor GDS Corp 1245 Butler Road e League City TX 77573 409 927 2980 409 927 4180 Fax e ww gdscorp com GASMAX EC Operation amp Maintenance Manual Revision 3 5 CAUTION FOR SAFETY REASONS THIS EQUIPMENT MUST BE OPERATED AND SERVICED BY QUALIFIED PERSONNEL ONLY READ AND UNDERSTAND INSTRUCTION MANUAL COMPLETELY BEFORE OPERATING OR SERVICING ATTENTION POUR DES RAISONS DE SECURITE CET EQUIPEMENT DOIT ETRE UTILISE ENTRETENU ET REPARE UNIQUEMENT PAR UN PERSONNEL QUALIFIE ETUDIER LE MANUE D INSTRUCTIONS EN ENTIER AVANT D UTILISER D ENTRETENIR OU DE R PARER L QUIPEMENT REVISION HISTORY Revision 3 5 1 4 15 13 Initial rewrite for GASMAX EC Copyright 2013 GDS Corp All Rights Reserved P N 1200 0852 01 Page 2 GASMAX EC Operation amp Maintenance Manual Revision 3 5 1 SAFETY INFORMATION 8 2 GENERAL INFORMATION 9 Introduction 9 GASMAX Sensors 9 3 SPECIFICATIONS 10 4 INSTALLATION 11 Locating the GASMAX EC 11 Mounting the GASMAX Instrument Enclosure 11 Mounting the GASMAX Remote Sensor Enclosure 12 Explosion Proof Installation 12 Intrinsically Safe Installation 13 Connecting Loop Power Signal Wiring 13 Local Smart Sensor 14 Connecting a Remote Sensor 15 Initial Setup 16 5 CALIBRATION 18 Calibration Overview 18 Calibration Procedure 19 6 OPERATION AND MAINTENANCE 21
4. 88 13 84 02 13 AJOUT EHD OF LOG p CLOCK DELRV SETUP P Tine Date Warm Ur Sec Cal Purge Sec 188 CALIBRATION DATES Record 22 of 22 CAL Date 04705704 UP DOWN to scroll HEXT to EXIT CONTRAST UP DOWH to change NEXT to EXIT SMART SENSOR Tyre Cat Bead Sran 168 Zero B SH XXEXXX Born n 10705704 Last Cal 10722704 ANY key to Exit SMART SENSOR info menu only available with Smart sensor installed Enter Key Sequence to access menu 44 NEXT key to Exit See Manual HELP PRESS UP KEY 4 TIMES ae WARNING Alarm Processing will be halted during diagnostic mode EDIT to continue Ans other to exit DIAGNOSTICS EDIT We Dutrut Stimulation Relay Test OUTPUT STIMULATOR 4 Outeut 4 8 mA EDIT to change Next to exit m SYSTEM SECURITY J contact Name Secure Level LOW Pass Code Unlocked WARNING Variables in the Technicians Only menu are critical for correct operation A thorough understanding of each variable is required READ amp UNDERSTAND THE MANUAL Technicians Only menus discussed in Section 6 Figure 7 1 MAIN MENU FLOWCHART Page 26 r ACTUATE RELAYS Relay 1 OFF gt Reis 2 OFF Relay 3 OFF GASMAX EC Operation amp Maintenance Manual Revision 3 5
5. ter tates 31 FIGURE 7 7 CONTRAST MEND u FR ERR ENDE 31 FIGURE 7 8 DIAGNOSTICS MENU 5 ttt Ren UR a erp e thats ts 6 32 FIGURE 7 9 SYSTEM SECURITY MENU sg saa s m RD RE En 32 FIGURE8 1 XMITTER CONFIG MENU ec cect ccs oreet ehe rte re eet testo heri eter etre Sua naa 33 FIGURE 8 2 TECHNICAL PAGE MENU 34 FIGURE 3 55 3 TO UNITY MENU rt entm s re rene ree Gai Se 35 FIGURE 8 4 PREAMP GAINSET MENU rentrer th rra RR RE ert RU eadera ees 35 FIGURE 10 1 GASMAX EC LOCAL SENSOR SPARE PARTS esee eene nennen enne 39 FIGURE 10 2 GASMAX SENSOR HEAD SPLASH GUARD amp FLOW CELL 39 FIGURE 10 3 GASMAX EC REMOTE DIRECT SENSOR HEAD 4 nene nennen ens 40 Page 7 GASMAX EC Operation amp Maintenance Manual Revision 3 5 Important Read Before Installation Users should have a detailed understanding of GASMAX EC operating and maintenance instructions Use the GASMAX EC only as specified in this manual or detection of gases and the resulting protection provided may be impaired Read the following WARNINGS prior to use WARNINGS e The GASMAX EC gas monitor described in this manual must be installed operated and maintained in accordance with information contained herein Installation in any hazardous area mus
6. Recall Cal History 3 Input Tyre Cat Bead Hew Sensor 6128 64 Recent Cal 64 05 64 Sensor Life INSTALL SENSOR menu not available with Smart sensor installed SYSTEM CONFIG PG 1 SYSTEM CONFIG PG 2 Al CURUE POINTS Measurement Name 16 yp M Readout Deadband 8 press Key Seauence Eunits AXKKKRRRAA 10 DOWN Lack Pea ive Bo N EDIT ers meny 4 TIMES Ld ER T 9 Zero 07 Eunits inearization Data Dat Y Sean coer Eun Backue Config 3 NEXT key to Exit 2 Input 18 88 Decimal Points puede dun A See Manual Z HELP Output 18 58 al Marker 2 an Dal Span MAL 58 y TA Sensor Life NO Simple Sensor Installed Smad Sansar installed ALARM SETTINGS ALARM x SETUP alarm 1 2 3 menus Alarm 1 N BR Set Point 28 are identical Alarm 2 Dead Band m Alarm 3 Fail gt ON Delay s Relay Config OFF Delas Br gt pent Eos Catching 6 EVENT LOG Edt 68712784 BL IN redii Event Los 09 12 04 Aa M 8 ur oy ae d 08712704 A20UT r 5455 MODBUS SETUP RELAY CONFIG Ge 0 3 RTU Address wi Failsafe NO 08712704 AOUT aud Rate 2 Failsafe 08713704 IN Parity Hone K2 Acknowledge HD Stor Bit 1 K2 Refresh OFF Down m INSTALL SENSOR EDIT to install New Sensor Any other key to Exit INSTALL SENSOR EDIT Will be Deleted EDIT to Accert HEXT to Abort Historical CAL data
7. GASMAX Display Screens 21 Data Display Screen 21 Trend Display Screen 22 Normal Operation 22 Page 3 GASMAX EC Operation amp Maintenance Manual Revision 3 5 Alarm Operation ALARM 1 and 2 Alarm Operation ALARM 3 Sensor Replacement Sensor Replacement Remote Sensors Normal Maintenance 7 USER MENUS Main Menu System Configuration Page Measurement Name Eunits Zero 096 Span 10096 Decimal Points Cal Span Value Readout Deadband Track Negative Temp Compensation Backup Config Restore Config Upload Sensor Data Cal Marker TX Sensor Life Alarm Settings Page Set Point Dead Band ON Delay OFF Delay Low Trip Latching Display Event Log Clear Event Log Page 4 22 23 23 25 25 26 26 27 27 27 27 27 27 27 27 27 28 28 28 28 28 28 29 29 29 29 29 29 29 30 30 GASMAX EC Operation amp Maintenance Manual Revision 3 5 Sensor settings page Install New Sensor Recall Cal History Input Type New Sensor Recent Cal CLOCK DELAY SETUP Page Time Date Warm Up Delay Cal Purge Delay LCD CONTRAST Adjustment Page HELP Screen Page DIAGNOSTICS Page Output Simulation Relay Test SYSTEM SECURITY Page Contact Name Secure Level 8 TECHNICIANS MENUS XMITTER CONFIG Menu O2 Toxi
8. 5 pounds 3 kg Approvals CSA Certified Division 1 amp 2 Groups B C D Suitable for explosion proof installations with flame arrestor CSA Certified Division 1 amp 2 Groups A B C D Intrinsically safe when used with IS barrier 10 0263 MTL 7787P or equivalent ATEX Certified EX Il 2 G EEx d IIB H2 T5 Warranty Two years on electronics one year on sensor 10 Oxygen 22 Ethylene Oxide 11 Carbon Monoxide 23 Arsine 12 Chlorine 24 Silane 13 Chlorine Dioxide 25 Fluorine 14 Hydrogen 26 Phosgene 15 Hydrogen Sulfide 27 Hydrazine 16 Hydrogen Cyanide 28 Nitric Oxide 17 Hydrogen Chloride 29 Nitrogen Dioxide 18 Hydrogen Fluoride 30 Mercaptan 19 Sulfur Dioxide 31 Tetrahydrothiophene 20 Ammonia 32 Diborane 21 Ozone 33 Hydrogen Sulfide Low RH Figure 3 1 GASMAX EC Toxic Sensors Page 10 GASMAX EC Operation amp Maintenance Manual Revision 3 5 Locating the GASMAX EC Factors such as air movement gas density in relation to air emission sources and environmental variables affect correct sensor location Air movement by fans prevailing winds and convection should be carefully evaluated to determine if a leak is more likely to raise gas levels in certain areas within the facility Vapor density of a gas determines if it will rise or fall in air when there are no significant currents Lighter than air gases should have the monitors mounted 12 18 inches 30 45 cm above the potential
9. Figure 10 2 GASMAX Sensor Head Splash Guard amp Flow Cell Page 39 GASMAX EC Operation amp Maintenance Manual Revision 3 5 Remote Sensor Remote Sensor Head Assembly 20 0126 Remote Toxic or Bridge Direct Type 5 6 20 0127 Remote Toxic Reactive Gas Type 7 8 Note Does not include sensor Figure 10 3 GASMAX EC Remote Direct Sensor Head Page 40 GASMAX EC Operation amp Maintenance Manual Revision 3 5 4 Page 41
10. STEP IT CAN BE DAMAGED USE CAUTION WHEN REINSTALLING THE SENSOR HEAD COVER Page 23 GASMAX EC Operation amp Maintenance Manual Revision 3 5 een 11 i 2 REMOVE OLD SENSOR 3 INSTALL NEW SENSOR PULL STRAIGHT DOWN ALIGN ARROWS PUSH STRAIGHT UP 1 UNSCREW SENSOR DO NOT ROTATE 4 CAREFULLY REATTACH HEAD COVER SENSOR HEAD COVER Figure 6 4 Sensor Replacement Local Smart Sensors are automatically recognized by the GASMAX EC and the Smart Sensor identification screen shown in Figure 6 1 left side should appear immediately after the installation of a local Smart Sensor If the sensor is the same gas type as was previously installed the sensor s calibration data will be uploaded into the GASMAX EC All other parameters stored in the GASMAX EC will be retained GASMAX EC units can be reconfigured for different sensors by simply installing a different type compatible sensor If a new sensor TYPE is installed the Smart Sensor identification screen will appear followed by the ERROR CODE 01 message and the user will be given the opportunity to confirm the new sensor type If the user activates the EDIT key all data stored in the new sensor s database including range tag name cal span value engineering units and alarm levels will replace the current settings SMART SENSOR ERROR CODE 01 Type Cat Bead Incorrect Sensor 2 E cor i ES e bane i En If installed sensor SN XXXXX
11. System Configuration Page The System Config group consists of two pages of menus as shown in Figure 6 2 Each item s description follows in this section SYSTEM CONFIG PG 1 SYSTEM CONFIG PG 2 A easurement Name 16 UP eadout Deadband 0 Eunits XXXXXXXXXX 10 DOWN Track Negative NO Zero 0 Eunits Temp Compensation gt Span 100 Eunits Backup Gon tld gt Restore available only ake e Rest ore o Upload without smart sensor installed Cal Span Val 50 Cal Marker 3 0 0 t Sensor Cire Me Upload available only Simple Sensor Installed Smart Sensor Installed with smart sensor installed Figure 7 2 SYSTEM CONFIG MENU MEASUREMENT NAME may be edited to contain virtually any 16 character field and is typically used to describe the monitored point by user tag number or other familiar terminology To modify the existing setting press the EDIT key when the cursor is pointing to the entry Use the UP or DN keys to change the character and the NEXT key to move to the next character Press EDIT again when done EUNITS engineering units may have up to a 10 character ASCII field Many common gases have pre configured Eunits based upon the sensor type and each may be edited in this menu as described in Configuration Using the Magnetic Wand section 5 2 ZERO 0 defines the reading to be displayed when 4mA 0 is the GASMAX EC output SPAN 100 define
12. gas leak and heavier than air gases should be this distance below Even though the GASMAX EC is designed for rugged service sensors should be protected from environmental damage from water snow shock vibration and dirt Mounting the GASMAX Instrument Enclosure The GASMAX EC standard enclosure is a cast aluminum explosion proof NEMA 7 enclosure as shown in Figure 4 1 ppm Hes MEASUREMENT WARE Figure 4 1 GASMAX EC Explosion Proof Enclosure The GASMAX EC should always be mounted with the sensor head opening facing down If necessary a Splash Guard p n 10 0205 should be attached if there is any chance that water or liquid spray could enter the sensor opening from below Be sure to leave sufficient room 12 below the sensor head to allow easy access for attachment of a Calibration Cup and or removal of the sensor head cover for sensor replacement Page 11 GASMAX EC Operation amp Maintenance Manual Revision 3 5 Mounting the GASMAX Remote Sensor Enclosure The GASMAX EC remote sensor consists of a cast aluminum explosion proof junction box and stainless steel sensor head see Fig 4 2 The junction box contains a PCB with connection point for the sensor head cable and wiring terminals for the three wire connection to the GASMAX EC display enclosure Fittings are NPT The sensor head should ALWAYS be mounted vertically as shown and GDS Corp recommends side entry for all conduit
13. quadrant around the LCD display Starting in the upper right and proceeding clockwise these are labeled NEXT EDIT DOWN CAL and UP To activate or press a magnetic switch swipe the magnet near the switch ppm Hes MEASUREMENT NAME Figure 6 1 GASMAX EC Display Screens Pressing the NEXT key causes the GASMAX display to switch display screens between DATA and TREND displays The EDIT key activates the USER MENU display mode When in user menu display mode use UP and DOWN to select an item EDIT to change an item and NEXT to exit the menu or function and return the GASMAX EC to display mode Activating DOWN CAL followed by EDIT while in display mode initiates calibration mode For the balance of this manual the term press will be used to describe activation of any key via the magnetic wand Data Display Screen The DATA display screen shows a single channel s information The current value is shown in calibrated engineering units A horizontal bargraph tracks the current value and shows the Alarm 1 and Alarm 2 values in graphical form The user programmable Engineering Units Eunits and Measurement Name text strings are shown below the real time reading Above the LCD display three LEDs indicate the status of the level and fault alarms Page 21 GASMAX EC Operation amp Maintenance Manual Revision 3 5 ppe Hes REASUREMENT WARE Figure 6 2 GASMAX Data Display Screen Trend Displa
14. reading of 20 8 CAL MODE automatically exits if no keystrokes are detected after 5 minutes Follow these GASMAX EC calibration guidelines e Calibration accuracy is only as good as the calibration gas accuracy GDS Corp calibration gases are traceable to NIST National Institute of Standards and Technology e Never use calibration gas that has passed its expiration date e Check the SPAN GAS VALUE setting and make sure it matches the calibration gas See Fig 6 2 e Always use a GDS Corp calibration cup that completely surrounds the sensor head e Be sure to use ZERO AIR a mixture of 21 oxygen and 7996 nitrogen as a zero reference unless you are certain that no target gas exists in the area Ambient gas may result in an elevated zero condition that will cause a FAULT to occur once the ambient gas is no longer present e Always calibrate a new sensor before depending on the device for personnel or equipment safety e Calibrate on a regular schedule GDS Corp recommends a full calibration every 3 months with periodic bump tests on a more frequent basis to ensure that the sensor has not been affected by temperature extremes or the presence of incompatible gases Page 18 GASMAX EC Operation amp Maintenance Manual Revision 3 5 Calibration Procedure Before beginning calibration make sure you have the following items A cylinder of calibration gas fixed flow regulator and an appropriate calibration cup connect
15. reset to correctly match the current time zone during installation to make sure that time stamped Event Log entries are correct CLOCK DELAY SETUP Time 12 35 42 Date 04 22 04 Warm Up Sec 120 Cal Purge Sec 100 Figure 7 6 CLOCK DELAY MENU TIME adjusts time of day in hours minutes and seconds DATE adjusts date in month day year WARM UP DELAY sets the amount of time from power on until the 4 20mA output signal begins to track the sensor output Default setting is 60 seconds Maximum value is 255 seconds CAL PURGE DELAY sets the amount of time from the completion of span calibration until the 4 20mA output signal restarts tracking the sensor output The default setting is 60 seconds and the maximum value is 255 seconds LCD CONTRAST Adjustment Page The LCD Contrast Adjustment allows the display to be set for optimum viewing CONTRAST UP DOWN to change NEXT to EXIT Figure 7 7 CONTRAST MENU HELP Screen Page The Help screen contains several pages of information describing GASMAX EC operation DIAGNOSTICS Page The Diagnostics page provides tools for use during setup or testing Since relays are not available on the GASMAX EC the Relay Test option is not functional Page 31 GASMAX EC Operation amp Maintenance Manual Revision 3 5 WARNING DIAGNOSTICS OUTPUT STIMULATOR 4 Alarm processing willl EDT Output Stimulati
16. runs Figure 4 2 GASMAX EC Remote Sensor Explosion Proof Installation GASMAX EC monitors with standard explosion proof sensor heads are certified for use in Class 1 Division 1 hazardous areas Installation in these areas should follow best industry standard practices and all appropriate electrical codes Generally these codes require rigid metal conduit poured seals and other installation elements necessary to ensure safety In all cases GDS Corp recommends the GASMAX EC be mounted vertically with the sensor opening facing down If there is a possibility that water or other liquid may be present GDS Corp further recommends the installation of a Splash Guard p n 10 0205 to protect the sensor from damage For maximum protection against interference or electrical surge the GASMAX EC enclosure and conduit must be properly grounded Page 12 GASMAX EC Operation amp Maintenance Manual Revision 3 5 Intrinsically Safe Installation GASMAX EC monitors with standard explosion proof sensor heads or with sensor heads designed for reactive gases may be installed as Intrinsically Safe Wiring for IS devices is simpler to install and generally does not require conduit however in any case adequate protection against chafing crushing or other hazards should be considered and an appropriate IS barrier must be installed where the wiring enters a safe area see Installation Drawing GDS 11 0100 EC Fig 4 6 For maximum
17. 5mA equal to 100 sensor life see Figure 5 5 The output then returns to 4mA for the remainder of the CAL PURGE delay For example if after a calibration sensor life is 7596 the GASMAX EC transmits 4 75mA during the 5 second interval Note TX Sensor Life should always be set for NO unless the 4 20mA receiver is capable of interpreting the sensor life signal Most GDS Corp Protector Series controllers include this capability 4mA for 10 seconds after Cal Exit Then 4 5mA for 5 seconds Sensor Life Value 4mA 0 life 5mA 100 life 5 4mA Monitoring Monitoring Cal Marker Adjustable Calibrating Cal Delay Figure 7 3 SENSOR LIFE TRANSMISSSION FORMAT Page 28 GASMAX EC Operation amp Maintenance Manual Revision 3 5 Alarm Settings Page The Alarm Settings page covers the Alarm 1 2 3 Setup and Event Log menu items Alarm 1 Alarm 2 and Alarm 3 Fail menus are identical and are therefore described only once in this section For the GASMAX EC the alarm settings only affect the operation of the front panel LEDs Separate alarm settings may need to be programmed in the 4 20mA receiving device Alarm 1 2 3 menus are identical ALARM SETTINGS ALARM x SETUP RELAY CONFIG 1 gt Weset Point 20 Wek Failsafe NO Alarm 2 gt Dead Band 1 K2 Failsafe NO Alarm 3 Fail gt ON Delay Os K2 Acknowledge NO Relays Config gt OFF Delay 0m K2 Refresh Of f Alarm Event Log gt L
18. AN TRIM provides a way to precisely set the GASMAX EC 4mA and 20mA outputs to compensate for variation in output components These settings are programmed at the factory and should not be modified REAL TIME CLOCK adjusts the date and time for use in EVENT LOGGING The current time and date can also be adjusted from the Main Menu See Section 7 MODEL is factory set and should not be modified BACKLIGHT is not available in the GASMAX EC Page 33 GASMAX EC Operation amp Maintenance Manual Revision 3 5 TECHNICAL PAGE Menu The TECHNICAL PAGE menu is used to adjust certain parameters associated with local or remote sensors To access the TECHNICAL PAGE menu active the Main Menu move the cursor to the second page and select Technicians Only Enter the special key sequence to enter the TECHNICAL PAGE menu WARNING TARGET GAS MONITORING AND ALARM PROCESSING ARE NOT ACTIVE WHILE IN THIS MENU TECHNICAL PAGE 1 EDIT SENSOR BALANCE WeSet Balance gt i Set Sensor Voltage gt Reading 3 Set Gain to UNITY gt Counts 496 PreAmp Gain Set gt EEE Input Type gt ZERO Cal Val 0 UP DN to Change NEXT to Exit SENSOR BALANCE amp SENSOR VOLTAGE menus are only active when input type TECHNICAL PAGE 2 A SENSOR VOLTAGE Cat Bead 3 Wire Raw Min Cnts 511 _ volts 2 04 Raw Max Cnts 1000 UP DN to Change NEXT to Exit WARNING High voltage may damage sensor
19. Display Assembly See Fig 4 4 Two wire 4 20mA Loop O o Mounting Assembly Display Assembly Oo O S1 Ribbon to Display CTR REF EN 997 0 Local Toxic Sensor Cable from sensor head connects to S1 on back of display assembly Figure 4 4 Local Smart Toxic Sensor IMPORTANT TOXIC SENSORS ARE SUBJECT TO ACCELERATED DETERIORATION IF POWER IS NOT SUPPLIED WITHIN 3 MONTHS OF SHIPMENT FROM GDS CORP Page 14 GASMAX EC Operation amp Maintenance Manual Revision 3 5 Connecting a Remote Sensor GASMAX EC monitors with remote mount toxic sensors are shipped in two pieces and sensor wiring must be installed by the end user Remote toxic sensors connect to the Channel 1 Simple Sensor input on the back of the Display Assembly as shown in Figure 4 6 Due to the small signal output from toxic sensors remote direct input toxic sensors should be mounted no more than 15 wire feet from the GASMAX EC display Further the cable used should be three wire stranded with foil shield and should be run inside metallic rigid conduit GDS Corp recommends Belden B8771 The cable shield must be connected to an earth ground at ONE END ONLY Two wire 4 20mA Loop GMII Display Backside S to J box S GMII Display Backside R to J box R GMII Display Backside C to J box C Figure 4 5 GASMAX EC Remote Sensor Wiring Page 15 GASMAX EC Operation amp Maintenance Manua
20. SMAX EC REMOTE SENSOR WIRING esee nennen enne nnne ens 15 FIGURE 4 6 GASMAX INTRINSICALLY SAFE INSTALLATION eene nennen nnns 16 FIGURE 4 7 GASMAX EC IS WIRING GUIDELINES eese nennen nnne aus 16 FIGURE S 1 CALIBRATION SETUP ERREUR 19 FIGURE S27 CALIBRATION FEOWCHART 7 secet ctend codessdncvanshincvevsnts eek ente a eoa nte 20 FIGURE 6 1 GASMAX EC DISPLAY SCREENS 21 FIGURE 6 2 GASMAX DATA DISPLAY SCREEN nanaii a a aa aina altin 22 FIGURE 6 3 GASMAX TREND DISPLAY SCREEN L nennen nnne nennen nes 22 FIGURE 6 4 SENSOR REPLACEMENT cn terere meii pp eee a RE eR ER RR ERES 24 FIGURE 6 5 SMART SENSOR RECOGNITION SCREEN nennen inneren 24 FIGURE 7 1 MAIN MENU FLEOWCHART usa s na s aan nennen nennen nennen nnne nennen h pn a qY 26 FIGURE 7 2 SYSTEM CONFIGIMENU Q u ete te eere tee ehe nete sneered eeteudsneysteevateedhcecese de 27 FIGURE 7 3 SENSOR LIFE TRANSMISSSION FORMAT Q nnne nena 28 FIGURE 7 4 ALARM SETTINGS MENU ree re eere eere ert ee een terne ne NENO ee ene ees 29 FIGURE 7 5 SENSOR SETTINGS MENUJ ee ert hereto tere tte rp a re N aee ai ire ra 30 FIGURE 7 6 CLOCK DELAY MENU 5 Patet
21. X update transmitter type does not match Born On 01 28 04 SEE MANUAL transmitter database Last Cal 04 05 04 EDIT key to update ANY key to Exit Any other to abort Figure 6 5 SMART SENSOR Recognition Screen Page 24 GASMAX EC Operation amp Maintenance Manual Revision 3 5 Sensor Replacement Remote Sensors To replace a remote sensor follow these steps 1 2 Declassify the area or remove power to the GASMAX EC Unscrew the remote sensor head cover If unable to open the cover by hand use a Sensor Head Replacement Tool p n 10 0187 Remove the old sensor by pulling straight down NOTE DO NOT TRY TO UNSCREW THE SENSOR PULL STRAIGHT DOWN Carefully install the replacement sensor by aligning the arrow on the sensor with the arrow engraved on the sensor head Push straight up until the sensor connector seats firmly into the sensor connector Reinstall the sensor head cover by CAREFULLY screwing the cover onto the sensor head NOTE IF THE SENSOR FALLS OUT OF THE SENSOR HEAD DURING THIS STEP IT CAN BE DAMAGED USE CAUTION WHEN REINSTALLING THE SENSOR HEAD COVER At the GASMAX EC activate the Main Menu open the Sensor Information page and select Install New Sensor This will reset the Sensor Life settings and tell the GASMAX EC that a new sensor is available NOTE If the new sensor is of a different TYPE a number of other settings including input type range cal span value and
22. art shown in Figure 5 2 illustrates the above procedure UP CAL NEXT amp EDIT labels indicate keystrokes using the magnetic wand ZERO or SPAN calibration will fail if the readings exceed built in limits for maximum allowable zero or minimum allowable span NOTE A CAL MODE INFO SCREEN IS AVAILABLE TO VIEW CERTAIN CAL MODE PARAMETERS DURING CALIBRATION HOLD THE UP KEY FOR 5 SECONDS DURING CAL MODE TO DISPLAY THIS SCREEN live reading Eunits CAL MODE info screen use to change SPAN GAS value and to see Offset Gain constants PGA NEXT Return to Cal Hold UP key 5 sec Hold UP key 5 sec Back to DATA Page 20 Figure 5 2 CALIBRATION FLOWCHART DATA DISPLAY DISPLAY CAL then EDIT AFF ly ZVAL NEXT KEY RFF13 SVAL NEXT REMDUE H Eunitz gt gt Eunits h iie ia Pal CAL 885 Se aed HEXT SPAN CAL Mode NEATHERIT CAL Mode EDIT EDIT IF ZERO Cal Fails I ZERO Cal OK IF SPAN Cal Fails If SPAN Cal OK show for 5 seconds show for 5 seconds REPEAT CAL E REPEAT CAL SFAH CAL ZERO FAIL ERO CAL SPAN FAIL Successful ERROR CODE 4 successful ERROR CODE 5 penser eig GASMAX EC Operation amp Maintenance Manual Revision 3 5 GASMAX Display Screens The GASMAX display is shown in Figure 2 1 There are four magnetic switches on the face of the GASMAX arranged in a
23. c LEL Current Output Zero Span Trim Real Time Clock Model TECHNICAL PAGE Menu Set Balance Set Voltage Preamp Gain Set Input Type Zero Cal Value Page 5 30 30 30 30 30 30 31 31 31 31 31 31 31 31 32 32 32 32 32 33 33 33 33 33 33 33 34 34 34 35 35 36 GASMAX EC Operation amp Maintenance Manual Revision 3 5 Raw Min Max Counts Marker Menu 9 TROUBLESHOOTING GUIDE Toxic Sensor Indicates Fault or Overrange Toxic Sensor Will Not Calibrate Receiving Device and GASMAX Displayed Values Don t Match GASMAX Display Blank GASMAX Error Codes 10 SPARE PARTS Display amp Enclosure Sensor Head Accessories Remote Sensor 11 DRAWINGS AND DIMENSIONS Page 6 36 36 37 37 37 37 37 37 39 39 39 40 41 GASMAX EC Operation amp Maintenance Manual Revision 3 5 TABLE OF FIGURES FIGURE 3 1 7 1 412086 119 7122 10 0 a aa aQ 10 FIGURE 4 1 GASMAX EC EXPLOSION PROOF ENCLOSURE U nnne ens 11 FIGURE 4 2 GASMAX EC REMOTE 5 a upa i Gas se a yaaa g 12 FIGURE 4 3 GASMAX EC LOOP POWER L inneren nna 13 FIGURE 4 4 EOCAESMART TOXICSENSOR 6 rette ette e ente tenete ete 14 FIGURE 4 5 GA
24. e channel fixed point gas monitor designed to provide continuous monitoring of toxic or combustible gases in hazardous areas Gas values are displayed in calibrated engineering units as well as bar graph or 30 minute trend graph format The GASMAX EC supports one local or remote mount sensors for toxic gas The advanced microcontroller non intrusive magnetic interface and superior graphic LCD interface offers rapid setup ppm HZS simplified operation and enhanced diagnostics not found in previous REASUREREWT NARE generation products On board non volatile memory retains all configuration data during power interruptions A single loop powered 4 20 mA output allow for easy connection to control systems or other alarm instrumentation Built in user prompted calibration makes it easy for one person to perform calibration and maintenance without opening the enclosure or declassifying the area A battery powered real time clock and event log allows the GASMAX EC to track calibration and alarm events for later recall on the LCD readout GASMAX Sensors For toxic gases the GASMAX EC supports a wide range of electrochemical echem sensors These sensors use chemical reactions to sense the presence of gases such as hydrogen sulfide chlorine sulfur dioxide and many others Echem sensors output very low level signals remote echem sensors should be mounted no more than 15 feet from the GASMAX enclosure the wiring sh
25. ed to the regulator via a length of flexible tubing If necessary a cylinder of zero air may be necessary if the absence of target gas cannot be confirmed GDS Corp recommends a flow rate of 0 5 liters minute for standard gases and a flow rate of 1 0 liters minute for highly reactive gases such as chlorine or chlorine dioxide Flexible Tubing gt Fixed Flow Regulator Cylinder of Calibration Gas Calibration Cup Figure 5 1 Calibration Setup To calibrate a GASMAX EC detector 1 To enter CAL MODE press the DOWN CAL key and within 5 seconds press the EDIT key 2 The screen will display an APPLY ZERO message Using the setup shown in Fig 5 1 apply clean ZERO air unless it can be guaranteed that no target gas is present After the reading stabilizes press the EDIT key to complete the ZERO calibration Page 19 GASMAX EC Operation amp Maintenance Manual Revision 3 5 3 Ifthe ZERO CAL SUCCESSFUL message is displayed an APPLY SPAN message will appear Apply the correct SPAN gas After the reading is stable approximately 1 minute press the EDIT key to complete the SPAN GAS calibration If the SPAN calibration is successful the display flashes REMOVE CAL GAS and starts the CAL PURGE delay 4 Immediately shut off the regulator and remove the calibration cup At the end of the CAL PURGE delay the GASMAX EC output is re enabled and the unit is fully operational The flow ch
26. enance Manual Revision 3 5 4 CAL MARKER value Adjust desired output mA during calibration Sec 6 2 5 ALARM 1 ALARM 2 settings Set for desired levels NOTE GASMAX EC programmable alarm levels affect operation of front panel LEDs only Sec 6 3 Allow the GASMAX EC to stabilize for at least four hours preferably overnight if possible This will allow the sensor to reach stable equilibrium with respect to environmental conditions such as ambient temperature humidity and barometric pressure as well as applied reference and counter voltages generated by the GASMAX EC electronics At this point the GASMAX EC can be calibrated and made operational Page 17 GASMAX EC Operation amp Maintenance Manual Revision 3 5 Calibration Overview Calibration is critically important to ensure correct operation of the GASMAX EC The built in CAL MODE function is designed to make calibration quick easy and error free a successful ZERO and SPAN calibration requires only four keystrokes During CAL MODE zero and span the sensor output is disconnected and the GASMAX EC transmits a fixed mA value called the CAL MARKER to notify the receiving device that a calibration is in progress During the following CAL PURGE DELAY time the GASMAX EC transmits a fixed 4 0 mA signal to prevent external alarms during calibration In the case of local or remote Oxygen sensors during CAL PURGE DELAY the output simulates a typical atmospheric
27. ero reading Toxic sensors with high zero readings must be replaced 05 Span calibration failure Span readings must be within a range of from to 2x the target value For example if the target is 50 ppm the sensor must output at least 25 ppm and no higher than 100 ppm at the current preamp gain setting for calibration to proceed 06 History data file full Clear event log to remove 07 Sensor Channel Data CRC Fail Error in sensor data transfer Contact factory 08 System Data CRC Fail Error in system data file Contact factory 09 Custom Data CRC Fail Error in system data file Contact factory 10 Linearization Data CRC Fail Error in system data file Contact factory Page 38 GASMAX EC Operation amp Maintenance Manual Revision 3 5 Display amp Enclosure Base plate with standoffs 10 0262 All ppm Hes aT e AX NEASURENENT MANE Yellow Enclosure 10 0160 GASMAX Enclosure Sensor Head 10 0247 Toxic or Bridge Direct Type 1 2 10 0247F Toxic Direct Reactive Gas Type 3 4 Note Does not include sensor Display 10 0232 GASMAX Display Figure 10 1 GASMAX EC Local Sensor Spare Parts Sensor Head Accessories Sensor Head Splash Guard 10 0198 Splash Guard Fits all sensor heads i r m R Sensor Head Flow Cell 10 0205 Flow Cell 1 8 NPT compression fittings p 20 0205S Other specify Splash Guard Flow Cell
28. ing during span calibration too low sensor may be defective However it may be possible to temporarily continue operation by increasing PREAMP GAIN See Section 8 2 for more details Receiving Device and GASMAX Displayed Values Don t Match Check that zero and full scale range values match between GASMAX and receiving device controller Use DIAGNOSTICS menu to force GASMAX EC output to 12mA 1 2 scale and verify appropriate half scale reading on controller Check for high impedance shorts to ground on 4 20mA wiring If 4 20mA output is off scale low or high and cannot be adjusted using DIAGNOSTICS mode IO Power Supply board may be defective and should be replaced GASMAX Display Blank Verify DC loop power at back of Display Assembly GASMAX Error Codes 01 Incorrect sensor type new sensor does not match most recent type of sensor This is normal if changing sensor types If unexpected verify that new sensor type matches previous sensor type 02 Zero or span mismatch Smart sensor zero or span values differ from those stored in the GASMAX Page 37 GASMAX EC Operation amp Maintenance Manual Revision 3 5 03 Sensor Calibration Error Contact factory 04 Zero calibration failure Zero readings must be within 1096 of zero For example if the range is 0 100 ppm the zero reading cannot be above 10 ppm For bridge type sensors it may be possible to readjust the balance to restore a z
29. l Revision 3 5 Hazardous Area Class Group A B C AND D Safe Area Barrier 11919 s wo A a 10 0247 10 0247F 1 Entity parameters Vmax 30VDC Imax 100mA Ci 0 Li 0 2 Barrier may bein Division 2 location if so approved 3 Cable capacitance plus intrinsically safe equipment capacitance must be less than the marked capacitance Co shown on any barrier The same applies for inductance Capacitance and inductance of field wiring from intrinsically safe equipment to the barrier should be calculated as Ccaie 60 pF ft and Leatie 0 2 uH ft and should be included in system calcula tions 4 Selected barriers must be third party approved as intrinsically safe for the application and have V lt not exceeding Vmax and Isc no exceeding Ima of the intrinsically safe equipment as shown in Table 1 Table 1 I S Equipment Barrier Vmax gt Voc Imax gt Isc Ci Ccable lt Co Li Leable lt Lo 5 Barriers must be installed in accordance with barrier manufacturer s control drawing and article of the National Electrical Code ANSI NFPA 70 CEC Part 1 or other local installation codes as applicable 6 Control equipment must not use or generate more than 250V with respect to earth 7 intrinsically safe wiring Important Only GASMAX EC two wire models may be applied as intrinsically safe installations 8 The GASMAX EC may be fi
30. nce alarms caused by brief spikes beyond the set point OFF DELAY allows entering a maximum 120 minute delay before clearing an alarm after the alarm condition is gone This is useful for continuing an alarm function such as operation of an exhaust fan for a period of time after the alarm condition clears LOW TRIP set to YES causes the alarm to trip as the value falls below the set point LATCHING set to YES causes the alarm to remain active even after the condition is gone and only reset when the UP RESET key is pressed from a data display Page 29 GASMAX EC Operation amp Maintenance Manual Revision 3 5 DISPLAY EVENT LOG displays the stored events in the Event Log These include power on cold boot alarms and alarm acknowledge events The event log stores the date and time of the most recent 300 events CLEAR EVENT LOG clears the event log Sensor settings page The Sensor Information page covers settings associated with Smart or simple sensors Users can review information contained in the Smart Sensor database or adjust settings for remote simple sensors SENSOR SETTINGS INFO gt INSTALL NEW SENSOR INSTALL NEW SENSOR B install Sensor gt EDIT to install Historical CAL data Recall Cal History gt New Sensor EDIT wil be Deleted Input Type SMART gt New Sensor 01 28 04 Any other key EDIT to Accept Recent Cal 04 05 04 tb Exit NEXT to Abort Sensor Life
31. ne Oxide ppm Eth O2 Negative Hydrogen Chloride ppm HCL Negative Hydrazine ppm N2H4 Negative Arsine ppm Arsine Negative Sulfur Dioxide ppm SO2 Negative Hydrogen ppm H2 Negative Hydrogen Cyanide ppm HCN Negative Phosgene ppm COCI2 Negative Phosphine ppm PH3 Negative Hydrogen Fluoride ppm HF Positive Nitrogen Dioxide ppm NO2 Positive Ozone ppm Ozone Positive Chlorine ppm CI2 ZERO CAL VALUE should always be set to 0 RAW MIN MAX COUNTS is factory preset and should not be changed MARKER MENU functions are not available on the GASMAX EC Page 36 GASMAX EC Operation amp Maintenance Manual Revision 3 5 Toxic Sensor Indicates Fault or Overrange Certain toxic sensors indicate off scale low or high at power up and quickly drift towards zero This is normal behavior Toxic sensors showing constant FAULT If local remove sensor and examine for moisture or discoloration Replace sensor if wet or discolored If remote check sensor cable and junction box for moisture or standing water Remove sensor and examine for moisture or discoloration FAULT indication generally indicates sensor useful life is exhausted Toxic sensors left unpowered for more than 3 months are subject to accelerated degradation and may demonstrate a permanent loss of sensitivity Toxic Sensor Will Not Calibrate Sensor reading during zero calibration exceeds upper limit of zero sensor is defective and should be replaced Sensor read
32. on Out put 4 0 mA be halted during Relay Test diagnostic mode EDIT to change Next to exit EDIT to continue Any other key to exit r ACTIVATE RELAYS Relay 1 OFF Relay 2 OFF Relay 3 OFF Figure 7 8 DIAGNOSTICS MENU OUTPUT SIMULATION allows setting the 4 20mA output to virtually any desired value This is useful for checking responses of devices receiving the GASMAX EC s 4 20mA output RELAY TEST is not supported on a GASMAX EC WARNING GAS MONITORING AND ALARM PROCESSING ARE NOT PERFORMED WHILE USING THE DIAGNOSTICS MENUS ACCESS REQUIRES A SPECIAL KEY SEQUENCE OF FOUR CONSECUTIVE UP KEYSTROKES SYSTEM SECURITY Page The System Security menu offers two levels of protection against operation by unauthorized personnel or those with malicious intent SYSTEM SECURITY 4 W Contact Name Secure Level LOW Pass Code Unlocked Figure 7 9 SYSTEM SECURITY MENU CONTACT NAME is a 12 character ASCII field available for displaying a phone or name of personal who knows the Pass Code Lost Pass Codes may be recovered by entering the locked security menu and holding the UP key for 5 seconds The 4 digit code appears near the bottom of the screen SECURE LEVEL sets LOW HIGH or OFF modes A LOW level allows CAL MODE sensor calibrations but requires the 4 digit Pass Code prior to altering menus HIGH level locks the entire menu databa
33. ors and applications these values should not be changed For remote simple sensors or for situations where a local Smart Sensor does not quite provide enough signal to successfully complete a SPAN calibration the Preamp gain can be adjusted using the UP DOWN keys GDS Corp does not recommend adjusting the Preamp Gain to any value higher than 85 WARNING A FULL CALIBRATION SHOULD ALWAYS BE PERFORMED AFTER ANY CHANGE IN THE PREAMP GAIN SETTING PGA Setup Gain 25 0 Counts 1011 Reading 100 Up Dn to Change Next to exit Figure 8 4 PREAMP GAIN SET MENU INPUT TYPE Local Smart Sensors automatically configure Input Type to match sensor requirements However when using remote sensors Input Type must be set manually Input Type is factory preset and should not be changed unless a different TYPE remote sensor is to be installed Input Type configures GASMAX EC hardware to accept bridge sensors positive coefficient electrochemical sensors negative coefficient electrochemical sensors or 4 20 mA inputs After selecting Input Type a SELECT EUNITS screen indicates the default engineering units for this sensor Page 35 GASMAX EC Operation amp Maintenance Manual Revision 3 5 Coefficient Electrochemical Sensor Type Default EUNITS Negative Hydrogen Sulfide ppm 25 Negative Oxygen Oxygen Negative Carbon Monoxide ppm CO Negative Bias Ammonia ppm NH3 Negative Bias Nitric Oxide ppm NO Negative Ethyle
34. others may have to be changed Contact GDS Corp for more information Normal Maintenance Normal maintenance for the GASMAX EC primarily involves periodic calibration on standard intervals GDS Corp recommends calibration at least every three months or more often if temperature extremes vibration the presence of incompatible gases or other environmental factors may accelerate the deterioration of the sensor element Calibration should also include inspections for clogged or wet sensor heads cracked or damaged enclosures and water incursion inside conduit or junction boxes Page 25 Main Menu GASMAX EC Operation amp Maintenance Manual Revision 3 5 GASMAX EC setup variables are stored in non volatile memory and can be modified by the end user to better match a particular application The GASMAX EC Main Menu tree is shown below To access the Main Menu swipe the magnetic wand over the EDIT key Pressing EDIT from either data display enters the LEL or EC SETUP PAGE 1 menu Key Sequence consecutive UI strokes LEL IMPUT 1 WeSustem Config Alarm Settings gt Sensor Information Clock Delays Diagnostics 2 HELP Instructions LEL INPUT 2 LCD Contrast Adi Modbus RS485 Port Security Technicians ONLY Smart sensor only Firmuare Rev 85 always Failsafe gt SENSOR SETUP INFO
35. ould be three conductor with foil shield and the wiring should be enclosed in metal conduit for maximum protection against interference If longer distance is required the GASMAX offers a sensor transmitter option for electrochemical sensors that converts the output into a 4 20mA signal Distances up to 500 feet are practical with 4 20mA signals Channel 1 on the GASMAX EC can be configured for direct echem or 4 20mA input IMPORTANT TOXIC SENSORS ARE SUBJECT TO ACCELERATED DETERIORATION IF POWER IS NOT SUPPLIED WITHIN 3 MONTHS OF SHIPMENT FROM GDS CORP Page 9 GASMAX EC Operation amp Maintenance Manual Revision 3 5 Power Input 10 30VDC at less than 0 75W Display 64 x128 pixel LCD with engineering units bargraph and 30 minute trend Input Accepts microamp level inputs from local or remote GDS Corp toxic or oxygen deficiency sensors Accuracy 5 of full scale typical Standard Two wire 4 20mA loop powered current sink with fault and overrange indication Output Maximum loop resistance is 600 ohms with standard 24VDC supply Temperature Electronics 40 C to 60 C See Echem Sensor Manual for additional details Memory On board non volatile memory retains all user settings Housing Aluminum housing with epoxy paint standard 316 stainless steel optional Dimensions Width 5 4 137 mm Height 8 203 mm Depth 5 127 mm Shipping weight 6
36. ow Trip NO K3 always Failsafe Latching EVENT LOG Edit 08 12 04 03 17 A1 IN 08 13 04 02 18 A3OUT B Display Event Log 08 12 04 03 51 A2 IN END OF LOG Clear Event Log 08 12 04 03 55 ACK Down 08 12 04 04 16 A20UT 08 12 04 04 23 A1OUT 08 12 04 15 00 A1 IN 08 12 04 16 43 10 08 13 04 02 08 A3 IN Figure 7 4 ALARM SETTINGS MENU SET POINT enters the engineering unit value where the alarm trips It may be negative and trip when monitored values fall out of range in this direction A3 has a default setting of negative 10 with Low Trip set for YES This makes it function as a FAULT alarm and trip when the monitored value falls to less than negative 10 It is important to adjust this value when the transmitter s span value is set for another value other than 100 For example a typical span setting for monitoring oxygen level is 25 therefore the fault level value should be adjusted to 2 5 which is equal to negative 10 of full scale DEAD BAND has a minimum value of 1 and a maximum value of 10 It is useful for preventing alarm cycling when the monitored value is hovering around the set point EXAMPLE With a range of 0 100 ppm if Dead Band equals 5 and the set point is 20 ppm after tripping at 20 ppm the value must drop below 15 ppm to reset ON DELAY allows entering a maximum 10 second delay before this alarm becomes active This is useful for preventing nuisa
37. pically used to indicate FAULT conditions that suggest sensor failure or out of measurement range conditions However some applications require a third level alarm The ALARM 3 menu is identical to ALARM 1 and ALARM 2 and may be set to trip at any level NOTE ALARM 3 WILL ALSO TRIP WITH MISSING OR FAILED SENSORS REGARDLESS OF THE PROGRAMMED LEVEL VALUE Sensor Replacement If a sensor shows FAULT does not respond to gas or can no longer be calibrated it should be replaced GASMAX EC monitors use GDS Corp type 10 95XX sensors where the XX is the gas type shown in Section 3 The range value should also be specified when ordering replacement sensors For example a replacement H2S sensor for 0 100 ppm would be 10 9515 R0100 To replace a sensor review Fig 6 2 and follow these steps See Fig 6 4 1 Declassify the area or remove power to the GASMAX EC 2 Unscrew the sensor head cover If unable to open the cover by hand use a Sensor Head Replacement Tool p n 10 0187 3 Remove the old sensor by pulling straight down NOTE DO NOT TRY TO UNSCREW THE SENSOR PULL STRAIGHT DOWN 4 Carefully install the replacement sensor by aligning the arrow on the sensor with the arrow engraved on the sensor head Push straight up until the sensor connector seats firmly into the sensor connector 5 Reinstall the sensor head cover by CAREFULLY screwing the cover onto the sensor head NOTE IF THE SENSOR FALLS OUT OF THE SENSOR HEAD DURING THIS
38. protection against interference or electrical surge the GASMAX EC enclosure and any conduit must be properly grounded Shielded wire is recommended for all low power signal runs Connecting Loop Power Signal Wiring To access the GASMAX signal power connections remove the cover on the GASMAX EC explosion proof enclosure Loosen the 2 thumbscrews holding the display assembly in place and remove it Route the power signal wires through the conduit entry and connect to green terminal block TB1 see Fig 4 3 Positive and negative wires are interchangeable The maximum distance 4 20 mA signals can travel is dependent upon several factors including the cable gauge DC power supply voltage level and impedance of the input of the receiving device Assuming a nominal 24 VDC power supply maximum total loop resistance is approximately 650 ohms Two wire 4 20mA Loop O O Mounting Assembl 8 Display Assembl S O O O 51 Ribbon to Display CTR REF ri 997 6 Local Toxic Sensor Cable from sensor head connects to S1 on back of display assembly Figure 4 3 GASMAX EC Loop Power Wiring Page 13 GASMAX EC Operation amp Maintenance Manual Revision 3 5 Local Smart Sensor Local toxic sensors are factory installed in a sensor head directly attached to the GASMAX EC enclosure Local toxic sensors are always connected to the Smart Sensor connector S1 located on the back of the
39. ry table of values and are automatically uploaded to the GASMAX EC from the smart sensor This menu item is not accessible unless a temperature compensated local Smart Sensor is installed BACKUP CONFIG allows users to store the entire current GASMAX EC menu database into non volatile memory for restoration later if incorrect values are accidentally entered or uploaded RESTORE CONFIG restores the GASMAX EC menu database to the values from the most recent Backup Config This menu item is only available if a smart sensor is not installed The special keystroke sequence of 4 consecutive UP keys is also required to perform backup and restore operations UPLOAD SENSOR DATA allows the user to manually upload the entire smart sensor database to the GASMAX EC from the smart sensor CAL MARKER allows the user to set the 4 20mA output value that is transmitted during ZERO and SPAN calibration This setting is limited to between 3ma and 20mA and is a useful way to indicate to a GDS controller that the unit is in CAL MODE TX SENSOR LIFE causes the GASMAX EC 4 20mA output to transmit a sensor life value after the completion of a successful calibration cycle During normal operation the GASMAX EC transmits a 4mA signal during the CAL PURGE delay to allow time for the span gas to dissipate With TX Sensor Life YES the GASMAX EC transmits 4mA for the first 10 seconds then for 5 seconds transmits a value between 4mA and 5mA with 4mA equal to 0 sensor life and
40. s the reading to be displayed when 20mA 100 is the GASMAX EC output The highest reading allowed is 9999 including negative polarity sign Polarity is only indicated for negative readings DECIMAL POINTS set the resolution of the LCD readings and may be set for 0 1 or 2 For example ZERO readings for 0 1 amp 2 decimal points displays as 0 0 0 amp 0 00 CAL SPAN VALUE sets the engineering units value of the calibration gas GDS Corp recommends that the calibration gas value be between 2596 and 7596 of full scale Calibrating at 10096 of scale is not recommended READOUT DEADBAND forces low values to continue to read zero This is useful when there are small amounts of background gases that may cause fluctuating readouts The highest amount of deadband allowed is 596 NOTE THE 4 20MA OUTPUT IS NOT AFFECTED BY THIS SETTING TRACK NEGATIVE allows the display to show negative values when set to YES This can be helpful when troubleshooting sensor problems The default setting is NO and forces the display to read 0 if Page 27 GASMAX EC Operation amp Maintenance Manual Revision 3 5 the sensor value drops below zero However negative sensor outputs will always cause the Fault alarm to trip The 4 20mA output always locks at 4mA when the reading drifts negative TEMP COMPENSATION adjusts sensor output based on ambient temperature GDS Corp temperature compensated sensors are preprogrammed with the necessa
41. se and the CAL Mode until the correct Pass Code is entered LOW and HIGH security levels always allow static viewing of configuration menus Page 32 GASMAX EC Operation amp Maintenance Manual Revision 3 5 The TECHNICIANS MENU group consists of the XMITTER CONFIG menu and TECHNICAL PAGE menu These menus contain items that are typically factory configured depending upon the type sensor and input connected Care should be used when modifying these variables as some items will prevent proper operation and could endanger personnel Access requires a special key sequence of four UP keystrokes to prevent accidental modification of critical items XMITTER CONFIG Menu The XMITTER CONFIG menu is used to activate channels precisely calibrate 4 20mA outputs and set time date To access the XMITTER CONFIG menu press and hold the NEXT key for 5 seconds until the screen appears requesting the special key sequence WARNING TARGET GAS MONITORING AND ALARM PROCESSING ARE NOT ACTIVE WHILE IN THIS MENU XMITTER CONFIG Enter Key Sequence B 02 TOXIC ON HOLD to access JOE PRESS LEL CURRENT ON NEXT KEY UP KEY Out put Zero 5 SECONDS NEXT key to Exit 4 TIMES aie ot Span Real Time Clock 5 See Manual HELP Model ST 48 BackLight ON Figure 8 1 XMITTER CONFIG MENU O2 TOXIC when set to YES enables the Oxygen Toxic channel LEL CURRENT is not available in the GASMAX EC OUTPUT ZERO SP
42. t comply with all applicable restrictions requirements and guidelines for said hazardous areas It is the end user customer s final decision to ensure that the GASMAX EC is suitable for the intended use e The GASMAX EC is designed and constructed to measure the level of certain gases in ambient air Accuracy in atmospheres containing steam or inert gases cannot be guaranteed e Always mount the sensor head vertically with the sensor head facing down e Do not paint transmitter or sensor assembly e Do not operate the GASMAX EC if its enclosure is damaged or cracked or has missing components Make sure the cover internal PCB s and field wiring are securely in place before applying power e Do not expose the GASMAX EC to electrical shock or continuous severe mechanical shock Protect the GASMAX EC and related sensor assemblies from dripping liquids and high power sprays e Calibrate with known target gas at start up and check on a regular schedule at least every 90 days More frequent inspections are encouraged to spot problems such as dirt oil paint grease or other foreign materials on the sensor head e Periodically test for correct operation of the system s alarm events by exposing the monitor to a targeted gas concentration above the High Alarm set point e Use only for applications described within this manual Page 8 GASMAX EC Operation amp Maintenance Manual Revision 3 5 Introduction The GASMAX EC is a singl
43. tted with any CSA certified compatible XP toxic sensor head The hazardous location installa tion is limited to an area govemed by the lowest group rating of the assembly s parts 9 Warning Substitution of components may impair intrinsic safety 10 Aconduit seal within 18 inches of the enclosure is not required for Intrinsically Safe installations Control Equipment s 3 1 13 GDS Corp 2513 Hwy 646 Santa Fe Texas 77510 409 927 2980 GASMAX EC Intrinsically Safe Installation SIZE PART DRAWING NO REV A GDS 11 0100 EC Figure 4 6 GASMAX Intrinsically Safe Installation Initial Setup Once installed apply power to the GASMAX EC and verify that the LCD display is active Certain sensors may initially indicate off scale high or low values but should quickly return to zero if no target gas is present During this warm up delay period the 4 20mA output is held at 4 0 mA to eliminate false alarms in any receiving devices Warm up delay is one of the user adjustable parameters see Section 6 Once operational the user should verify the following settings prior to initial calibration 1 Local time and date Check date value and adjust time for proper time zone Sec 6 5 2 Tag name or Engineering Units settings Edit values as necessary Sec 6 2 3 CAL SPAN GAS value Set to match concentration of calibration gas cylinder Sec 6 2 Page 16 GASMAX EC Operation amp Maint
44. y Screen The TREND display shows a graphical representation of the most recent 30 minute trend The Alarm 1 level is shown as a closely spaced dotted line and the Alarm 2 level is shown as a widely spaced dashed line Figure 6 3 GASMAX TREND Display Screen Normal Operation During normal operation the GASMAX display shows the current gas reading in direct calibrated engineering units If the reading goes above the Alarm 1 or Alarm 2 values the front panel display LEDs will flash The 4 20mA output current sink will transmit a value that represents the of scale shown onj the display If the sensor malfunctions or is removed the Fault LED will illuminate and the message FAULT will appear on the display screen Alarm Operation ALARM 1 and 2 GASMAX EC s have front panel LED indicators for ALARM 1 and ALARM 2 Both alarm indicators can be set to activate above or below a given engineering units set point Alarm processing will trigger an alarm Page 22 GASMAX EC Operation amp Maintenance Manual Revision 3 5 condition when the input exceeds the programmed value and includes hysteresis to keep the alarm from rapidly switching ON and OFF if the input remains close to the programmed alarm value NOTE GASMAX EC ALARM SETTINGS AFFECT THE OPERATION OF THE FRONT PANEL LEDS ONLY SEPARATE ALARM SETTINGS MAY NEED TO BE PROGRAMMED IN THE 4 20MA RECEIVING DEVICE Alarm Operation ALARM 3 ALARM 3 is ty
Download Pdf Manuals
Related Search