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GDS TRANSMAX EC User Manual

1. Section 6 3 describes reading and setting sensor volts using the TRANSMAX LCD display The voltage displayed on the LCD is monitored across TB1 REF and TB1 ACT on the TRANSMAX Power Supply board and may be confirmed with a voltmeter This TB 1 value is correct for locally mounted sensors only sensors mounted more than a few feet away from the TRANSMAX monitor may receive a lower voltage due to the voltage drop across sensor wiring Remote mounted sensors must have their sensor voltage across ACTIVE and REFERENCE beads measured AT THE SENSOR end of the cable The TRANSMAX seiting will require a higher value in order to achieve the correct voltage at the sensor Correct sensor voltage should be confirmed after start up for locally and remotely mounted bridge style sensors Initial Catalytic Bead LEL Monitor Balance Check Bridge style sensors require a balance adjustment after installation Section 6 3 describes using the LCD to read and adjust BALANCE settings Correct BALANCE setting should be confirmed after start up for locally and remotely mounted catalytic bead sensors 28 TRANSMAX Gas Monitor Instruction Manual Revision 1 0 Initial Catalytic Bead LEL Monitor Span Check Prior to the initial Routine Sensor Calibration described in section 4 1 a coarse SPAN gas reading verification should be performed after installation After correct Sensor Volts and BALANCE have been verified apply an upscale gas value such as 50 LEL
2. The TRANSMAX Gas Monitor features a NEMA 4X rated polycarbonate enclosure with transparent removable cover To remove the cover unscrew the four stainless steel cover screws located at each corner Modular design simplifies the installation of the TRANSMAX Gas Monitor Once the cover is removed the Display Assembly mounted with captive thumbscrews is easily removed to allow access to field wiring terminals An optional 10 0234 Alarms amp MODBUS board mounts piggyback to the back of the Display Assembly If the unit is a TRANSMAX II a 10 0233 I O Power Supply board is mounted to the rear of the case assembly and connects to the Display Board via a short ribbon cable WARNING Qualified personnel should perform the installation according to applicable electrical codes regulations and safety standards Insure correct cabling and sealing fitting practices are implemented to maintain watertight integrity if mounted in an area where rain water spray or moisture is present WARNING Do not install the sensor pointing upward 12 4 Gps TRANSMAX Gas Monitor Instruction Manual Revision 1 0 4 4 TRANSMAX EC Wiring Unscrew the cover on the TRANSMAX EC explosion proof enclosure by removing the four stainless steel screws located at each corner Loosen the 2 thumbscrews holding the display assembly in place and remove it ee F Electrochemical Sensor Wiring EC Channel The local electrochemical sensor connects to the TRANSMAX EC di
3. UP DN to Change fEFO Cal Wal H HEST to Exit SENSOR BALANCE amp SENSOR VOLTAGE menus are only active when input type m TECHHICAL FAGE 2 A SENSOR VOLTAGE Cat Bead 3 Wire WebRau Min nts ll N olts 2 Ad Rau Max nts 1608 UD DH to Change HET to Exit WARMING High voltage May damage sensor Previous Calibration Will be erased EDIT Gain Unity EDIT to confirm HEST to exit PGA SETUP Gain 25 04 Counts 1611 Reading 164 Ure Dr to Change Hext to exit SELECT INPUT 7 r SELECT EUNITS Cat Bead 3 Wire gt LEL E L Custom J UP DON to change EDIT to select HEAT to exit EDIT Figure 13 Technicians Menu Tree If it is determined the Preamp Gain value is incorrect apply the desired up scale input and use the UP DOWN keys to obtain the correct Reading value Counts are the 10 bit binary A D value with an active range value of 0 1023 CAUTION For standard installations this is a factory adjustment Do not use the Preamp Gain Set menu for calibrating sensors It should only be adjusted if a new measurement gas or input range is required Input Type If changing sensor type TRANSMAX inputs must be configured manually using the Input Type menu Input Type configures the TRANSMAX hardware to accept bridge style sensors positive coefficient electrochemical sensors negative coefficient electrochemical sensors or 4 20 mA
4. severe mechanical shock TRANSMAX Gas Monitor Instruction Manual SAB one Revision 1 0 e Protect the TRANSMAX Gas Monitor from dripping liquids and high power sprays e Use only for applications described within this manual 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 DINSTRUCTIONS EN ENTIER AVANT D UTILISER D ENTRETENIR OU DE REPARER L EQUIPEMENT GDS Corp Contact Information GDS Corp is always interested in receiving feedback on our products and services If you wish to contact GDS Corp for any reason the contact information is shown below GDS Corp 2513 Hwy 646 Santa Fe Texas 77510 USA 409 927 2980 409 927 4180 Fax info gdscorp com support aqdscorp com www gdscorp com TRANSMAX Gas Monitor Instruction Manual Revision 1 0 This Page Intentionally Left Blank es TRANSMAX Gas Monitor Instruction Manual GP eo Carp Revision 1 0 Table of Contents WARRANTY eege Ea 2 IMPORTANT SAFETY INFORMATION cceeecseeeeeenseeneeeeees 2 GDS Corp Contact Information c csceeeeseeeeseeeeneeenseeeeneeeenees 3 BR e e TT d NEE D 1 1 TRANSMAX Family OvervieW sasnnnnnnnnnnnnnnnnnnnnnnnnnnnnn
5. 20mA outputs active Either input may be turned or of off independently Output Zero Output Span Trim The Output Zero Output Span menu entries allow precise adjustment of the 4mA and 20mA output set points To trim these values attach a precision milliamp meter to the 4 20mA output being used and select the correct OUTPUT ZERO TRIM Use the UP DOWN keys to trim the milliamp value to 4 00mA Next enter the correct OUTPUT SPAN TRIM menu and use the UP DOWN keys to trim the milliamp value to 20 00mA Press the NEXT key to exit this menu The TRANSMAX stores these new D2A values in nonvolatile memory OUTPUT ZERE TRIM OUTPUT SPAH TRIM 197 DZA COUNTS UPF DOWH to change 998 DZA COUTTS UF DOWH to change HEST to Exit HEAT to Exit Figure 12 Output ZERO SPAN Trim Menus 27 TRANSMAX Gas Monitor Instruction Manual SAB ond Revision 1 0 6 3 Electrochemical Sensor Installation Procedure Electrochemical sensors output a very low level analog current signal that must be amplified and filtered The signal conditioning circuitry in the TRANSMAX Echem channel includes both analog and digital processing While the CALIBRATION procedure fine tunes the digital gain and offset values the SPAN check described below establishes the correct analog preamp gain necessary to maximize the A D converter input range This adjustment is normally done at the factory and should only be required if converting
6. Binary Cal Data Chan 1 A2D MIN 41041 4 NA Chan 1 A2D MAX 41042 4 NA Chan 1 D2A MIN 41043 4 NA Chan 1 D2A MAX 41044 4 NA Chan 2 A2D MIN 41045 4 NA Chan 2 A2D MAX 41046 4 NA Chan 2 D2A MIN 41047 4 NA Chan 2 D2A MAX 41048 4 NA 36
7. CLOCK DELAY SETUP m CALIBRATION DATES gt Time 1235142 Record 22 of 22 Date B4 22 84 CAL Date B4 b5 H4 Warm Up Sec 188 Cal Purge Sec 168 UP DOWH to scroll HEXT to EXIT COHTRAST SMART SEWSOR HERE to change LPa Cat Bead SMART SENSOR info menu only Sera a available with Smart sensor installed HEST to EXIT SH NNN Born One LD DD 04 Last Cal LD 22 DA ee OWY keus to Exit oe kkk WARMING aka DIAGHOSTICS OUTPUT STINULATOR Enter Key Sequence Al ing will Lo access menu TIMES e Halted during Sa E nee Output ta omh NEXT ron Exit diagnostic mode EDIT to change EDIT to continue Hest to S See Manual lt HELP Ars other to exit SYSTEM SECURITY ACTUATE RELAYS BR Contact Name 3 Secure Level LOW fe E Pass Code Felay 3 OFF 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 Configuration Menu Tree 21 TRANSMAX Gas Monitor Instruction Manual d p GDS Revision 1 0 5 5 System Configuration Page Measurement Name may be edited to contain virtually any 16 character ASCII field It is typically used to describe the monitored point by user tag or other familiar terminology Eunits engineering units may have up to a 10 character ASCII field
8. 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 TRANSMAX GAS MONITOR output Span 100 defines the reading to be displayed when 20mA 100 is the TRANSMAX GAS MONITOR output The highest reading allowed is 9999 includes negative polarity sign and one decimal point Polarity is only indicated for negative readings Decimal Points sets the resolution of the LCD readings and may be for 0 1 or 2 Example ZERO readings for 0 1 amp 2 DP s respectively are 0 0 0 amp 0 00 Cal Span Value sets the value for the calibration gas to be applied when performing Span calibrations This value should be approximately 50 of the full scale value Readout Deadband forces low values to continue to read zero This is useful when there are small amounts of background gases that cause fluctuating readouts above zero The highest amount of dead band allowed is 5 The 4 20mA output is not affected by this menu item Track Negative set to NO causes negative values to read the Zero 0 value in data displays The CAL MODE readout displays negative values regardless of this setting and negative values below the Fault set point will still cause the Fault alarm to trip The 4 20mA output always locks at 4mA when the reading is negative Linearization Data allows
9. access menu MES BPLinesrize 7 HO Sensor Information Zero Bs Eunits Linearization Data gt SHOR Data Point 1 Clock Delays Span 108 Eunits Backup Config gt HEST kes to Exit 7o Input 18 88 Diagnostics Decimal Points a Restore Config A a Dutrut 18 88 HELF Instructions Cal Span Wal Se Upload Sensor Data See Manual HELP TH Sensor Life WO Simple Sensor Installed Smart Sensor Installed o 5 SETTINGS AL SETUP harp 2 9m Modbus R5485 Port a J EE SE ecurity z e Alarm 3 Fail gt ON Delay HS Technicians OHLY Relaw Config OFF belay am Firmware Rew Prent Le gt Green We EVENT LOG Edit 68712704 D nz Al IN BP Cisrelay Event Log oa ce oe Ge Clear Event Log lee B8el2 H4 4 16 AZOUT Sensar Temp menu anly present RS485 MODBUS SETUP m RELAY CONFIG oeriz 4 D DOUT with Arctic smart sensor installed k 0712704 15 46 Al IH See section 7 1 a ater ae Se l See Kl 08712704 16 143 ALOUT au zate ailsate 58713704 02 58 AS IH Parity Horne Ki Acknowledge HO i 7 Stor Bit 1 K Refresh DFF Down ES always Failsafe v 8 13 84 82515 AJOUT INSTALL SENSOR menu not available with Smart sensor installed TTTEND OF LOG SENSOR SETUP INFO Al INSTALL SENSOR INSTALL SENSOR Teste Sere A les EDIT to install Historical CAL data lee e Hew Sensor EDIT Will be Deleted Hew Sensor B1 28 84 Ana other key EDIT to Accert E Cal aoe to Exit HEST to Abort ensor Life m
10. companion to the TRANSMAX II in this configuration is the GDS 49 a remote sensor transmitter that converts low level electrochemical sensor output to non calibrated 4 20mA current II TRANSMAX Gas Monitor Instruction Manual J 5 Revision 1 0 4 0 Installation amp Initial Setup 4 0 Unpacking amp Setup Open the package carefully check for damage and make sure all accessories listed on the packing slip are present These should include but are not limited to magnetic wands manuals and Quickstart guides 4 2 Location Considerations Factors such as air movement gas density in relation to air emission sources and environmental variables should be taken into account when determining 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 when appropriate sensors should be placed next to valves seals and other likely leak sources 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 centimeters above the potential gas leak and heavier than air gases should be this distance below Even though the TRANSMAX Gas Monitor is designed for rugged service sensors should be protected from environmental damage from water snow shock vibration and dirt 4 3 Mounting amp Orientation
11. inputs Bridge style and 4 20mA inputs require the TRANSMAX II configuration NOTE Additional factory installed solder bridge modifications are required for 4 20mA inputs see Addendum 2 Positive Negative coefficient electrochemical sensors have several gas types available within each group Biased EC sensors may require factory 30 Echt i installed solder bridge SB1 on the Display Assembly board Electrochemical Sensor Type Default EUNITS TRANSMAX Gas Monitor Instruction Manual Revision 1 0 Coefficient Negative Negative Negative Negative Bias Negative Bias Negative Negative Negative Negative Negative Negative Negative Negative Negative Negative Positive Positive Positive Hydrogen Sulfide Oxygen Carbon Monoxide Ammonia Nitric Oxide Ethylene Oxide Hydrogen Chloride Hydrazine Arsine Sulfur Dioxide Hydrogen Hydrogen Cyanide Phosgene Phosphine Hydrogen Fluoride Nitrogen Dioxide Ozone Chlorine ppm H2S Oxygen pom CO ppm NH3 pom NO ppm Eth O2 pom HCL ppm N2H4 ppm Arsine ppm SO2 ppm H2 pom HCN ppm COCI2 ppm PH3 ppm HF ppm NO2 ppm Ozone ppm Cl2 Figure 14 Sensor Default Values Zero Cal Value menu entry allows the zero calibration value to be set for something other than a zero reading For example a TRANSMAX GAS MONITOR 4 20mA input may represent a BTU Analyzer range of 500 1000 BTU s In this case 0 of full scale equals 500 BTU s a
12. internally amp TB2 2 connects to TB2 6 internally to simplify arrive depart cabling TB2 3 is no connect for cable shield continuation FIGURE 5 TRANSMAX II Isolated 4 20mA Output Board 16 4 Gps TRANSMAX Gas Monitor Instruction Manual Revision 1 0 ee F 4 8 Initial Checkout amp Calibration Apply power to the TRANSMAX and allow the unit to stabilize for at least one hour Certain sensors may require additional time for warm up Monitor the display or 4 20mA output periodically to determine when the reading has stabilized Although the unit has been calibrated at the factory prior to shipment GDS Corp highly recommends the unit be calibrated after installation to ensure that no internal damage occurred during shipment and to ensure that the complete end to end system is operating properly See Section 5 3 for a detailed step by step calibration procedure If it is necessary to install a new sensor see Section 6 3 or 6 4 for replacement sensor installation procedure 17 es TRANSMAX Gas Monitor Instruction Manual GP eo Carp Revision 1 0 5 0 General Operation 5 1 User Interface The TRANSMAX interface uses four magnetic switches labeled UP DOWN NEXT and EDIT to provide access to all functions These magnetic switches are arranged around the perimeter of the graphic display screen A magnetic wand supplied with the TRANSMAX is needed to active the magnetic swit
13. source TM II Options Option Board 10 0233 with 3X Local 5A resistive Form C relays with MODBUS interface Relay 1 and Relay 2 level alarms are configurable for HIGH or LOW trip normally energized Failsafe or normally de energized latching or non latching Relay 3 is always normally energized for failsafe operation so loss of power to the TRANSMAX GAS MONITOR II will be indicated as a FAULT condition CAUTION Relays are rated for RESISTIVE loads Inductive loads such contactor coils or motors may cause contact arcing which emits RFI into the sensor signals Use appropriate snubbers and MOV s across inductive loads and keep relay wiring away from signal wires 2 2 Mechanical Specifications Length Width Height Enclosure Rating 4 8 122 mm 4 7 120 mm 3 7 95 mm Polycarbonate with polyurethane gasket stainless steel screws NEMA 4X IP66 67 ingress protection TRANSMAX Gas Monitor Instruction Manual Revision 1 0 2 3 Electrical Specifications TRANSMAX JEC Voltage Power Input Output Loop R 10 to 30 volts DC Less than 0 75W in two wire configuration Accepts micro amp signals from GDS Corp toxic oxygen sensors 4 20mA current sink two wire non polarized 650 ohms maximum in 2 wire mode 2 4 Electrical Specifications TRANSMAX II Voltage Power Input Output 10 to 30 volts DC Depends on sensor typically less than 3W at 24VDC Accepts micro amp signals
14. the TRANSMAX from one sensor type to another Initial Toxic Oxygen Monitor Span Check Any time a new type of sensor is installed a coarse SPAN reading verification should be performed Enter the Technicians Only menu and select PREAMP GAIN SET Apply a calibration gas rated at least 50 of the sensor full scale range and monitor the reading shown on the display The indicated value should read within 15 of the desired value if it does not adjust the PREAMP GAIN using the UP and DOWN keys until the value is within 15 Remember that this is only a coarse check and must be followed by a Calibration sequence using a reference calibration gas 6 4 Bridge Style Sensor Installation Procedure Bridge style sensors use a Whetstone bridge configuration to measure small differences between active and reference sensor elements The signal conditioning circuitry in the TRANSMAX Bridge channel includes the ability to set the excitation voltage bridge balance and rough gain value When installing a new local or remote bridge style sensor the following procedure must be performed Sensor Voltage Adjustment Bridge style sensors require an excitation voltage to operate properly This voltage must be set to match the sensor technology if the sensor is installed remotely the voltage must be adjusted to compensate for voltage loss in the sensor wiring CAUTION Sensor Volts in excess of the rated values may destroy catalytic bead sensors
15. H 08713704 8218 ABOUT B Gisrlau Event Log kel ee ie e4 03 51 Az IH EHD OF L G Clear Event Log HS 12 84 03 55 ACK opd G4ne azout Down HB 1l2 04 849235 ALOUT 08712704 15 00 AL IH 08712 704 16 43 ALOUT O 2 08 as IN Figure 9 Alarm Settings Menus 23 TRANSMAX Gas Monitor Instruction Manual Revision 1 0 Set Point sets the engineering unit value where the alarm trips It may be negative and alarm will trio when monitored values fall below the set point Alarm 3 is default configured for negative 5 of range with Low Trip making it a FAULT alarm that will trip when the monitored value is more than 5 below the minimum expected value 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 nuisance 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 th
16. MART EC SENSOR Ribbon to 3 Wire 4 20mA UO Power SupplyPCB req d for CatBead backlit LCD amp Alarms RS485 option Smart electro chemical sensor input Ribbon to optional UO Power Supply PCB req d for 3 wire 4 20mA Alarms Modbus amp LEL sensors Simple electrochemical sensor input FIGURE 1 TRANSMAX EC DISPLAY BOARD 13 TRANSMAX Gas Monitor Instruction Manual Revision 1 0 4 5 TRANSMAX II Wiring Unscrew the cover on the TRANSMAX EC enclosure by removing the four stainless steel screws located at each corner Loosen the 2 thumbscrews holding the display assembly in place and remove it A small ribbon cable is attached with sufficient length to allow access to the I O Power Supply board mounted in the bottom of the enclosure Electrochemical Sensor Wiring Channel 1 The local electrochemical sensor connects to the TRANSMAX EC display board via TB2 SIMPLE EC SENSOR Remote electrochemical sensors are not supported Catalytic Bead Bridge Sensor Wiring Channel 2 A local or remote bridge type sensor connects to the 10 0233 I O Power Supply board via TB1 Output Signal Wiring The 4 20mA signal output wires connect to the 10 0233 I O Power Supply board display board via TB2 Maximum wiring size is 12 AWG Plus 24VDC is connected to TB2 1 and power supply common is connected to TB2 4 A blocking diode protects the TRANSMAX if polarity of the power supply is reversed but it will
17. P The RS 485 MODBUS SETUP menu allows setting the RTU address if RS 485 equipped for each TRANSMAX gas monitor on the RS 485 network Each TRANSMAX GAS MONITOR must have a different RTU address when communicating on the same 2 wire cable Baud rate Parity and Stop Bit are fixed at industry standard values of 9600 baud no parity and one stop bit 5 13 MODBUS REGISTER AND FUNCTION CODE SUMMARY The following table identifies TRANSMAX gas monitor MODBUS register locations and function codes Chan 1 designations represent the EC channel while Chan 2 represents the LEL 4 20mA Input channel Min and Max calibration points for the A D and D A converters 5 14 SYSTEM SECURITY The SYSTEM SECURITY menu offers two levels of protection 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 database and the CAL Mode until the correct Pass Code is entered LOW and HIGH security levels always allow viewing of configuration menus but they may not be changed Contact Name is a 12 character ASCII field available for displaying a phone or name of personal who know 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 26 TRANSMAX Gas Monitor Instruction Manual Revision 1 0 6 0 Advanced Settings and Procedures 6 1 Introducti
18. RT 3 Heu Sensor 61 76 4 Recent Cal 84 85 H4 Sensor Life EDIT Any other key to Exit CALIBRATION DATES Record 23 ot 22 CAL Date 84 65 84 UP DO to scroll HEST to EIT SMART SENSOR Tyre Cat Bead 168 Feros H HHHMH Born One Al 26 b4 Last Cal A4 85 84 AHY key to Exit Figure 10 Sensor Information Menus Install New Sensor should always be performed when a new simple sensor is installed This deletes historical CAL data and sets sensor life to 100 after initial calibration of the new simple sensor The TRANSMAX GAS MONITOR 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 TRANSMAX GAS MONITOR is configured to accept and is typically pre configured at the factory There are five Input Type possibilities consisting of Cat Bead EC negative EC positive 4 20mA and Smart Smart sensors upload sensor type and other data to the TRANSMAX GAS MONITOR and 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 5 8 CLOCK DELAY SETUP Since the TRANSMAX GAS MONITOR is eq
19. Revision 1 0 NOTE TRANSMAX gas monitor alarm indicators LEDs function with or without the presence of the Relay MODBUS Output board The TRANSMAX EC alarm LEDs always flash to indicate an alarm condition while the TRANSMAX II alarm LEDs initially flash and then become steady ON after an operator acknowledges the alarm by activating the UP RESET key NOTE The A3 alarm is typically dedicated to FAULT conditions indicating sensor failures or out of measurement range conditions However some applications require a third level alarm The A3 menu is identical to A1 amp A2 and may be set to trip at an upscale level value A3 WILL ALSO TRIP WITH MISSING OR FAILED SENSORS REGARDLESS OF THE LEVEL VALUE 5 3 Calibration DOWN CAL Key Activating the DOWN CAL key while in any display mode will cause the TRANSMAX to ask the user if a CALIBRATION is desired If so the EDIT key must then be pressed within 5 seconds or the previous display mode is reactivated Calibration is the most important function to ensure correct operation of the TRANSMAX gas monitor The CAL MODE is designed to make calibration quick easy and error free A successful ZERO and SPAN calibration requires only four keystrokes The 4 20mA output transmits 3mA during CAL MODE and 4mA during the subsequent CAL PURGE delay to prevent external alarms during calibration Local TRANSMAX alarm relays if equipped are inhibited during CAL MODE CAL MODE automaticall
20. S 31001 31002 TO CREATE READINGS THAT MATCH TRANSMAX GAS MONITOR DISPLAY VALUES THESE SHOULD ALSO BE READ BY C1 MODBUS MASTERS A2D Raw Chan 1 31003 4 NA A2D Raw Chan 2 31004 4 NA 10 bit value representing the A2D value of 0 to 1023 before calibration constants are applied Status Registers Chan 1 Status 31005 4 NA Chan 2 Status 31006 4 NA 16 bit status words bit assignment for each channel ALARM1_BELOW BITO ALARM2_BELOW BIT1 ALARM3_BELOW BIT2 ALARM1_LATCH BITS ALARM2_LATCH BIT4 ALARM3_LATCH BIT5 ALARM3_ACTIVE BIT6 CHANNEL_DISABLED BIT7 CHANNEL CAL BIT8 CHANNEL _LINEARIZE BIT9 FAULT RELAY LATCH BIT10 DISPLAY_NEGATIVE BIT11 TRANSMIT SENSOR LIFE ENABLED BIT12 33 Echt i 4 Gps TRANSMAX Gas Monitor Instruction Manual Revision 1 0 Alarm Status Word 31007 4 NA 16 bit status word bit assignment for system status CH1_ALM1 BITO CH1_ALM2 BIT 1 CH1_FAULT BIT2 CH ALAM1 BIT4 CH ALM2 BIT5 CH2 FAULT BIT6 K1_STATUS BIT8 K2 STATUS BIT9 K3_ STATUS BIT10 Transmitter Status Word 31008 4 NA 16 bit status word bit assignment for system status CHAN_1_ACTIVE BITO CHAN_ 2 ACTIVE BIT 1 SECURE_LEVEL BIT2 MARKER Tx LED BIT3 K1_FAILSAFE BIT12 K2 FAILSAFE BIT13 K2 ACK BIT14 LOCK BIT15 Sensor Life Chan 1 Sensor Life 31009 4 NA Chan 2 Sensor Life 31010 4 NA 16 bit signed integer ranging from 1 to 100 where 1 indicates Cal Required Temperature Chan 1 Sensor Temperature 31011 4 NA Ch
21. SMAX II can be configured to recognize these inputs and take action by displaying a message or generating a fixed output value Once detected the TRANSMAX II transmits a constant mA output equal to the Marker value Entering YES in the Marker Active menu also activates Marker TX LED Mark Level and Mark As menus Mark Level allows entering the lt 3 75mA value 2mA to detect Mark As allows entry of the up to 10 digit ASCII message the LCD readout will display when the Marker is detected Marker TX LED menu YES causes the front panel TXD LED to also illuminate when the Marker is detected Important Optional 10 0234 RS 485 MODBUS port will not function if Marker TX LED menu must YES 32 cna TRANSMAX Gas Monitor Instruction Manual d Corp ac Revision 1 0 APPENDIX 1 MODBUS REGISTERS VARIABLE REGISTER READ FC WRITE FC Read Only Discrete Chan 1 Alarm 1 2001 2 NA Chan 1 Alarm 2 2002 2 NA Chan 1 Fault 2003 2 NA Chan 2 Alarm 1 2004 2 NA Chan 2 Alarm 2 2005 2 NA Chan 2 Fault 2006 2 NA K1 2007 2 NA K2 2008 2 NA K3 2009 2 NA Chan 1 Cal Mode 2010 2 NA Chan 2 Cal Mode 2011 2 NA Read Write Coils Alarm Ack Reset 12001 1 5 Note After writing a TRUE to this register it resets back to FALSE automatically Read Only Registers D2A Raw Chan 1 31001 4 NA D2A Raw Chan 2 31002 4 NA Calibrated 10 bit value representing the D2A value of 0 to 1023 for 25 to 105 FS 200 0 amp 1000 100 IMPORTANT READ REGISTER
22. TRANSMAX EC Wiring ass snnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn nnmnnn eer 13 AS TRANSMAX I WINN E 14 4 6 TRANSMAX II Alarm MODBUS Board ccc teccceeeeeeeeeeeeeeeeeeeeeeeeesneeeeeeeeneneneeeeees 15 4 7 2 TRANSMAX II Isolated 4 20mA Output Board 00 ccccceeeeeeeeseeeeeeeeeeeeeeeeeeeeeeeees 16 4 8 Initial Checkout amp Calibration ssssssnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn nnmnnn 17 Sz TRANSMAX Gas Monitor Instruction Manual Revision 1 0 5 0 General ODEl AO lt sce siccecti cen E AE 18 5 1 SOR MINCE ACS sin a 18 5 1 Display Modes NEXT Key ccccssssseecscessseeeeeceesseeesseeesseeeeeeesseeessoeaseesseoensseessons 18 52 EISE UNI eege 18 5 3 Calibration DOWN CAL Key sicvcccvicesccsrandiccstestniceceisivenusssuvivesundvavctasveuesaidiinueweue 19 5 4 System Configuration Menu EDIT Key ccccssssssssseeeeeseceessseeeeseeceenseseeeees 21 5 5 System Configuration Page ssgetgegegbeeee ege kueNEegegEee NEEN ege 22 55 Alarm Settings GL 23 56 Beiatzonhe tere 24 E GE NET tel Ee LE 24 5 8 CLOCK DELAY KT 25 5 9 LCD Contrast E d En VC 26 510 FUP SE COI onore a 26 S ve Ile E de 26 512 R9485 MODBUS RT 26 5 13 MODBUS REGISTER AND FUNCTION CODE SUMMARY cccccceessseeeseeeees 26 514 SYSIEM SECURITY E 26 6 0 Advanced Settings and Procedures ccsesseseeseeeeseeeees 27 6 1 andeo Uls iTe g asec reece tine
23. TRANSMAX Gas Monitor Instruction Manual Revision 1 0 Operation amp Maintenance Manual TRANSMAX Product Family TRANSMAX EC Toxic Oxygen Loop Powered Gas Monitor for Non hazardous Locations TRANSMAX Il Single or Dual Powered Gas Monitor for Non Hazardous Locations Important Read and understand contents of this instruction manual prior to use Improper use of equipment could result in instrument malfunction or serious injury AUTHORIZED DISTRIBUTOR GasDetectorsUSA com Houston Texas USA sales GasDetectorsUSA com 832 615 3588 TRANSMAX Gas Monitor Instruction Manual Revision 1 0 WARRANTY GDS Corp warrants the TRANSMAX Gas Monitor to be free from defects in workmanship and materials under normal use for a period of two 2 years from the date of shipment Final determination of the nature of and responsibility for defective equipment will be made by GDS Corp personnel Defective or damaged equipment must be shipped prepaid to GDS Corp or the factory representative from which it shipped originally In all cases this warranty is limited to the cost of the equipment supplied by GDS Corp The customer will assume all responsibility for the misuse of this equipment by its employees or other personnel All warranties are contingent upon correct use in the application for which the product is designed and do not cover products which have been modified or repaired without GDS Corp approval or which have been subject t
24. an 2 Sensor Temperature 31012 4 NA 16 bit integer ranging from 1 to 4095 scaled for 55 to 125 degrees C Memory Floating Point Note Returned as 15bit plus sign 2s complement with 5 over under range applied Consider over under range when scaling values to be displayed at the workstation The following equation may be used to determine a value for display Display Value MODBUS Value Span Value Zero Value 1 1 Zero Value Span Value Zero Value 05 32767 FP Value Chan 1 33001 4 NA FP Value Chan 2 33002 4 NA Memory ASCII Strings User Info Chan 1 40401 40408 3 NA User Info Chan 2 40409 40416 3 NA 16 ASCII characters 2 per register assigned to the unit identifier read as bytes Chan 1 ASCII Reading 40417 40419 3 NA Chan 2 ASCII Reading 40420 40422 3 NA 6 ASCII characters 2 per register reflecting the display readout EUNITS Chan 1 40423 40427 3 NA EUNITS Chan 2 40428 40432 3 NA 34 Echt i TRANSMAX Gas Monitor Instruction Manual 10 ASCII characters 2 per register assigned to the engineering units read as bytes Byte Variables Preamp Gain Ch1 Preamp Gain Ch2 2 bytes representing Pre Amp HiByte and PGA LoByte settings Firmware Version Version Memory Reals 40433 40434 40435 40436 4 ASCII characters 2 per register reflecting the firmware version 3 3 3 NA NA NA Revision 1 0 Note Real value represents float value without the decimal point such as 123 4
25. ar pattern for reliable operation The end of line unit should have J1 installed in the A position to enable the terminating resistor All others should have J1 in the B position Front panel Rx Tx LEDs are helpful troubleshooting 15 LS E tools RS 485 A ModBus B Master DCS PLC PC RC Systems ST 71 Controller TRANSMAX Gas Monitor Instruction Manual RS485 2 Wire Network 10 0234 ModBus 10 0234 ModBus 10 0234 ModBus Alarm Relay Alarm Relay Alarm Relay Option Board Option Board Option Board Address 1 Address 2 Address 3 FIGURE 4 TRANSMAX II Alarm MODBUS Board 4 7 TRANSMAX II Isolated 4 20mA Output Board Output Signal Wiring The optional 10 0250 isolated 4 20mA Output Board provides dual 4 20mA outputs that are electrically isolated from sensor inputs and the 24 VDC power source Each 4 20mA output share the same common terminal and are not isolated from each other This board is installed behind the Display Assembly in the same location as the Relay MODBUS board Addition of this option is only available on the TRANSMAX II Isolated 4 20mA Output Option Assy 10 0250 Iso 4 20mA Out Revision 1 0 A GDS eeee Address 4 thru n Notes 1 Use Modbus setup menu to set each RTU to have a unique RTU address J1 A installs the terminating resistor amp J1 B omits Install TR only at end of line RTU TB2 1 connects to TB2 4
26. ation Flashing LED indicators provide direct visual confirmation of hazardous conditions Standard features include a real time clock event log prompted calibration procedure and more For combustible or CO applications the dual channel capable TRANSMAX II Gas Monitor offers a standard backlit display optional local alarm relays and an RS 485 Modbus interface or a pair of isolated 4 20mA outputs The TRANSMAX II is capable of simultaneously monitoring a toxic sensor Ch1 and a bridge type sensor Ch2 or two 4 20mA inputs Dual channel units output two independent 4 20mA signals current source Non volatile memory retains all configuration data during power interruptions and the calibration procedure can be easily performed by one person without opening the enclosure Three separate alarm levels are available for each channel these can be user configurable for alarm above or alarm below 1 2 TRANSMAX EC Two Wire Gas Monitor In situations where low power electrochemical sensors for toxic or oxygen deficiency can be used the loop powered TRANSMAX EC is most appropriate All power needed for operation is extracted from the current loop only two wires are needed and wire size may be smaller The TRANSMAX EC Display Assembly consumes less than 2 5 mA of quiescent current CAUTION It is important to understand that the receiver or controller device must supply the loop power for 2 wire operation Be sure the receiver to
27. be used supports this type of operation 1 3 TRANSMAX II Three Wire Gas Monitor The TRANSMAX II Gas Monitor is a single or dual channel externally powered gas monitor for all toxic oxygen depletion combustible CO applications Certain options including a back lit display local alarm relays and MODBUS interface are only available on the TRANSMAX II Gas Monitor If the 10 0233 I O Power Supply board is installed the unit is a TRANSMAX II Gas Monitor TRANSMAX Gas Monitor Instruction Manual SAB one Revision 1 0 1 4 RK XK ON S 1 5 TRANSMAX Features amp Benefits Single or dual channel monitor for commercial and non hazardous applications No potentiometer or jumper setting changes are ever required All setup is done with menus accessed via the LCD magnetic keypad operator interface without opening the enclosure Field adjustable alarm levels may be alarm on high alarm on low fault fail safe latching and acknowledgeable New alarms cause front panel LED s to flash TM EC and become steady after acknowledge TM II Prompted CALIBRATION MODE advises when to apply gas during calibrations Thirty minute trend screen shows rate of change of gas exposures Sensor life bar graph updates after each SPAN calibration Modular design affords efficient installation and setup TRANSMAX Available Sensors The following sensors are generally available for the TRANSMAX family of gas monitors For more information
28. ches To access the Configuration Menu during normal operation activate the EDIT key while in any display mode Use the UP and DOWN keys to select a specific item to edit the entry activate the EDIT key and then use the UP or DOWN keys to modify the entry value To save the changes and return to the previous menu activate the NEXT key CAUTION The presence of a high intensity magnetic field may affect the operation of the TRANSMAX magnetic switches 5 1 Display Modes NEXT key The TRANSMAX graphic display can be configured to show single channel or dual channel values or trend information To select a different display mode select the NEXT key Each swipe will cycle the display between Engineering Units and Trend display Dual Channel Split Screen Engrg Units Bar Graph Engrg Units 30 Minute Trend Dual Sensor Mode Only Oc WW ALM RST WW ALM RST WW UP WINZEN NEXT UP ami ALM2 FAIL NEXT UP ami ALM2 FAIL NEXT 16 LEL NEXT key toggles readout Figure 6 Display Modes 5 2 Alarm Indication TRANSMAX gas monitors have front panel LED indicators for Alarm 1 Alarm 2 and Alarm 3 Fault Alarm levels can be set to any value within the assigned range and can be configured for ALARM ABOVE or ALARM BELOW The alarms can be LATCHED or non latching and the On Delay and Off Delay values can be programmed via the System Configuration menu 18 TRANSMAX Gas Monitor Instruction Manual SAB one
29. e 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 5 6 Relay Configuration The optional relay PCB must be installed to access this menu or a HARDWARE NOT PRESENT message appears K1 K2 Failsafe set for YES means the relay de energizes during alarm and energizes with no alarm This is useful for also signaling alarm when TRANSMAX GAS MONITOR power is lost K3 is a FAULT alarm and is always failsafe K2 Acknowledge set for YES means the UP RESET key RESET key during either data display will set K2 to the normal state EVEN when an Alarm 2 condition exists This is useful for silencing an audible device driven from K2 during the alarm condition K2 Refresh set for ON causes an acknowledged Alarm 2 condition to reactivate K2 if it continues beyond the designated Refresh interval This feature insures against forgotten alarms after an Acknowledge 5 7 Sensor Information Sensor Information has the SENSOR SETUP INFO menus shown in Figure 10 24 4 Gps TRANSMAX Gas Monitor Instruction Manual Revision 1 0 ee i IHSTALL HEW SEHSOFR Historical CAL data Will be Deleted EDIT to Accert HEST to Abort IHSTALL HEN SEHSOR EDIT to install Hew Sensor SENSOR SETTINGS IHFO 7 pr BD Tnstall Sensor 3 Recall Cal History H Input Tyre SMA
30. from GDS Corp toxic oxygen sensors Echem channel and bridge style signals from GDS Corp COs infrared and catalytic bead sensors Also accepts 4 20mA input from three wire remote sensors Single or dual 4 20mA current source three wire Optional dual isolated 4 20mA output available Optional three form C relay MODBUS output 2 5 Environmental Specifications Operating Temperature Range 20 C to 50 C Typical Operating Range Operating Humidity Range 5 to 99 Relative Humidity non condensing Flammability UL 94 5V UL 746 C 5 UV Resistance UL 508 10 Echt i i CDS TRANSMAX Gas Monitor Instruction Manual Revision 1 0 3 0 General Operation 3 1 Electrochemical Sensors Electrochemical sensors consist of electrodes separated by a thin layer of electrolyte with an opening to allow gas to enter Gas diffusing into the sensor is either oxidized or reduced at the sensing electrode and generates a positive or negative electrical current proportional to the concentration of target gas present Electrochemical sensors are typically used for toxic or oxygen measurement The TRANSMAX EC and TRANSMAX II Channel 1 only electrochemical inputs provide the signal conditioning circuitry necessary to process and measure this extremely low level input current 3 2 Bridge Type Sensors Cat bead sensors consist of a matched pair of reference and analytical ceramic beads The analytical bead is a tiny wire coil embedded wi
31. is returned as 1234 Decimal devisor is returned as 1 10 100 or 1000 for decimal position of 1 2 3 or 4 where 123 4 would return the value 10 Chan 1 Cal Zero Real Chan 1 Cal Zero Devisor Chan 1 Cal Span Real Chan 1 Cal Span Devisor Chan 1 Zero Real Chan 1 Zero Devisor Chan 1 Span Real Chan 1 Span Devisor Chan 1 Fault Real Chan 1 Fault Devisor Chan 1 Alarm 1 Real Chan 1 Alarm 1 Devisor Chan 1 Alarm 2 Real Chan 1 Alarm 2 Devisor Chan 1 Alarm 3 Real Chan 1 Alarm 3 Devisor Chan 1 Manual Gain Real Chan 1 Manual Gain Devisor Chan 1 Manual Offset Real Chan 1 Manual Offset Devisor Chan 2 Cal Zero Real Chan 2 Cal Zero Devisor Chan 2 Cal Span Real Chan 2 Cal Span Devisor Chan 2 Zero Real Chan 2 Zero Devisor Chan 2 Span Real Chan 2 Span Devisor Chan 2 Fault Real Chan 2 Fault Devisor Chan 2 Alarm 1 Real Chan 2 Alarm 1 Devisor Chan 2 Alarm 2 Real Chan 2 Alarm 2 Devisor Chan 2 Alarm 3 Real Chan 2 Alarm 3 Devisor Chan 2 Manual Gain Real Chan 2 Manual Gain Devisor 41001 41002 41003 41004 41005 41006 41007 41008 41009 41010 41011 41012 41013 41014 41015 41016 41017 41018 41019 41020 41021 41022 41023 41024 41025 41026 41027 41028 41029 41030 41031 41032 41033 41034 41035 41036 41037 41038 35 ZS PS SS SS SS SS ZS PS PPS SS SS SP TRANSMAX Gas Monitor Instruction Manual Fr eS Revision 1 0 Chan 2 Manual Offset Real 41039 4 NA Chan 2 Manual Offset Devisor 41040 4 NA
32. nd Photoionization PID sensors require values above 2 0VDC In all cases if the sensor is mounted remotely the setting at the TRANSMAX may have to be adjusted higher to compensate for the voltage drop in the sensor cable For more information see the Quickstart guide or sensor manual Set Balance allows balancing of the bridge style sensor and must only be performed with ZERO gas on the sensor Balance is similar to a very coarse ZERO calibration and does not need to be precise since subsequent calibrations will correct for small errors ZERO gas applied to the sensor should provide a Reading of 3 to 3 on the SENSOR BALANCE menu Set Gain to UNITY allows resetting previous calibration OFFSET to zero and GAIN to one This is the definition of UNITY A calibration should be performed after setting UNITY PREAMP GAIN Depending upon Input Type TRANSMAX inputs range from a few micro amps to several hundreds of micro amps Preamp Gain Set is the adjustment that matches the input signal range to the TRANSMAX input signal conditioning circuits Altering the Preamp Gain setting automatically resets previous calibration OFFSET amp GAIN values to UNITY as described in section 6 3 29 TRANSMAX Gas Monitor Instruction Manual Revision 1 0 TECHHICAL PAGE 1 EDIT GENSOR BALANCE cn BS set Balance AN Le Set Sensor Voltage y Reading 3 Set Gain to UNITY Counts 436 RA Ne Gain Set k MS Input Tare gt gt
33. nd may be the desired zero calibration point Other upscale values 31 TRANSMAX Gas Monitor Instruction Manual SAB one Revision 1 0 may also be used for the zero calibration point by setting this menu item to the desired engineering unit value Do not exceed 25 of full scale Raw Min Max Counts menus determine the range of 10 bit analog to digital A D converter counts that define 0 amp 100 of full scale Raw Min A D counts create 0 readings and Raw Max A D counts create 100 readings These menus are very useful in application with non standard input ranges For example if instead of a standard 4 20mA input 8 18mA must be accepted by the TRANSMAX Set RAW MIN COUNTS to match the 8mA input counts value and RAW MAX COUNTS to match the 18mA input counts value The corresponding Zero 0 and Span 100 readings are entered in the Configuration Menu describe in section 5 3 Live A D count values may be viewed from the CAL MODE Information screen described section 4 1 Input Marker menus are available only with special 4 20mA input configuration and when the Input Type menu setting is 4 20mMA TRANSMAX II configuration Since FAULT alarms are also tripped in the lt 4mA region it is important to understand that the Marker events override the FAULT alarm Some monitors or sensor transmitters indicate special modes of operation such as Calibration Mode or Maintenance Mode by transmitting a special less than 4mA marker value The TRAN
34. nnnnnnnnnnnnnnnnnnnnnnnnnnn nnmnnn nnmnnn nnna 7 1 2 TRANSMAX EC Two Wire Gas MOnitor cccccscccssssseeceesseeseesseescenseeseesseeesones 7 1 3 TRANSMAX Il Three Wire Gas Monitor cccccccscsseeesseeeeeseeeeesseeeeeesseenensnseeeeessenes 7 1 4 TRANSMAX Features amp Benefits scccscsccscscssccececssscaiienecccecccessevserevesescarticucdaccsseavertoecedss 8 1 5 TRANSMAX Available Sensors ccssssesecceeeeeeeeeeeseesseeeeeeeseseneeeeeeeeesesseeenonoesnanes 8 ZO SPECIEI UON S scsannaracsseuvaxeesayecanecaneessananvaceeevsisesanseaneraceesssennenes one 9 2 1 EL ET EE E dd ONS arip a a 9 2 2 Mechanical Specifications cccccccsssssseeeeeccesssseseeeeeeeeceesssseeeeeseeooensnseeeesseoessnseeenes 9 2 3 Electrical Specifications TRANSMAX EC cccsssseeseeseeseesseeseenseeseeeneeeseanees 10 2 4 Electrical Specifications TRANSMAX Il ccccesessseeeenseesceeseeseeeneeeeeenseesenees 10 2 5 Environmental Specifications sacs isisccicccsssessnesancnvscuanassvensnensaussacsawecemanssuansecneodenswineens 10 30 G n ral HEEN 11 3 1 Eiere Herborn 11 3 2 BAIR EE NET 11 39 mms IT lu Bue E 11 4 0 Installation amp Initial Setup cecceecessseeeseeeneeeeeeseneeeneeeees 12 A0 Unpacking amp S Te BEE 12 4 2 Location Considerations sssssssssssnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn nnmnnn nnmnnn 12 4 3 Meuptg ZeErentatt t ebessen nnn nnnnn nnen 12 AA
35. nonlinear signals to be linearized by entering the correct curve into the TRANSMAX memory If Linearize is set for NO the CURVE POINTS menu data is not used and no linearization is applied If set to YES the CURVE POINT entries are used and a straight line approximation is calculated between each of the 9 entries 0 input always provides 0 output and 100 input always provides 100 output To prevent accidental data entry a special keystroke sequence of 4 consecutive UP keys are required to enter this menu Backup Configuration allows users to store the entire current TRANSMAX menu database into non volatile memory for restoration later if incorrect values are accidentally entered or uploaded Restore Configuration restores the TRANSMAX GAS MONITOR menu database to the values from the most recent Backup Config The special keystroke sequence of 4 consecutive UP keys is also required to perform backup and restore operations 22 K GDS TRANSMAX Gas Monitor Instruction Manual orp GP cor Revision 1 0 TX Sensor Life set for YES causes the TRANSMAX gas monitor 4 20mA output to transmit a sensor life value after a successful calibration during the CAL PURGE delay During normal operation the TRANSMAX transmits 4mA during the CAL PURGE delay When TX Sensor Life YES the TRANSMAX 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 5mA equal to 100 senso
36. not operate The 4 20mA source current signal from the electrochemical sensor channel if enabled is available at TB2 2 and the 4 20mA signal from the bridge style sensor channel if enabled is available at TB2 3 NOTE The distance 4 20 mA signals can travel is dependent upon several factors including the cable gauge and DC power supply voltage level Ground Wiring It is highly recommended that the TRANSMAX EC electronics be grounded to a low impedance earth ground Connect a ground wire to the base plate located behind the TRANSMAX EC display board CAUTION Applying 24VDC to either 4 20mA output terminal may damage the TRANSMAX lt circuitry o TP1 TB2 3 LEL TB2 TBI qs x ST 48 I O Power Supply CATBEAD x rcu a Assy 10 0233 C S TB2 3 wire xmtr Soule 6 r og Se 1 2 3 4 GE Simple catalytic id S2 ead sensor input GND OUT 4 20 s Ribbon to Display Assy Sensor excitation volts source output 5 REF amp ACT TB2 2 Toxic O2 SES i V _ oo 1 S1 Smart catalytic bead sensor input only C8 C7 b ee O O FIGURE 2 TRANSMAX II I O Power Supply Board 14 TRANSMAX Gas Monitor Instruction Manual Revision 1 0 4 6 TRANSMAX II Alarm MODBUS Board The optional 10 0234 Alarm Relay RS 485 Modbus board supplies two ALARM relays a common FAULT relay and an RS 485 Modbus RTU slave port This board is designed to connect to the back of the Display Assembl
37. o neglect accident improper installation or application or on which the original identification marks have been removed or altered Except for the express warranty written above GDS Corp disclaims all warranties with regard to products sold including all implied warranties of merchantability or fitness IMPORTANT SAFETY INFORMATION Users should have a detailed understanding of TRANSMAX Gas Monitor operating and maintenance instructions Use the TRANSMAX Gas Monitor 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 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 Do not paint the sensor assembly or transmitter e Do not use the TRANSMAX Gas Monitor if its enclosure is damaged or cracked or has missing components e Make sure the cover internal PCB s and field wiring are securely in place before operation e Use only a replacement sensor assembly compatible with the TRANSMAX Gas Monitor and approved by GDS Corp 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 Do not expose the TRANSMAX Gas Monitor to electrical shock or continuous
38. on WARNING Users of these menus must have a detailed understanding of their functions While editing these functions in some cases monitoring of target gases processing of alarms 4 20mA output values and Modbus RS 485 communications are disabled GDS Corp recommends that the user back up the current configuration prior to altering any TECHNICIAN ONLY menus in case Resiore is required later 6 2 Transmitter Selection Menu The TRANSMAX XMITTER CONFIG menu is used to activate channels precisely calibrate 4 20mA outputs and set the real time clock time and date To access this menu press and hold the NEXT key for 5 seconds until the screen appears requesting a special key sequence 4 UP keystrokes Ge i S SMITTER CONFIG nter Key Sesuence BS 02 TOXIC OH gra Lo access Menu paces LEL CURRENT OH NEXT KEY ae RR UP KEY Outeut Zero A 5 SECONDS HEST key to Exit 4 TIMES Quteut Sean E See Manual HELP EE EE EE i Figure 11 Transmitter Configuration Menu Single Dual Gas Monitor Configuration A TRANSMAX EC is a single channel 2 wire 4 20mA device that supports one electrochemical sensor Addition of the 10 0233 Power Supply board converts a TRANSMAX EC into a TRANSMAX II by adding a power supply catalytic bead sensor input signal conditioning and dual 4 20mA output circuitry If both the O2 TOXIC and LEL CURRENT menu items are ON the TRANSMAX II gas monitor will function with both sensor inputs active and both 4
39. or for gases not shown please contact GDS Corp 10 11 12 13 14 15 16 17 18 19 20 5X 6x 9x Oxygen 21 Ozone Carbon Monoxide 22 Ethylene Oxide Chlorine 23 Arsine Chlorine Dioxide 24 Silane Hydrogen 25 Fluorine Hydrogen Sulfide 26 Phosgene Hydrogen Cyanide 27 Hydrazine Hydrogen Chloride 28 Nitric Oxide Hydrogen Fluoride 29 Nitrogen Dioxide Sulfur Dioxide 30 Mercaptane TBM Ammonia NH3 31 Tetrahydorthiophene SmartIR Infrared Combustible and CO sensors Photoionization Detectors for Volatile Organic Compounds Catalytic Bead Combustible sensors TRANSMAX Gas Monitor Instruction Manual Revision 1 0 2 0 Specifications 2 1 General Specifications Sensor Type Sensor Life Range Display Accuracy Configuration Std Output Electrochemical cell bridge type sensor or 4 20mA input Varies by sensor and environmental conditions sensors are guaranteed for one year in ambient monitoring applications Varies by sensor display capable of displaying 0 9999 with floating decimal point Graphic LCD 240 x 128 pixel shows value in engineering units prompted calibration highly detailed setup menu technicians only menu for advanced features Typically 3 FS lt 50 of range 5 FS gt 50 of range 35 C Non volatile solid state memory retains configuration values in the event of power outages TRANSMAX EC Two wire loop powered current sink TRANSMAX II Single or dual channel 4 20mA current
40. oximately one half of the full scale value The regulators used in GDS Corp calibration kit automatically provide the required flow rate After the reading is stable press the EDIT key to perform a SPAN calibration If the SPAN calibration is successful the display flashes REMOVE CAL GAS and starts the CAL PURGE delay CAL MODE will be complete after the end of the CAL PURGE delay Calibration events are time stamped and logged and may be viewed in the Sensor Information menu 20 Echt i e TRANSMAX Gas Monitor Instruction Manual DP Sarp Revision 1 0 5 4 System Configuration Menu EDIT Key All TRANSMAX gas monitor configuration variables are stored in a non volatile database Many menu items contain default values that may be modified to better match a user s particular application Pressing EDIT from either data display enters the LEL or EC SETUP PAGE 1 menu LEL IMPUT 1 TC SYSTEM COWFIG FG 1 SYSTEM COWFIG PG 2 A PRESS POEME Pees B Sustem Config P heasurement Name t6 up Readout Deadband E nees Enter Key Sequence Leven Alarm Settings Eunits NNNNNNNNNN 319 DOWN Track Hegative HO EDIT Lo
41. r life The output then returns to 4mA for the remainder of the CAL PURGE delay For example if after a calibration sensor life is 75 the TRANSMAX GAS MONITOR 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 The GDS Corp C1 Controller is capable of this function 4mA for 10 seconds after Cal Exit Then 4 5mA for 5 seconds Sensor Life Value 4AmA 0 life 5mA 100 life 4mA Monitoring Monitoring Cal level 1 5mA if 3 wire transmitter Cal level 3 0mA if 2 wire transmitter Calibrating Cal Delay Figure 8 Transmit Sensor Life Timing Diagram 5 5 Alarm Settings Page The Alarm Settings page has the Alarm 1 2 3 Setups Relays and Event Log submenus shown in Figure 5 6 Alarm 1 Alarm 2 and Alarm 3 Fail menus are identical and therefore described only once in this section IMPORTANT Alarm functions and their associated LED s are active without the 10 0234 Relay Modbus option installed Alarm 1 2 3 menus are identical ALARM SETTINGS ALARM x SETUP REL ON CONFIG B Alarm 1 3 Bet Point 28 BK Failsafe HO Alarm 2 3 Se Dead Band T EK Failsafe HO Alarm 3 Fail 3 OW Delay Hs EK Acknowledge HO Felays Config 3 OFF Delay Am KZ Refresh off Alarm Event Log 3 Low Trir HO KS always Failsafe Latching HO EUENT LOG Edt 68712704 B317 Al I
42. splay board via TB2 SIMPLE EC SENSOR Remote electrochemical sensors are not supported Output Signal Wiring The signal output wires connect to the TRANSMAX EC display board via TB1 2 WIRE 4 20mA Output Maximum wiring size is 12 AWG The 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 650 ohms in the 2 wire mode Ground Wiring It is highly recommended that the TRANSMAX EC electronics be grounded to a low impedance earth ground Connect a ground wire to the base plate located behind the TRANSMAX EC display board NOTE Circuitry in the TRANSMAX EC output automatically corrects for polarity so positive and negative are interchangeable CAUTION Applying 24VDC to any Sensor Input terminal may damage the TRANSMAX lt circuitry S4 is ALARM RS485 Options PCB amp firmware upload socket Backside of 10 0232 Display Assembly DISPLAY Assy 10 0232 ALARM MODBUS OPTION S4 law Two Wire 4 20mA sink 2 WIRE S Polarity Protected S1 may also be data port for 4 20mA Use only in 2 Wire mode uploading configuration data Output 781 Toxic Oxygen sensors from portable Educator device Non Polar Not available with LEL See manual for more info EC Only Alarms Modbus option S
43. thin a bead of catalytic material The reference bead is similar except it does not contain catalytic material Both beads operate in a bridge circuit that produces an output if the resistance of the analytical differs from that of the reference The bridge is supplied with a constant voltage that heats the elements to approximately 550 C Combustible gases are oxidized on the detector element producing a signal proportional to the concentration of combustible gas The reference tracks changes in temperature pressure and humidity which affect both elements equally Infrared sensors operate on the principle that hydrocarbon gases absorb specific wavelengths of infrared light Infrared LEL sensors are comprised of an infrared light source light path and detector Two wavelengths of light are compared one that is absorbed by hydrocarbons and one selected as a reference The presence of hydrocarbon molecules reduces the intensity of the measurement beam and indicates the presence of combustible gas The TRANSMAX II Channel 2 only bridge sensor input provides the signal conditioning circuitry necessary to process and measure this extremely low level input current 3 3 Direct 4 20mA Input The TRANSMAX II Gas Monitor can be configured to accept direct 4 20mA input signals through either Channel 1 or Channel 2 These input signals can be sourced from any device that outputs a 4 20mA analog signal either calibrated or non calibrated An excellent
44. to the sensor The indicated value should read between 35 and 65 LEL with 50 LEL gas applied Larger errors may indicate incorrect sensor wiring or defective sensor Remember that this is only a coarse check and precision calibrations are performed in Routine Sensor Calibrations described in the following section 4 1 Section 6 4 describes PREAMP GAIN adjustments that may be required if full scale ranges are changed 6 5 Technicians Only Menu The Technicians Only menu group contains items that are factory configured depending upon the type sensor and input connected to the TRANSMAX In general these settings should not require alteration after installation If configured incorrectly some items will prevent monitoring of target gases For example an incorrect setting for the bridge style sensor excitation voltage could destroy the sensor Access requires a special key sequence of four consecutive UP keystrokes to prevent accidental modification of critical items Set Balance and Set Sensor Voltage These settings are required when the Input Type is set for Catalytic Bead or other bridge style sensors These sensors are factory configured and only require field adjustment if the bridge style sensor is mounted at a distance from the TRANSMAX or if a new sensor is installed Selecting another input type disables these adjustments TRANSMAX gas monitor catalytic bead sensors require 2 0 volts excitation voltage at the sensor SmartIR infrared sensors a
45. uipped with a Real Time Clock amp Calendar Time and Date must be set to correctly match its location They are set at the factory in a 24 hour format but may require adjustment to match the location s time amp date after shipment Follow the procedure in Configuration Using the Magnetic Wand in section 3 3 Warm Up and Cal Purge time delays are also available to prevent unwanted alarm trips 25 TRANSMAX Gas Monitor Instruction Manual SAB one Revision 1 0 5 9 LCD Contrast Adjustments LCD Contrast Adjustment may be set for optimum viewing using the menu shown 5 10 HELP Screen The HELP screen contains several pages of information describing how to operate the TRANSMAX GAS MONITOR This is the bottom menu on page 1 of the SETUP screen 5 11 Diagnostics There are two Diagnostics menus useful for simulating output values without exposing the sensor to actual gas The OUTPUT SIMULATION menu allows setting the 4 20mA output to any desired value this is useful for checking responses of devices receiving the TRANSMAX 4 20mA output The ACTIVATE RELAYS menu allows tripping of alarm relays if equipped without tripping alarm set points with the target gas This is useful for testing alarms events such as lights and audible devices IMPORTANT Gas monitoring and alarm processing are not performed while using the Diagnostics features Access requires a special key sequence of four consecutive UP keystrokes 5 12 RS 485 MODBUS SETU
46. we E nie EEE E E E E E EE E E 27 6 2 Transmitter Selection Menu ssssssssnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn nE 27 6 3 Electrochemical Sensor Installation Procedure ssssnnssnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn 28 6 4 Bridge Style Sensor Installation Procedure ccccccceseeeeesseeeeeeeeeeeeseeeeeeeeeneennees 28 6 5 Technicians Only Menu geegent geen 29 APPENDIX 1 MODBUS REGISTERS cccscssseeeseeseeseeeeeees 33 TRANSMAX Gas Monitor Instruction Manual Revision 1 0 1 0 Introduction II TRANSMAX Family Overview The TRANSMAX family of single and dual channel gas monitors is designed to provide continuous monitoring of hazardous gases in the workplace Monitored values are displayed in numerically calibrated engineering units and bar graph format 30 minute trend information is also instantly available The TRANSMAX Gas Monitor can interface to standard GDS Corp electrochemical toxic or oxygen sensors catalytic bead infrared combustible or CO sensors MOS solid state sensors millivolt 0 10 volt or 4 20mA inputs Advanced microcontroller controlled electronics and easy to use LCD operator interface offers superior usability diagnostics and fault analysis For toxic or oxygen deficiency applications the single channel TRANSMAX EC Two Wire Loop Powered Gas Monitor provides a calibrated 4 20 mA current sink signal for connection to control systems or other alarm instrument
47. y board This option is only available for the TRANSMAX II three wire powered unit Relay Wiring The two level alarm relays Relay 1 and Relay 2 and the FAULT relay Relay 3 provide Normally Open Normally Closed and Common wiring contacts as shown CAUTION Alarm relays have dry contacts and power must be supplied from an external source Contacts are rated for RESISTIVE loads Inductive loads such as contactor coils or motors may cause contact arcing which shortens life and emits RFI into the sensor signals Use appropriate arcing snubbers and MOV s across inductive loads and keep wiring away from signal wires External wiring to TB3 Remote Alarm Reset should be shielded and protected from noise spikes to prevent false Alarm Reset events from occurring Remote Alarm Reset OOT O Pt Lew J Assy 10 0234 ST 48 Alarm ModBus Option Relay 1 K1 A Installs RS 485 Terminating Resistor B Omits RS 485 Terminating Resistor Relay 2 K2 TB2 RS 485 A amp B terminals are Relay 3 connected internally for easier K3 IN OUT cabling S is no connect for shield to continue FIGURE 3 TRANSMAX II Alarm MODBUS Board MODBUS Wiring The RS 485 Modbus network should be wired as shown in Figure 2 7 Each TRANSMAX connected represents an RTU and must have a unique RTU address RTU addresses are assigned in the MODBUS setup menu Cabling must be a daisy chain as opposed to a st
48. y exits if no keystrokes are detected after 5 minutes GDS Corp recommended calibration guidelines e Calibration accuracy is only as good as the calibration gas accuracy GDS Corp recommends calibration gases with NIST National Institute of Standards and Technology traceable accuracy to increase the validity of the calibration e Do not use a gas cylinder beyond its expiration date e Calibrate a new sensor before use e Allow the sensor to stabilize before starting calibration approximately 60 minutes e Calibrate on a regular schedule GDS Corp recommends once every 3 months depending on use and sensor exposure to poisons and contaminants e Calibrate only in a clean atmosphere free of background gas 19 TRANSMAX Gas Monitor Instruction Manual Py 4 gt GDS Revision 1 0 Use the following step by step procedure to perform ZERO and SPAN calibrations To enter the CAL MODE activate the DOWN CAL key and within 5 seconds activate the EDIT key Using a calibration cup apply a clean ZERO gas to the sensor or ensure there is no background target gas in the monitored area After the reading has stabilized press the EDIT key to perform a ZERO calibration If the ZERO calibration is successful a message will appear Press the NEXT key to proceed to the SPAN calibration Apply the SPAN gas sample at a rate of 0 5 liters min The SPAN gas value is user programmable see Section 5 4 CAL SPAN VALUE and should be appr

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