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GDS GASMAX CX Operation And Maintenance Manual Download Page 14

GASMAX CX Operation & Maintenance Manual, Revision 1.0 

 

Page 14 

The

 

MODBUS

 

wiring

 

junction

 

box

 

is

 

attached

 

to

 

the

 

GASMAX

 

CX,

 

either

 

on

 

the

 

bottom

 

fitting

 

or

 

one

 

of

 

the

 

side

 

fittings,

 

depending

 

on

 

installation

 

requirements.

 

Specify

 

BOTTOM,

 

LSIDE

 

or

 

RSIDE

 

when

 

ordering

 

(See

 

Fig.

 

4

‐

5).

   

 

 

 

 

Figure 4-5: MODBUS JBOX LOCATION OPTIONS 

 

 

 

“BOTTOM”

 

“LSIDE”

 

Summary of Contents for GASMAX CX

Page 1: ...GDS Corp 1245 Butler Road League City TX 77573 409 927 2980 409 927 4180 Fax ww gdscorp com Operation and Maintenance Manual GASMAX CX Single Dual Channel Gas Monitor ...

Page 2: ... MANUAL COMPLETELY BEFORE OPERATING OR SERVICING ATTENTION POUR DES RAISONS DE SÉCURITÉ CET ÉQUIPEMENT DOIT ÊTRE UTILISÉ ENTRETENU ET RÉPARÉ UNIQUEMENT PAR UN PERSONNEL QUALIFIÉ ÉTUDIER LE MANUE D INSTRUCTIONS EN ENTIER AVANT D UTILISER D ENTRETENIR OU DE RÉPARER L ÉQUIPEMENT REVISION HISTORY Revision 1 0 4 15 14 Initial Release Copyright 2014 GDS Corp All Rights Reserved P N 1200 0872 01 ...

Page 3: ...ional Relay MODBUS Interface ____________________________________________ 12 Optional MODBUS Junction Box________________________________________________ 13 Local Smart Toxic sensor______________________________________________________ 15 Connecting a Remote Toxic Sensor transmitter ___________________________________ 16 Local Smart Bridge Sensor____________________________________________________...

Page 4: ...______________________________ 32 Toxic Sensor Indicates Fault or Overrange________________________________________ 32 Toxic Sensor Will Not Calibrate ________________________________________________ 32 Bridge Sensor Indicates Fault or Overrange_______________________________________ 32 Bridge Sensor Will Not Calibrate _______________________________________________ 32 Receiving Device and GASMAX ...

Page 5: ...u ___________________________________________________________ 41 11 NETWORK INTERFACE _____________________________________________ 42 MODBUS Registers __________________________________________________________ 42 12 SPARE PARTS ____________________________________________________ 50 Sensor Head Accessories______________________________________________________ 51 13 DRAWINGS AND DIMENSIONS _______...

Page 6: ...R 19 FIGURE 4 11 REMOTE GDS IR CONNECTION 20 FIGURE 4 12 REMOTE 4 20MA INPUT 21 FIGURE 5 1 GASMAX CX DISPLAY SCREEN SEQUENCE 22 FIGURE 5 2 GASMAX DATA DISPLAY 23 FIGURE 5 3 GASMAX TREND DISPLAY 23 FIGURE 6 1 CALIBRATION FLOWCHART 28 FIGURE 7 1 GASMAX SENSOR REPLACEMENT 30 FIGURE 10 1 MAIN MENU TREE 35 FIGURE 10 2 ALARM OUTPUTS MENU TREE 36 FIGURE 10 3 CHANNEL SETTINGS MENU TREE 1 37 FIGURE 10 4 CH...

Page 7: ... atmospheres containing steam or inert gases cannot be guaranteed Always mount the sensor head vertically with the sensor head facing down However the GDS IR infrared sensor may be mounted vertically or horizontally Do not paint transmitter or sensor assembly Do not operate the GASMAX CX if its enclosure is damaged or cracked or has missing components Make sure the cover internal PCB s and field w...

Page 8: ...n 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 CX to track calibration and alarm events for later recall on the LCD readout For toxic gases the GASMAX CX supports a wide range of electrochemical echem sensors These sensors use ch...

Page 9: ... to adjust calibrate or troubleshoot the GASMAX CX without declassifying the area Local sensors are contained in a stainless steel sensor head typically attached to the bottom of the GASMAX CX as shown below The normal sensor head includes an integrated stainless steel flame arrestor that must be removed for the detection of certain reactive gases such as chlorine or chlorine dioxide If removed th...

Page 10: ...it poured seals and other installation elements necessary to ensure safety In all cases GDS Corp recommends any GASMAX sensor 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 sensor head Splash Guard p n 10 0205 to protect the sensor from damage For maximum protection agai...

Page 11: ... One 4 20mA output is available on TB1 2 and Channel Two 4 20mA output is available on TB1 3 GDS Corp always recommends using shielded wire for signal and power cable Figure 4 1 GASMAX CX I O Power Signal Wiring CO M 42 0 O U T 2 42 0 O U T 1 PW R R PW R C 42 0 IN 1 A CO M 42 0 IN 2 CH1 CH2 E N E T LO C AL SEN SO R TOD IS P LA Y TB1 1 12 30VDC Input TB1 2 Channel 1 4 20mA Out TB1 3 Channel 2 4 20m...

Page 12: ... two RS 485 Modbus RTU serial ports and access to the Digital Input Remote ACK port Figure 4 3 GASMAX CX Optional Relay MODBUS Interface CO M 42 0 O U T 2 42 0 O U T 1 PW R R PW R C 42 0 IN 1 A CO M 42 0 IN 2 CH1 CH2 E N ET LO C AL SEN SO R TOD IS P LA Y 2 3 4 1 TB1 5 B S A A B TB2 Relay Wiring 1 Fault 1 NC 2 Fault 1 Common 3 Fault 1 NO 4 Relay 3 NC 5 Relay 3 Common 6 Relay 3 NO 7 Relay 2 NC 8 Rel...

Page 13: ... to 24GA twisted shielded cable Daisy chain power distribution may require larger gauge wire since it is critical that the supply voltage for the GASMAX CX at the far end of the string not fall below 12VDC during power up Note that while the GASMAX CX has two sets of wiring terminals for MODBUS A and B signals daisy chain power wiring requires that two wires be installed in the 24 and GND terminal...

Page 14: ...he MODBUS wiring junction box is attached to the GASMAX CX either on the bottom fitting or one of the side fittings depending on installation requirements Specify BOTTOM LSIDE or RSIDE when ordering See Fig 4 5 Figure 4 5 MODBUS JBOX LOCATION OPTIONS BOTTOM LSIDE ...

Page 15: ...wn below Smart sensors are automatically recognized on power up and upload range calibration and production date information to the GASMAX for use during operation and setup Figure 4 6 Local Smart Toxic Sensor Connection IMPORTANT TOXIC SENSORS ARE SUBJECT TO ACCELERATED DETERIORATION IF POWER IS NOT SUPPLIED WITHIN 3 MONTHS OF SHIPMENT FROM GDS CORP CO M 42 0 O U T 2 42 0 O U T 1 PW R R PW R C 42...

Page 16: ... mounted at some distance from the GASMAX CX GDS Corp recommends a maximum distance of 500 ft 150 m using shielded two wire cable sized appropriately Figure 4 7 Remote Toxic Sensor Transmitter Connection NOTE FIELD WIRING FOR REMOTE TOXIC SENSOR TRANSMITTERS IS NOT POLARIZED AND MAY BE CONNECTED IN ANY ORDER IMPORTANT TOXIC SENSORS ARE SUBJECT TO ACCELERATED DETERIORATION IF POWER IS NOT SUPPLIED ...

Page 17: ...or volatile organic compounds are factory installed and must be connected to the CH 1 Smart Sensor connector as shown below Figure 4 8 Local Smart Bridge Sensor Connection NOTE LOCAL SMART BRIDGE SENSORS AUTOMATICALLY ADJUST SENSOR EXCITATION VOLTAGE CO M 42 0 O U T 2 42 0 O U T 1 PW R R PW R C 42 0 IN 1 A CO M 42 0 IN 2 CH1 CH2 E N ET LO CAL SEN SO R TOD IS P LA Y LOCAL SMART BRIDGE TYPE SENSORS ...

Page 18: ...hown below Remote infrared sensor transmitters use industry standard 4 20mA signal levels and can therefore be mounted at some distance from the GASMAX CX GDS Corp recommends a maximum distance of 500 ft 150 m using shielded two wire cable sized appropriately Figure 4 9 Remote Infrared Sensor Transmitter NOTE FIELD WIRING FOR REMOTE INFRARED SENSOR TRANSMITTERS IS POLARIZED AND CORRECT WIRING POLA...

Page 19: ...egrated zero set pushbutton and magnetic zero switch is included inside the GASMAX CX enclosure and is used to periodically set the zero point for the GDS IR Figure 4 10 Local GDS IR Infrared Sensor COM 420 OUT 2 420 OUT 1 PWR R PWR C 420 IN 1 A COM 420 IN 2 CH 1 CH 2 E NET LOCAL SENSOR TO DISPLAY GASMAX CX with LOCAL GDS IR SENSOR GDS IR INTERFACE BOARD MOUNTED INSIDE GASMAX CX ENCLOSURE USE MAGN...

Page 20: ...shield GDS Corp recommends Belden B8771 The cable shield must be connected to an earth ground at ONE END ONLY In this configuration the zero set pushbutton is located in the GDS IR remote mount junction box Figure 4 11 Remote GDS IR Connection TB1 PWR A ZE TB2 CO COM 420 OUT 2 420 OUT 1 PWR R PWR C 420 IN 1 A COM 420 IN 2 CH 1 CH 2 E NET LOCAL SENSOR TO DISPLAY RED 18 30VDC Power BLU 4 20mA Analog...

Page 21: ...nnels support local calibration if necessary if the devices are pre calibrated or are calibrated at the source the calibration feature on each channel can be disabled Figure 4 12 Remote 4 20mA Input CO M 42 0 O U T 2 42 0 O U T 1 PW R R PW R C 42 0 IN 1 A CO M 42 0 IN 2 CH1 CH2 E N ET LO C AL SEN SO R TOD IS P LA Y OUTPUT TB1 1 24VDC Input TB1 2 Channel 1 4 20mA Out TB1 3 Channel 2 4 20mA Out TB1 ...

Page 22: ... USER MENU mode See Chapter 8 During USER MENU mode the UP DN and NEXT keys are used to select and confirm menu entries The USER MENU allows the operator to view the Event Log and channel parameters and change system settings such as alarm levels and real time clock day and date Pressing the DOWN CAL key followed by the EDIT key initiates calibration mode For a detailed description of calibration ...

Page 23: ...color changes to YELLOW and if the channel is in Alarm 2 the background color changes to RED Figure 5 2 GASMAX DATA DISPLAY Below the LCD display two LEDs indicate the status of the Ethernet or serial MODBUS communications channels The TREND display shows a graph of the most recent 30 minute interval for the channel value The graph is scaled to match the channels zero and span settings and shows t...

Page 24: ... to environmental conditions such as ambient temperature humidity and barometric pressure as well as applied reference and counter voltages generated by the GASMAX CX electronics At this point the GASMAX CX can be calibrated and made operational NORMAL OPERATING MODE During normal operation the GASMAX display shows the current gas reading in direct calibrated engineering units If the reading goes ...

Page 25: ...T INSTALLED ALARM SETTINGS AFFECT THE OPERATION OF THE FRONT PANEL DISPLAY ONLY SEPARATE ALARM SETTINGS MAY NEED TO BE PROGRAMMED IN THE 4 20MA RECEIVING DEVICE ALARM OPERATION FAULT FAULT is typically used to indicate FAULT conditions that suggest sensor failure or out of measurement range conditions ...

Page 26: ...inutes Follow these GASMAX CX calibration guidelines 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 Never use calibration gas that has passed its expiration date Check the SPAN GAS VALUE setting and make sure it matches the calibration gas See Fig 6 2 Always use a GDS Corp calibrat...

Page 27: ... chlorine dioxide To calibrate a GASMAX CX detector 1 For dual channel units press the NEXT key until that the DATA Display screen for the desired channel is shown 2 To enter CAL MODE press the DOWN CAL key and within 5 seconds press the EDIT key 3 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 p...

Page 28: ... output is re enabled and the unit is fully operational The flow chart shown in Figure 5 2 illustrates the above procedure UP CAL NEXT 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 DURIN...

Page 29: ...bustible sensors where the XX is the gas type or GDS IR infrared sensors For toxic or combustible sensors the range value should also be specified when ordering replacement sensors For example a replacement H2S sensor for 0 100 ppm would be 10 9815 R0100 To replace a GASMAX local sensor 1 Declassify the area or remove power to the GASMAX CX 2 Unscrew the sensor head cover If unable to open the cov...

Page 30: ...rent 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 cur...

Page 31: ...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 SOCKET DURING THIS STEP IT CAN BE DAMAGED USE CAUTION WHEN REINSTALLING THE COVER 6 At the GASMAX CX activate the Main Menu open the Sensor Information page and select Install New Sensor This will reset the Sensor Life settings and tell the GAS...

Page 32: ...calibration exceeds upper limit of zero sensor is defective and should be replaced Sensor reading during span calibration too low sensor may be defective However it may be possible to temporarily continue operation by increasing PREAMP GAIN BRIDGE SENSOR INDICATES FAULT OR OVERRANGE Catalytic bead combustible sensors generally indicate off scale high at power up and quickly drift towards zero as t...

Page 33: ... configuration CONTROLLER SHOWING MODBUS COMM ERROR Check for incorrect MODBUS polarity swap A and B if unsure no damage will occur Verify that MODBUS master is requesting data from correct MODBUS address Verify that MODBUS master is requesting correct registers 31001 for CH 1 31002 for CH 2 Verify that there are no other MODBUS slave devices with identical MODBUS address GASMAX DISPLAY BLANK Veri...

Page 34: ...e wire 4 20mA current source outputs with fault and overrange indication Maximum loop resistance is 750 ohms with standard 24VDC supply Optional Output Relay MODBUS interface with 4x 5A SPDT programmable alarm relays Dual channel MODBUS interface Temperature Electronics 40 C to 60 C See Sensor Manual for additional details Memory On board non volatile memory retains all user settings Housing Alumi...

Page 35: ...figure Digital Input View Event Log Clear Event Log View Sensor Life Diagnostics Relays Analog Inputs Analog Outputs LED Test Serial Ports ADC Readings Alarm Output Menu contains settings that control the four optional alarm relays if installed These setting include relay programming on and off delay failsafe mode and specific input override Channel Settings Menu contains settings specific to each...

Page 36: ... Alarm 1 2 3 and Fault Determines which channel or combination of channels can activate the relay Options are Off Ch1 Ch2 Ch1 and Ch2 and Ch1 or Ch2 Acknowledge Determines if the alarm can be reset by an Acknowledge command YES or not NO Failsafe Determines if the relay is OFF when inactive NO or ON when inactive YES Failsafe connections thru the Normally Open connection will open automatically if...

Page 37: ... three alarm setting menus are identical Set Point is the engineering unit value where the alarm trips It may be negative or positive Latching YES causes the alarm to remain active even after the event clears NO clears the alarm automatically Trip On HIGH causes the alarm to activate if the value goes above the setpoint Trip On LOW activates the alarm if the value goes below the setpoint On Off De...

Page 38: ...oint Channel On Channel ON or OFF setting An OFF channel will have no effect on any alarm or output value Deadband The value around zero for which the screen will show 0 0 Eliminates display of small values around zero due to sensor drift Temperature Compensation compensates for changes in sensor output gain and zero value offset as sensor temperature changes Individual values for gain and offset ...

Page 39: ... and 115200 baud Slave ID Sets the MODBUS slave ID for the serial port Byte Order sets the byte order for words larger than 16 bits Enable LEDs If YES front panel LEDs indicate MODBUS transmission MODBUS TCP Menu Slave Settings Byte Order sets the byte order for words larger than 16 bits Master Settings Timeout Length of time in mSec that master will wait for a reply before indicating a comm timeo...

Page 40: ... span calibration Block Negative If YES blocks screen from showing negative values Send Sensor Life If YES enables transmission of sensor life data across 4 20mA output see GASMAX CX manual for more details InCal mA Sets the 4 20mA output value to be transmitted during a calibration sequencer Enables remote devices to track In Cal status Alarm Refresh See GASMAX CX manual Digital Input Menu Mode D...

Page 41: ...ack Port 1 2 Bad Port 2 1 Bad 420 Out1 4 60mA Fdbk 1 4 57mA 420 Out2 4 05mA Fdbk 2 4 14mA Sensor V 0 01V SensrAmp 0 78V PSU 22 93V WARNING ENTERING DIAGNOSTICS MODE DISABLED ALARM FUNCTION AND REQUIRES A DEVICE REBOOT ON EXIT Relays Menu Allows individual relays to be turned on or off under user control Only available if optional Relay Modbus board is installed Analog Inputs Menu Shows current inp...

Page 42: ...1 4 N A 16 bit integer from 1 to 4095 scaled for 55 C to 125 C Ch 2 Sensor Temp 31012 4 N A 16 bit integer from 1 to 4095 scaled for 55 C to 125 C Ch 1 4 20mA Out FP 31210 4 N A 32 bit floating point Ch 2 4 20mA Out FP 31212 4 N A 32 bit floating point Ch 1 Output Feedback FP 31214 4 N A 32 bit floating point Ch 2 Output Feedback FP 31216 4 N A 32 bit floating point 12V Input FP 31218 4 N A 32 bit...

Page 43: ...ing Ch 1 A3 Status 33021 4 N A True if alarm 3 active Ch 1 A3 Flashing 33022 4 N A True if alarm 3 indicator flashing Ch 1 Fault Status 33023 4 N A True if fault active Ch 1 Comm Error 33024 4 N A True if comm error Ch 1 Config Error 33025 4 N A True if config error Ch 1 I O Error 33026 4 N A True if input output error Ch 1 Cal Flag 33027 4 N A True if calibration in progress Ch 1 Marker Flag 3302...

Page 44: ...tion 40030 3 N A MODBUS serial port 1 Comm 1 Baud Rate 40031 3 N A MODBUS serial port 1 Comm 1 Parity 40032 3 N A MODBUS serial port 1 Comm 1 Slave ID 40033 3 N A MODBUS serial port 1 Comm 1 Timeout 40034 3 N A MODBUS serial port 1 Comm 1 Poll Delay 40035 3 N A MODBUS serial port 1 Comm 1 Byte Order 40036 3 N A MODBUS serial port 1 Comm 1 Wireless T O 40037 3 N A MODBUS serial port 1 Comm 1 LED En...

Page 45: ...t Votes 40114 3 N A Alarm relay 2 configuration Relay 2 Override 40115 3 N A Alarm relay 2 configuration Relay 2 Ack 40117 3 N A Alarm relay 2 configuration Relay 2 Failsafe 40118 3 N A Alarm relay 2 configuration Relay 3 A1 Votes 40121 3 N A Alarm relay 3 configuration Relay 3 A2 Votes 40122 3 N A Alarm relay 3 configuration Relay 3 A3 Votes 40123 3 N A Alarm relay 3 configuration Relay 3 Fault V...

Page 46: ...54 Floating Pt Ch 2 Alarm 1 Setpoint 42031 3 N A Modbus 32 bit IEEE 754 Floating Pt Ch 2 Alarm 2 Setpoint 42033 3 N A Modbus 32 bit IEEE 754 Floating Pt Ch 2 Alarm 3 Setpoint 42035 3 N A Modbus 32 bit IEEE 754 Floating Pt Ch 2 Manual Gain 42037 3 N A Modbus 32 bit IEEE 754 Floating Pt Ch 2 Manual Offset 42039 3 N A Modbus 32 bit IEEE 754 Floating Pt Ch 1 Alarm 1 Latch 43001 3 N A False NO True YES...

Page 47: ...ridge Voltage 43093 3 N A Modbus 32 bit IEEE 754 Floating Pt Ch 1 Balance 43095 3 N A Binary Ch 1 Heater Enable 43096 3 N A False NO True YES Ch 1 Heater Setpoint 43097 3 N A Modbus 32 bit IEEE 754 Floating Pt Ch 1 Temp Comp 40 43099 3 N A 32 bit FP Gain 32 bit FP Offset Ch 1 Temp Comp 30 43103 3 N A 32 bit FP Gain 32 bit FP Offset Ch 1 Temp Comp 20 43107 3 N A 32 bit FP Gain 32 bit FP Offset Ch 1...

Page 48: ...y in minutes Ch 2 Alarm 3 Hysteresis 43225 3 N A Percent of scale Ch 2 Alarm 3 Color 43226 3 N A TBD Ch 2 Alarm 3 Enabled 43227 3 N A False NO True YES Ch 2 Data From 43231 3 N A Selection Ch 2 Min Raw 43232 3 N A Binary 800 Ch 2 Max Raw 43233 3 N A Binary 4000 Ch 2 Remote ID 43234 3 N A Binary Ch 2 Interface 43235 3 N A Binary Ch 2 Byte Order 43236 3 N A Byte order Ch 2 Alias 43237 3 N A Binary 3...

Page 49: ... FP Offset Ch 2 Sensor Type 43343 3 N A TBD Ch 2 Send Sensor Life 43344 3 N A False NO True YES Ch 2 Cal mA Setting 43345 3 N A Modbus 32 bit IEEE 754 Floating Pt Ch 2 Local Cal 43347 3 N A False NO True YES Ch 2 AI Range 43348 3 N A TBD Registers 45001 45022 added in V1 03 Ch 1 Value 45001 3 N A 800 0 4000 Full Scale Ch 2 Value 45002 3 N A 800 0 4000 Full Scale Ch 1 Value 45003 04 3 N A MODBUS 32...

Page 50: ...upply Board 10 0390 Power I O Board Sensor Head Assembly 10 0247 Toxic or Bridge Direct Type 1 2 10 0247F Toxic Direct Reactive Gas Type 3 4 10 0248 Toxic Sensor Transmitter Type 20 21 10 0248F Toxic S T Reactive Gas Type 22 23 Yellow Enclosure 10 0160 GASMAX Enclosure Display Assembly 10 0387 Display Board 10 0388 Relay MODBUS Board ...

Page 51: ... 12 3 GASMAX Sensor Head Splash Guard Flow Cell Splash Guard Flow Cell Sensor Head Splash Guard 10 0198 Splash Guard Fits all sensor heads Sensor Head Flow Cell 10 0205 Flow Cell 1 8 NPT compression fittings Sensor Head Assembly See list above Sensor 10 98xx Toxic combustible SmartIR PID Sensor Head Base Sensor Head Cover ...

Page 52: ...GASMAX CX Operation Maintenance Manual Revision 1 0 Page 52 13 DRAWINGS AND DIMENSIONS Figure 13 1 GASMAX CX DIMENSIONS 5 0 7 75 5 25 ...

Page 53: ...GASMAX CX Operation Maintenance Manual Revision 1 0 Page 53 Figure 13 2 GASMAX CX REMOTE SENSOR TRANSMITTER DIMENSIONS 5 0 7 75 4 25 ...

Page 54: ...GDS Corp 1245 Butler Road League City TX 77573 409 927 2980 409 927 4180 Fax ww gdscorp com ...

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