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GDS-68XP Operation & Maintenance Manual, Revision 3.5 

 

Page 12 

4

 

OPERATION

 

OVERVIEW

 

The

 

GDS

‐

68XP

 

uses

 

low

 

cost,

 

reliable

 

electrochemical

 

sensors

 

to

 

detect

 

hydrogen

 

sulfide,

 

mercaptan,

 

THT

 

and

 

other

 

trace

 

gases

 

in

 

process

 

streams

 

that

 

contain

 

little

 

or

 

no

 

oxygen.

 

As

 

electrochemical

 

sensors

 

require

 

oxygen

 

to

 

operate,

 

the

 

GDS

‐

68XP

 

alternatively

 

exposes

 

the

 

sensor

 

to

 

the

 

process

 

flow

 

and

 

then

 

purges

 

the

 

sensor

 

with

 

ambient

 

air

 

to

 

maintain

 

the

 

sensor

 

in

 

a

 

sensitive,

 

oxygenated

 

state.

 

 

 

 

 

Figure 4-1: GDS-68XP Flow Diagram (Pressure)  

 

At

 

the

 

beginning

 

of

 

each

 

sequence,

 

the

 

GDS

‐

68XP

 

performs

 

Conditions

 

the

 

Sensor

 

by

 

allowing

 

a

 

small

 

sample

 

of

 

gas

 

to

 

enter

 

the

 

sensor

 

flow

 

cell,

 

followed

 

by

 

a

 

fixed

 

5

 

minute

 

delay.

 

The

 

68XP

 

then

 

enters

 

Sample

 

Charge

 

during

 

which

 

sample

 

gas

 

flows

 

into

 

the

 

sensor

 

flow

 

cell

 

for

 

two

 

minutes,

 

or

 

until

 

sensor

 

output

 

exceeds

 

25%

 

of

 

scale.

  

Once

 

sample

 

pre

‐

charge

 

is

 

complete,

 

the

 

sequencer

 

enters

 

Read

 

mode

 

where

 

the

 

sequencer

 

processor

 

attempts

 

to

 

identify

 

a

 

stable

 

peak

 

value.

 

Once

 

the

 

sample

 

value

 

is

 

Purge

 

Air

 

Pump

 

Flow
Switch

 

Cal

 

Gas

 

Inlet

Sample

 

Inlet

 

Flow

 

Meter

Sample

 

Outlet

 

Sensor

Flow

 

Cell

Run

 

/

 

Cal

Valve

 

3

‐

Way

 

Valve

 

Pressure

 

Regulator

 

Purge

 

Air

 

Inlet

 

Filter

 

RAW

 

SENSOR

  

(Ch

 

1)

 

PPM

 

OUTPUT

(Ch

 

2)

 

Summary of Contents for GDS-68XP

Page 1: ...GDS Corp 1245 Butler Road League City TX 77573 409 927 2980 409 927 4180 Fax www gdscorp com Operation and Maintenance Manual GDS 68XP Process Monitor for Low O2 Applications ...

Page 2: ...TILISÉ 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 3 0 6 5 13 Initial rewrite for version 3 0 Revision 3 1 11 1 13 Update for GASMAX CX Revision 3 2 12 15 13 Update for v2 3 sequencer firmware Revision 3 4 1 30 14 Update for v2 4x sequencer firmware Revision 3 5...

Page 3: ...4 5 INSTALLATION _____________________________________________________ 15 Selecting a Location__________________________________________________________ 15 Power Signal Connections___________________________________________________ 16 On Demand Sequence Input___________________________________________________ 16 Ethernet Connection _________________________________________________________ 16 Relay...

Page 4: ...ration Overview_________________________________________________________ 28 Calibration Procedure CAL PORT SAMPLE _______________________________________ 29 Calibration Procedure INLET PORT SAMPLE _____________________________________ 30 Calibration Procedure STREAM SAMPLE ________________________________________ 31 8 OPERATION and MAINTENANCE_______________________________________ 32 Normal Opera...

Page 5: ...______________ 50 Fault Indication on OUTPUT Channel CH2 _______________________________________ 50 Fault Indication on raw Sensor Channel CH1 ____________________________________ 50 Sensor Fails Calibration_______________________________________________________ 50 GDS 68XP and Receiving Device Displayed Values Don t Match ______________________ 50 Controller MODBUS Data Incorrect ________________...

Page 6: ...AUST TUBING RECOMMENDATIONS 21 FIGURE 5 8 GDS 68XP EXHAUST TUBING 22 FIGURE 6 1 GDS 68XP USER INTERFACE 24 FIGURE 6 2 SEQUENCE TIMING 25 FIGURE 6 3 L1 L2 INDICATOR OPERATION 25 FIGURE 6 4 GDS 68XP GASMAX DISPLAY SEQUENCE 26 FIGURE 7 1 CALIBRATION PROCEDURE CAL PORT 29 FIGURE 7 2 CALIBRATION PROCEDURE INLET PORT 30 FIGURE 7 3 CALIBRATION PROCEDURE SAMPLE STREAM 31 FIGURE 8 1 FAULT CONDITIONS 33 FIG...

Page 7: ...Manual Revision 3 5 Page 7 FIGURE 12 4 GDS 68XP HIGH PRESSURE BYPASS FILTER SPARE PARTS 55 FIGURE 12 5 GDS 68XP SENSOR HEAD EXPLODED VIEW 56 FIGURE 13 1 GDS 68XP DIMENSIONS NEMA 4X ENCLOSURE 57 FIGURE 14 1 GDS 68XP WIRING DIAGRAM 58 ...

Page 8: ... of certain gases in backgrounds that contain low amounts of free oxygen Accuracy in atmospheres containing steam or inert gases cannot be guaranteed Do not paint enclosure transmitter or sensor assembly Do not operate the GDS 68XP 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 Do not ...

Page 9: ... life brushless DC pump for sample and purge air The GDS 68XP features the new dual channel GASMAX CX networked gas monitor In addition to a new high visibility color display the GASMAX CX includes an Ethernet port with built in MODBUS TCP interface and web server for complete integration into user networks GDS Corp software can be used to remotely monitor the status and performance of GDS 68XP sy...

Page 10: ... Ethernet RJ 45 with built in MODBUS TCP interface and web server Optional Relay MODBUS interface with 3x 5A SPDT programmable alarm relays Temperature operating 0 C to 50 C standard no enclosure Note Ambient temperature below 0 C may keep purge air pump from starting 20 C to 50 C with NEMA 4X enclosure and optional 200W AC heater Heater thermostat is set to 50 F and is not user adjustable Tempera...

Page 11: ...oximate 0 On Demand Sequence 1 hour 1 12 15 min 40 min 1 hour 2 12 15 min 105 min 2 hours 3 12 15 min 165 min 3 hours 4 12 15 min 225 min 4 hours 5 12 15 min 285 min 5 hours 6 12 15 min 345 min 6 hours 7 12 15 min 465 min 8 hours Figure 3 2 Sequence Timing RECOMMENDED MINIMUM SAMPLE SEQUENCE TIMES GAS TYPE MINIMUM COMMENTS 15 HYDROGEN SULFIDE LOW RANGE 50 PPM 1 HOUR FOR MAXIMUM SENSOR LIFE USE LON...

Page 12: ...iagram Pressure At the beginning of each sequence the GDS 68XP performs Conditions the Sensor by allowing a small sample of gas to enter the sensor flow cell followed by a fixed 5 minute delay The 68XP then enters Sample Charge during which sample gas flows into the sensor flow cell for two minutes or until sensor output exceeds 25 of scale Once sample pre charge is complete the sequencer enters R...

Page 13: ...nsor to prepare it for the next sequence The length of the Purge Hold time is determined by the SEQUENCE switch setting Figure 4 2 GDS 68XP Sample Timing GDS 68XP Sequence Timing Condition Sensor Fixed Delay Sample Charge Sample Read Sensor Recovery Purge Hold Valve opens sample flows to sensor Purge air applied to sensor Valve opens sample flows to sensor Sequencer finds and stores max gas readin...

Page 14: ...e GDS 68XP supports electrochemical sensors for hydrogen sulfide THT and mercaptan Each sensor contains a fixed amount of chemical electrolyte that reacts with the target gas to create free electrons that are amplified and measured Once the electrolyte is depleted sensor output will diminish and the sensor must be replaced IMPORTANT TOXIC SENSORS ARE SUBJECT TO ACCELERATED DETERIORATION IF POWER I...

Page 15: ...cts or dust may be present be sure that the supplied purge air filter is in place and that a cover is placed over the Cal Gas Inlet port Always mount the GDS 68XP in a vertical position to ensure proper operation of flow switch and filter drains The non metallic enclosure option is strongly recommended if unit is to be installed outside or in areas where high or low temperature extremes may occur ...

Page 16: ...ontroller that the sequence is complete Figure 5 2 GDS 68XP Power and Signal Wiring ETHERNET CONNECTION The GASMAX CX gas monitor includes a standard RJ 45 Ethernet connection on the main I O board Both fixed IP and DHCP based dynamic IP addressing is supported The GASMAX CX supports a full range of MODBUS TCP accessible register see Chapter 10 as well as a built in web server with data display an...

Page 17: ...ELAY CONTACTS ARE RATED FOR RESISTIVE LOADS ONLY INDUCTIVE LOADS MAY CAUSE ARCING WHICH SHORTENS LIFE AND MAY INTERFERE WITH SENSOR DATA MODBUS CONNECTIONS OPTIONAL The dual optional GDS 68XP MODBUS RTU interface allows remote controllers or PLCs to monitor most aspects of operation including real time data range and alarm setpoints and alarm and fault status bits The GDS 68XP interface supports 9...

Page 18: ...stribution may require larger gauge wire since it is critical that the supply voltage for the GDS 68XP at the far end of the string not fall below 22VDC during power up Note that while the GDS 68XP 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 terminals on the GDS 68XP I O Power Supply board This can be d...

Page 19: ... IMPORTANT Keep all electrical fittings tight while circuits are alive PURGE AIR INLET Purge air should be drawn from a source of ambient air that is clean and free of significant levels of hydrogen sulfide or similar toxic gas GDS Corp recommends placing the Purge Air inlet some distance from the GDS 68XP in a location that is free from background gas and protected from heavy rains water spray an...

Page 20: ...ass filter is recommended This filter includes a bypass port and bypass valve that can be opened slightly to enable a continuous flow of sample from the pickup point to the filter input ensuring that fresh sample is always available IMPORTANT WHEN CONFIGURED FOR SAMPLE DRAW THE GDS 68XP SAMPLE PUMP IS CAPABLE OF PULLING UP TO 7 0 PSI VACUUM ENOUGH TO LIFT WATER OVER 15 FEET CARE SHOULD BE TAKEN NO...

Page 21: ... 7 Filter Drain Exhaust Tubing Recommendations NOTE LEAVING THE FILTER DRAIN VALVE CRACKED OPEN WILL ALLOW SAMPLE GAS TO FLOW FROM THE PICKUP POINT TO THE GDS 68XP ON A CONTINUOUS BASIS ENSURING THAT FRESH SAMPLE IS ALWAYS AVAILABLE AT THE BEGINNING OF EACH NEW SAMPLE SEQUENCE Filter Drain Recommendations 1 Including a length of clear tubing in the filter drain line makes it easy to monitor the dr...

Page 22: ...T OUTLET PRESSURE IN THE SAMPLE FLOW CELL MAY DAMAGE THE SENSOR AND WILL RESULT IN INCORRECT READINGS IMPORTANT WHEN INSTALLING THE GDS 68XP OUTDOORS MAKE SURE SAMPLE EXHAUST IS PROTECTED BY A SCREEN OR FILTER TO KEEP INSECTS FROM ENTERING THE EXHAUST PORT AND NESTING IN THE SENSOR FLOW CELL DANGER MAKE SURE EXHAUST GAS IS DIRECTED AWAY FROM PERSONNEL AND EQUIPMENT ESPECIALLY SUMPS OR LOW LYING AR...

Page 23: ...or the DC load and distance Keep DC signal wiring and AC heater wiring separate Make sure sample conditioning is appropriate to the quality of the sample Observe maximum inlet length recommendations Always provide an independent sample exhaust line Make sure that exhaust gas is directed away from personnel and vented to a safe area where exhaust gas can dissipate If mounting the unit outdoors prot...

Page 24: ... for testing and setup is managed by two pushbuttons BYPASS and RUN located on the sequencer board and the state of system sampling purging waiting can be determined by viewing status LEDs L1 and L2 PUMP and VALVE also located on the sequencer board Figure 6 1 GDS 68XP User Interface The GDS 68XP sequencer monitors the output of the GASMAX raw sensor channel and flow switch and controls the operat...

Page 25: ...ew cycle L1 AND L2 indicate the status of the sequencer processor MODE L1 RED L2 GRN PUMP VALVE DESCRIPTION START UP SIMULTANEOUS FLASH OFF OFF FIRST 8 SECONDS ONLY WARM UP ALTERNATE FLASH ON OFF INITIAL WARM UP ONLY 3 ON DEMAND SLOW FLASH OFF ON 2 OFF WAITING FOR REMOTE START ACTIVE SAMPLE SEQUENCE CONDITION 1 FLASH OFF OFF ON 1 ON GAS APPLIED TO SENSOR FOR 10 SEC DELAY 1 FLASH OFF ON OFF PURGE A...

Page 26: ...nd 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 see Chapter 6 Pressing the NEXT key momentarily causes the GDS 68XP display to sequence display screens between DUAL DISPLAY RAW SENSOR TREND PPM OUTPUT TREND RAW SENSOR and PPM...

Page 27: ...RGE AIR FLOW 5 CHECK TIME OF DAY CLOCK FOR TIMEZONE SET HOST NAME AND MEASUREMENT NAME SET ETHERNET NETWORK PARAMETERS CHANGES TO NETWORK SETTINGS ARE NOT RECOGNIZED UNTIL NEXT POWER UP SEQUENCE RETURN TO STEP 3 IF CHANGED 6 OPTIONAL VERIFY 4 20MA SIGNAL TO REMOTE DCS OR PLC USE DIAGNOSTICS MENU TO FORCE CHANNEL 2 OUTPUT TO 4MA 20MA AND VERIFY READING ON RECEIVING DEVICE GDS 68XP COMPLETES FIRST S...

Page 28: ...tion gas is available the Cal Port Sample calibration technique is the fastest and most convenient method If a three way valve is installed in the sample stream inlet the Inlet Port Sample calibration technique is preferred as the calibration gas passes through the filter regulator control valve flow switch and flame arrestors more closely simulating the path taken by the actual sample gas Finally...

Page 29: ...LL APPEAR L2 WILL CHANGE TO SINGLE FLASH PURGE AIR PUMP WILL TURN ON AND AMBIENT ZERO AIR WILL FLOW INTO THE SENSOR FLOW CELL SET THE ZERO VALUE ALLOW THE READING TO STABILIZE AND PRESS THE EDIT KEY TO ACCEPT THE CURRENT READING AS ZERO IF THERE IS A POSSIBILITY THAT TARGET GAS MAY BE PRESENT IN AMBIENT AIR USE A CYLINDER OF ZERO AIR IN PLACE OF PURGE AIR IF ZERO READING IS WITHIN LIMITS THE ZERO ...

Page 30: ...LL CHANGE TO SINGLE FLASH PURGE AIR PUMP WILL TURN ON AND AMBIENT ZERO AIR WILL FLOW INTO THE SENSOR FLOW CELL SET THE ZERO VALUE ALLOW THE READING TO STABILIZE AND PRESS THE EDIT KEY TO ACCEPT THE CURRENT READING AS ZERO IF THERE IS A POSSIBILITY THAT TARGET GAS MAY BE PRESENT IN AMBIENT AIR USE A CYLINDER OF ZERO AIR IN PLACE OF PURGE AIR IF ZERO READING IS WITHIN LIMITS THE ZERO CAL SUCCESS SCR...

Page 31: ...AS SCREEN WILL APPEAR L2 WILL CHANGE TO SINGLE FLASH PURGE AIR PUMP WILL TURN ON AND AMBIENT ZERO AIR WILL FLOW INTO THE SENSOR FLOW CELL SET THE ZERO VALUE ALLOW THE READING TO STABILIZE AND PRESS THE EDIT KEY TO ACCEPT THE CURRENT READING AS ZERO IF THERE IS A POSSIBILITY THAT TARGET GAS MAY BE PRESENT IN AMBIENT AIR USE A CYLINDER OF ZERO AIR IN PLACE OF PURGE AIR IF ZERO READING IS WITHIN LIMI...

Page 32: ...ating conditions Once running the GDS 68XP generates sufficient heat to maintain operation to 0 F ambient However if the unit has been powered off care should be taken during startup to make sure the purge air pump temperature is above 32 F prior to the application of DC power To reduce the possibility of pump damage in extremely cold weather GDS Corp recommends the 200W AC heater be turned on for...

Page 33: ... PEAK ALGORITHM FAULT During the sample sequence the GDS 68XP looks for a level peak value If no level peak is found the GDS 68XP will indicate an algorithm fault SAMPLE OR PURGE AIR FLOW FAULT If the sequencer senses a lack of flow for more than 10 seconds during the sample sequence the GDS 68XP will indicate a flow fault CALIBRATION FAULT If the sensor output higher than 10 of scale or lower tha...

Page 34: ... sample exhaust tube at the flow cell Step 4 Unscrew the sensor flow cell and sensor head cover Step 5 Pull straight down to remove the existing sensor Step 6 Compare the new sensor with the old sensor and verify identical part numbers Step 7 Install the new sensor by aligning the arrow on the sensor with the arrow on the sensor head and pushing straight up Step 8 Reassemble the sensor head cover ...

Page 35: ...igure 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 Del...

Page 38: ...int 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 c...

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 timeou...

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 De...

Page 41: ...ck 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 inpu...

Page 42: ...mp 31011 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...

Page 43: ...ng 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 33028...

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: ... 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 Vo...

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: ... 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 32...

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: ... of scale indicates SENSOR FAULT from GASMAX monitor FAULT INDICATION ON RAW SENSOR CHANNEL CH1 Fault or Overrange on power up Certain toxic sensors indicate off scale low or high at power up and quickly drift towards zero This is normal behavior Continuous Fault indication Remove sensor and examine for moisture or discoloration Replace sensor if wet or discolored Fault indication generally indica...

Page 51: ... 4000 which corresponds to 20 mA Verify that the GDS 68XP MODBUS address matches the address programmed into the controller s channel 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 data from register 310...

Page 52: ...isplay 10 0387 I O Board 10 0390 Optional Relays MB 10 0388 Filter 2000 0136 Filter Element 2000 0137 Sequencer Assembly 20 0142 Sequencer processor PCB sample draw 20 0143 Sequencer actuators PCB sample draw includes pump flow switch and 3 way valve sample draw 1200 0034 Flame Arrestors 3 1200 0056 Flow Meter Sequencer Actuators 1200 0234 Sample Pump 1200 0047 Flow Switch 1200 0034 3 way valve ...

Page 53: ...lter 2000 0147 Filter Element 2000 0137 Sequencer Assembly 20 0057 Sequencer processor PCB 20 0058 Sequencer actuators PCB includes pump flow switch and 3 way valve 1200 0034 Flame Arrestors 3 1200 0037 Run Cal Valve 1200 0056 Flow Meter Sequencer Actuators 1200 0234 Sample Pump 1200 0047 Flow Switch 1200 0034 3 way valve Display 10 0387 I O Board 10 0390 Optional Relays MB 10 0388 ...

Page 54: ...lter 2000 0147 Filter Element 2000 0137 Sequencer Assembly 20 0057 Sequencer processor PCB 20 0058 Sequencer actuators PCB includes pump flow switch and 3 way valve 1200 0034 Flame Arrestors 3 1200 0037 Run Cal Valve 1200 0056 Flow Meter Sequencer Actuators 1200 0234 Sample Pump 1200 0047 Flow Switch 1200 0034 3 way valve Display 10 0387 I O Board 10 0390 Optional Relays MB 10 0388 ...

Page 55: ...er 1200 0167 Filter Element 1200 0449 Sequencer Assembly 20 0057 Sequencer processor PCB 20 0058 Sequencer actuators PCB includes pump flow switch and 3 way valve 1200 0034 Flame Arrestors 3 1200 0037 Run Cal Valve 1200 0056 Flow Meter Sequencer Actuators 1200 0234 Sample Pump 1200 0047 Flow Switch 1200 0034 3 way valve Display 10 0387 I O Board 10 0390 Optional Relays MB 10 0388 ...

Page 56: ...peration Maintenance Manual Revision 3 5 Page 56 Figure 12 5 GDS 68XP Sensor Head Exploded View Sensor Head Assembly 10 0247 Sensor 10 98XX RYYYY See page 11 for list of sensors Sensor Head Base Sensor Head Cover ...

Page 57: ...GDS 68XP Operation Maintenance Manual Revision 3 5 Page 57 13 DRAWINGS AND DIMENSIONS Figure 13 1 GDS 68XP Dimensions NEMA 4X Enclosure 25 6 10 4 25 6 ...

Page 58: ...igure 14 1 GDS 68XP Wiring Diagram 14 Pin Ribbon Cable 24VDC B to GASMAX 4 20 In A from GASMAX CH1 Out C from GASMAX CH2 Out GND Electrical SENSOR HEAD 14 Pin Ribbon Cable GASMAX DISPLAY Backside GASMAX I O BOARD SEQUENCER PCB PUMP VALVE PCB 24VDC Ch1 Out Ch2 Out Common Ch 2 mA In ...

Page 59: ...gs as necessary Menu Setting Value Comment or Customer Setting Alarm Outputs Menu OK Relay 1 Alarm 1 Ch2 Alarm 2 Off Alarm 3 Off Fault Off Acknowledge No Failsafe No Override None Relay 2 Alarm 1 Off Alarm 2 Ch2 Alarm 3 Off Fault Off Acknowledge No Failsafe No Override None Relay 3 Alarm 1 Off Alarm 2 Off Alarm 3 Ch2 Fault Off Acknowledge No Failsafe No Override None Channel Settings Menu OK Chann...

Page 60: ... 3 Enabled NO No alarms from channel 1 Setpoint 50 0 Latching No Trip On High On Delay 0 Off Delay 0 Deadband 1 Fault Alarm Setpoint 10 of scale Fault alarm always enabled Data From Sensor Type EC Sensor Min Raw 800 Max Raw 4000 Filter Samples 60 Polarity POS PGA Gain Sensor Specific GAIN determined by sensor Heater Enabled No Heat degC 10 00 Local Cal Yes Temp Comp 40 Gain Offset 1 00 0 00 30 Gai...

Page 61: ... Tag Name Raw Sensor Eunits mg m3 Zero 0 Span 50 Decimal Points 0 Channel On Yes Deadband 1 In Cal mA 1 5 mA Backup Restore N A Calibrate Offset Sensor Specific Calculated by calibration procedure Gain Sensor Specific Calculated by calibration procedure Cal Zero 0 0 Cal Span App Specific Set to match calibration gas Channel 2 Alarm 1 Setpoint 20 of scale Latching No Trip On High On Delay 0 Off Del...

Page 62: ...r Type AI 4 20mA IO Range 0 20mA Min Raw 800 Set at factory do not adjust Max Raw 4000 Set at factory do not adjust Filter Samples 5 Local Cal No Marker Enabled No Marker 15 63 Marker As IN CAL Sensor Life No Temp Comp 40 Gain Offset 1 00 0 00 30 Gain Offset 1 00 0 00 20 Gain Offset 1 00 0 00 10 Gain Offset 1 00 0 00 0 Gain Offset 1 00 0 00 10 Gain Offset 1 00 0 00 20 Gain Offset 1 00 0 00 30 Gain...

Page 63: ...n Cal mA 3 0 Comm Settings Menu OK Comm 1 Type MB Slave Programmed by user Baud Rate 9600 Parity None Timeout 500 Poll Delay 250 Byte Order BADC Enable LEDs No Comm 2 Type MB Slave Programmed by user Baud Rate 9600 Parity None Timeout 500 Poll Delay 250 Byte Order BADC Enable LEDs No MODBUS TCP Slave Programmed by user Byte Order BADC Master Timeout 500 Poll Delay 250 Enable LEDs Yes ...

Page 64: ...A Security Menu OK Lock Code Factory default MB Web Code 1234 Contact Info Default System Menu OK Version 1 0 Configure System name GDS68XP Programmed by user Date Date Set today s date Time Time Set current time Warmup m 1 Cal Purge m 1 Block Negative No Send Sensor Life No Alarm Refresh 0 Digital Input Mode Alarm Reset Event Log Clear event log View Sensor Life N A ...

Page 65: ...e Time Approximate 0 000 1 On Demand Sequence 30 min 12 001 1 1 5 min 5 min 5 7 min 22 010 1 1 5 min 10 min 15 min 3 011 1 1 5 min 20 min 30 min 43 100 1 1 5 min 50 min 1 hour 5 101 1 1 5 min 110 min 2 hours 6 110 1 1 5 min 230 min 4 hours 7 111 1 1 5 min 350 min 6 hours NOTE 1 DIP SWITCH 4 IS USED FOR FACTORY SETUP AND SHOULD ALWAYS BE LEFT ON NOTE 2 SEQUENCE 1 2 ARE FOR TEST PURPOSES AND SHOULD ...

Page 66: ...low and cause a reboot This is indicated by a 1 minute indication of 0 on the output channel Fixed in version 1 02 SEQUENCER Version 2 41 If the RUN button is pressed while the sequencer is in On Demand wait mode no sequence will occur Fixed in version V2 42 If the RUN button is pressed while the sequencer is set to On Demand mode and the RUN button is pressed during purge hold mode no sequence wi...

Page 67: ...GDS 68XP Operation Maintenance Manual Revision 3 5 Page 67 This page intentionally left blank ...

Page 68: ...GDS Corp 1245 Butler Road League City TX 77573 409 927 2980 409 927 4180 Fax www gdscorp com ...

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