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Operation and Maintenance Manual

1. Ch2TempComp 10 43319 3 N A 32bitFP Gain 32 bit FP Offset Ch 2 Temp Comp420 43323 3 N A 32 bit FPGain 32bitFPOffset Ch2TempComp 30 4327 3 N A 32bitFP Gain 32 bit FP Offset Ch2TempComp 40 4231 3 N A 32 bit FPGain 32 bit FP Offset Ch2TempComp 50 43335 3 N A 32 bit FPGain 32 bit FP Offset Ch2 Temp Comp 60 43359 3 N A 32bitFP Gain 32 bit FP Offset 80 80 800 0 4000 Full Scale Ch 2 Sensor Temp 45021 22 MODBUS 32 bit floating point Page 42 GDS 58NXP Operation 8 Maintenance Manual Revision 1 0 Sample Pump Assembly 1200 0234 Sample Pump GDS 58NXP Display 1200 0047 Flow Switch 1200 0034 Flame Arrestors 2 10 0388 Relay MB Yellow Enclosure 10 0160 2x Power Supply PCB 0 Power Supply PCB 10 0390 1200 0037 RITI ZM ig MI Run Cal Valve ol TET MELI MAI ll Sensor Head Assembly 10 0247 Toxic or Bridge 1200 0056 Flow Meter 1 Flow Cell 10 0205 Figure 12 1 GDS 58NXP Assembly with Toxic Bridge Sensor Spare Parts Page 43 GDS 58NXP Operation Maintenance Manual Revision 1 0 Sensor Head Assembly 10 0247 Sensor Head Base Sensor 10 98xx Toxic Bridge Sensor Head Cover Figure 12 2 GDS 58NXP Standard Sensor Head Exp
2. ChiCalmASeting 43145 3 N A Modbus 32 bit IEEE 754 Floating Pt Ch 1LocalCal 43147 3 N A False NO True VES ChiARange 4348 3 NA TB Ch2Alarmilath 43201 3 N A False NO True YES Ch2AlarmiTip 43200 3 N A False HIGH True LOW Ch2Alarm1OnDelay_ 43203 3 N A Activation delayin seconds Ch 2Alarm 1 Off Delay 43204 3 N A Deactivation delay in minutes Ch 2 Alarm 1 Hysteresis 43205 3 N A Percentofscale Ch2Alarm2lath 43211 3 N A False NO True YES Ch2Alarm2Tip 43212 3 N A False HIGH TruezLoWw Ch 2Alarm 2 On Delay 43213 3 N A Activationdelayinseconds Ch 2Alarm 2 Off Delay 43214 3 N A Deactivation delay in minutes Ch 2Alarm 2 Hysteresis 43215 3 N A Percentofscale 0000000 Ch Alarm 2 Color 43216 3 N A TBD Ch 2Alarm 318000 4321 3 N A False NO True YES Ch2Alarm3Tip 4322 3 N A False HIGH True LOW Ch 2Alarm 3 On Delay 43223 3 N A Activation delayin seconds Ch 2Alarm 3 Off Delay 43224 3 N A Deactivation delay in minutes Ch 2 Alarm 3 Hysteresis 4325 3 N A Percentofscale Ch2Alarm3Coor 425 3 N A TBD Ch 2Alarm 3 Enabled 43227 3 N A False NOTrue YES 2 2
3. ChiDataFrom 43031 3 N A Selection ChiMinRaw 4302 3 N A Binay 800 ChiMaxRaw 4303 3 N A JBimay 400 ChiRemoelD 43034 3 N A Binary Chilntefae 84065 3 N A Binary ChiByeOrder 4306 3 Byteorder 1 5 43037 3 N A Binary 32bit2x O Ch1IP Address 43039 3 N A Binary 4xunsigned bytes ChiPot 43041 3 N A 8080 32062 Ch 1 Remote Sensor 43043 3 N A Binary ChiDP Y 4309 3 N A Numberofdecimalpoints 1 Ch Enable 43080 3 N A False NO True VES ChiDeadband 43081 3 N A Modbus 32 bit IEEE 754FloatingPt_ Ch 1 Marker Enable 42083 3 N A False NO True YES Ch 1 Marker Percent 43084 3 N A Modbus32bitlEEE754 Floating Pt Ch 1 Marker Info 43086 3 N A 6ASCilcharactes UY W UY UY CO UY CO UY CO UY CO W C2 CO UY CO UY UY W OW UY UY Uy CO WW 1 W CO UY CO CO CO W UY WW UY CO Page 40 GDS 58NXP Operation Maintenance Manual Revision 1 0 Ch 1 Ma
4. CO CO UY 09 W W OJOJ O CO UY CO CO CO GDS 58NXP Operation Maintenance Manual Revision 1 0 Ww Ch1CalZero 42001 3 N A Modbus 32 bit IEEE 754 Floating Pt 601685088 42003 3 N A Modbus 32 bit IEEE 754 Floating Pt Ch 1 Zero Value 42005 3 N A Modbus 32 bit IEEE 754 Floating Pt Ch 1 Span Value 42007 3 N A Modbus 32 bit IEEE 754 Floating Pt Ch 1 Fault Value 42009 3 N A Modbus 32 bit IEEE 754 Floating Pt Ch1 Alarm 1 Setpoint 42011 3 N A Modbus 32 bit IEEE 754 Floating Pt Ch 1 Alarm 2 Setpoint 42013 3 N A Modbus 32 bit IEEE 754 Floating Pt Ch 1 Alarm 3 Setpoint 42015 3 N A Modbus 32 bit IEEE 754 Floating Pt Ch 1 Manual Gain 42017 3 N A Modbus 32 bit IEEE 754 Floating Pt Ch 1 Manual Offset 42019 3 N A Modbus 32 bit IEEE 754 Floating Pt 602 Cal Zero Vale 42021 3 N A Modbus 32 bit IEEE 754 Floating Pt 602 Cal Span Value 42023 3 N A Modbus 32 bit IEEE 754 Floating Pt Ch 2 Zero Value 42025 3 N A Modbus 32 bit IEEE 754 Floating Pt Ch2 Span Value 42027 3 N A Modbus 32 bit IEEE 754 Floating Pt Ch 2 Fault Value 42009 3 N A Modbus 32 bit IEEE 754 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
5. G Do Gas and Flame Detection Operation and Maintenance Manual GDS 58NXP Sample Draw System GDS Corp 2513 Hwy 646 e Santa Fe Texas 77510 409 927 2980 gt 409 927 4180 Fax e ww gdscorp com GDS 58NXP Operation Maintenance Manual Revision 1 0 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 QUALIFI TUDIER LE MANUE D INSTRUCTIONS EN ENTIER AVANT D UTILISER D ENTRETENIR OU DE R PARER L QUIPEMENT REVISION HISTORY Revision 1 0 May 2014 Initial version Copyright O 2014 GDS Corp All Rights Reserved P N 1200 0869 01 Page 2 GDS 58NXP Operation Maintenance Manual Revision 1 0 1 SAFETY INFORMATION 7 WARNINGS 7 Warranty 7 If You Have Questions 7 2 GDS 58NXP OVERVIEW 8 GDS 58NXP Sensor Technology 8 Sampling Applications 10 3 GDS 58NXP Hardware 11 4 INSTALLATION 13 Selecting a Mounting Location 13 5 Setup and Operation 18 Understanding the USER INTERFACE 18 CHANNEL SETUP 19 Programming Alarm Levels 19 STARTUP 20 6 CALIBRATION 21 7 MAINTENANCE 23 Sensor Replacement toxic and bridge sensors 23 8 TROUBLESHOOTING GUIDELINES 25 9 SPECIFICATIONS 27 10 USER MENUS 30 Alarm OUTPUTS Menu 31 Chann
6. O A 1925 lt 21 A lt lt i 1 1 1 1 Y 1 pot 1 42 5 2 GDS 58NXP Operation 8 Maintenance Manual Revision 1 0 GDS 58NXP Operation Maintenance Manual Revision 1 0 ii Ci 7 6 10 5 Figure 13 6 GDS 58NXP with Optional Clear Coalescing Filter Page 50 TBL GDS 58NXP Operation amp Maintenance Manual Revision 1 0 000000000000 SAMPLE PUMP in FLOW SWITCH ei mail Figure 14 1 GDS 58NXP Wiring Diagram Page 51 GDS 58NXP Operation amp Maintenance Manual Revision 1 0 1 4 Compression 2x 1 0 centers Material 316 Stainless Steel SRC N PE e 4 4 E 4 3 5 dia hole bottom side 250 dia hole bottom side 125 dia hole bottom side 1 3 length 1 3 length 1 3 length AIR FLOW To be Specified 7 6 Figure 15 1 Sample Draw Duct Assembly 0 20 6x 1 125 o AIR FLOW Figure 15 2 Sample Draw Duct Assembly Hole
7. Determines the number of displayed digits to the right of the decimal point Channel On Channel ON or OFF setting An OFF channel will have 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 Calibrate Menu Offset Shows the computed offset value based on the latest calibration Gain Shows the computed gain value based on the latest calibration Cal Zero The value for the zero point calibration Cal Span The value for span calibration typically 50 of full scale Set Unity Gain Clears gain and offset to 1 00 and 0 00 respectively WARNING Set Unity Gain resets calibration data Temp Comp Temp Gain Offset 40 0 30 0 20 0 0 0 0 0 0 0 0 HEEEEBEBEBE Configure Hydrogen Sulfide E Units ppmH2S Zero 0 00 Span 100 0 Decimal Points 0 Channel on Yes Deadband 0 00 Backup Restore gt Calibrate Offset 15023 Gain 1 00 Cal Zero 0 00 Cal Span 100 0 Set Unity Gain gt Figure 10 4 Channel Settings Menu Tree 2 Page 33 GDS 58NXP Operation Maintenance Manual Revision 1 0 The Comm Settings Menu allows the user to configure the Ethernet interface MODBUS TCP slave and two optional RS 485 serial interfaces Comm Settings COMM 1 Settings COMM 2 Settings ModbusTCP Network Settings Troubleshooting Co
8. Flashing 3302 4 N A True ifalarm 3 indicator flashing 611805068 33023 4 N A Trueiffaultactive Ch 1CommError 33024 4 N A Trueifcommerror ChiConfigEror 33025 4 N A Trueifconfigerror Chil OEro 3306 4 N A Trueifinput outputerror Ch1CalFlag 33027 4 N A True ifcalibration in progress _Ch 1 Marker Flag 33028 4 N A Trueifmarkeractive Chilinearize 320029 4 N A True iflinearization table active ChiErmFlashig 33030 4 N A Trueifchannelerror Ch2FlostingPoint 33040 4 N A 32bitlEEE7S4float Ch 2 Value String 33042 4 N A 6 character string zero terminated Ch 2 Temp Float 33045 4 N A Sensortemperature 602 1508606 1 33047 4 N A Trueifalarmiactive _Ch2A1 Flashing 33048 4 N A Trueifalarm 1 indicator flashing Ch2A2Status 330499 4 N A Trueifalarm2active 602 205008 33050 4 N A True ifalarm 2 indicator flashing Ch2A3Status 33051 4 N A 6 039006 Ch2A3Flshing 33052 4 N A True ifalarm 3 indicator flashing Ch 2 Fault Status 33053 4 N A Ch 2 Comm 33054 4 N A Trueifcommerror Ch 2 Config Error 33055 4 N A Trueifconfigerror 6
9. SINGLE CHANNEL DISPLAY SEQUENCE DUAL CHANNEL DISPLAY SEQUENCE GDS 58NXP CALIBRATION SETUP SENSOR REPLACEMENT TOXIC SENSOR CHARACTERISTICS BRIDGE STYLE SENSOR CHARACTERISTICS GDS IR SENSOR CHARACTERISTICS FIGURE 2 1 FIGURE 2 2 FIGURE 2 3 FIGURE 3 1 FIGURE 3 2 FIGURE 3 3 FIGURE 4 1 FIGURE 4 2 FIGURE 4 3 FIGURE 4 4 FIGURE 5 1 FIGURE 5 2 FIGURE 5 3 FIGURE 6 1 FIGURE 7 1 FIGURE 9 1 FIGURE 9 2 FIGURE 9 3 FIGURE 10 1 FIGURE 10 2 FIGURE 10 3 FIGURE 10 4 FIGURE 10 5 FIGURE 10 6 FIGURE 10 7 FIGURE 12 1 FIGURE 12 2 FIGURE 12 3 FIGURE 13 1 FIGURE 13 2 FIGURE 13 3 FIGURE 13 4 FIGURE 13 5 GDS 58NXP Operation Maintenance Manual Revision 1 0 FIGURE 14 1 GDS 58NAP WIRING DIAGRAM sa a ne ee ea id 51 FIGURE 1 SAVI PLE DRAV DUCT ASSE VI ja saco NO aaa a ae o aa 52 FIGURE 15 2 SAMPLE DRAW DUCT ASSEMBLY HOLE MOUNTING PATTERN eene 52 Page 6 GDS 58NXP Operation Maintenance Manual Revision 1 0 Important Read Before Installation Users should have a detailed understanding of GDS 58NXP operating and maintenance instructions Use the GDS 58NXP only as specified in this manual or detection of gases and the resulting protection provided may be impaired Read the following WARNINGS prior to use WARNINGS The GDS 58NXP sample draw system must be installed operated and maintained in accordance with information contained herein Install
10. UP RST NEXT Move cursor UP Switch to NEXT display Acknowledge reset Move back up in menu Alarms Move to NEXT digit EDIT Enter Main Menu Select or edit menu item Confirm CAL Mode entry DN Cal Move cursor DOWN Enter CAL Mode Figure 5 1 GDS 58NXP Display Activating DOWN CAL followed by EDIT while in display mode initiates calibration mode For the balance of this manual the term press will be used to describe activation of any key via the magnetic wand Pressing the NEXT key causes the GDS 58NXP display to sequence through the available display screens NEXT Figure 5 2 Single Channel Display Sequence In single channel systems pressing the NEXT key will cause the display to alternate between the DATA display and TREND display The DATA display screen shows the current value in calibrated engineering Page 18 GDS 58NXP Operation 8 Maintenance Manual Revision 1 0 units See Fig 5 1 A horizontal bargraph tracks the current value and shows the Alarm 1 and Alarm 2 values in graphical form The user programmable Engineering Units Eunits and Measurement Name text strings are shown below the real time reading The TREND screen shows the most recent 30 minute graph as well as the alarm levels NEXT NEXT NEXT NEXT p Figure 5 3 Dual Channel Display Sequence In dual channel systems pressing the NEXT key will cause the display to sequence through five different
11. a FAULT to occur once the ambient gas is no longer present e Always calibrate a new sensor before depending on the device for personnel or equipment safety e Calibrate on a regular schedule GDS Corp recommends a full calibration every 3 months with periodic bump tests on a more frequent basis to ensure that the sensor has not been affected by temperature extremes or the presence of incompatible gases CALIBRATION PROCEDURE Before beginning calibration make sure you have the following items A cylinder of calibration gas fixed flow regulator and a length of flexible tubing A cylinder of zero air may be necessary if the absence of target gas cannot be confirmed in the sample area To calibrate a GDS 58NXP sample draw 1 If using Zero Air set the Run Cal valve to the CAL position pointing to the right and connect the cylinder of zero air to the GDS 58NXP calibration port Turn on the regulator and verify flow on the flow meter Otherwise allow the current sample to continue to flow into the GDS 58NXP 2 Press the NEXT key until the corresponding DATA Display screen is shown 3 Press the DOWN CAL key and within 5 seconds press the EDIT key to enter CAL MODE Page 21 GDS 58NXP Operation Maintenance Manual Revision 1 0 4 Thescreen will display APPLY ZERO Allow a few seconds for the reading to stabilize and press the EDIT key to complete the ZERO calibration A ZERO CAL SUCCESSFUL message should appe
12. cable Daisy chain power distribution may require larger gauge wire since it is critical that the supply voltage for the GDS 58NXP at the far end of the string not fall below 22VDC during power up Figure 4 4 GDS 58NXP with Optional Modbus Wiring Junction Box MBJB Note that while the GDS 58NXP 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 58NXP I O Power Supply board This can be difficult if wire sizes are larger than 18GA For these reasons if MODBUS is required GDS Corp recommends the addition of the MODBUS Wiring Junction Box see Fig 4 4 This option minimizes the need to access wiring inside the GDS 58NXP provides individual wire landing points for incoming and outgoing MODBUS and power wiring and shields and makes it easy to temporarily disconnect the GDS 58NXP power or MODBUS connections without affecting any other MODBUS device Page 17 GDS 58NXP Operation Maintenance Manual Revision 1 0 UNDERSTANDING THE USER INTERFACE Once installed apply power to the GDS 58NXP and verify that the LCD display is active There are four magnetic switches on the face of the GDS 58NXP arranged in a quadrant around the display Starting in the upper right these are labeled NEXT EDIT DN CAL and UP RST To activate or press a magnetic switch swipe the magnet near the switch
13. connector 7 Reinstall the sensor head cover and flow cell by CAREFULLY screwing the cover onto the sensor head IMPORTANT IF THE SENSOR FALLS OUT OF THE SOCKET DURING THIS STEP IT CAN BE DAMAGED USE CAUTION WHEN REINSTALLING THE COVER AND FLOWCELL 8 Apply power and allow the sensor to warm up properly and perform a full calibration Page 23 GDS 58NXP Operation amp Maintenance Manual Revision 1 0 Step 1 If necessary declassify area and disconnect power Step 2 Disconnect the sample inlet tube to the sensor flow cell Step 3 Unscrew the sensor flow cell and sensor head cover Step 4 Pulling straight down remove the existing sensor Step 5 Compare the new sensor with the old sensor and verify identical part numbers Step 6 Install the new sensor by aligning the arrow on the sensor with the arrow on the sensor head and push straight up Step 7 Reassemble the sensor head cover and flow cell and reattach the sample inlet tube Step 8 Apply power allow the sensor to warm up and perform a complete calibration Figure 7 1 Sensor Replacement Page 24 GDS 58NXP Operation Maintenance Manual Revision 1 0 TOXIC SENSOR INDICATES FAULT OR OVERRANGE e Certain toxic sensors indicate off scale low or high at power up and quickly drift towards zero This is normal behavior e Toxic sensors showing constant FAULT If local remove sensor and examine for moisture or discoloration
14. lE 4 Ch2 4 20mA Out 5 6 Figure 4 3 GDS 58NXP with Optional Analog Wiring Junction Box RWJB OPTIONAL MODBUS WIRING JUNCTION BOX MBJB The GDS 58NXP 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 58NXP interface supports RS 485 differential signaling only Access to each MODBUS RS 485 interface is via TB2 on the optional Relay MODBUS board mounted on the back of the GASMAX CX display module See Fig 5 3 Separate input and output terminals for MODBUS A and B signals are available A center terminal to tie incoming and outgoing shield connections is also provided MODBUS system architecture requires that the devices in any MODBUS loop be connected in a daisy chain layout This minimizes signal reflections and improves signal noise margin A MODBUS Termination Jumper installs a load resistor across the MODBUS signal lines and should only be set to A ON at the last device in the string Cable selection for MODBUS systems is important for both signal integrity and power distribution MODBUS RS 485 transmissions use low voltage differential signaling to achieve reasonable data rates Page 16 GDS 58NXP Operation Maintenance Manual Revision 1 0 over very long distances up to 4000 feet without a repeater For MODBUS data signals GDS Corp recommends 20GA to 24GA twisted shielded
15. the operation of the catalyst Catalytic material is used each time the sensor is exposed to combustible gas and as a result the sensor will lose sensitivity over time Infrared sensors use the fact that hydrogen carbon bonds found in all hydrocarbon gases absorb infrared light at certain frequencies The sensor is designed such that the target passes between the source and detector and a reduction in detector output indicates the presence of gas Infrared sensors cannot be poisoned or damaged by chemicals in the target gas and typically have a long life GDS IR sensors carry a5 year warranty on the electronics and a 12 year warranty on the IR source IMPORTANT INFRARED SENSORS CANNOT DETECT COMBUSTIBLE LEVELS OF HYDROGEN GAS Photoionization detectors PID sensors are used to detect volatile organic compounds such as benzene or toluene PID sensors use high energy ultraviolet light to partially ionize complex molecules and measure the resulting free electrons Each VOC has a different ionization potential IP energy level that is measured in electron volts or eV and a given PID sensor will detect all compounds present with IP values that are equal to or lower than the rated eV of the PID sensor lamp PID sensor lamps eventually wear out and can be factory refurbished Page 9 GDS 58NXP Operation amp Maintenance Manual Revision 1 0 SAMPLING APPLICATIONS When sampling from a static area mount the GDS 58NXP as close as
16. 021 0 33056 4 N A Trueifimput outputerror Ch2CalFag 10 33057 4 N A True ifcalibration in progress Ch 2 Marker Flaa 33058 4 N A Trueifmarkeractive Ch2linearze 330589 4 N A Trueiflinearizationtableactive 40001 Write to acknowledge alarm 40010 16 character ASCII text 5 HH HHH LH HIRI B5 Page 38 GDS 58NXP Operation Maintenance Manual Revision 1 0 Comm 2 Function 4000 3 N A MODBUSserialport 2 Comm 2 Baud Rate 40041 3 N A MODBUSserialporti2 1 Comm 2 Parity 40042 3 N A MODBUSserialport2 Comm2SlvelD 40033 3 N A MODBUSserialporti2 Comm 2 Timeout 40044 3 N A MODBUSserialporti2 Comm 2 Poll Delay 40045 3 N A MODBUSsserialport 2 Comm2ByteOrder 40046 3 N A MODBUSsserialport 2 Comm 2 WirelessT O 40047 3 N A MODBUSserialporti2 Comm 2 LED Enable 40048 3 N A MODBUSserialporti2 DHCP Enabled 050 3 N A Ethernet port DHCP or fixed address Host Name 40051 3 N A Ethernet port 16 ASCII characters IP Address 40066 3 N A Ethernet Net Mask 40070 3 N A Ethernet GatewayIP__ 40074 3 N A Ethernet Modbus TCP Byte Order 40080 3 N A MODBUS TCP func
17. 43231 3 N A Selection i O Ch2MinRaw 43232 3 88 Ch 2 Max Raw 4323 3 N A Binary 4000 1 O O Ch2RemotelD 43234 3 NA Binary Ch 2 Interface 4325 3 NA Binary Ch 2 Byte Order 43236 3 N A Byteorder Ch2Alias 43237 3 N A Binary 32bit2x Ch2IP Address 43239 3 N A Binary 4xunsignedbytes Ch2Pot 42 3 NA Binary 32 bit 2x Ch 2 Remote Sensor 4232 3 N A Binary _ Ch 2 DP 43279 3 N A Number of decimal points Ch 2 Enable 43280 3 N A False NO True YES Page 41 W UY UY UY CO WW UY WW UY UY UY CO CO W CO 2 UY 2 UY W 09 UY W W W CO W UY W W W UY CO CO W CO W GDS 58NXP Operation Maintenance Manual Revision 1 0 Ch2TempComp 40 43299 3 N A 32 bit FP Gain 32 bit FP Offset Ch2TempComp 30 42303 3 N A 32 bit FPGain 32 bit FP Offset Ch2TempComp 20 42307 3 N A 32bitFP Gain 32 bit FP Offset Ch 2Temp Comp 10 43311 3 N A 32 bit FPGain 32 bit FP Offset Ch2TempCompo 43315 3 N A 32 bit FPGain 32 bit FP Offset
18. 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 ChiAlarmilath 43001 3 N A False NO True YES 1 ChiAlarmiTrip 43002 3 N A False HIGH True LOW Ch Alarm 1 On Delay 43003 3 N A Activation delayin seconds 601 Alarm 1 Off Delay 43004 3 N A Deactivation delay in minutes Ch1 Alarm 1 Hysteresis 43005 3 N A Percentofscale Ch1Alarm2Latch 43011 3 N A False NO True YES ChiAlarm2Tip 43012 3 N A False HIGH True LOW Ch1Alarm2 On Delay 43013 3 N A Activation delayin seconds 601 Alarm 2 Off Delay 43014 3 N A Deactivation delay in minutes Ch 1 Alarm 2 Hysteresis 43015 3 N A Percentofscae ChiAlarm2Coor 43016 3 NA TBD ChiAlarm3lath 43021 3 N A False NO True YES ChiAlarm3Tip 4302 3 N A False HIGH True LOW Ch1Alarm3OnDelay_ 43023 3 N A Activationdelayinseconds Ch 1Alarm 3 Off Delay 43024 3 N A Deactivation delay in minutes gt Ch 1Alarm 3 Hysteresis 43025 3 N A Percentofscale ChiAlarm3Coor 4306 3 N A TBD Ch 1Alarm 3 Enabled 43027 3 N A False NOTrue YES
19. Mounting Pattern NOTE APPLY GASKET SEAL ON FACE OF PLATE WHEN INSTALLING SAMPLE DRAW DUCT ASSEMBLY Page 52
20. Replace sensor if wet or discolored If remote check sensor cable and junction box for moisture or standing water Remove sensor and examine for moisture or discoloration FAULT indication generally indicates sensor useful life is exhausted e Toxic sensors left unpowered for more than 3 months are subject to accelerated degradation and may demonstrate a permanent loss of sensitivity TOXIC SENSOR WILL NOT CALIBRATE e Sensor reading during zero calibration exceeds upper limit of zero sensor 5 defective and should be replaced e Sensor reading during span calibration too low sensor may be defective and should be replaced BRIDGE SENSOR INDICATES FAULT OR OVERRANGE e Catalytic bead combustible sensors generally indicate off scale high at power up and quickly drift towards zero as they reach operating temperature This is normal behavior e Combustible sensors showing constant FAULT may have drifted below FAULT alarm level Try readjusting SENSOR BALANCE to clear FAULT If unsuccessful replace sensor e Combustibles sensors showing constant OVERRANGE may have defective bead and should be replaced BRIDGE SENSOR WILL NOT CALIBRATE e Sensor reading during zero calibration exceeds limits readjust SENSOR BALANCE to reset zero if possible If not sensor is defective and should be replaced e Sensor reading during span calibration too low sensor may be defective and should be replaced Page 25 GDS 58NXP Operation Mainte
21. al Revision 1 0 Calibration is critically important to ensure correct operation of the GDS 58NXP The built in CAL MODE function is designed to make calibration quick easy and error free a successful ZERO and SPAN calibration requires only four keystrokes During CAL MODE zero and span the sensor output is disconnected and the GDS 58NXP transmits a fixed mA value called the CAL MARKER to notify the receiving device that a calibration is in progress During the following CAL PURGE DELAY time the GDS 58NXP transmits a fixed 4 0 mA signal to prevent external alarms during calibration In the case of Oxygen sensors during CAL PURGE DELAY the output simulates a typical atmospheric reading of 20 8 CAL MODE automatically exits if no keystrokes are detected after 5 minutes Follow these GDS 58NXP calibration guidelines e Calibration accuracy is only as good as the calibration gas accuracy GDS Corp calibration gases are traceable to NIST National Institute of Standards and Technology e Never use calibration gas that has passed its expiration date e Check the SPAN GAS VALUE setting and make sure it matches the calibration gas See Fig 6 2 e Always use a GDS Corp calibration cup that completely surrounds the sensor head e Be sure to use ZERO AIR a mixture of 21 oxygen and 79 nitrogen as a zero reference unless you are certain that no target gas exists in the area Ambient gas may result in an elevated zero condition that will cause
22. ar 5 not already done set the Run Cal value to the CAL position and connect the cylinder of span gas 6 When the APPLY SPAN message appears turn on the regulator and verify flow on the flow meter After the reading is stable approximately 1 2 minutes press the EDIT key to complete the SPAN GAS calibration If the SPAN calibration is successful the display flashes REMOVE CAL GAS and starts the CAL PURGE delay 7 Immediately shut off the regulator and set the Run Cal valve to RUN At the end of the CAL PURGE delay the GDS 58NXP output is re enabled and the unit is fully operational Flexible Tubing Fixed Flow Regulator Cylinder of Calibration Gas or Zero Air Figure 6 1 GDS 58NXP Calibration Setup Page 22 GDS 58NXP Operation Maintenance Manual Revision 1 0 Normal maintenance for the GDS 58NXP involves verification of proper sample flow and periodic calibration using accurate gas standards GDS Corp recommends calibration at least every three months or more often if temperature extremes vibration the presence of incompatible gases or other environmental factors may accelerate the deterioration of the sensor element Calibration should also include inspections for clogged or wet sensor heads cracked or damaged enclosures and water incursion inside conduit or junction boxes The sample pump is sealed and does not have any user serviceable parts The flow switch is sealed and does not have any user ser
23. are not available if the feature is not installed Diagnostics Relays Analog Inputs Analog Outputs LED Test serial Ports ADC Readings 4 4 4 warning Diagnostic mode Alarms will not Be processed FUNCTION AND REQUIRES A DEVICE REBOOT ON EXIT WARNING ENTERING DIAGNOSTICS MODE DISABLED ALARM Edit OK Next Cancel Relays Relays Menu Relay 1 Relay 2 Allows individual relays to be turned on or off under user control Only Relay 3 Fault Relay available if optional Relay Modbus board is installed Ch 1 EC Loc Counts 856 Temp 24 5 degc Analog Inputs Menu Ch 2 4 20mA Counts 0 Current 0 00mA Shows current input readings for channel 1 and channel 2 Analog Outputs Analog Outputs Menu 4 20mA Out 1 Shows the live output values on analog channel 1 and analog channel 2 4 20mA Out2 OmA Also shows the feedback monitor reading for both channels Out1 Fdbk 0 07 Out2 Fdbk 0 06 LED Test Menu LED Test Cycles the external LED Comm Test Comm Test Menu Connect Loopback Performs a loopback test to verify proper operation of the serial Port 1 gt 2 Bad components Only available if optional Relay Modbus board is installed Port 2 gt 1 Bad 420 Outl Fdbk 1 ADC Readings 420 Out2 Fdbk 2 Displays values monitored by internal analog to digital converters Sensor V SensrAmp PSU Figure 10 7 Diagnostics Menu Tree Page 36 GDS 58NXP Operation Mainte
24. at degc 10 0 Data From determines the source of the data for this channel Min Raw Max Raw Set the range of the input A D converter Normally set to 800 min and 4000 max Useful if a sensor s output does not provide a full range signal Filter Samples Number of samples used by the smoothing filter PGA Gain sets the analog amplification level in the smart sensor interface circuit WARNING Changing PGA gain resets calibration data Heater Enabled Determines if the internal sensor heater is ON or OFF Heat degC Heater thermostat setting Figure 10 3 Channel Settings Menu Tree 1 Page 32 GDS 58NXP Operation Maintenance Manual Revision 1 0 Temperature Compensation compensates for changes in sensor output gain and zero value offset as sensor temperature changes Individual values for gain and offset can be entered for eleven points ranging from minus 406 to 60C Gain and offset values are linearly interpolated between points by the internal microprocessor NOTE These values are typically set by the sensor manufacturer and should not be changed Configure Menu Measurement Name User programmable character string to describe the channel Otherwise called tag name E Units User programmable character string that describes the engineering units value Zero Channel zero value typically 0 Span Channel full scale value Max value is 9999 Decimal Points
25. ation in any hazardous area must comply with all applicable restrictions requirements and guidelines for said hazardous areas It is the end user customer s final decision to ensure that the GDS 58NXP is suitable for the intended use The GDS 58NXP is designed and constructed to measure the level of certain gases in ambient air Accuracy in atmospheres containing steam or inert gases cannot be guaranteed Do not paint transmitter or sensor assembly Do not operate the GDS 58NXP 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 expose the GDS 58NXP to electrical shock or continuous severe mechanical shock Protect the GDS 58NXP from dripping liquids and high power sprays 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 in the sample tubing or in the sensor head Periodically test for correct operation of the system s alarm events by exposing the sample extraction point to a calibration gas concentration above the High Alarm set point WARRANTY 605 Corp UPS products carry a 2 year limited repair or replacement warranty on electronics and workmanship and one year warranty on sensors GDS Corp reserves the right to void warranty claims based on evi
26. dence of misuse abuse or misapplication Warranty period starts on date of shipment IF YOU HAVE QUESTIONS GDS Corp 2513 FM 646 Road North Santa Fe Texas 77510 409 927 2980 Office 409 927 4180 Fax info gdscorp com www gdscorp com Page 7 GDS 58NXP Operation Maintenance Manual Revision 1 0 The GDS 58NXP is designed to provide reliable gas detection in locations where the environment is not suitable for the installation of traditional ambient sensors The GDS 58NXP combines a highly reliable brushless DC sample pump low flow detection switch visual flow meter and GASMAX CX gas detector into a single unit that provides 4 20mA analog output Ethernet programmable relays including system FAULT and a MODBUS slave interface The integrated Run Cal switch and GASMAX CX user prompted calibration procedure make normal maintenance quick and easy Flow Switch Sample Inlet Run Cal ca Cal Gas Inlet Power In Signal Out Flow Meter Sample Outlet Figure 2 1 GDS 58NXP Flow Diagram Sample gas enters the unit through the Run Cal valve where it is drawn into the explosion proof enclosure by the pump after passing through the first of two flame arrestors Output from the pump is directed through the low flow switch and exits the explosion proof enclosure through the second flame arrestor where it travels to the flow meter and sensor flow cell and then exits the flow cell at ambient atmospheric p
27. el Settings Menu 32 Comm Settings Menu 34 System Settings Menu 35 Diagnostics Menu 36 11 MODBUS REGISTERS 37 Page 3 GDS 58NXP Operation Maintenance Manual Revision 1 0 43 45 51 52 SPARE PARTS DRAWINGS AND DIMENSIONS WIRING DIAGRAMS SAMPLE DRAW DUCT ASSEMBLY 20 0141 Page 4 12 13 14 15 GDS 58NXP Operation Maintenance Manual Revision 1 0 TABLE OF FIGURES GASMAXOCI OABORRD iR ERE Um I ERE eU her E o I M Er d RELAY MODBUS CONNECTIONS esses nennen nnns GDS 58NXP WITH OPTIONAL ANALOG WIRING JUNCTION BOX RWJB GDS 58NXP WITH OPTIONAL MODBUS WIRING JUNCTION BOX MBJB MAIN MENU TREE ALARM OUTPUTS MENU TREE CHANNEL SETTINGS MENU TREE 1 CHANNEL SETTINGS MENU TREE 2 COMM SETTINGS MENU SYSTEM SETTINGS MENU TREE GDS 58NXP ASSEMBLY WITH TOXIC BRIDGE SENSOR SPARE PARTS GDS 58NXP STANDARD SENSOR HEAD EXPLODED VIEW GDS 58NXP ASSEMBLY WITH GDS IR SPARE PARTS GDS 58NXP DIMENSIONS ALUMINUM ENCLOSURE GDS 58NXP DIMENSIONS STAINLESS STEEL ENCLOSURE GDS 58NXP 17 X 15 MOUNTING PLATE DIMENSIONS GDS 58NXP 21 X 17 MOUNTING PLATE DIMENSIONS GDS 58NXP 21 X 17 MOUNTING PLATE DUAL SENSOR Page 5 GDS 58NXP FLOW DIAGRAM GDS 58NXP AMBIENT AIR SAMPLING GDS 58NXP AIR DUCT SAMPLING GDS 58NXP WITH SINGLE SENSOR GDS 58NXP WITH DUAL SENSORS GDS 58NXP WITH GDS IR SENSOR GDS 58NXP DISPLAY
28. evel alarm relays a FAULT relay and dual RS 485 Modbus RTU serial ports Flow Switch Input 3 Modbus Wiring Modbus A Modbus B Shield Tie Point Modbus A Modbus B Relay Wiring Fault 1 NC Fault 1 Common Fault 1 NO Relay 3 NC Relay 3 Common Relay 3 NO Relay 2 NC Relay 2 Common Relay 2 NO 10 Relay 1 NC 11 Relay 1 Common 12 Relay 1 NO 1 2 3 4 5 6 7 8 9 000000000000 Figure 4 2 RELAY MODBUS Connections Relays K1 K2 and K3 can be programmed to respond to Alarm 1 Alarm 2 or Alarm 3 as well as fault and other channel or system level operations Alarms can be programmed to trigger above or below a certain value work as normal or failsafe and can be made to latch if desired Relay K4 indicates a FAULT condition in the sensor microprocessor or flow system WARNING RELAY CONTACTS ARE RATED FOR RESISTIVE LOADS ONLY INDUCTIVE LOADS MAY CAUSE ARCING WHICH SHORTENS LIFE AND MAY INTERFERE WITH SENSOR DATA Page 15 GDS 58NXP Operation Maintenance Manual Revision 1 0 OPTIONAL ANALOG WIRING JUNCTION BOX RWJB When interconnect wiring sizes are larger than 20 gauge the GDS 58NXP can be fitted with an external analog wiring junction box This junction box simplifies field wiring and provides auxiliary power and ground terminals for convenience when adding local strobe lights or horns ae 6 Common Aux Common r4 Analog Wiring 1 24V Input 8 2 24V Aux mi 3 Ch14 20mA Out
29. h See GASMAX CX manual Alm Refresh m 0 calibration sequencer Enables remote devices to track In Cal status Digital Input Menu EE Mode Determines action if digital input fault ack input is activated Digital Input Mode Flt Override Normally If Normally OPEN the action will occur if the contacts close if Normally Open Channel ch 1 amp 2 normally CLOSED the event will occur if the contacts open Channel Determines which channel output is affected Hh mm Ch Event 01 25 2013 03 35 2 Fault Out 03 34 2 Fault Tn Event Log Format The event log includes the date time and list of events 03 33 2 Fault Out 03 32 2 Fault In that occur Events include cold boot system boot alarm reset remote Event Log alarm reset log cleared config edit A1 A2 and A3 in and out fault in and out calibration in and out calibration fail communications error config error and marker event ch 1 Sensr Found Clear Event Log Clears all entries in the event log Life 100 Ch 2 No Sensor View Sensor Life Menu Life Computed value based on initial stored gain value when sensor was first calibrated If new gain equals original gain sensor life 100 If new gain equals twice original gain sensor life 0 Figure 10 6 System Settings Menu Tree Page 35 GDS 58NXP Operation Maintenance Manual Revision 1 0 The Diagnostics page provides tools for use during setup or testing Tests for optional features
30. hannel Settings Menu contains settings specific to each channel Channel Settings channel 1 gt These include tag names range calibration settings and alarm levels Channel 2 Comm Settings Menu contains settings specific to the Ethernet Comm Settings network interface MODBUS TCP interface and optional RS 485 serial ports if installed Security Settings Menu allows the user to restrict operation for some or all of the features as well as provide a programmed contact name System Settings Menu contains settings that are unit specific These include unit name time and date warm up and calibration delay settings and Event Log Diagnostics Menu comprehensive set of tools that can be used to activate relays simulate output values and test serial ports Figure 10 1 Main Menu Tree Page 30 comm 1 Settings COMM 2 Settings ModbusTCP Network Settings Troubleshooting Security Code to Lock Modbus web Code 1234 Contact Info System Version v1 00 configure gt Digital Input View Event Log Clear Event Log View Sensor Life Diagnostics Relays Analog Inputs Analog Outputs LED Test serial Ports ADC Readings GDS 58NXP Operation Maintenance Manual Revision 1 0 ALARM OUTPUTS MENU The Alarm Outputs Menu controls the four optional alarm relays if installed These setting include relay programming acknowledge failsafe mode and specific input override options Alarm Output
31. ignal and power connections remove the Recommended Wire Gauge right hand side cover on the GDS 58NXP explosion proof enclosure lt 100 ft 18 GA loosen the 2 thumbscrews holding the display assembly and remove it 100 to 500 ft 16 GA The display will remain connected to the lO Power Supply PCB 500 to 1000 ft 414 GA mounted in the back of the enclosure by a short ribbon cable Route the power and signal wires through the right hand side conduit entry and connect to terminal block TB1 see Fig 4 1 TB1 1 24VDC Input Ethernet Connector RJ 45 TB1 2 Ch 1 4 20mA Out TB1 3 Ch 2 4 20mA Out TB1 4 Power Common Figure 4 1 GASMAX CX I O Board Page 14 GDS 58NXP Operation Maintenance Manual Revision 1 0 NOTE GDS CORP ALWAYS RECOMMENDS USING SHIELDED WIRE FOR SIGNAL AND POWER CABLE ETHERNET CONNECTION The GDS 58NXP provides an industry standard 10 100 Mbit RJ 45 Ethernet connection on the main I O board see Fig 4 1 Standard Ethernet connection links can be up to 100 m 300 ft in length The GDS 58NXP Ethernet interface provides both MODBUS TCP access to the internal MODBUS database as well as a built in web server that allows remote monitoring on any Ethernet device that supports a standard web browser RELAY amp MODBUS CONNECTIONS The GASMAX CX Relay dual MODBUS RTU slave interface is connected piggyback to the back of the GASMAX CX Display Assembly and supplies three l
32. l Figure 3 1 shows the basic single channel configuration d a zi o Oo EE Figure 3 1 GDS 58NXP with Single Sensor The GDS 58NXP is also available in a dual channel configuration that supports both toxic and combustible sensors The most common configuration combines sensors for methane and hydrogen sulfide Figure 3 2 shows an example dual channel configuration Figure 3 2 GDS 58NXP with Dual Sensors Page 11 GDS 58NXP Operation amp Maintenance Manual Revision 1 0 The GDS 58NXP also supports the GDS Corp GDS IR high performance infrared sensor for hydrocarbons or carbon dioxide Figure 3 3 shows an example configuration with the GDS IR Configurations that combine a GDS IR with a second toxic sensor are also supported no IM 1 Figure 3 3 GDS 58NXP with GDS IR Sensor Page 12 GDS 58NXP Operation Maintenance Manual Revision 1 0 SELECTING A MOUNTING LOCATION As compared to a fixed point gas detector the GDS 58NXP sample draw system provides a good deal of flexibility when choosing a mounting location Consider the following when considering where to install the GDS 58NXP e Locate the GDS 58NXP where it will be easy to service and calibrate The high visibility LCD color screen may provide a sufficient visual warning of hazardous conditions without the need to install a dedicated strobe e Minimize the length of sample tubing Lengths up to 50 feet wi
33. ll incur no more than 30 seconds of sample delay e Mount the GDS 58NXP at or above the sample point if possible to minimize condensation e Keep the sample pickup point from becoming submerged in liquid The sample pump is capable of drawing water to a height of 15 feet f liquid enters the flame arrestor or sample pump damage will occur e Ifitis necessary to tie the sample outlet back to the sample source make sure there are no obstructions or restrictions Any increase in pressure inside the sensor flow cell will result in reading errors MOUNTING THE GDS 58NXP The GDS 58NXP standard enclosure is a dual aluminum explosion proof enclosure and is available standalone on a 14 5 x 17 painted steel plate or in a 24 x 24 non metallic or stainless steel enclosure The GDS 58NXP must be mounted vertically for the flow switch and flow meter to operate properly INLET TUBING Specifications for the inlet tubing depend on the target gas Long runs of Inlet Delay Calculation sample tubing will cause a significant delay between the appearance of For OD tubing allow 5 gas and the resulting warning Small diameter stainless steel 1 4 OD is seconds delay for every 10 ideal for most gases Flexible tubing or tubing manufactured from Teflon feet of sample line or PTFE may also be used Smaller diameter tubing results in faster response because of the smaller total volume of gas that must be drawn from the sample point Test
34. loded View d D 2558 GDS IR Sensor Assembly GDS IR See Fig 3 3 for List MI 10 0271 Flow Cell for GDS IR Figure 12 3 GDS 58NXP Assembly with GDS IR Spare Parts Page 44 GDS 58NXP Operation amp Maintenance Manual Revision 1 0 Compression 10 5 Y Compression Figure 13 1 GDS 58NXP Dimensions Aluminum Enclosure Page 45 GDS 58NXP Operation Maintenance Manual Revision 1 0 36 45 3 19 ij nizali Y Compression Y Compression Figure 13 2 GDS 58NXP Dimensions Stainless Steel Enclosure Page 46 GDS 58NXP Operation amp Maintenance Manual Revision 1 0 16 88 7 O q D 11 X 111 14 88 V 25 dia 4x 1 1 1 i 5 6 gt gt gt Ji 1 t i 16 25 Figure 13 3 GDS 58NXP 17 x 15 Mounting Plate Dimensions Page 47 GDS 58NXP Operation Maintenance Manual Revision 1 0 i A 50 dia 4x Figure 13 4 GDS 58NXP 21 x 17 Mounting Plate Dimensions Page 48 Page 9 GDS 58NXP 21 17 Mounting Plate Dual Sensor Figure 13 5
35. minals 1 24 and 4 Gnd Verify ribbon cable connected between IO Power Supply board and Display Assembly Page 26 GDS 58NXP Operation Maintenance Manual Revision 1 0 GDS 58NXP Sample Draw System 24VDC 5 at gt 10 watts Toxic or Bridge sensor 24VDC 5 at gt 15 watts GDS IR sensor 64 x128 pixel LCD with engineering units bargraph and 30 minute trend Electrochemical sensors for toxic gases Catalytic bead sensor for combustible gases Photoionization detector sensor for volatile organic compounds GDS IR infrared sensor for combustibles and CO Demonstrated up to 500 feet of OD tubing 5 of full scale typical Single or dual three wire 4 20mA current source outputs with fault and overrange indication Maximum loop resistance is 750 ohms with standard 24VDC supply RJ 45 10 100 Ethernet port with built in web server and Modbus TCP Optional Relay MODBUS interface with 4x 5A SPDT programmable alarm relays and dual channel RS 485 serial MODBUS Low flow warning with screen and 4 20mA output fault indication 0 C to 50 C Operating Note Ambient temperature below 0 C may keep sample pump from starting On board non volatile memory retains all user settings Aluminum housings 2 with epoxy paint standard 316 stainless steel optional Width 15 381 mm Height 10 5 267 mm Depth 5 127 mm Shipping weight 16 pounds 7 25 kg 20 x20 x14 17 wide x 15 tall painted steel or 304
36. mm X Menu both comm port setting menus are identical Type Modbus Slave determines whether the MODBUS port is a master or slave 4 4 4 4 Baud Rate Sets the baud rate for the serial port Options are 9600 19200 38400 57600 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 COMMx Settings Enable LEDs If YES front panel LEDs indicate MODBUS transmission Modbus Slave BaudRate 9600 Parity Slave ID MODBUS TCP Menu Byte Order BADC Enable LEDs Yes Slave Settings Byte Order sets the byte order for words larger than 16 bits Master Settings ModbusTCP Timeout Length of time in mSec that master will wait for a reply before Slave indicating a comm timeout Byte Order BADC Master Timeout ms 0 Enable LEDs if YES front panel LEDs indicate MODBUS TCP transmission Poll Dly ms 250 Enable LEDs Yes Poll Delay Length of time in mSec between sequential read requests Network Settings Menu DHCP Enabled If YES uses a remote DHCP server to establish a network Network Settings DHCP Enabled Yes Hostname Hostname Character string that defines device network name Uni t 44 1000 Ip Address 169 254 100 10 by DHCP server If DHCP disabled is IP address programmed by user Netmask l 254 254 0 0 et mask Network mask value See above address If NO uses fixed address IP Address Network addre
37. nance Manual Revision 1 0 RECEIVING DEVICE 4 20mA AND GDS 58NXP DISPLAYED VALUES DON T MATCH Check that zero and full scale range values match between GDS 58NXP and receiving device controller Use DIAGNOSTICS menu to force GDS 58NXP output to 12mA 1 2 scale and verify appropriate half scale reading on controller Check for high impedance shorts to ground on 4 20mA wiring If 4 20mA output is off scale low or high and cannot be adjusted using DIAGNOSTICS mode IO Power Supply board may be defective and should be replaced CONTROLLER MODBUS DATA INCORRECT Verify that MODBUS master is requesting data from correct registers 31001 for channel 1 and 31002 for channel 2 Verify that controller MIN and MAX count settings are correct MIN counts should be 800 which corresponds to 4mA and MAX counts should be 4000 which corresponds to 20 mA Verify that the GDS 58NXP 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 correct registers 31001 for channel 1 and 31002 for channel 2 Verify that there are no other MODBUS slave devices with identical MODBUS address GDS 58NXP DISPLAY BLANK Verify DC power at IO Power Supply board TB1 ter
38. nance Manual Revision 1 0 The GDS 58NXP features a full complement of user accessible MODBUS registers that can provide a complete snapshot of the gas detector configuration This includes all real time data preset zero span and calibration values and user programmable text AAA Ch 1 Sensor Life 31009 4 N A 16 bit signed integer ranging from 1 to 100 AA wee T where 1 indicates Cal Required Ch 1 Sensor Temp 31011 4 N A 16 bit integer from 1 to 4095 scaled for m oe LA Ch 2 Sensor Temp 31012 4 N A 16 bit integer from 1 to 4095 scaled for Lt lockStats 0 3205 4 NA O 32034 4 N A Digital input status Ch 1 Fixed Point 33001 4 N A Compatible with GASMAX II CH 2 Fixed Point 33002 4 N A Compatible with GASMAX II Ch 1 Floating Point 33010 4 N A 32 bit IEEE 754 float Page 37 IS A gt IS GDS 58NXP Operation Maintenance Manual Revision 1 0 IS Ch 1 Value String 330122 4 N A 6 character string zero terminated Ch 1 Temperature Float 33015 4 N A Sensortemperature 6018150606 33017 4 N A Trueifalarmiactive Ch1A1 Flashing 33018 4 N A Trueifalarm 1 indicator flashing 601 82508606 1 33019 4 N A Trueifalarm2active 6182 Flashing 33020 4 N A True ifalarm 2 indicator flashing Ch1A3Status 1 33021 4 N A 6 039606 60183
39. nsors and written back to any local Smart Sensor if changed in the menu Channel Settings Channel 1 gt Channel 2 i 2 events The fault relay is always dedicated to fault events Both channel setup menus are identical so only one is shown Channel x Alarm 1 Alarm 2 Alarm 3 Fault Alarm Data From Temp Comp Configure Calibrate All three relay outputs are identical and can be set to respond to channel 1 or channel Alarm X menu all three alarm setting menus are identical Set Point is the engineering unit value where the alarm trips It may be negative or positive gt gt gt gt gt gt gt gt Alarm x Setpoint 20 00 Latching 19 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 Fault off On Delay sec 0 Off Delay min 0 Dead Band 6 1 On Off Delay adjusts the time delay between the time when the event occurs and when the alarm is activated Deadband prevents alarm cycling when the value is close to the alarm level Fault Alarm setpoint 10 00 Fault Alarm setpoint is typically set at 10 of full scale Data From Data From Menu EC Sensor Remote Sensor Min Raw Max Raw Filter Samples 20 Polarity POS PGA Gain gt Heater Enabled No He
40. possible to the extraction point Try to keep the unit above the sampling point so that any moisture that condenses inside the tubing flows back to the source GDS Corp recommends the installation of 81200 0387 end of line dust filter at the pickup point if the area contains significant amounts of dust or particulates See Fig 2 2 Ambient Air Space E Hi Customer supplied tubing amp fittings 1200 0387 74 End of line filter Figure 2 2 GDS 58NXP Ambient Air Sampling Sampling inside air conditioning ducts presents several problems for ambient sensors Rapid air flow can damage the sensor access for calibration or maintenance is difficult and non linear gas distribution can result in errors Using a GDS 58NXP with a 420 0141 Duct Sample Kit simplifies installation maintenance and calibration and samples a larger cross section of the duct stream See Fig 2 4 Customer supplied N tubing e p 20 0141 03 Duct Sample Kit Figure 2 3 GDS 58NXP Air Duct Sampling Page 10 GDS 58NXP Operation 8 Maintenance Manual Revision 1 0 The GDS 58NXP consists of two interconnected NEMA 7 explosion proof enclosures that contain the sample pump and flow switch left side and GASMAX CX gas monitor sensor and flow cell right side Gas enters and exits the left side enclosure via explosion proof flame arrestors passes through the flow meter and into the sensor flow cel
41. ressure Electronics in the GDS 58NXP monitor the flow switch sensor and internal circuitry and activate the FAULT relay if the sensor fails if sample flow falls below a preset value or if the internal microprocessor becomes inactive GDS 58NXP SENSOR TECHNOLOGY For toxic gases the GDS 58NXP supports a wide range of electrochemical echem sensors These sensors use chemical reactions to sense the presence of gases such as hydrogen sulfide sulfur dioxide and many others Each sensor contains an amount of chemical electrolyte that reacts with the target gas to Page 8 GDS 58NXP Operation Maintenance Manual Revision 1 0 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 ACCELERATED DETERIORATION IF POWER IS NOT APPLIED WITHIN 3 MONTHS OF SHIPMENT FROM GDS CORP For combustible gases the GDS 58NXP supports both a traditional catalytic bead cat bead sensor and the GDS IR infrared sensor Catalytic bead sensors burn combustible gas using a catalyst that operates at high temperature An increase in temperature indicates the presence of gas Catalytic bead sensors can detect any combustible gas but the fact that the active bead is in direct contact with the gas can result in damage or reduced sensitivity if the gas contains chemicals that deactivate or temporarily inhibit
42. rker Life 4308 3 Binary Ch Filter Count 89060 3 N A Binary Oto6O gt Ch 1 Radio Reg 43091 3 NA Binary 6016060060 6902 3 N A Binary Ch 1Bridge Voltage 43093 3 N A Modbus 32 bit IEEE 754 Floating Pt Ch Balance 4305 3 N A Binary Ch 1 Heater Enable 43096 3 N A False NO True YES 1 1 1 Ch 1 Heater Setpoint 43097 3 N A Modbus 32 bit IEEE 754 Floating Pt ChiTempComp 40 4309 3 N A 32bitFP Gain 32bitFPOffset ChitempComp 30 43105 3 N A 32 bit FPGain 32 bit FP Offset ChiTempComp 20 42 07 3 N A 32 bit FPGain 32 bit FP Offset Ch 1Temp Comp 10 43111 3 N A 32 bit FPGain 32 bit FP Offset Ch1TempComp0 415 3 N A 32 bit FPGain 32 bit FP Offset ChiTempComp 10 43119 3 N A 32 bit FPGain 32bitFPOffset ChitempComp 20 43123 3 N A 32 bit FPGain 32 bit FP Offset ChitempComp 30 43127 3 N A 32bitFP Gain 32 bit FP Offset Ch1TempComp 40_ 43131 3 N A 32 bit FPGain 32 bit FP Offset Ch1TempComp 50 43135 3 N A 32 bit FPGain 32 bit FP Offset Ch 1Temp 60 6 43139 3 N A 32bitFP Gain 32bitFPOffset Chisensortype 43143 3 N A TBD ChiSendSensorlife 42144 3 N A False NO True VES
43. rm relayH3 configuration Relay3A2Votes 40122 3 N A Alarm relay H3 configuration Relay3A3Votes 40123 3 N A Alarmrelay 3 configuration _Relay 3 Fault Votes 40124 3 N A Alarmrelay 3 configuration Relay 3 Override 40125 3 N A Alarm relay H3 configuration Relay3Ack 4027 3 N A Alarm relay H3 configuration Relay 3 Failsafe 40128 3 N A Alarmrelay 3configuration Force Sensor Upload 40141 3 N A Binary o Digital Input Mode 40150 3 N A Alarmackorflowswitchinput Digital Input Type 40 51 3 N A Alarmackorflowswitchinput Digital Input Mode 40152 3 N A AlarmACKorflowswitchinput _Send Sensor Life 40153 3 N A Trueiftransmitsensorlifevalue Contact Info String 40160 3 N A 16 ASCII characters 2 per register Ch 1 Measurement Name 40401 3 N A 16 ASCII characters 2 per register Ch 2 Measurement Name 40409 NES 16 ASCII characters 2 per register ChiEUNTS 0923 3 N A 10 ASCII characters 2 per register Ch2EUNITS 4028 3 N A 10 ASCII characters 2 per register ChiPreampgan 40953 3 N A Contact factory Ch 2 Preamp gain 40434 3 N A Contactfactory gt 0 Page 39 gt WW UY CO W W UY W
44. s 0 100 LEL 4 to 8 hours 0 100 LEL 4 to 8 hours 0 100 LEL 4 to 8 hours 0 100 LEL 4 to 8 hours 0 100 LEL 4 to 8 hours 0 100 LEL 4 to 8 hours 0 100 LEL 4 to 8 hours 126 p Xylene 0 100 LEL 0 C to 55 C 4 to 8 hours 0 50 LEL 0 C to 55 C 4 to 8 hours 0 100 LEL 0 C to 55 C 4 to 8 hours 0 50 LEL 0 C to 55 C 4 to 8 hours 0 100 v v 0 C to 55 C 4 to 8 hours 131 Propane by volume 0 100 v v 0 C to 55 C 4 to 8 hours 0 5 096 v v 0 C to 55 C 4 to 8 hours 0 3 5 v v 0 C to 55 C 4 to 8 hours 132 Carbon Dioxide 133 Carbon Dioxide Figure 9 3 GDS IR Sensor Characteristics Page 29 GDS 58NXP Operation Maintenance Manual Revision 1 0 The GASMAX CX gas monitor used in the GDS 58NXP has a menu driven user interface that allows the operator to review and adjust a wide range of settings In the GDS 58NXP channel 1 of the GASMAX CX measures the raw sensor gas level and channel 2 provides continuous display output and alarming on the stored value retained in the sequencer memory To access the Main Menu activate the EDIT key with a magnetic wand Main Menu Alarm Outputs Channel Settings Comm Settings Security System Diagnostics Alarm Output Menu contains settings that control the four optional A Outputs alarm relays if installed These setting include relay programming on elay lay 2 SLU 3 and off delay failsafe mode and specific input override C
45. s Relay 1 Relay 2 Relay 3 All three relay outputs are identical and can be set to respond to channel 1 or channel 2 events The fault relay is always dedicated to Relay x Alarm 1 Alarm 2 Alarm 3 channels can activate the relay Options are Off Ch1 Ch2 Ch1 and Fault Acknowledge Failsafe Acknowledge Determines if the alarm can be reset by an Acknowledge Override Alarm 1 2 3 and Fault Determines which channel or combination of Ch2 and Ch1 or Ch2 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 the alarm activates or if power is lost Override Allows the relay to be dedicated to a specific channel alarm level or function such as calibration Settings that involve calibration allow the relay to be connected to a cylinder of calibration gas via a solenoid Alarm valve to enable automatic application of calibration gas if the unit is placed Alarm in Cal Mode Alarm Fault Alarm 1 Alarm 2 3 Alarm Fault Ch1 2 Cal Zero Ch1 Cal Span Ch2 Cal Span 1 2 Cal Zero Span Figure 10 2 Alarm Outputs Menu Tree Page 31 GDS 58NXP Operation amp Maintenance Manual Revision 1 0 CHANNEL SETTINGS MENU The Channel Settings Menu allows the user to adjust individual channel or sensor specific features Data in the Channel Settings Menu is uploaded from Smart Se
46. s have shown that it takes approximately 3 5 minutes for a sample to be drawn through 500 feet of 1 4 OD flexible tubing this gives a delay rate of roughly 0 4 seconds per Page 13 GDS 58NXP Operation amp Maintenance Manual Revision 1 0 foot of tubing Larger diameter tubing with higher internal volume will result in a longer delay while smaller tubing may be subject to blockage from condensed water droplets or dirt particles NOTE THE SAMPLE PUMP IS CAPABLE OF PULLING UP TO 7 0 PSI VACUUM ENOUGH TO LIFT WATER OVER 15 FEET CARE SHOULD BE TAKEN NOT TO SUBMERGE THE SAMPLE EXTRACTION POINT IN LIQUID AS THE PUMP WILL QUICKLY FILL THE FLAME ARRESTORS FLOW SWITCH FLOW METER AND SAMPLE FLOW CELL WITH LIQUID SAMPLE EXHAUST Changes in ambient pressure will affect the output from most sensors and allowing the sample to exhaust directly to the atmosphere will minimize these affects Long runs of tubing connected to the sample outlet may increase the backpressure inside the sensor flow cell and cause higher than normal readings Returning a sample to a process stream may be desirable and will work if the process stream is only slightly above ambient lt 5 of water column and has a relatively constant pressure IMPORTANT DO NOT RESTRICT THE SAMPLE EXHAUST OUTLET A BUILDUP OF PRESSURE IN THE SAMPLE FLOW CELL MAY DAMAGE THE SENSOR AND WILL RESULT IN INCORRECT READINGS DC POWER amp SIGNAL CONNECTIONS To access the GDS 58NXP s
47. screens DUAL DISPLAY screen that shows data from both channels then Channel 1 TREND followed by Channel 2 TREND and then Channel 1 DATA and finally Channel 2 DATA At the bottom of the front cover are two LEDs that monitor communications activity Flashing indicates sent or received data These can be programmed to indicate activity on the Ethernet channel and or one or both of the MODBUS serial channels CHANNEL SETUP Channel sensor information is pre programmed and tested at the factory All GDS Corp 10 98xx Smart Sensors carry a database of sensor information that includes zero and span values calibration setpoint calibration gain and offset information and more When a replacement sensor is installed the sensor s calibration constants are automatically uploaded into the GDS 58NXP If a different type of sensor is installed the GDS 58NXP will prompt the user for permission to upload the sensor s complete database NOTE GDS IR SENSORS DO NOT INCLUDE SETUP INFORMATION AND MUST BE PROGRAMMED MANUALLY PROGRAMMING ALARM LEVELS Each channel in the GDS 58NXP offers three independently programmable alarm levels as well as a negative fault level threshold Each alarm can be set to alarm ABOVE or BELOW a given value as well as a Page 19 GDS 58NXP Operation amp Maintenance Manual Revision 1 0 programmed for independent ON DELAY or OFF DELAY times See Chapter 10 User Menus for more information To access the alarm
48. setting menu go to EDIT CHANNEL SETTINGS CHANNEL ALARM PROGRAMMING RELAYS Once channel alarm levels are programmed then each of the four alarm relays can be programmed to activate once a given alarm condition exists Alarm relays are dry contact SPDT and may be configured as normal or FAILSAFE normally open held closed Power must be supplied from an external source and should be fused The normally open common and normally closed contact wiring layout is shown in Figure 4 2 ED STARTUP Apply power to the GDS 58NXP and confirm that the sign on screen appears and that the sample pump is operating Allow the unit to warm up for the recommended interval See Chapter 9 In some cases electrochemical sensors will start off in an overrange high condition and drift down to zero while in others the sensor will start from negative fault and drift up towards zero In either case if the sensor remains in overrange or fault for an extended period of time it may be faulty and would need to be replaced Once the sensor or sensors have stabilized test the low flow warning switch by turning the Run Cal valve approximately half way between Run and Cal or by closing the adjustment valve on the flow meter The display screen should show a FAULT and flash red Open the flow meter valve or set the Run Cal valve to either position and verify that the flow fault disappears Page 20 GDS 58NXP Operation Maintenance Manu
49. ss If DHCP enabled will show address assigned Gateway Network gateway value See above Troubleshooting Troubleshooting Menu view Error Count Clear Error Count View Error Count View a menu that tracks the number of network errors Clear Error Count Resets number of network errors to zero Figure 10 5 Comm Settings Menu Page 34 GDS 58NXP Operation Maintenance Manual Revision 1 0 SYSTEM SETTINGS MENU The Comm Settings Menu allows the user to configure the Ethernet interface MODBUS TCP slave and two optional RS 485 serial interfaces System Configure Menu Version v1 00 Configure M Date amp Time Sets the system date and time Used for display and event Digital Input View Event Log Clear Event Log Warm Up Delay Sets length of time in minutes from power on to output View Sensor Life log entries signals active During Warmup Delay the 4 20mA outputs are set to 4mA Cal Purge Delay Sets length of time in minutes that outputs are disabled following a zero or span calibration Configure Block Negative If YES blocks screen from showing negative values Unit 44 1000 01 25 2013 Send Sensor Life If YES enables transmission of sensor life data across 4 Date Time 04 33 05 20mA output see GASMAX CX manual for more details Warmup m 1 Cal Purge m 1 InCal mA Sets the 4 20mA output value to be transmitted during a Block Neg NO Send SensrLife No InCal mA 0 00 Alarm Refres
50. stainless steel plate 21 wide x 17 tall painted steel or 316 stainless steel plate GASMAX CX monitor CSA Certified Div 1 amp 2 Groups B C D Enclosure CSA certified for use in Class Div 1 areas Flame arrestors UL certified for use in Class 1 Div 1 areas Two years on electronics one year on sensors Page 27 Model Power Input Display Sensor Types Draw Distance Accuracy Standard Output Flow Monitor Temperature Memory Housing Dimensions Approvals Warranty GDS 58NXP Operation Maintenance Manual Revision 1 0 C sensore minnares vacias Tome ange Woman T 33 H2S Low Humidity 0 100 ppm 0 500 ppm 0 C to 50 C 2 to 4 hours Figure 9 1 Toxic Sensor Characteristics 61 PID 10 6 eV low range 0 50 ppm 0 5000 ppm 0 C to 55 C 62 PID 10 6 eV high range 0 100 ppm 0 9999 ppm 0 C to 55 C 64 PID 10 0 eV low range 0 5 ppm 0 50 ppm 0 C to 55 70 Catalytic Bead Methane 0 100 LEL 0 100 LEL 0 C to 55 C 71 Catalytic Bead Other 0 100 LEL 0 100 LEL 0 C to 55 C Figure 9 2 Bridge Style Sensor Characteristics Page 28 GDS 58NXP Operation Maintenance Manual Revision 1 0 0 100 LEL 0 C to 55 C 4 to 8 hours 0 100 LEL 0 C to 55 C 4 to 8 hours 0 100 LEL 0 C to 55 C 4 to 8 hours 0 100 LEL 0 C to 55 C 4 to 8 hours 0 100 LEL 0 C to 55 C 4 to 8 hours 0 100 LEL 0 C to 55 C 4 to 8 hours 0 100 LEL 4 to 8 hour
51. tion Modbus TCP Timeout 40081 3 N A MODBUS TCP timeout mSec Modbus TCP Poll Delay 40082 3 N A MODBUS TCP poll delay mSec Write command to save local config W W UY CO UY CO CO CO UY GW CO C2 CO Save Config 40095 N Config Changed 40096 3 N A True if config changed since last read Security Unlock 40099 3 NA BD Relay 18100066 40101 3 N A Alarmrelay 1configuration Rely1A2Votes 40102 3 N A Alarmrelay 1configuration Relay 1A3Votes 40103 3 N A Alarmrelay 1 configuration RelayiFaultVotes 40104 3 N A Alarmrelay 1 configuration Relay 1 Override 40105 3 N A Alarmrelay 1configuration Reay1Ack 40107 3 N A Alarmrelay 1 configuration Relay 1 Failsafe 40108 3 N A Alarmrelay 1 configuration Relay2AlVotes 40111 3 N A Alarmrelay 2configuration Relay2A2Votes 40112 3 N A Alarmrelay 2configuration Relay 2 A3 Votes 40113 3 N A Alarmrelay 2configuration Relay 2 Fault Votes 40114 3 N A Alarmrelay 2configuration Relay 2 Override 4015 3 N A Alarmrelay 2 configuration Reay2Ack 40117 3 N A Alarmrelay 2configuration Relay 2 Failsafe 40118 3 N A Alarmrelay 2configuration Relay 30100066 40121 3 N A Ala
52. viceable parts In the event that water or other liquid enters the GDS 58NXP the flow meter flow switch and flame arrestors will need to be replaced or cleaned thoroughly The flame arrestors can be cleaned and dried using compressed air or heat The sensor should not require replacement unless the liquid level in the flow cell was excessive due to backpressure or a clogged outlet SENSOR REPLACEMENT TOXIC AND BRIDGE SENSORS If a toxic or bridge sensor shows FAULT does not respond to gas or can no longer be calibrated it should be replaced GDS 58NXP sample draw systems use GDS Corp type 10 98XX toxic or bridge sensors where the XX is the sensor type 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 GDS 58NXP toxic or bridge sensor See Fig 7 1 If necessary declassify the area or remove power to the GDS 58NXP Disconnect the sample inlet tube to the sensor flow cell Unscrew the sensor head cover and flow cell A Remove the old sensor by pulling straight down IMPORTANT DO NOT TRY TO UNSCREW THE SENSOR PULL STRAIGHT DOWN 5 Compare sensor part numbers and make sure the new sensor and old sensor match 6 Carefully install the replacement sensor by aligning the arrow on the sensor with the arrow engraved on the sensor head Push straight up until the sensor connector seats firmly into the sensor

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