Operation & Maintenance Manual

Transcription

1 Operation & Maintenance Manual GDS-58XP Explosion-Proof Sample Draw System for Toxic & Combustible Gases GDS Corporation 2513 Hwy 646 Santa Fe, Texas (409) (409) (Fax)

2 GDS-58XP Sample Draw System Users Manual V2.1 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 SÉCURITÉ, CET ÉQUIPEMENT DOIT ÊTRE UTILISÉ, ENTRETENU ET RÉPARÉ UNIQUEMENT PAR UN PERSONNEL QUALIFIÉ. ÉTUDIER LE MANUE D INSTRUCTIONS EN ENTIER AVANT D UTILISER, D ENTRETENIR OU DE RÉPARER L ÉQUIPEMENT. NOTICE: THIS DOCUMENT CONTAINS LICENSED INFORMATION THAT IS THE INTELLECTUAL PROPERTY OF GDS CORP; ACCORDINGLY, IT IS AVAILABLE ONLY UNDER LICENSE FROM GDS CORP AND MAY NOT BE REPRODUCED, WHOLLY OR IN PART, BY ANY LICENSEE TO ANY OTHER PERSON OR ORGANIZATION WITHOUT THE EXPRESS WRITTEN PERMISSION OF GDS CORP. For further information about GDS Corp, please call (409) or support@gdscorp.com Copyright 2012 GDS Corp. All Rights Reserved P/N Page 2

3 GDS-58XP Users Manual V2.0 CONTENTS 1 GDS-58XP SAMPLE DRAW SYSTEM Description Features GDS-58XP SPECIFICATIONS HARDWARE INSTALLATION Installing the GDS-58XP INITIAL SETUP Flow Setup Adjust Alarm Levels Verify Remote Readings Initial Calibration OPERATION & MAINTENANCE Overview Calibration Sensor Removal / Replacement SPARE PARTS GDS-58XP Spare Parts GASMAX Spare Parts WARRANTY Overview APPENDIX MODBUS Registers...14 Page 3

4 GDS-58XP Sample Draw System Users Manual V Moisture Calculations GASMAX Configuration...15 Page 4

5 GDS-58XP Users Manual V2.0 GDS-58XP SAMPLE DRAW SYSTEM 1.1 Description Thank you for choosing the GDS Corp GDS-58XP Explosion Proof Sample Draw system. The GDS-58XP provides a safe and reliable way to pull toxic or combustible gas samples from a remote location for measurement by a local GASMAX II gas monitor. The GDS-58XP is recommended for use with any hydrocarbon or hydrogen-based combustible gas or any toxic gas, including reactive components such as chlorine, chlorine dioxide or hydrogen fluoride*. The GDS-58XP features a long life brushless DC pump with low-flow warning switch with 5A local relay contacts for Alarm 1, Alarm 2 and Sensor or Flow fault. The GDS-58XP is designed for use in Class I Division 1 hazardous areas. 1.2 Features Designed for Class I Division 1 Hazardous Areas Long life Brushless DC sample pump with fixed 1.3 liters-per-minute flow rate Integrated flow switch connected to local 5A fault relay Local relay contacts for optional light or warning sounder Standard non-isolated 4-20mA current loop output (source) Optional 110 / 220VAC input (requires additional matching XP enclosure) Standard MODBUS slave interface for remote monitoring of signal and flow status High resolution display shows engineering units and trend data Built-in user-prompted calibration Magnetic interface for non-intrusive operation in hazardous areas GDS-58XP for reactive gases not for use in hazardous areas. Page 5

6 GDS-58XP Sample Draw System Users Manual V2.1 1 GDS-58XP SPECIFICATIONS Input Power: +24VDC +/- 10%, 12.5W max. Sensor Type: Any GDS Corp Toxic, Combustible or PID Sensor Analog Output: Single 4-20mA calibrated current loop (source), Relay Output: Dual 5A programmable relays for Alarm 1 and Alarm 2; Single 5A relay contacts for Sensor Fault and/or Low Flow Warning Digital Output: RS-485 Two-wire Serial MODBUS Slave Interface Flow rate: 0.5 to 1.0 liters / minute (adjustable) Maximum sample distance: Approximately 100 ft / 33 m Inlet and Outlet Fittings: ¼ Compression Dimensions: (W) x 10.0 (H) x 6 (D) Weight 11 pounds / 4.9 KG Page 6

7 GDS-58XP Users Manual V2.0 2 HARDWARE INSTALLATION 3.1 Installing the GDS-58XP Install the GDS-58XP in a suitable location within 100 ft / 33 m of the intended sample location. The GDS-58XP features four mounting holes that can be used to securely attach the sample draw system to a bulkhead or wall. Make sure there is sufficient clearance to install the sample inlet tubing and sample outlet tubing (if used). Also make sure that the Run / Cal valve can operate freely and that access to the Cal Port is not blocked for any reason. Pump & Flow Switch GASMAX II Monitor Sample Inlet Run / Cal Valve Cal Port Sensor & Flow Cell Flow Meter Sample Outlet Figure 1 GDS-58XP Note: In order for low flow switch to operate properly, the GDS-58XP must be mounted vertically. Page 7

8 GDS-58XP Sample Draw System Users Manual V2.1 DC Power: Connect a source of +24VDC, +/- 10% power to the power supply wiring terminals (See Fig 2). An external power switch and / or circuit protection device should be provided by the customer s wiring. If the area is considered hazardous then all explosion proof wiring recommendations, guidelines and regulations should be observed. PWR OUT 4-20 ECHEM OUT 4-20 LEL GND C2 C1 GASMAX I/O Power Supply P/N TP1 CATBEAD REF COM ACT +24VDC to TB2 #1 COM to TB2 #4 TB2 C8 C7 S1 TB1 O2/TOXIC: 4-20mA Output on TB2 #2 BRIDGE: 4-20mA Output in TB2 #3 Figure 2 GDS-58XP / GASMAX II Power Supply & Analog Signal Wiring Attach Note: If the optional P/N Class I Div 1 AC Power Supply is attached, connect the incoming AC wiring directly to the power supply Line, Neutral and Ground terminals. Analog Output: Connect the output 4-20mA current loop wiring to the appropriate controller or DCS input. If a TOXIC sensor is used (Oxygen, Hydrogen Sulfide, etc) then the output is taken from TB2, Pin #2. If a combustible or PID sensor is used, the output is taken from TB2, Pin #3. Alarm Relay Output: Alarm 1 ( Relay 1, TB1 Pins 1,2,3) and Alarm 2 ( Relay 2, TB1 Pins 4,5,6) contacts are located on the Relay / MODBUS board, attached to the back of the GASMAX II display (See Fig 3). These relays can be programmed via the main menu to close at preset signal levels, and can operate as either Alarm Above or Alarm Below contacts. Fault Relay Output: Relay 3 (TB1 Pins 7,8,9) is programmed to indicate a FAULT condition under the following circumstances: 1) Excessive negative sensor drift; 2) Sensor removed or 3) Flow switch dropout (low flow). If only a single wiring pair is available, the 4-20mA output can be routed through the FAULT relay. This will cause the current loop signal to be interrupted in the event of a low flow indication. Page 8

9 GDS-58XP Users Manual V2.0 Remote Alarm Reset TB3 P1 Relay 1 (K1) Relay 2 (K2) Relay 3 (K3) NO 1 C 2 NC 3 NO 4 C 5 NC 6 NO 7 C 8 NC 9 TB1 Assy: ST-48 Alarm / ModBus Option K1 K2 K A B S A B U1 J1 TB2 RS-485 A & B terminals are connected internally for easier IN / OUT cabling. S is no connect for shield to continue. A (Installs RS-485 Terminating Resistor) B (Omits RS-485 Terminating Resistor) Figure 3 GDS-58XP / GASMAX II Relay & MODBUS Wiring Attach MODBUS Output: The GASMAX II provides a two-wire RS-485 serial data link via TB2 Pins A & B. See the GASMAX II manual for more information on MODBUS registers and operation. Sample Inlet: Attach a length of tubing to the Sample Inlet using the supplied ¼ compression fitting. Note: If the sample location is excessively wet or dusty, GDS Corp recommends the installation of a coalescing or particulate filter on the intake end of the sample draw tubing. This will keep the particulate or moisture from being drawn into the sample tubing, sample draw pump and sensor. In the event the filter becomes clogged, the FLOW OK indication will be replaced by FAULT on the GASMAX II display and the Low Flow / Fault relay will energize. Sample Outlet: Attach a length of tubing to the Sample Outlet using the supplied ¼ compression fitting and route the tubing to a safe area. Note: Do not use more than 25ft of tubing and do not allow back pressure to build up in the sample flow cell. GDS Corp recommends that the outlet point be located no higher than 10 (3m) above the GDS- 58XP. Note: All GDS Corp sensors are designed to operate at ambient atmospheric pressure. Restricting the output in any way may create back pressure in the sensor flow cell that will generate erroneous readings and may damage the sensor if excessive pressure is present for long periods of time. Page 9

10 GDS-58XP Sample Draw System Users Manual V2.1 3 INITIAL SETUP 4.1 Flow Setup Once hardware installation is completed, apply power to the GDS-58XP and verify that the display is operational. Adjust the Sample Flow Meter to indicate 0.5 liters per minute of flow. If the flow meter does not indicate proper flow, check the inlet tubing for restrictions or blockage. To verify that the pump is running properly, set the Run / Cal valve to the CAL position (pointing to the RIGHT). The pump should be able to pull in excess of 1.0 liters / minute (full scale on the flow meter). If full scale flow cannot be obtained, check the sample outlet tubing for blockage. If normal flow cannot be obtained, contact GDS Corp. To check the Low Flow switch, set the Run / Cal valve to the blocked position (pointing straight up). The flow switch should activate and the FLOW OK message will be replaced by a FAULT indication. 4.2 Adjust Alarm Levels Using a magnetic wand, select the GASMAX Main Menu by placing the magnet next to the EDIT switch located on the lower right side of the GASMAX II display. Select ALARMs to adjust the levels, polarity on/off delays and other alarm-related settings. 4.3 Verify Remote Readings From the Main Menu, select DIAGNOSTICS. The GASMAX II will request an Access Code. Enter the access code by moving the magnetic wand over the UP key four times. The UP key is located on the upper left side of the GASMAX display. Activate the EDIT key to confirm. Select OUTPUT SIMULATION to set the 4-20mA signal to any value between 4ma (Zero) and 20mA (Full Scale). Confirm that the reading on the GASMAX matches the reading shown on any remote display or controller. Select RELAY TEST to activate the internal alarm relays and confirm that any remotely connected devices operate as expected. 4.4 Initial Calibration The GDS-58XP is now ready for initial calibration. See Section 5.2 for detailed instructions. Page 10

11 GDS-58XP Users Manual V2.0 4 OPERATION & MAINTENANCE 5.1 Overview Standard maintenance for the GDS-58XP consists of periodic checks on flow settings and sensor calibrations. Each time a toxic sensor is calibrated, a Sensor Life reading will appear that gives an approximate indication of the remaining sensitivity. Sensor Life is not necessarily linear and a rapid reduction in the senor life reading can be due to temperature extremes, high levels of target gas, the presence of certain gases that poison toxic sensors and other environmental factors. Sensor life readings also appear for combustible or PID sensors, but as these sensors operate on different principles and/or contain microprocessors that compensate for aging effects, the values shown may not accurately represent sensor life over time. Always check the flow meter for the presence of moisture. In the event that moisture or liquid is drawn in the GDS-58XP, the entire unit should be disassembled and cleaned. In some cases the flow meter or flow switch may need to be replaced. If liquid is drawn into the GDS-58XP, always inspect the sensor for any sign of damage. 5.2 Calibration On average, calibration should be performed approximately every two to three months, depending on target gas and sensor performance. Obtain a cylinder of calibration gas that is approximately ½ scale (For example, for a ppm range, obtain 50 ppm gas). If it cannot be guaranteed that the ambient air contains no target gas, also obtain a cylinder of zero air. In addition, a fixed flow regulator (0.5 to 1.0 liters / minute) and connecting tubing are required. Finally, make sure you have a magnetic wand to activate the GASMAX II monitor user interface. Important: Using the magnetic wand, activate the NEXT key until the GASMAX shows the dual display screen (see Fig 4.). If the message FLOW OK message is shown on the TOP display, the unit contains a BRIDGE type sensor and calibration should be done to the BRIDGE/MA Channel ONLY. If the FLOW OK message is shown on the BOTTOM display, the unit contains a TOXIC sensor and calibration should be done on the O2/TOXIC Channel ONLY. Page 11

12 GDS-58XP Sample Draw System Users Manual V2.1 Set the Run / Cal valve to the CAL position (pointing to the RIGHT). If the area may contain ppm levels of the target gas, attach a cylinder of Zero Air to the cal port using the fixed flow regulator. Open the valve on the regulator and confirm that the flow meter indicates gas flow. Using the magnetic wand, activate the NEXT key until the GASMAX shows the dual display screen (see Fig 4.). Put the GASMAX II in CAL MODE by activating the CAL key (lower left) followed by the EDIT key to confirm. When the SELECT INPUT screen appears, select O2/TOXIC or BRIDGE/MA as necessary (see above). The display will indicate when to apply ZERO gas. Once the reading is stable, activate the EDIT key to confirm. The display will now say to apply SPAN gas. ALM RST UP/ ALM1 ALM2 FAIL NEXT 17.8 % O2 Def. 0 % LEL DOWN/CAL EDIT A1 A2 RXD RS485 TXD Remove the cylinder of zero air and attach the cylinder of calibration gas. Open the regulator and verity flow on the flow meter. Once the reading stabilizes, activate the SPAN key to confirm. If readings are within proper limits, the message CAL SUCCESSFUL will appear. Fig 4 Dual Display Mode. Disconnect the cylinder of calibration gas and set the Run / Cal valve to the Run position (pointing LEFT). 5.3 Sensor Removal / Replacement To remove & replace the GDS-58XP sensor: 1) Loosen and remove the stainless steel tubing that is attached to the sensor flow cell 2) Loosen the set screw located at the top of the sensor flow cell 3) Remote the flow cell by gently pulling down and twisting at the same time. 4) Unscrew the sensor head cover. Use sensor head wrench (p/n ) if stuck. 5) Remove the sensor by pulling straight down. DO NOT TWIST. 6) Install the new sensor by aligning the arrow on the sensor with the engraved arrow on the sensor head. Press UP to install sensor. DO NOT TWIST. 7) Reinstall the stainless steel sensor head cover. Tighten securely. 8) Reinstall the sensor flow cell. Use approved O-ring grease (p/n ) if necessary. 9) Reinstall the stainless steel tubing and tighten securely. 10) Verify operation and calibrate new sensor. Page 12

13 GDS-58XP Users Manual V2.0 5 SPARE PARTS 6.1 GDS-58XP Spare Parts Flow switch, non-explosive Pump, 24VDC brushless Flow meter, 0-1 liter / minute with adjustment Flashback arrestors Flow cell 6.2 GASMAX Spare Parts Display assembly Relay / MODBUS interface board Power supply board with ribbon cable and standoffs 6 WARRANTY 7.1 Overview The GDS-58XP electronics is warranted for a period of two years from date of shipment. The Sample Pump and Sensor are warranted for a period of one year from date of shipment. Toxic sensors have a limited shelf life and will lose sensitivity over time, even if not used. Combustible and PID sensors have no such shelf life limitations. Page 13

14 GDS-58XP Sample Draw System Users Manual V2.1 7 APPENDIX 8.1 MODBUS Registers The GASMAX II gas monitor provides more than 100 readable MODBUS variables. Shown below are three that can be used to read system values and alarm status. See the GASMAX manual for more information and a complete listing of MODBUS registers. Register Alias Read Value Notes D2A Raw Ch Output from O2/Toxic type sensors D2A Raw Ch Output from Bridge type sensors Alarm Status Word Bits See GMII manual for bit definitions Ch1 Sensor Life Calculated O2/Toxic sensor life % remaining Ch2 Sensor Life Calculated Bridge sensor life % remaining 8.2 Moisture Calculations When drawing a sample that contains significant moisture, it is important to understand how much moisture may be entrained within the coalescing filter. At 0.5 liters per minute, the GDS-58XP will draw approximately 720 liters (0.72 m 3 ) of sample in a 24 hour period*. Sample Temp Sample RH Water content, g/m 3 Total water content Total coalesced water in 24 hrs* 20 C / 68 F 40% RH 9.4 g/m g/m g = 0.09 oz 60% RH 9.4 g/m g/m g = 0.13 oz 80% RH 9.4 g/m g/m g = 0.18 oz 100% RH 9.4 g/m g/m g = 0.23 oz 30 C / 86 F 40% RH 30.4 g/m g/m g = 0.29 oz 60% RH 30.4 g/m g/m g = 0.44 oz 80% RH 30.4 g/m g/m g = 0.59 oz 100% RH 30.4 g/m g/m g = 0.73 oz 40 C / 104 F 40% RH 51 g/m 3 20 g/m g = 0.48 oz 60% RH 51 g/m 3 31 g/m g = 0.75 oz 80% RH 51 g/m 3 41 g/m g = 0.99 oz 100% RH 51 g/m 3 51 g/m g = 1.2 oz 50 C / 122 F 40% RH 83 g/m 3 33 g/m g = 0.8 oz 60% RH 83 g/m 3 50 g/m 3 36 g = 1.21 oz Page 14

15 GDS-58XP Users Manual V2.0 80% RH 83 g/m 3 66 g/m g = 1.6 oz 100% RH 83 g/m 3 83 g/m g = 2.0 oz For example, the standard filter will hold approximately 3 oz of coalesced water. At 20 C / 40% RH, the filter will need to be drained every 30 days. For a sample at 40 C and 80% RH, the filter may need to be drained every three days. For high moisture applications, GDS Corp recommends the combination coalescing / bypass filter that will remove moisture and particulate in a continuous stream. For ambient sources of sample gas, this may require the installation of an upstream pump to force the sample through the filter and bypass port. 8.3 GASMAX Configuration The GASMAX gas monitor is a two-channel device, and the GDS-58XP relies on the unused GASMAX channel to monitor the low flow switch and generate a relay contact closure (FAULT) if the low flow condition is detected. If a BRIDGE-type sensor is installed (Combustible, Infrared for Photoionization), then the flow switch is monitored by the O2/TOXIC channel (Ch1). If an oxygen deficiency or toxic gas sensor is installed, the flow switch is monitored by the BRIDGE/mA channel (Ch2). To properly configure the GASMAX in the event the display is replaced, or if a Cold Boot is necessary to restore proper functionality, the following settings will need to be made to the default settings: GDS-58XP with Oxygen or Toxic Gas Sensor: 1. Turn on the Bridge/mA Channel by holding the magnet over the NEXT key until the menu shows Enter Key Sequence menu. Enter four UP keys to access the XMITTER CONFIG menu. Select BRIDGE/mA and hit EDIT to turn the channel ON. Hit the NEXT key to exit. The GASMAX will reboot. 2. Setup EUNITS: Once the GASMAX reboots, hit the NEXT key unit the dual display appears. Hit EDIT once and then once again to access the Select Input menu. Select the O2/TOXIC channel and hit EDIT again. Under System Config, change the EUNITS to read FLOW OK. 3. Ensure that the flow switch is connected to the R and C terminals on TB2 on the back of the display module. Polarity is not important. GDS-58XP with Bridge/mA Combustible, Infrared or Photoionization Gas Sensor: 1. Setup EUNITS: Hit the NEXT key unit the dual display appears. Hit EDIT once and then once again to access the Select Input menu. Select the BRIDGE/mA channel and hit EDIT again. Under System Config, change the EUNITS to read FLOW OK. 2. Ensure that the flow switch is connected to the _ and terminals on TB1 on the Power Supply board attached to the back of the explosion proof enclosure. Polarity is not important. Page 15