GasPoint Gas Transmitter Installation and Operating Instructions 4-20mA Fixed Gas Monitor s
Table of Contents: Description Page Safety Information—Read First Warnings and Cautions ............ BW Technologies Contact Information ....................................... Introduction ................................................................................ Ratings and Certifications .......................................................... Installation Sensor Location ........................................................... Mounting the Enclosure .........................................
Safety Information — Read First IMPORTANT Users of the GasPoint require a full understanding of the operating and maintenance instructions. Use the monitor only as specified in this manual, otherwise the protection provided by the monitor may be impaired. Read the following Warnings and Cautions before using the monitor: Warning Do not paint the sensor assembly or the transmitter. Calibrate the monitor at start-up and BW recommends a calibration check on a regular schedule, once at least every 90 days.
Installation and Operating Instructions Manufacturer’s Notes and Warnings 1. 2. Read the Safety Warnings and Cautions at the beginning of this manual. The GasPoint is fully tested and calibrated in the factory. Installation of the GasPoint should be done by qualified personnel.
Introduction Introduction The GasPoint provides continuous monitoring of the atmosphere for hazardous gases in the workplace and is virtually maintenance-free. Its revolutionary design utilizes advanced microcontrollers and allows for enhanced diagnostics and fault analysis. Advanced design features make installation and operation simpler than ever - saving you time and money. The GasPoint transmitter provides a 4-20 mA output signal which can be connected to any control system (DCS, PLC, etc.).
Introduction Elements Drawings 1a, 1b, 1c 1a GasPoint Monitor Item 1b Control Bay Item Description 1 Cable Conduit Access 2 Explosion-proof Enclosure 3 Sensor 4 Calibration Pushbutton 1c Liquid Crystal Displays Function 1 Edit buttons: Increment / Decrement Value 2 OK button: Access User Setpoints, or Save Displayed Values 3 Faceplate Security Screw 4 Low Light Sensor 5 High / Low Alarm Settings: User Label 6 Slip Hinge Item Page Page 33 Function 1 Numeric Reading 2 Units of
Installation — Sensor Location Sensor Location Several factors should be considered when selecting locations to install sensors. The following general suggestions should be considered to assure the detection of the target gas. Select the most suitable location for each sensor. Air Currents: If there are fans, wind, or other sources of air movement, gases may tend to rise or collect in certain areas of a facility. The local air currents should be assessed to aid in selecting the sensor location.
GasPoint Installation — Enclosure Mounting the Enclosure Modular design simplifies installation of the GasPoint. The transmitter main board is mounted to the inner control door which is equipped with slip hinges. The transmitter back enclosure contains the relays and power board and is equipped with a threaded 3/4 in. NPT conduit fitting outlet and pre-drilled mounting flanges. Power and signal lines connect to the plug-in terminal block on the power board.
GasPoint — System Design Specifications Installation System Design Specifications: Supply Voltage: 12 to 32 volts Power Consumption: Catalytic Combustible Sensors: 100 mA @ 24 VDC IR Combustible Sensors: 75 mA @ 24 VDC Toxic /Oxygen Sensors: 40 mA @ 24 VDC Relays: 50 mA per relay (150 mA total) Memory: Non-volatile memory, a battery back-up is not necessary to retain values in the event of power outages.
GasPoint Installation—Cable Installation 4-20 mA Loop Installation Cable Routing: Separate cables are required for each GasPoint. In classified areas cable should be in conduit or be approved hazardous location cable. Power Supply: Ensure power supply meets the minimum requirements of all components of your system (i.e. alarms, relays, etc.). BW recommends that the power supply be regulated. Caution: Polarity must be observed.
Installation — System Wiring Figure 3: System Wiring Diagram (Exception GasPoints equipped with Communication Modules) LEGEND NC - Normally closed C - Common NO - Normally open V - 12-32 VDC G(Gnd) - Ground R - Return Vx - Voltage Tx - Transmission Rx - Return Exception Note: For wiring GasPoints equipped with the MODBUS Communication Expansion Module see applicable Manual.
Installation — Remote Sensor Separation Kit Figure 4: Sensor Separation Kit Wiring Diagram Mounting the Sensor Separation Kit Enclosure 1. 2. 3. The Separation Kit is equipped with predrilled flanges: I.D. 3065 (7.68 mm) on 4.35 in (10.6 mm) centers. Disconnect the wires from the Transmitter terminal block and remove the sensor from the Transmitter. Screw the sensor fully into the Separation Kit housing and install the wires as shown on the diagram to the adjacent terminal block in the Separation Kit.
Installation — Select Field Settings Factory Settings: The GasPoint is calibrated and tested before shipping. Prior to shipping they are factory set to the commonly used values. To change the factory default settings see the applicable section: The following settings are field selectable: Dip Switch Overview 1. Calibration Time Delay: To set span, select a time delay of 30 seconds or 6 minutes. For remote calibration use the 6 minute setting to allow time for the gas to reach the sensor.
Installation — DIP Switch Settings Dip Switches Table 4: The dipswitches are located on the upper control board. To access the dipswitch banks, remove the top of the explosion-proof enclosure, loosen the control board access screw (located just below the buttons) and open the control door which is on slip hinges. The dipswitches are clearly labeled. Caution: The GasPoint must be powered down before removing the outer cover. If it is in a classified area either remove the GasPoint or declassify the area.
Power-Up Connecting the Controller and Power Supply Ensure the GasPoint transmitter is complete with its external cover in place before applying power. Follow the procedures and recommendations in the Control Systems Manuals to complete installation. Note: Ensure the GasPoint is tied to the Controller ground, to the Earth ground and to the Negative Terminal of the power supply. 1. Attach wires to the Controller and Power Supply as shown in the wiring diagram (page 6).
Changing Setpoints Changing the Alarm Setpoints and Calibration Gas Setpoints The Setpoint Mode allows the user to change the calibration gas concentration level, the low alarm setpoint and the high alarm setpoint. See "Select Field Settings" (page 8) for factory default settings. To change the values: 1. 2. Screw off the enclosure top. (Allows access to edit buttons). Press OK button for 2 seconds to access Setpoint Mode and change factory default settings. GAS ALARM SETPOINTS: 1.
Operation Normal Operation The GasPoint provides continuous monitoring for the target gas. In the event of power failure, the GasPoint will automatically reset itself back into the system loop after power is restored. The GasPoint has non-volatile memory and will not be affected by a power disruption. All programmed information is protected with total memory retention.
Gas Alarms Advice Gas Alarm Conditions and Advice If the current gas concentration meets or exceeds either alarm setpoint, the GasPoint gas alarm functions will activate. Note: If both or either gas alarm is turned OFF (set to zero or set to the same value) then no gas alarm condition will exist for that alarm level. The following alarm advice will activate in any gas alarm condition (LOW or HIGH): The backlight will activate.
Automatic Daily Test and Sensor Advice GasPoint Sensor Advice The GasPoint sensor communicates constantly with the GasPoint transmitter, providing gas level concentrations and sensor status information such as, self-test pass/fail, sensor replacement, life expired and other status information to the transmitter.
Fault Alarm Advice Fault Alarm Conditions and Advice In the event of a fault condition, the fault alarm will trigger activating any connected field interface. GasPoint will advise which fault condition has occurred. Under Fault Alarm conditions: The non-latching fault relay be "on" de-energized during a fault condition. The backlight will activate. When the problem is corrected, GasPoint automatically returns to normal operation.
Calibration Calibration Guidelines When calibrating the GasPoint, adhere to the following guidelines. Calibration accuracy is never better than the calibration gas accuracy. BW Technologies recommends a premium-grade calibration gas. Gases with NIST (National Institute of Standards and Technology) traceable accuracy will improve the validity of the calibration. Do not use a gas cylinder beyond its expiration date. Calibrate a new sensor before use.
Calibration Automatic Calibration Routine Calibration can be run at any time during normal operation except the self-test period (from 10 minutes before the self-test until the self-test is complete). Calibration is a one man operation and virtually automatic. Note: For Calibration gas concentrations and flowrates for each gas, see Appendix A (page 25) To Calibrate perform the following steps: LCD Icons Displayed START CALIBRATION 1.
MAINTENANCE SERVICE Page 21
Maintenance To keep the GasPoint in good operating condition, perform the following basic maintenance as required: Calibrate, test, and inspect the GasPoint at regular intervals and after exposure to high concentrations. Keep an Operations Log of all maintenance, calibrations, and alarm events. Clean the exterior with a soft damp cloth. Do not use solvents, soaps, or polishes. Do not immerse the GasPoint in liquids.
SERVICE Disassembling: Observe all safety and electrical codes and regulations before removing front cover. Unscrew the thumbscrew and open the service bay door. Assembling: When re-assembling the GasPoint ensure that it is electrically complete. Close the Service Bay Door. Ensure the thumbscrew is aligned and tighten it down. Replace the outside glass cover. Re-apply power and reinitialize the transmitter Power-Up procedure (see Power-Up). Change the Alarm setpoints if desired.
APPENDIX A Sensor Information Sensor Specifications .................................................... Order Numbers .............................................................. Relative Sensitivity of combustible gases . ................... Instrument Specifications ...........................................................
Sensor Specifications Operating and Calibration Specifications Specifications Repeatability % of signal Op Temperature Range ºC ºF % of signal loss per month Catalytic Combustibles Zero: Span: LCD Increments Calibration: Note2 Flow Rate (min).
Combustible Sensor Notes: Relative Sensitivity of Combustible Gases/Vapors Recommend: For the most accurate measurements calibrate using the gas or vapor under investigation. Where this is not possible see the applicable “Catalytic or Infrared Relative Sensitivity table for Combustible Gases/Vapors”. The GasPoint catalytic and combustible sensors are calibrated to Methane (with 50% methane calibration gas) at the factory prior to shipping.
Specifications: 3-wire, 4-20 mA gas transmitter with advanced micro-controller based circuitry Power Input: 12 to 32 volts DC Output Current: Normal Operation: Isolated linear 4-20 mA output Calibration Mode: Steady 3 mA (Automatic reset to normal operation) Fault Mode: 2 mA signal (and less) Current Consumption: Toxic Versions: 40 mA at 24 VDC Catalytic Combustible Version: 100 mA at 24 VDC Infrared Combustible Version: 75 mA at 24 VDC Relays: 50 mA per relay @ 24 VDC Accuracy: ± 0.
BW Technologies Limited Warranty ORDER NUMBERS BW Technologies warrants this product to be free from defects in material and workmanship under normal use and service for a period of two years, beginning on the date of shipment. Parts, product repairs and services are warranted for 90 days. This warranty extends only to the original buyer or end-user customer of a BW Technologies authorized reseller.
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