Field / Wall Monitoring System GD-250


Field / Wall Monitoring System GD-250

The Field Mounted Monitor is a single gas multipurpose monitor that combines simplicity and high performance
in a low cost, low maintenance package. The rugged NEMA 4X or 7X assembly is suitable for a variety of industrial, commercial and general purpose applications to monitor hazardous, toxic gases or oxygen in process flue gas or ambient air. Model GD-250 single channel digital control modules are designed to supervise and display the status of a single integral or remote sensor assembly. It is housed in a NEMA 4X wall mount enclosure or Ex-proof enclosure.


GD-250, single channel controllers interface with industry standard two or three wire 4-20 mA sensor or other standard voltage / current sensor transmitters and provide the user with concentration display and two independent adjustable alarm levels. The 3½ digit LED or Alphanumeric LCD display can read the concentration. LEDs on the front panel provide an indication of all three alarms.
The alarm relays can be programmed to be either latching or non-latching and to activate either as a rising or falling alarm. The relays are SPDT Form C type rated at 5 Amps to provide direct alarm action, reducing the need for interposing relays. Local alarm devices can be connected to the configurable onboard alarms. The Fail-safe supervisory provides a reliable indication that the monitor is fully operational. The ‘Failsafe’ design monitors the input power and status of the power supply for the amplifiers. A failure of any one of these functions illuminates a ‘Fault’ LED. ENDEE offers 10 different sensor technologies, command of each of these technologies enables us to “Fit the Product to the Application”, and assure long-term service, reliability & optimal performance in every application.


Type Portable
Detectable gases/parameters Toxic, Explosives, Oxygen
Electronics / processor Micro-controller
Power supply 230 VAC, 50 Hz
Display Graphic LCD
Alarm LOW & HIGH visual alarms, adjustable
Output 4 – 20 mA Standard, RS 485, ETHERNET port
Technology Sensor Dependent
Resolution 1 %V/V, 1 %LEL, 0.1 PPM
Accuracy ± 2%
Response time Less than 30 sec
Operating temperature 0 to 55 °C
Sampling Diffusion / suction
Housing Plastic / Di-cast Aluminium
Accessories Data logger, cable, hooter-flasher, RS 232, RS 485, MODBUS


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