The GMA 81 (single channel monitor) for one remote sensor, the GMA 84 (4 channel monitor) for four sensors and the GMA 88 (up to 8 sensors) are the compact models of the GMA 101 and 104 for direct wall mounting.

The GMA 81 A and GMA 84 A provide an additional bright flashlight and a buzzer (100dB) for alarm signals. Its compact design makes the GMA 81/84 the ideal system wherever only a few detection points are to be monitored.

In combination with GfG's remote sensors the new evaluation and control modules for the ideal fixed monitoring equipment for more than 100 different combustible and toxic gases and oxygen. Every controller can be flexibly adapter to its measurement task. In addition to the selection of gas and concentration the three alarm thresholds can be variably set throughout the detection range. For alarm or fault signals every controller provides 4 voltage-free relays, which can be individually set as NC or NO contacts respectively for open or closed circuit system. The 3 digit LED display allows the permanent check of the gas concentration. Detection range, gas and measurement unit are displayed on pressing a key. Menu driven zeropoint adjustment and calibration via keypad avoid unconfortable turning of potentiometers. An analog 4-20 mA output of the standardized sensor signal facilitates the connection of additional meters or recorders.

Just advise of your measurement problem, we offer the individual solution.

  - Single Channel (GMA 81), 4-Channel (GMA 84) or 8-Channel (GMA88) Models
  - Robust Enclosure for Wall Mounting Dim.: 130 x 185 x 95 mm (WxHxD)
  - With or without built-in Alarm
  - Protection Class IP 54
  - Easily Accessible Front Terminals
  - GMA81 EC Type Approval: BVS 03 ATEX G 006 X, PFG-Nr. 41300600 P