METHEX 100 evaluator
Evaluator type GMA 30.00.5xx

METHEX 100 sensor
Sensor type GMM 01.13.180

ex ANNOVEX / MONIMET
METHEX 100
CH4-measuring equipment for the gas suction treatment

  • ex I M1 Ex ia I Ma
  • Measuring range 0.0...100.0 vol % CH4
  • Version for the gas suction treatment
  • Thermal conductivity sensor with gas diffusion entry
  • Pipe probe type RSM 01.xx with test gas connection (optional)
  • Increased accuracy by compensation of prevailing humidity and temperature by microcontroller (patented)
  • Integrated pressure compensation in the sensor chamber (optional)
  • Adjustments or status enquiries by means of a press button unit or a magnetic pointer. The housing need not be opened
  • Illuminated four-digit display
  • Code lock to prevent unauthorized manipulation (can be switched off)
  • Fault self diagnosis with alpha numeric display
  • Output range of the output signal is variable
  • Test of the output signal by simulated CH4 values
  • Choice between normed analog or digital output signals (optional)
  • Two built-in limit switches with optocouplers or relays in the monitor
  • Connecting cable between sensor und evaluator plugable
  • Components exchangeable independent of each other

The permanently installed CH4-measuring equipment METHEX 100 is characterised by their stable measurements, simple and secure operation, robustness and compact construction. They are destined for the continuous monitoring of the methane concentration in gas suction pipes.

The gas supply from the suction pipe is achieved by an pipe probe type RSM 01.xx. The pipe
probe contains a dust filter and a connection for the test gases.

The measurement of the methane concentration in the sensor block is by means of an thermal conductivity sensor. The gas diffuses into the measuring chamber through a sinter metal disc.

To increase the measurement accuracy a microcontroller continously compensates the
prevailing temperature and humidity values. A built-in pressure sensor (optional) assures for a high measurement accuracy over a wide pressure range. A self monitoring microcontroller system not only processes the measurement values precisely, it also carries out the operator specific instructions such as the entry of the code, signal instructions and messages, analog and digital outputs and test functions etc. A four digit back lit graphic display shows the measured values in 12 mm high digits.

These equipment is conform to the explosion protection rating of intrinsic safety „i“, catagory I M1 Ex ia I Ma. This means that this devices can be used in the zone M1 of underground mines, even when unpermitted high concentrations of the methane gas are prevailing. This certification conforms to the ATEX directive 94/9/EG for devices and protective systems permitted for use in areas endangered by explosions.

The operation of the device is very simple: The operator places a small magnetic press button unit on the device. The housing need not be opened. As an alternative he can also use a magnetic pointer. A four digit code which can be entered initially, protects against unauthorized changing of the set values.

The sensor is protected against shocks, dust and humidity by a cast metal housing (impact strength 20 Joule). The evaluator has a robust, electrically conducting plastic case. They are to be connected by means of the connecting cable VDL 6 with two high-quality plugs.

The electrical connection of the equipment occurs fast and in a protected manner against wrong polarity through the connecting cable VDL 4 via a high-quality plug.

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