• The safest medium to sample a gas line with the instrument is to connect it to an isolated sample line,
accessible by a ball valve (or another suitable alternative).
• Sampled gas will be discharged from the ‘sample out’ port of the instrument at a rate of
approximately 500ml/min.
Make sure this gas will not create a hazardous zone worse than ZONE I See Appendix
B for full description of hazardous zones.
• Flush the instrument with clean air before sampling to prevent mixing potentially reactive mixtures of
gas within the instrument.
• Verify instrument calibration before and after use to minimise the risk of falsely determining an
atmosphere as hazardous or safe.
• Do not connect a GFM436 Series instrument to gas sources at greater than +50 mbar above
atmospheric pressure.
• Do not operate the GFM436 in ambient temperatures outside the range of -10 to +40 °C
• Do not attempt to dismantle the instrument. It contains no user replaceable parts.
• Do not operate the unit if it is damaged in any way (i.e. loose front panel, missing screws etc.).
• Do not connect or remove electrical connectors on the top of the instrument in the hazardous area.
• Do not use (i.e. power on) the instrument while charging.
• Only charge the batteries in a safe well-ventilated area using the charger supplied.
• Ensure correct filter is used on the Gas In port – If any doubt please contact Gas Data
• Use only Gas Data spares and accessories – See spares list.
For further information please refer to:
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Gas Data cannot accept any liability for loss or damage due to its usage. Satisfy yourself
that the unit is suitable for the application that you intend to use it for. If in doubt about the suitability of a
GFM426 Series instrument for a particular application call Gas Data Ltd for further advice.
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