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The sample gas is supplied to the FIDAMAT 6 at pressure, and passes via an anti-clogging fused silicone restrictor to the flame ionization detector.
Hydrogen (H2) is used as combustion gas. In the basic version, the FIDAMAT 6 is installed in an IP54 housing suitable for EEx(p) which is permanently purged with instrument air.
Purging prevents the formation of an explosive atmosphere in the housing should large leaks occur or if the combustion gas line breaks. To this end, any combustion gas released must be diluted down to a concentration < 25 % of the LEL. This requirement in accordance with DIN EN 60079-2 is achieved by permanent purging with instrument air at a flow rate of approx. 1 200 l/h.
The purging results in an overpressure in the protective housing. Therefore, any gas vapors which might occur occasionally cannot penetrate into the housing. The overpressure in the protective housing has a setpoint of 10 mbar. The monitored limits are between 0.8 and 15 mbar.
The purging flow rate for the protective housing and the set pressure limits are monitored.
In the event of a fault:
- The power supply to the FIDAMAT 6 is switched off
- The inputs/outputs of the FIDAMAT 6 are switched off by a Modex relay
- The supply of combustion air is switched off by a solenoid valve outside the housing
The pressure of the combustion air supply for the FIDAMAT 6 is monitored by a pressure switch whose switching point is set to approx. 200 mbar below the supply pressure. If the pressure drops as a result of a leak or a break in the combustion gas line, the combustion air supply is switched off by a solenoid valve outside the housing.
Gases or gas mixtures that are frequently or continuously flammable must not be introduced into the FIDAMAT 6 gas analyzer.
The exhaust air and exhaust gas of the FIDAMAT 6 must be routed into the non-hazardous area.
Following installation and maintenance work affecting the gas paths, a leak test must be carried out as described in the manual.