ENMET OMNI-4000 - Manual (Page 19)

OMNI-4000 S/N 6705 and above ENMET Corporation
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1.12 Smart Block Sensor Assemblies
These sensor assemblies for the OMNI-4000 must be handled with extreme care. Impact, excess temperatures or
penetration of water can negatively affect the readings or in extreme cases destroy the sensors. See Figure 1-17 for
sensor locations.
The toxic, CO2, BRH and oxygen smart block sensor assemblies contain electronic components. One of these
components is a memory (EEPROM) in which the manufacturer has stored the characteristics of the sensor: reading
range, sundry corrective coefficients, TWA and STEL alarms, date of manufacture, serial number, etc. Also, "rate of
wear" information enables the OMNI-4000 to automatically signal the optimum moment for the replacement of a
sensor assembly.
No calibration adjustments are necessary to enact a change of smart block sensors from one gas to another. In the
interest of safety, we recommend a test with gas to check its correct operation - it is possible that the sensor was
damaged in transit and is not sensitive enough, and this can only be assessed with a gas check.
1.13 Intrinsic Safety
The OMNI-4000 has been tested and approved for intrinsic safety, which allows it to be used in hazardous
atmospheres. Opening of the instrument enclosure in a hazardous area is not allowed. The OMNI-4000 has been
passed EEX ia llc T4.
The OMNI-4000 has also been tested and certified by the Canadian Standards Association to CSA Standard C22.2
No. 152-M1984, Combustible Gas Detection Instruments. Under this standard, the performance of the combustible
gas detection channel, only is evaluated.
Figure 1-17 Sensor locations Inside the Instrument
Explosive Gas
Sensor
CO2 Sensor
(if needed)
Toxic Gas or
Oxygen Sensor
Locations