TELEDYNE OLDHAM SIMTRONICS Everywhereyoulook DG-TT7-K, Руководство по эксплуатации

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MULTIXPLO AND MULTITOX DETECTORS
OPERATING MANUAL
NOSP17665
Revision 02a
47
7 Maintenance
The interventions described in this chapter must be performed by competent and
qualified staff. Device performances may be affected if the present instructions are
not respected.
Cartridge unplug or device opening imperatively require power to be OFF
Zero adjustment does not affect the sensitivity of the detector and vice versa.
7.1 Power off / opening of housing
All the power supply wires must be cut to put unpowered the detector
7.2 Periodic maintenance
The frequencies of calibration control are provided for information purposes only. The frequency
depends on the operating conditions, the experience and safety requirements.
However, regarding the functional safety certification of the device (SIL), an annual check is a
minimum required.
7.2.1 Preventive maintenance
A gas test is recommended every six months. Run a calibration if necessary. A zero-point
calibration with clean air has to be done first.
We recommend using gas mixture with the target gas at 50% of the measuring
range. The complement of the mixture should be Air for DG-TX7-X and air or
Nitrogen for DG-TT7-K.
Periodicity of the maintenance should be adjusted (reduced) if the device is
exposed to the conditions defined by the IP rating.