GB
MSA MAINTENANCE AND SERVICE
Series 47K Gas Detector [SIL 2] 15
5. Maintenance and Service
There are no serviceable or adjustable parts within the sensor assembly and any
attempt to dismantle the assembly or access it will invalidate the sensor
approvals and manufacturers guarantee.
Maintenance and service may only be performed by authorised and suitably
qualified personnel.
Caution
To guarantee the nonambiguity of the series 47K catalytic sensor
operation ensure [e.g. by check with hand-held test instruments] each
time before turning on the sensors that the atmosphere to be
monitored by the sensors is free of combustible gases.
Maintenance must be performed according to standards EN 60079-17 [gas] and
EN 61241-14 [dust] or according to applicable national standards.
5.1. Calibration
According to EN 60079-29-2 the combustible gas detectors must be checked at
regular intervals to ensure that it is functioning properly in accordance with the
applicable international, national, industry-specific or company regulations.
The sensitivity and zero point of the sensor must be adjusted as necessary [every
6 months at the latest] in accordance with the operating instructions for the type
of sensor and controller it is connected to.
Sensors that are no longer able to generate the minimum signal must be replaced
[see relevant controller manual].
Allow a warm-up time of at least 30 minutes for the sensor to stabilise, before
calibration is performed.
Calibrating the Gas Detectors 47K-HT-PRP
These gas detectors must be calibrated at their ambient working temperature
using the flow through adaptor [please refer to 5.1.3 Calibration with accessories].
The specified temperature range of the 47K-HT-PRP gas detectors is -40 °C to
+160 °C and the bridge operating current is 280 mA.
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