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.
Failure to follow this caution can result in minor or moderate injury.
Maintenance must be performed according to standards EN 60079-17 and EN 60079-29-2 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.
In case of high dust or water pollution is expected then the calibration intervals should be shortened.
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. For calibration a
test gas cylinder can be used.
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 300 mA.
5.1.1 Zero Calibration
• Apply zero gas to the sensor using the appropriate calibration adapter.
• Wait for approximately 2 minutes or until the sensor reading has stabilised.
• Adjust the controller until the correct reading is obtained.
Gas flow rate : 1.0 l/min
Zero gas : synthetic air or component-free ambient air
5.1.2 Span Calibration
See also Section 5.3 .
• Apply span calibration gas to the sensor using the appropriate calibration adapter.
• After the reading has stabilised adjust the controller until the correct reading is obtained.
• Remove calibration adapter.
GB Series 47K 14
5 Maintenance and Service
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