6. Maintenance
6-2. Replacement parts
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Main services
Power supply check
: Checks the power supply voltage.
Status display check
: Checks that the status indicates normal measurement state.
Concentration display
check*
: Verifies that the concentration display value is zero by using the zero gas.
Performs zero adjustment if the display is incorrect.
Alarm test*
: Inspects the alarm circuit by using the alarm test function.
Checks the alarm lamps. (Checks the activation.)
Checks the external alarm. (Checks the activation of the external alarm,
such as a buzzer.)
Span adjustment
: Performs the span adjustment by using the calibration gas.
Cleaning and repair of
the unit
(visual diagnosis)
: Checks dust or damage on the surface, cover or internal parts of the unit, and
cleans or repairs such parts as needed.
Replaces parts which are cracked or damaged.
Unit operation check
: Uses the keys to check the operation of functions, parameters, etc.
Replacement of
consumable parts
: Replaces consumable parts, such as a sensor and filter.
* Check and adjustment are performed at the indicator/alarm unit side.
6-2. Replacement parts
<Replacement of Gas Sensor>
Our service engineers need to replace and adjust the sensor. Please contact RIKEN KEIKI.
NOTE
If adjustment to the standard gas concentration value fails even with the maximum sensitivity, it
indicates that the gas sensor has come to the end of its life. The gas sensor needs to be replaced.
After replacing the gas sensor, electrical adjustment and calibration using the standard gas are
necessary.
