7. Maintenance
7-1. Maintenance intervals and items
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Main services
Power supply
check
: Checks the power supply voltage.
Verifies that the power lamp lights up.
(Verifies that relevant points can be identified on the system.)
(When a UPS (uninterruptible power system) is used, checks the operation with the
UPS.)
Concentration
display check
: Verifies that the concentration display value is zero by using the zero gas.
Performs zero adjustment if the reading is incorrect.
Flow rate check : Checks the flow rate indicator to find abnormalities.
Checks the flow rate by using an external flow meter to verify the correctness of the
flow rate indicator on the gas detector. If the flow rate is incorrect, performs the flow
rate adjustment.
Filter check
: Checks the dust filter for dust or clogging.
Replaces a dirty or clogged dust filter.
Alarm test
: Inspects the alarm circuit by using the alarm test function.
Checks the alarm lamps. (Checks each activation of ALM1 and ALM2.)
Checks the external alarm. (Checks the activation of the external alarm.)
Span
adjustment
: Performs the span adjustment by using the calibration gas.
Gas alarm
check
: Checks the gas alarm by using the calibration gas.
Checks the alarm. (Checks triggering of alarm when the alarm setpoint is
reached.)
Checks the delay time. (Checks time to delay until the alarm is triggered.)
Checks the alarm lamps. (Checks each activation of ALM1 and ALM2.)
Checks the external alarm. (Checks the activation of external alarms, such as a
reset signal.)
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 and parameters.
Replacement of
consumable
parts
: Replaces consumable parts, such as a sensor, filter and pump.
