Oldham olct ir, Техническое руководство

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5
– Maintenance
15
Verification

Required equipment
- gas calibration kit (calibration gas cylinder and its accessories)
- bump test cup (P/N 6313829)

Procedure
- place the test cup over the weather protection and inject the calibration gas at a flow rate of 2 liters per
minute. Check the measurement is /-10% of the calgas concentration and check the alarms.
Calibration

Required equipment
- gas calibration kit (calibration gas cylinder and its accessories). The calibration gas that shall be used is
indicated on the detector.
- magnetic wand (P/N 6155651) for maintenance call and settings
- calibration cup (P/N 6313863)

Preparation
- s et the controller in maintenance mode (so that the relays are inhibited)
- remove the screw (Rep. 3, Fig. 2) and remove the protective cover
- place the calibration cup as shown in Fig. 4
- connect the calibration tube to one gas inlet of the calibration cup

Procedure
Calibration is usually limited to zero adjustment. Sensitivity adjustment should be performed on very rare
occasion. Use the magnetic wand and follow the indications given by the red LED (Rep. 8, Fig. 2) according to
the instructions on the next page.
- adjust the zero in a gas-free environment
- if clean air is not available, inject nitrogen or grade air at a flow rate between 1 and 2 liters per minute to
ensure that the zero is properly adjusted; for CO
2
version, inject nitrogen (1 to 2 l/min.).
- follow the instructions as shown in the diagram on next page
- once the procedure is completed, stop injecting gas and replace the protective cover with the arrow
looking upward
- set back the controller in normal operation mode (so that the relays are no longer inhibited).
WARNING:
During the calibration, the security function is no guaranteed and the output current is blocked
at 2mA up to the end of the procedure.
For calibration, it is imperative to use the calibration gas indicated on the detector. Some
versions cannot be calibrated in the field because appropriate calibration gas is just not
available (‘gasoline’ for example). In this case, carry out a test by using an interferent gas. On
the calibration certificate attached with the detector is written the nature of the test gas and the
expected response of the detector to this gas.