AMOT 2230C, Инструкция по установке, эксплуатации и обслуживанию, Страница: 17 / 20

17
Maintenance
OMM223000015 Rev 2 – May 06
Section 5
Maintenance
Contents
Para Page
5.1 Introduction ............................................................................ 17
5.2 Test the Setpoint...................................................................... 17
CAUTION
To satisfy the ATEX requirements, the external surface of the Valve
must be cleaned on a regular basis to prevent the accumulation of
potentially flammable dirt/spillages.
Where the control medium is flammable, the Valve must be inspected
at weekly intervals for leaks to minimise the risk of explosion.
5.1 Introduction
There are no user serviceable components in the 2230/4430 Temperature
sensing Valves.
The setpoint is preset by AMOT and it is recommended that the unit is
returned to AMOT if the setpoint requires adjustment. To test the setpoint,
refer to Section 5.2.
Maintenance of the 4054 Trip Indicator is described in OMM405400037.
5.2 Test the Setpoint
WARNING
To avoid injury, ensure that the process and control mediums are
cooled, drained and isolated before the Valve is removed from the
pipework.
1 Ensure that the process and control mediums are cooled, drained and
isolated.
2 Remove the Valve from the pipework.
3 Fit a device to the “VENT” port to provide an indication when the Valve
trips.
4 Fit a 4 bar (60 psi) pressure source to the “IN” port.
5 Immerse the Valve temperature element into a container filled with well
agitated water or glycol (depending on the temperature) and a
thermometer to indicate the temperature.