envea VIEW 370, Руководство пользователя

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8 Maintenance VIEW 370/373
36
(PC-000855-MA Issue 6, December 2021)
ENVEA UK Ltd
messages are created. The meaning of these messages is explained in the table
below.
Message
Time after
installation
Action required
Inspection due
6 months
Remove the sensor from the stack
for inspection and cleaning
Service due
12 months
Arrange service visit by ENVEA
Service Engineer or a local
representative
Major Service due
4 years
Recommended return to ENVEA for
testing and refurbishment if
required
Messages advising inspection are displayed one month prior to the due date. If
messages are not cleared within a month,
‘ Overdue ’ messages will be displayed,
and the control unit LED will flash
RED
.
8.3.1 Clearing Service Messages
All active service messages can be cleared by entering Maintenance mode,
performing the required servicing actions on the sensor, and then returning to
normal operation (see page 33 for details).
8.4 Inspecting and Cleaning the Sensor
The nature of many processes is such that a build-up of particulate may develop
on the sensor rod. This build-up will normally not affect the instrument's
performance, but it is recommended that the build-up is periodically removed.
If the probe rod requires cleaning, remove the sensor from the duct and
thoroughly clean the entire rod, paying particular attention to the area of the non-
metallic insulator and about 25 mm (1
″
) of the metal parts on either side of the
insulator (the aim is to prevent shorting across the insulator). The cleaning may
be performed using wire wool, or for sticky or stubborn deposits, a cleaning agent
may be used (use a fast-drying solvent cleaner
– not water! ).
Always ensure that the probe rod is thoroughly dried before refitting to the
ductwork.
Preparation :
Put the sensor(s) into Maintenance mode. This will force 4-20 mA outputs to 4
mA and disable relays (see
SECTION
8.2 on page 33 for instructions).
At the Sensor:
1. Remove the sensor unit from the ductwork.
2. [Floating nut designs only] Ensure the lock nut is fully undone and that the
floating nut is pulled back as far as possible to expose the complete
insulator.
3. Thoroughly clean the probe rod and insulator as described above.
4. Clean off any excessive build-up from the sensor enclosure using a stiff
brush or damp (not wet) cloth.