SECTION V
MAINTENANCE
5.1
Introduction
Maintaining a Platinum Series
transmitter consists of three
phases:
•
Routine mechanical maintenance
•
Routine performance checks and adjustments
•
Verification of control and calibration of circuits
A suggested list of tasks is provided in Table 5-1, Sample
Maintenance Log.
Since each transmitter operates in a different environment, you
should adjust the schedule of maintenance as necessary to suit
the particular on-site conditions.
5.2
Air Filter Replacement
Disposable filter media is used for the cabinet air filters. They
must be changed as necessary to allow sufficient air movement
through the cabinet. To establish baseline performance, make the
following measurements:
a. Connect a sensitive manometer (such as Dwyer model
40-1) to the small hole in the rear door near the top (see
Figure 5-1).
b. Measure the pressure drop across the filters when new.
Then, block one side of the air input to the cabinet and
measure again.
c. Record these values for future reference.
d. Change the filters when the restriction is equal to 50% of
pressure drop measured above. Use Harris part number
448-0921-000, American Air Filter #627130500, or
equivalent filter for replacement.
5.3
Air Switch Adjustment
Turn transmitter OFF and open rear door of the cabinet requiring
adjustment.
Remove the tubing connecting the air switch to the port on the
divider panel.
Connect a length of tubing from the air switch tube to a tee
connector at the manometer. See Figure 5-2.
Check for +12 volts at J-3 pin 12 on the slave controller, then
connect the volt meter to pin 2.
Connect a source of vacuum to the tee at the manometer, and
gradually supply vacuum until +12 volts appears at J-3 pin 2.
Note the manometer reading when the air switch closes.
Adjust the air switch threshold to -0.25 inches H
2
0 column. Turn
the adjustment screw in top of cabinet clockwise to increase the
pressure differential required to activate the switch, or counter-
clockwise to decrease the differential.
Remove vacuum and check to see that J-3 pin 2 falls to 0 volts.
Reconnect the air tubing in the cabinet and check for normal
operation. Press transmitter ON, and confirm air switch opera-
Figure 5-1. Air Test Location
Figure 5-2. Air Switch Adjustment Test Setup
Rev. B: 1/11/1999
888-2365-001
5-1
WARNING: Disconnect primary power prior to servicing.
Summary of Contents for Platinum Series
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