7
3-1. Required Tools
Tool Purpose
Pointer puller Pointer removal
Small screwdriver Calibration adjustments
Medium screwdriver Bezel removal/DPU bracket screws
Spanner wrench
(p/n 0163-0005B) DPU Range screw adjustment
1/8" Open-end wrench Calibration adjustments
3-2. DPU Test/Calibration/Maintenance Equipment
Refer to the appropriate (separate) DPU Manual.
3-3. Bezel and Lens Installation and Removal
Whenever the bezel/lens is installed, the bezel gasket (0277-0026C) must be
installed as shown below:
The two snubbers (0266-0028C) on the scaleplate should not be compressed
against the lens cover and the pointer should not touch the lens.
Notice
Ensure correct bezel gasket orientation before placing instrument
back in service. Incorrect bezel gasket orientation will cause the
instrument indicator to jam, resulting in inaccurate readings.
3-4. Calibration Check
Normally all that is required to put indicator into service is to verify that it
remains at factory-set calibration by performing the following calibration check:
1. Securely mount indicating switch in an appropriately level position and con-
nect DPU to a standard pressure source, per appropriate DPU manual.
2. If zero indication is incorrect, remove bezel/lens and reset pointer to zero
by holding pointer with ngers and turning hub with a wrench. Replace
bezel/lens.
3. To test for reverse travel, connect pressure source to low-pressure housing
and vent high pressure housing. Apply pressures approximately 150% of
the differential pressure range. The pointer should move approximately 5%
to 10% below zero.
(Continued on next page...)
SECTION 3 - MAINTENANCE/CALIBRATION
To remove the bezel and
cover lens:
1. Loosen three screws
on the front of bezel.
2. Tilt out bottom of bezel
and slide bezel upward.
Figure 3-1. Bezel/Lens
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