13
Model 764 Differential Pressure Transmitter
Section 3
Section 3—Installation and Operation
!
WARNING: Failure to follow instructions for removing the transmitter
cover may damage the transmitter cover and case. This could result in
a serious degradation of transmitter performance during design basis
events, resulting in a potential degradation of safety systems. To avoid
the potential for equipment degradation, see Transmitter Cover Removal,
page 25
).
Unpacking/Inspection
The instrument should be inspected at the time of unpacking to detect any
damage that may have occurred during shipment.
IMPORTANT: The unit was checked for accuracy at the factory. Do not change any of
the settings during examination or accuracy will be affected.
After final cleaning, a polyethylene bag is used to protect the instrument from
contamination. This bag should be removed only in a clean area.
Pre-Operating Instructions
The following steps must be performed at the time of installation to ensure
that the instrument will perform to its original calibration.
1. Verify that the transmitter is mounted in an approximately level plane
(see Mounting below).
2.
Verify that the transmitter is properly connected to the pressure source
(see Piping,
page 14
).
3. Verify that electrical connections are in accordance with the schematic
diagram (see Electrical Connections,
page 15
).
Perform the initial calibration adjustments (see Initial Calibration Adjust
-
ments,
page 19
).
Mounting
Mount the instrument on wall or rack with four 5/16" (8mm) bolts, Grade 5
or better, and torque to 10-20 ft-lb. Mounting structures shall be designed to
avoid resonance and/or keep resulting amplification below 33 Hz. Interfacing
process tubing and conduit shall be supported by the same mounting as the in-
strument base to minimize relative motion of the instrument and connections.
Vibration
Minimize vibration by mounting the instrument on a secure support.
