A-1
Model 752 and 752A Differential Pressure Transmitters Appendix A
Appendix A
Safety Precautions
Suggested piping diagrams and startup instructions for typical and special
ow applications are presented on the following pages.
WARNING HIGH-PRESSURE HAZARD. TO PREVENT PERSONAL INJURY
OR DAMAGE TO EQUIPMENT, DIRECT ALL PIPING AWAY FROM
THE OPERATOR WHILE CONNECTING THE DPU TO THE SYSTEM
PIPING.
WARNING EXPLOSION HAZARD. NO ORGANIC COMPOUNDS, OIL, GREASE,
DIRT, OR SCALE OF ANY KIND CAN BE TOLERATED IN AN
OXYGEN INSTALLATION.
Flow Application
Important: Assure that the DPU high-pressure housing is connected to the upstream
tap of the primary device.
Note: To prevent overheating the DPU during blowdown, monitor the tem-
perature by placing your hands on the pipe between the DPU and the
manifold pipe containing the vent valves.
Liquid Level Applications
The process media may be used as a reference leg seal uid when it is of a
type that will condense in the reference leg under all conditions. If the process
or process media characteristics are such that the above conditions cannot be
met, a special reference leg seal uid will be required.
The special seal uid must not be volatile and must not be miscible with the
process media. Also, the difference in the densities of the special seal uid
and the process media will require compensation in calculating the differen-
tial pressure range of the DPU.
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