Remote Diaphragm Seal Mounting Information; Figure 10 - Representative Remote Diaphragm Seal Transmitter Installation; Table 5 - Flange Mounting Guidelines; Table 6 - Remote Diaphragm Mounting Details - Honeywell ST 700 User Manual

3.4.6 Remote Diaphragm Seal Mounting Information

The combination of tank vacuum and high pressure capillary head effect should not
exceed nine (9) psi (300 mmHg) absolute. For insulated tanks, be sure to remove enough
insulation to accommodate the flange extension. The end user is responsible for supplying a
flange gasket and mounting hardware suitable for the service condition of the Transmitter.
Mount the Transmitter flanges within the limits in
tubes, with a tank at one (1) atmosphere.
Silicone 200 Oil
Chlorotrifluorethylene (CTFE)
Refer to for a representative remote diaphragm seal installation. Mount the Transmitter at a remote
distance determined by the length of the capillary tubing.
Figure 10 – Representative Remote Diaphragm Seal Transmitter Installation
Depending on Transmitter model, connect the remote seal to the tank according to Table 6.
Transmitter
Model
Transmitter High Pressure (HP) Side
STR73D
to tank wall lower flange mounting.
Revision 2.0
Table 5 – Flange Mounting Guidelines
Fill Fluid
<22 feet (6.7 meters) below the Transmitter
<11 feet (3.4 meters) below the Transmitter
Table 6 – Remote Diaphragm Mounting Details
Connect the Remote Seal on ....
Variable Head
ST 700 Smart Pressure Transmitter User's Manual
Table 5 for the fill fluid in the capillary
Mount the Flange...
Fixed or Constant Head
Transmitter Low Pressure (LP) side to tank
wall upper flange.
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