Remote Diaphragm Seal Mounting Information; Figure 11 - St 700 Standard Transmitter - Representative Remote Diaphragm Seal Transmitter; Table 6 - St 700 Standard Transmitter - Flange Mounting Guidelines; Table 7 - St 700 Standard Transmitter - Remote Diaphragm Mounting Details - Honeywell ST 700 User Manual

4.4.7 Remote Diaphragm Seal Mounting Information

The combination of tank vacuum and high pressure capillary head effect should not
exceed nine (9) psi (300mmHg) 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.
Table 6 – ST 700 Standard Transmitter - Flange Mounting Guidelines
Silicone 200 Oil
Chlorotrifluorethylene (CTFE)
Refer to Figure 11 for a representative remote diaphragm seal installation. Mount the Transmitter at a
remote distance determined by the length of the capillary tubing.
Figure 11 – ST 700 Standard Transmitter - Representative Remote Diaphragm Seal Transmitter
Depending on Transmitter model, connect the remote seal to the tank according to
Table 7 – ST 700 Standard Transmitter - Remote Diaphragm Mounting Details
Transmitter
Model
Transmitter High Pressure (HP) Side
STR73D
to tank wall lower flange mounting.
Revision 8.0
Fill Fluid
<22 feet (6.7 meters) below the Transmitter
<11 feet (3.4 meters) below the Transmitter
Installation
Connect the Remote Seal on ....
Variable Head
ST 700 SmartLine Pressure Transmitters User's Manual
Table 6 for the fill fluid in the capillary
Mount the Flange...
Fixed or Constant Head
Transmitter Low Pressure (LP) side to tank
wall upper flange.
Table 7.
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