Page 14 ST 800 SmartLine Pressure Transmitters User’s Manual Revision 10
3.4.7 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 for the fill fluid in the capillary tubes,
with a tank at one (1) atmosphere.
Table 4 – Flange Mounting Guidelines
<22 feet (6.7 meters) below the Transmitter
Chlorotrifluorethylene (CTFE)
<11 feet (3.4 meters) below the Transmitter
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 – Representative Remote Diaphragm Seal Transmitter Installation
Depending on Transmitter model, connect the remote seal to the tank according to
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