Page 136 ST 700 SmartLine Pressure Transmitters User’s Manual Revision 13
12.5.5 Remote Diaphragm Seal Mounting Information – ST 700 Basic Transmitter,
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 Table 32 for the fill fluid in the capillary
tubes, with a tank at one (1) atmosphere.
Table 31 – ST 700 Basic Transmitter, Flange Mounting Guidelines
< 22 feet (6.7 meters) below the transmitter
Chlorotrifluorethylene (CTFE)
< 11 feet (3.4 meters) below the transmitter
Refer to Figure 51 for a representative remote diaphragm seal installation. Mount the transmitter at a
remote distance determined by the length of the capillary tubing.
Figure 51 – ST 700 Basic Transmitter - Representative Remote
Diaphragm Seal Transmitter Installation
Depending on transmitter model, connect the remote seal to the tank according to Table 32.
Table 32 – ST 700 Basic Transmitter - Remote Diaphragm Mounting
Details
Connect the Remote Seal on ….
Transmitter High Pressure (HP) Side
to tank wall lower flange mounting.
Transmitter Low Pressure (LP) side to
tank wall upper flange.
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