Transmitter Location; General Piping Guidelines; Procedure To Install Flange Adapters; Table 8 - St 700 Standard Transmitter - Suggested Connection Locations - Honeywell ST 700 User Manual

4.5.2 Transmitter Location

The following are suggested connections based on what is being processed by the system.
Table 8 – ST 700 Standard Transmitter - Suggested Connection Locations
Process Suggested Location
Gases Above the gas line.
Liquids Below but near the elevation of
the process connection.
Level with or above the process
connection.
1. For liquid or steam, the piping should slope a minimum of 25.4mm (1 inch) per 305mm (1 foot).
2. Slope the piping down toward the Transmitter if it is below the process connection to allow
the bubbles to rise back into the piping through the liquid.
3. If the transmitter is located above the process connection, the piping should rise vertically
above the Transmitter. In this case, slope down toward the flow line with a vent valve at the
high point.
4. For gas measurement, use a condensate leg and drain at the low point (freeze protection may
be required here).
ATTENTION Care must be taken when installing transmitters on hot processes.
The operating temperature limits for the device (as outlined in Table 5) must not be
exceeded. Impulse piping may be used to reduce the temperature of the process that comes
into contact with the transmitter meter body. As a general rule there is a 56  C drop (100  F)
in the temperature of the process for every foot of ½ inch uninsulated piping.

4.5.3 General Piping Guidelines


When measuring fluids that contain suspended solids, install permanent valves at regular
intervals to blow-down piping.

Blow-down all lines on new installations with compressed air or steam, and flush them with
process fluids (where possible) before connecting these lines to the Transmitter Meter body.

Verify that the valves in the blow-down lines are closed tightly after the initial blow-down
procedure and each maintenance procedure thereafter.

4.5.4 Procedure to Install Flange Adapters

The following procedure provides the steps for removing and replacing an optional flange adapter on
the process head. Refer to
This procedure does not require that the Meter body be removed from the Electronics
Housing. If flange adapters are being replaced with parts from other kits (for example,
process heads), follow the procedures for the kits and incorporate the following procedure.
The threaded hole in each Flange Adapter is offset from center. To ensure proper orientation
for re-assembly, note the orientation of the offset relative to each Process Head before
removing the adapter.
Revision 8.0
The condensate drains away from the Transmitter.
This minimizes that static head effect of the
condensate.
This requires a siphon to protect theTransmitter from
process steam. The siphon retains water as a fill fluid.
Figure 13.
ST 700 SmartLine Pressure Transmitters User's Manual
Description
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