Table 10 Suggested Transmitter Location For Given Processes; Figure 14 Typical Piping Arrangement For ½" Npt Process Connection - Honeywell ST 3000 User Manual

Figure 14 Typical Piping Arrangement for ½" NPT Process Connection
Transmitter location
Table 10 lists the mounting location for the transmitter depending on the process.
Process
Liquids
Gases
ATTENTION
• For liquid or steam, the piping should slope a minimum of 25.4 mm (1 inch) per 305 mm (1
foot). Slope the piping down towards the transmitter if the transmitter is below the process
connection so the bubbles may rise back into the piping through the liquid. If the transmitter
is located above the process connection, the piping should rise vertically above the
transmitter; then slope down towards the flowline with a vent valve at the high point.
•
For gas measurement, use a condensate leg and drain at the low point (freeze protection
may be required here). See Appendix C for some suggested freeze protection solutions.
ATTENTION
Care must be taken when installing transmitters on hot processes. The operating temperature
limits for the device (as outlined in Table 3) 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 degree C drop (100 degree F) in the temperature
of the process for every foot of 1/2" uninsulated piping.
10/05
Tank Wall
Block-off Valve

Table 10 Suggested Transmitter Location for Given Processes

1.
Below but close to the
elevation of the process
connection.
2.
Level with or above the
process connection.
Above the gas line
ST 3000 HART Transmitter Release 300 User Manual
4— Installation - Piping ST 3000 Transmitter
1/2" NPT
Connection
Suggested Location Explanation
1.
This minimizes the static
head effect of the
condensate.
2.
This requires a siphon to
protect the transmitter from
process steam. The siphon
retains water as a "fill fluid."
The condensate drains away
from the transmitter
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