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4.2 Piping ST 3000 Transmitter, Continued
ATTENTION
Care must be taken when installing transmitters on hot processes. The
operating temperature limits for the device (as listed in Table 6) 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 °F) in the temperature
of the process for every foot (305 mm) of ½ inch uninsulated piping.
Process connections
Table 12 describes typical process connections for a given type of
transmitter.
Table 12 Process Connections
Transmitter Type Process Connection
Differential
Pressure
• Process heads with 1/4-inch NPT female connection.
• Flange adapters and manifolds with 1/2-inch female
connection are optional.
• Models with pseudo flange on one side include
2- or 3-inch ANSI class 150 flange.
Gauge Pressure
• Process head with 1/2-inch NPT female connection
(Series 100 transmitters).
• In-line 1/2-inch NPT female connection (STGxxL).
• Process heads with 1/4-inch NPT female connection
(STG9x4).
• Flange adapters and manifolds with 1/2-inch female
connections are optional (STG9x4).
• 2-inch Sanitary Tri-Clamp (STG1xT).
• Flush mount in 1-inch weld sleeve, with O-ring and
locking bolt (STG9xP).
Absolute Pressure
• Process head with 1/2-inch NPT female connection.
(STAx2, x40).
Flange Mounted
Liquid Level
• Small flange 1/2-inch, 1-, 1 ½ - and 2-inch (STFxxT)
• 2, 3- or 4-inch flange with flush or 2-, 4- or 6-inch
extended diaphragm (See Table 13) on high pressure
side.*
• DN 50, 80, or 100 PN 40 flange with flush or 2, 4 or 6
inch extended diaphragm (See Table 13) on High
Pressure Side*.
Remote
Diaphragm Seals
See Model Selection Guide for description of available
Flanged, Threaded, Chemical Tee, Saddle, and Sanitary
process connections.
* Reference side has standard differential pressure process head.
Continued on next page
36 ST 3000 Release 300 Installation Guide 2/05