Emerson Rosemount 3144P, Reference Manual

Page: 23 / 236

13
Reference Manual
00809-0100-4021, Rev JA
Installation
April 2017
Installation
Table 2-1. Values for Standard and NAMUR Operation
Simulate switch (F
OUNDATION
Fieldbus)
Simulate switch is used to replace the channel value coming from the sensor transducer block. For
testing purposes, it manually simulates the output of the analog input block to a desired value.
2.4 Mounting
If possible, the transmitter should be mounted at a high point in the conduit run so moisture from the
conduits will not drain into the housing. The terminal compartment could fill with water if the
transmitter is mounted at a low point in the conduit run. In some instances, the installation of a poured
conduit seal, such as the one pictured in
Figure 2-5 , is advisable. Remove the terminal compartment
cover periodically and inspect the transmitter for moisture and corrosion.
Figure 2-4. Incorrect Conduit Installation
Figure 2-5. Recommended Mounting with Drain Seal
Standard operation (factory default) NAMUR-compliant operation
Fail high 21.75 mA
≤
I
≤
23.0 mA Fail high 21 mA
≤
I
≤
23.0 mA
High saturation I
≥
20.5 mA High saturation I
≥
20.5 mA
Low saturation I
≤
3.90 mA Low saturation I
≤
3.8 mA
Fail low I
≤
3.75 mA Fail low I
≤
3.6 mA
A. Sealing compound
B. Union coupling with extension
C. Conduit for field wiring D. Thermowell
E. Sensor hex
F. Poured conduit seal (where required)
Conduit
lines
Conduit
lines
A
D
B
E
F
C