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Reference Manual
00809-0100-4021, Rev DA
November 2004
Rosemount 3144P
2-4
Table 2-1. Transmitter Switch
Locations.
Write Protect Switch (HART and F
OUNDATION Fieldbus)
The transmitter is equipped with a write-protect switch that can be positioned
to prevent the accidental or deliberate change of configuration data.
Alarm Switch (HART)
The transmitter monitors itself during normal operation with an automatic
diagnostic routine. If the diagnostic routine detects a sensor failure or a failure
in the transmitter electronics, the transmitter goes into alarm (high or low,
depending on the position of the failure mode switch).
The analog alarm and saturation values that the transmitter uses depend on
whether it is configured to standard or NAMUR-compliant operation. These
values are also custom-configurable in both the factory and the field using the
HART Communications. The limits are
•21.0 ≤ I ≤ 23 for high alarm
• 3.5 ≤ I ≤ 3.75 for low alarm
Table 2-2. Values for standard
and NAMUR operation
Simulate Switch (F
OUNDATION Fieldbus)
Simulate switch is used to replaces 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.
MOUNTING If possible, mount the transmitter 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 2-3, is advisable. Remove the terminal compartment
cover periodically and inspect the transmitter for moisture and corrosion.
Switch Location
Switches
(1)
LCD
Connector
4.4 in. (112 mm)
4.4 in. (112 mm)
(1) Alarm and Write Protect (HART),
Simulate and Write Protect (F
OUNDATION Fieldbus)
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