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Reference Manual
00809-0100-4697, Rev EA
October 2011
4-3
Rosemount 848T
HARDWARE
MAINTENANCE
The 848T has no moving parts and requires a minimal amount of scheduled
maintenance. If a malfunction is suspected, check for an external cause
before performing the diagnostics presented below.
Sensor Check To determine whether the sensor is causing the malfunction, connect a sensor
calibrator or simulator locally at the transmitter. Consult an Emerson Process
Management representative for additional temperature sensor and accessory
assistance.
Communication/Power
Check
If the transmitter does not communicate or provides an erratic output, check
for adequate voltage to the transmitter. The transmitter requires between 9.0
and 32.0 VDC at the terminals to operate with complete functionality. Check
for wire shorts, open circuits, and multiple grounds.
Resetting the
Configuration
(RESTART)
There are two types of restarts available in the Resource Block. The following
section outlines the usage for each of these. For further information, see
RESTART in Table 3-2 on page 3-6.
Restart Processor (cycling)
Performing a Restart Processor has the same effect as removing power from
the device and reapplying power.
Restart with Defaults
Performing a Restart with Defaults resets the static parameters for all of the
blocks to their initial state. This is commonly used to change the configuration
and/or control strategy of the device, including any custom configurations
done at the Rosemount factory.