PROGRAMMING MODULE #9 - SERVICE OPERATIONS
The indicator has been fully calibrated at the factory and will only require a
scaling operation (Pro1or2)to display the units of the process. If the unit
appears to be indicating incorrectly or inaccurately, refer to the troubleshooting
section before attempting this procedure.
When re-calibration is required (generally every 2 years), this procedure
should only be performed by qualified technicians using appropriate equipment.
Signal source accuracies of 0.01% or better are required.
The procedure consists of applying accurate signal levels to the indicator in a
series of three steps. Allow a 30 minute warm-up period before starting this
procedure.
Note: Once the access Code 48 has been entered, there is no exiting this program
module without completing the calibrating procedure.
ENTER ACCESS CODE
A code number (48) must be keyed-in prior to the calibration sequence to
guard against inadvertent entries. Access code numbers other than those listed in
this section, should not be entered at this step. If any are entered, undefined or
unpredictable operation could result.
“CodE” < > “0” to “99”
If the code number for the previous step was not recognized, the indicator returns
to “Pro 0”, with no action taken. Otherwise, the calibration procedure is started.
ENTER ZERO REFERENCE
Apply 0 mA by opening the signal input wires.
“StEP 1” (Press “P”)
ENTER 50% OF PROCESS
Apply 25 mA. Allow the signal to stabilize for 20 seconds before pressing
“P”.
“StEP 2” (Press “P”)
The indicator will display “StEP -” for ten seconds. During this interval, keep
the signal level applied until “StEP 3” appears.
ENTER 100% OF PROCESS
Apply 50 mA. Allow the signal to stabilize for 20 seconds before pressing “P”.
“StEP 3” (Press “P”)
Indicator calibration is complete. It is recommended that calibration be
checked by entering “Pro 1” and checking the displayed input values with the
signal source at different applied input levels.
SERIAL HARDWARE (loop-back) DIAGNOSTICS
The internal serial communications hardware in the IMP can be tested to
verify proper operation. The procedure consists of connecting the Serial Input
(SI), Serial Output (SO), and 20 mA Source into a simple loop, and then entering
an access code.
Connect the IMP as shown below. Enter “Pro 9”, key-in “Code 39”, and then
press “P”. If the serial communication hardware is OK, “PASS” will be
displayed. Conversely, if there is an internal problem, “FAIL” will be displayed.
After the diagnostic test is complete, press “P” to return to “Pro 0”.
“CodE” < > “39”
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