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 calibration 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 then 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.
SELECT SCALE REQUIRED
Place the factory supplied jumper in one of the four positions to select an input
range. (Refer to “Selecting The Input Range” section for more information.)
ENTER (-)100% OF PROCESS
Apply (-) full scale of the range which was selected. Allow the signal to
stabilize for 20 seconds before pressing “P”.
“StEP 1” (Press “P”)
ENTER ZERO REFERENCE
Apply 0 volts by shorting the inputs together.
“StEP 2” (Press “P”)
ENTER (+)100% OF PROCESS
Apply (+) full scale of the range which was selected. 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 IMD1 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 IMD1 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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