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CAUTION
Initiation of the sensor check feature will temporarily suspend
normal gas-monitoring.
The sensor check may be run in two modes:
• Manual
• Auto
MANUAL mode requires only that the proper CHANNEL(S) be selected as described above.
When the operator is ready to run the check, TEST NOW is selected from the SETUP-
CONFIGURE-INSTRUMENT-SENSOR CHECK-MANUAL menu and the checking begins
immediately.
Selecting AUTO from the SENSOR CHECK menu performs the check in a periodic manner.
This allows the SENSOR CHECK to run automatically to start at a pre-determined time and to
be performed at specific intervals. If AUTO operation is desired, entries must also be made for
the START and INTERVAL parameters (refer to section 4.4.2.1.9 for parameter entry format).
Once all entries have been made, selecting ENABLE will activate the AUTO mode.
When in AUTO mode, a power failure occurring during SENSOR CHECK will cause it to be
terminated. It will restart automatically after the power failure when the next “start time” is
reached. For example, if the unit is programmed to start SENSOR CHECK at 2 PM and a power
failure occurs at 2:01 PM, the next SENSOR CHECK will be performed the following day at
2 PM, assuming power has been restored.
Results of the SENSOR CHECK are logged in the event-queue for later retrieval. Typical
messages that would appear during and after the SENSOR CHECK are shown below. These
messages would alternate with the displayed gas concentration data resulting from the gas
supplied by the SENSOR CHECK. Display of the SENSOR CHECK results lasts for five minutes
after the SENSOR CHECK is complete:
1 SENSCHK 2 SC PASS
3 SC FAIL 4 CL 3.45
Where SENSCHK = Sensor Check in Progress
SC PASS = Sensor Passed Sensor Check
SC FAIL = Sensor Failed Sensor Check
In the event that a channel indicates a problem as a result of performing this test, refer to
section 7.0 for troubleshooting or maintenance procedures. A sensor check failure will not
shut the unit down. Once the results of the sensor check have been cleared from the display,
normal operation will continue.
3.2.2.11 Calibration Mode
Before running the calibration procedure, the operator must configure the unit for calibration
using the CONFIGURE-CHANNELS-CALIBRATION menu selection by selecting the span,
concentration and zero for each channel intended to be calibrated. The sequence that occurs
when RUN CALIBRATION is selected is shown in section 5.0. Calibration can be aborted at
any time by pressing the SETUP-STOP CALIBRATION function.
Calibration is conducted automatically by exposing the sensor to the calibration gas for up
to 5 minutes once the receiver has been placed in the RUN CALIBRATION mode (refer to
section 4.4). The receiver will evaluate the incoming signal and determine if its value and the
response times are in the proper ranges. The receiver then has the option to accept or reject
the calibration based on that comparison. This mode of calibration can be achieved even
when the sensor/transmitter is remotely located and only one person carries out the calibration.
The LED indicator located on the sensor/transmitter body will indicate whether a calibration
has been accepted or not. The operator will know immediately whether or not the calibration
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