United Electric Controls VANGUARD Installation And Operation Instruction Manual page 12

3.2.1 Bump Test
❶
Select and use a test gas cylinder of a known concentration.
NOTE: Combustible sensors are maintenance-free and do not
require calibration for up to 30 months. However, UE does
recommend periodic bump testing to assure optimum performance.
❷
If the reading on the display does not match the analytical
composition of the test gas cylinder go to section 3.2.2 to calibrate
the Vanguard.
3.2.2 Sensor Calibration
❶
Select and use a test gas cylinder of a known concentration of
the sensor being calibrated. The concentration of the test gas must
be between 10% to 100% of the full scale range of the sensor.
NOTE: See Annex 1 for factory settings of expected test gas
concentration. This configuration for test gas concentration can be
changed using HART command 129.
❷
Press and hold the calibration button for 10 seconds to begin the
calibration process.
NOTE: During this process, the device will be placed in calibration
mode. The primary variable (i.e., gas concentration) will still be
transmitted to the gateway but fixed at a value of 0. A mode
bit indicating that the device is in calibration mode will also be
transmitted. This feature is to avoid false alarms during calibration.
NOTE: If there is no activity detected for 10 minutes during the
calibration mode, the device will return to measurement mode.
❸
OFFSET ZEROING
The screen shown in Figure 38 will appear. Ensure that the area is
free from hazardous gas or else apply zero air to the sensor. Press
and hold the calibration button for 10 seconds. Successful offset
zeroing will show the prompt, in Figure 39.
CH : XXX % LEL
4
PRESS AND HOLD BUTTON
TO ZERO SENSOR
OR PUSH TO SKIP
ZEROING DONE
❹
SPAN ADJUSTMENT
If either a successful offset calibration was performed or this step
was entered with no offset applied, the prompt shown in Figure 40
will be displayed.
CH : XX
4
APPLY XX %LEL CAL GAS
AND HOLD TO CALIBRATE
OR PUSH TO ABORT %LEL
❺
Apply the test gas to the sensor with the aid of the UE Vanguard
gas calibration kit.
❻
Apply the gas for a minimum of 2 minutes or until gas concentration
readings on the display are stable. (See Annex 1 for details.)
❼
Push and hold the button for approximately 10 seconds.
Successful calibration will display 'Calibration Done' on the local,
digital display (see Figure 41).
CALIBRATION
DONE
SET TO: XX %LEL
NOTE: Unsuccessful calibration will display 'Calibration
Failed' on the local, digital display. This indicates that the
sensor reading is out of specification and a new sensor is
required (see Section 4.1 Sensor Replacement).
❽
Remove calibration cup and allow gas to clear, as shown in Figure 42.
NOTE: Device will return to measurement mode when concentration
Figure 38
is less than 2% of full scale range.
CH : XX
4
REMOVE AND CLEAR GAS
THEN PUSH TO RETURN %LEL
Figure 39
12
Figure 40
Figure 41
Figure 42
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