PROGRAMMING AREARAE-Gamma
4-12
4.4.4 Single Sensor Calibration
This procedure determines the second point of the sensor
calibration curve for a single sensor. A standard reference gas
(span gas) is needed to perform this procedure. Table 2.2
(Alarm Limits and Conditions) shows the standard calibration
gas which is typically used as the span gas at the factory.
1. Continuing from Step 4 or Step 6 of the previous section,
the display should show “Single Sensor Calibration?”
Press [Y/+]. The display shows all the installed sensors in
the monitor with the cursor blinking at the first sensor
location. Press [Y/+] to select the highlighted sensor and
start the calibration. Or press [MODE] to move to the next
sensor location.
TOX1
VOC
Gamma
CO
VOC
LEL
pick?
OXY
LEL
OXY
Turn on the valve of the CO gas bottle to start gas flow.
Display shows “Apply CO Gas” and will wait for the
calibration gas to reach the sensor. Once the sensor
detects the gas, “Calibration in progress… 60” will appear
with the countdown timer showing the remaining seconds
as the monitor calibrates. When the countdown timer
reaches 0, the display shows the sensor name and the
calibrated value:
TOX1
VOC
Gamma
CO
cal’ed
reading = 50 ppm
LEL
OXY
If the sensor does not detect any gas after 60 seconds, “No
gas flow…” will display and calibration will be aborted.
NOTE:
The reading should be very close to the span gas
value. After a five-second pause, “Span Cal Done! Turn Off
Gas” will appear.
