MSA TG5000, Operating Manual

Page: 54 / 75

54
Calibration
5.6 How to Zero Calibrate XCell Sensors
NOTICE
If a password is enabled, you will not be able to proceed with the calibration without the password.
To abort, press either button on the touchscreen or mobile application at any time during
the zero calibration.
In the event that a calibration cannot be completed, the user can acknowledge the FAIL
by placing one finger over each of the EZ touch buttons and holding for 1 second before
releasing. The unit will revert to the settings of the last successful calibration.
WARNING!
The regulator used with the zero gas cylinder should not be the same as the regulator used for
the span gas. The span gas regulator can be contaminated with the target gas over time, and thus
raise the detection baseline and make the sensor less sensitive to the target gas.
Failure to follow the above warning can result in serious personal injury or loss of life.
If there is no target gas in the atmosphere around the sensor, using a zero gas cylinder
is optional.
To Zero calibrate the sensor,
(1) Attach the Sensor Guard to the bottom of the sensor.
(2) Place the green Calibration Cap over the Sensor Guard inlet so that it is flush with the bottom
of the Sensor Guard and completely covers the Sensor Guard inlet.
(3) Attach the tubing to the plastic stem protruding through the green Calibration Cap.
(4) Screw the regulator onto the top of the zero gas cylinder.
If a password is enabled, you will need to enter it here.
(5) Scroll and select Calibration.
(6) Scroll and select
Zero Calibration
.
(7) Once the screen displays Zero Soaking, turn on zero gas flow by turning knob on the regu-
lator.
(8) Wait while the device displays the countdown of the Zero Calibration.
(9) Once the zero calibration is complete, a Zero PASS or FAIL is displayed.
If PASS displays, the procedure is complete. User may record the as found and as left values
as an indication of the amount of sensor correction performed during the calibration.
If FAIL displays, the procedure was unsuccessful.
(10) Remove the Calibration Cap.
Sensors with TruCal and have Diffusion Supervision enabled can go into Diffusion
Supervision Fault if the green Calibration Cap is left on after completing a zero calibration.
WARNING!
The green Calibration Cap must be removed from the sensor after a zero calibration. Failure to
do so could restrict gas flow to the sensor and result in erroneously low readings.
Failure to follow the above warning can result in serious personal injury or loss of life.
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