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TXP-WTA_Instruction_Manual_(Rev1.3)
Use the following step-by-step procedure to perform ZERO and SPAN calibrations.
NOTE: During TXP-WTA Sensor Transmitter calibrations, alarms are inhibited and "CAL MODE" is displayed on the
controller.
A gas reading is usually considered "STABLE" when there is no change in the reading for minimum of 30 seconds.
1. To enter the CAL MODE from normal operation, swipe the CAL / DOWN key and within 5 seconds swipe the
EDIT key.
2. Using the Cal-Cup (80-8000-0000-03) apply a clean ZERO gas or be sure there is no background target gas in
the monitored area. After the reading is stable swipe the EDIT key to perform a ZERO calibration.
3. If the ZERO calibration is successful, the sensor automatically enters Span Cal Mode.
4. Apply the correct SPAN gas at .5 liters/min. After the reading is stable swipe the EDIT key to perform a SPAN
calibration.
WARNING: THE SPAN GAS USED MUST MATCH THE VALUE SPECIFICED SINCE THIS IS WHAT THE SENSOR
TRANSMITTER WILL INDICATE AFTER A SUCCESSFUL SPAN CALIBRATION THE CAL SPAN VALUE MUST BE EDITED
IF IT BECOMES NECESSARY TO APPLY A DIFFERENT GAS CONCENTRATION (SEE SECTION 7.2.6).
5. If the SPAN calibration is successful, the display flashes "REMOVE CAL GAS" and starts the CAL PURGE delay
(see Section 8.2.2).
NOTE: During CAL PURGE, toxic TXP-WTA Sensor Transmitters transmit a 0% of Full Scale (No Gas) reading to
the TXP-WCR Controller to prevent alarms by residual upscale SPAN values. Oxygen TXP-WTA Sensor
Transmitters transmit a 20.9% oxygen reading during CAL PURGE to avoid tripping low oxygen alarms. These
levels are transmitted until the WTA finishes CAL PURGE.
6. CAL MODE is complete after the end of the CAL PURGE delay.
The flow chart in Figure 5 3 illustrates the above procedure from left to right.
UP, CAL, NEXT & EDIT labels indicate keystrokes using the magnetic wand.
•
•
The CAL MODE information screen (top of the chart) is available for advanced users to see Offset / Gain
calibration constants and live analog to digital converter (A/D) counts. Span Gas calibration values may also
be edited from this screen.
•
Holding the UP key, for 6 seconds during CAL MODE, displays this screen.
NOTE: The sensor life is displayed on the last screen view before returning to the home screen.
REV – 1.3
[34-2900-0207-4 ]
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