Macurco OX-6 User Instructions page 22

7. Remove the gas from the sensor. Re-assemble the OX-6 (make sure the LED is aligned with the front case hole). 4-20 current
loop test is complete.
FIELD CALIBRATION PROCEDURE
Note: For optimum calibration results the unit must be in clean air and be in a low ambient air flow.
Calibrating the Sensor to Clean Air
1. Remove the Philips screw on the front of the OX-6. Pull the front cover of the unit off.
2. To select Calibration Mode (CAL) from normal mode, press the Next button three times to get to CAL or Calibration Mode.
3. Then press the Enter button to get to "SPn" - Calibration Span Mode. The unit will display the current oxygen reading (% v/v)
alternating with SPn (blinking) indicating calibration in progress (max 165 sec).
4. If the process is successful, the display will read 20.9 alternating with PAS (blinking) Calibration complete.
5. If the process was not successful the display will read the current oxygen reading (% v/v) alternating with FAL (Fail) (blinking)
Calibration Failed. If this occurs, repeat steps 2 through 4. If the sensor fails to calibrate twice contact Technical Assistance: 1-
877-367-7891.
6. To return to Normal Mode press Enter and then press Next until "20.9" or the current reading is displayed, or the unit will
simply time out to CAL then normal mode.
7. Re-assemble the OX-6 (make sure the LED is aligned with the front case hole). Calibration is complete.
8. See Calibration Flowchart on the inside of the housing.
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