Autocalibration Failure - MSA Orion Operation Manual

Chapter 5, Calibration
4. Connect the appropriate calibration gas to the instrument.
5. a. For Diffusion Instruments (FIGURE 5-4):
Attach the calibration cap to the instrument.
1) Connect one end of the tubing to the calibration cap.
2) Connect other end of tubing to the cylinder regulator
(supplied in the calibration kit).
b. For Pumped Instruments (FIGURE 5-5):
1) Connect one end of tubing to instrument inlet fitting.
2) Connect other end of tubing to the cylinder regulator
(supplied in the calibration kit).
6. Open the valve on the regulator.
7. Push the ON-OFF/PAGE button to calibrate (span) the instrument.
• CAL flag stops flashing and remains ON.
• Instrument cycles through the gases one-at-a-time for
approximately 90 seconds.
• If autocalibration sequence passes, the instrument
returns to the Measure mode.
NOTE: To skip calibration and return to the Measure mode,
push the CHANGE/RESET button.
If no button is pushed for 10 seconds, the instrument
returns to the Measure mode.
8. Remove the calibration cap or tubing from the pump inlet.
9. Close the valve on the regulator.
NOTE: The autocalibration procedure adjusts the span
value for any sensor that passes the test;
sensors that fail autocalibration are left unchanged.
NOTE: Since residual gas may be present, the instrument
may briefly go into an exposure alarm after the
calibration sequence is completed.

Autocalibration Failure

If the Orion Multigas Detector cannot calibrate one or more
sensor(s), the instrument goes into the Autocalibration Failure
Page and remains in alarm until the CHANGE/RESET button is
pushed. Sensors that could not be calibrated are indicated by
dashed lines on the concentration display.
5-4
Operating Manual