Zero The Orion - MSA ORION Manual

Four-Head Gas Detector: MSA Orion
3.3.3

Zero the Orion

Zero the Orion:
• at start-up
• as required during operations.
To zero at start-up:
a) Turn on the Orion in known clean air, away from truck exhausts, etc.
b) The Orion will go through warm-up. Then for 10 seconds the Zero flag flashes,
offering the option of zeroing.
c) Ensure readings are stable, with %LEL, CO and H
reading 20.8%. If initial Orion readings do not match these values, you may not
be in clean air. Do not zero the Orion. Investigate.
If clean air is confirmed, but the Orion still shows readings, proceed to field
calibration. (See
d) To accept zeroing, press On/Off/Page. (If you don't accept zeroing, the Orion
goes into instant reading mode.)
e) The Zero flag stays on. The Orion automatically sets the zero point for the
sensors. (The oxygen sensor is spanned and calibrated at this point.)
f) When zeroing is complete, the Zero flag disappears. The Orion enters instant
reading mode.
To zero during operations:
a) Push and hold Change/Reset until the Cal flag comes on and the Zero flag
flashes.
b) Press On/Off/Page to accept zeroing.
c) The Zero flag stops flashing while the Orion is zeroed.
d) When zeroing is complete, the Zero flag disappears and the Cal flag flashes.
To return to instant reading mode, press Change/Reset, or wait 45 seconds. To
continue with calibration, press On/Off/Page.
D.I. Rec-ommended Practice
FILE: W:\NB\RP HMRU\Orion\Frame Ver 02\Orion.fm
WARNING
Zero the Orion in clean air only. If the Orion shows contaminants are
present, DO NOT zero the instrument. Investigate.
Section 3.3.5: 'Field calibration' on page
S reading zero, and O
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Version 02 Issued February 2011
© Copyright State of NSW (Fire and Rescue NSW) 2011
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