Operations; Operational Hints; Heartbeat Indicator; Alarms - General - MSA ORION Manual

24
3.4

Operations

3.4.1

Operational hints

After the challenge test, calibration, and clearing peaks, TWA and STEL, the Orion
returns to instant reading mode.
Always wait for the display to stabilise before taking readings. This can take up to
45 seconds.
Keep the probe tip above liquid surfaces.
If you're comparing readings over time, make sure you always take subsequent
readings at exactly the same location as the first reading.
The oxygen concentration shown by the Orion can be used as an indication of other
contaminants. The O
between clean ambient air and the atmosphere being monitored, it is usually caused
by one of the following:
• The O
• The O
confined space such as a sewer.
• The O
Therefore any unexplained drop in oxygen concentration must be investigated. If in
any doubt contact the Hazardous Materials Response Unit (HMRU) or Science
Advisor.
Use the
3.4.2

Heartbeat indicator

Once switched on, every thirty seconds, the Orion:
• beeps
• heartbeat flag flashes.
This indicates to the operator that the unit is switched on and functioning.
3.4.3 Alarms – general
When the Orion goes into alarm:
• the red alarm lights flash
• an 85 dB alarm is issued
• the relevant flag displays, such as the Pump flag showing or the TWA, STEL,
%O
Acknowledge the alarm by pressing the Change/Reset button.
D.I. Recommended Practice
FILE: W:\NB\RP HMRU\Orion\Frame Ver 02\Orion.fm
reading is normally about 20.5 to 21%. If the O
2
has been consumed by fire.
2
has been consumed by a chemical or biochemical reaction. Eg, in a
2
has been displaced by another contaminant.
2
CAUTION
Always leave the rubber boot fitted. This helps protect the Orion
from impact.
Detector Use Record
, %LEL, or battery flag flashing.
2
if required by the IC.
Version 02 Issued February 2011
© Copyright State of NSW (Fire and Rescue NSW) 2011
Four-Head Gas Detector: MSA Orion
level drops
2