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Quick Start Guide for the MultiRAE Plus
This document serves as a quick reference guide and is not intended to replace the
user manual. It is recommended to consult the user manual for more detail.
Geotechnics has relied on the information in the user manual to develop this guide
and makes no representation of warranty as to the accuracy of the guide.
1. About the MultiRAE Plus
The MultiRAE Plus is a 5-gas portable gas detector with a built-in pump which
allows sampling from potentially dangerous areas. This instrument measures
the standard conned space gases as well as volatile
organic compounds.
Gases measured:
• Oxygen (OXY)
• Carbon Monoxide (Tox1)
• Hydrogen Sulphide (Tox2)
• Methane (LEL)
• Volatile Organic Compounds (VOC)
2. Turning the MultiRAE Plus on
a. Make sure a water trap lter is installed, twist it clockwise to
install and lock it in place. Turn it counter-clockwise to remove
the lter.
b. The MultiRAE Plus has three buttons:
• Y/+
• N/-
• MODE
c. Press and hold down the ‘MODE’ button. Release when a ‘beep’
is heard. The unit will run through its warm-up sequence.
d. Allow the unit to warm up its sensors
3. Zero Gas/Fresh Air Calibration
a. Only perform a ‘Fresh Air Calibration’ in a clean, uncontaminated
atmosphere free from toxic or combustible gases
b. The display will prompt for a Fresh Air Calibration after its warm
up sequence. Press the Y/+ button to perform a
‘Fresh Air Calibration’.
Quick Start Guide for the MulitRAE Plus
Author: Jordan Widodo Version 1.0: 1/11/2017
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Quick Guide
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4. Measuring Mode Screen
a. The unit is ready to use when the home screen displays the
following:
• Tox1: 0
• Tox2: 0
• LEL: 0
• OXY: 20.9
• VOC: 0
b. Tox1 is CO (ppm), Tox2 is H2S (ppm), LEL is set to CH4 (%LEL),
OXY is in % and VOC in ppm.
5. Turning the MultiRAE Plus O
a. Press and hold the ‘MODE’ button to begin the shut-down timer.
b. Release the ‘MODE’ button when a long ‘beep’ is heard.
The unit has turned o.
6. Alarms
The MultiRAE Plus has audible and visual alarms set to trigger at specied
gas concentrations.
a. STEL is short-term exposure limit
b. TWA is time-weighted average
c. Tox1 is Carbon Monoxide (CO)
d. Tox2 is Hydrogen Sulphide (H2S)
e. VOC is Volatile Organic Compounds (VOC)
Sensor HIGH LOW STEL TWA
LEL % 20 10 - -
OXY % 23 19.5 - -
TOX1 ppm 200 35 75 35
TOX2 ppm 20 10 15 10
VOC ppm 100 50 25 10
Quick Start Guide for the MulitRAE Plus
Author: Jordan Widodo Version 1.0: 1/11/2017
Page 2 of 4
CONTACT US
0508 223 444
www.geotechnics.co.nz
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6.1 Testing the Alarms
a. On the ‘Home’ screen, press and hold the Y/+ button to
activate the audible and visual alarms.
b. Release the button to stop the test.
7. Tips
7.1 Pump/Flow Integrity Test
a. Place a nger over the inlet of the water trap lter.
The pump should stall, activating the alarm.
b. Remove your nger from the water trap lter and press
Y/+ button to reset the alarm and restart the pump.
7.2 Testing the VOC Sensor
a. Expose the writing tip of a felt-tip sharpie and hold close
to the water-trap lter inlet without touching it.
b. Observe the ‘VOC’ readings rise and fall.
c. Place the cap over the sharpie and the readings should fall.
Wait for the readings to stabilise at close to zero before use.
7.3 Testing the Oxygen Sensor
a. Exhale near the tip of the attached water trap lter. Keep
this going until ‘OXY’ registers 19.5% and the alarms are
activated.
b. Press the Y/- button to silence the alarm and wait for the
readings to return to 20.9% before using.
8. Calibration and Correction Factors
The MultiRAE Plus’s combustible and VOC sensors are calibrated to
Methane (50 %LEL) and Isobutylene (100 ppm) respectively. The VOC
sensor, however, is not selective to the calibration gas and will detect
other VOCs. Correction factors have been developed for this purpose
to obtain readings in the units of the compounds of interest.
Quick Start Guide for the MulitRAE Plus
Author: Jordan Widodo Version 1.0: 1/11/2017
Page 3 of 4
Quick Guide
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9. Troubleshooting
Symptom Possible Cause(s) Recommended Actions
1. Unit cannot turn on Flat/Defective
battery
1. Disconnect and re-connect
battery pack
2. Charge the lithium-ion
batteries
3. Use the alkaline battery pack
2. Abnormally high
readings after
turning on at ‘Home’
screen
Dirty water-trap lter
Incorrect calibration
gas
1. Replace water-trap lter
2. Dry the sensor module (silver cap
with black probe inlet)
3. Return to Geotechnics to
recalibrate
3. Alarms are activated
at ‘Home’ screen
Pump icon is ashing
or ‘Pump failed’
message is displayed
Pump ow failed/
blocked
1. Turn unit o
2. Replace water-trap lter, turn on
3. Check if inlet probe is blocked
4. ‘NEG’ ashing next
to VOC
Current atmosphere is
‘cleaner’ than fresh air
calibration for the VOC
sensor
1. Turn unit o & on again. Repeat
the fresh air calibration
5. Battery icon ashing Low battery 1. Charge battery or replace with
alkaline battery pack
6. ’Lamp’ ashing when
power on
PID lamp failure or low
ion concentration inside
lamp in cold environ-
ment
1. Turn unit o & on
2. Return to Geotechnics to rectify
7. Readings not
registering
Leak in the sample
train
Pump diaphragm
damaged
1. Check ow integrity
2. Return to Geotechnics to rectify
Quick Start Guide for the MulitRAE Plus
Author: Jordan Widodo Version 1.0: 1/11/2017
Page 4 of 4
CONTACT US
0508 223 444
www.geotechnics.co.nz
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