Duomo HHGAS User manual

Operation
When battery supply is low, the low battery indicator
will show (Fig.2).Change the batteries.
NOTE: To ensure accuracy, perform the warm-up in
clean air.
Press button 1 (Fig. 1) to turn
the meter on and off.
After a 60 second warm-up the
meter is ready to use and the
Ready L.E.D. (Fig. 2) will light up.
The unit will turn off
automatically after 10 minutes
of inactivity. Keypad (Fig. 1)
Gas Leak Detector (HHGAS)
1
1
1
Detects methane and propane gases
Quick to pinpoint gas leaks
Automatically calibrates at power-on
Less than 60 second warm-up time
Auto power off function
Response time of less than 10 seconds
5-level L.E.D. alarm
Over 440mm long flexible probe
Built-in earphone jack
Mute function
Carefully read the following
instructions prior to
installation of this device.
Always keep this pamphlet
for future reference.
i
Display & Connections
Normal Operation (Fig.2)
A= Gas level in ppm
B= Ready LED
C= Battery level
Side Panel (Fig. 3)
A= Mute button
B= Headphone jack
C= 9V DC adaptor
B
B
A
A
C
C
B
A
C
CA B
w: www.duomo.co.uk - e: [e-mail] - t: 01905 797989 - f: 01905 774296 | ©Duomo (UK) Ltd. 2007

Troubleshooting
Notices Specification
Meter does not turn on
Press and hold button 1 for more than 0.2 seconds.
Check whether batteries are in good contact and
correct polarity is observed. Replace batteries and
try again.
Ready LED is not on after 60 second warm-up
Check that the probe is in good contact with the
rest of the unit. If LED is still off, please return the
meter to the dealer for repair.
Methane
Range of 40 - 640ppm
Propane
Range of 35 to 580ppm
Sensitivity of 35ppm
Warm Up
60 seconds
Operating Ranges
From -5 ºC~45ºC
Probe Length
447mm
Response Time
10 seconds
Power
4 pcs AA batteries,9V DC adaptor (not supplied)
Battery Life
14 hours (continuous working)
Power-off
10 minutes from power-on
Situations which must be avoided
- Environments where the sensor may come into
contact with silicone vapour
- High exposure to corrosive materials (e.g. H2S, SOx,
CL2, HCl etc.) which can corrode or break the lead
wires or heater material
- Exposure to alkaline metals, especially salt water
spray
- Excessive exposure to water
- Exposure to extreme low temperatures where
freezing could occur
- Areas with a zero or low oxygen atmosphere.Unit
operates most effectively at around 21% ambient
oxygen environment
Situations to be avoided whenever possible
- Exposure to excessive levels of condensation
which can effect the sensor
- Long exposure to high density gas
- If storing the unit for a lengthy period of time, seal
in a bag with clean air.
(NOTE: If the unit is not used for a significant
period of time,it will require a longer warm-up
time.To avoid this, power-on the unit periodically)
- Avoid exposure to conditions of extreme humidity,
temperature or contamination levels as these will
affect sensor performance
Use
Turn the meter on and wait for the warm-up to
complete. Once it has done, the Ready LED (Fig. 2) will
light up and the unit is ready to use.
NOTE: If the unit it switched off, even for a short period
of time, it will need to perform the warm-up routine
again.
As long as the meter is functioning correctly and battery
power is sufficient,the Battery OK LED will also be lit.
The meter will beep once every second to assure that it
is in normal working status. The frequency of the beeps
will increase as detected gas concentration gets higher.
Beeps will be muted if a set of headphones are attached
or the Mute button on the side of the unit is selected
(Fig. 3).
To check pipe leakage, move the sensor towards the
pipe and slide it along the length. Repeat this procedure
for the other side of the pipe. If the sensor detects a leak,
one of the gas level LED's will light up and the frequency
of the beeps will increase.
w: www.duomo.co.uk - e: [e-mail] - t: 01905 797989 - f: 01905 774296 | ©Duomo (UK) Ltd. 2007