Installation, Operation & Maintenance Manual Merlin Detector i-S
Iss: 1 170322
9
Alarm Set Points
An audible buzzer will sound if the buzzer switch on the circuit board is on!
CO
2
alarm levels stated are factory set condition only!
Target Gas
Pre-Alarm
Buzzer
Alarm
Buzzer
Methane/Natural Gas (NG)
▲
8% LEL
No Sound
▲
10% LEL
Continuous
sound
Liquid Petroleum Gas (LPG)
▲
8% LEL
▲
10% LEL
Hydrogen Gas (H
2
)
▲
8% LEL
▲
10% LEL
Oxygen (O
2
)
▼
19.5%
▼
18.5% or
▲
23%
Carbon Monoxide (CO)
▲
20 ppm
▲
20ppm after two (2) hours
▲
50ppm
after
One (1) hour
▲
100ppm
after
Ten (10) minutes
▲
300ppm after One (1) minute
*Carbon Dioxide (CO
2
)
▲
800 ppm
▲
1000 ppm
3 beeps every
10 seconds
▲
Rising alarm
▼
Falling alarm
(LEL) Lower Explosive Limit (PPM) Parts Per Million
* CO
2
alarm levels stated are factory set condition only.
Maintenance
Cleaning
Concentrations of alcohol found in many products may damage, deteriorate or affect the gas sensing elements such as;
wine; deodorants; stain removers and thinners. Other gases and substances to avoid are corrosives (i.e., chlorine &
hydrogen chloride); alkali metals; basic or acidic compounds; silicones; tetraethyl lead; halogens and halogenated
compounds!
Keep your gas detector in good working order - follow these basic principles.
•
Remove any dust/debris from the outer enclosure regularly using a slightly damp cloth.
•
Never use detergents or solvents to clean your device.
•
Never spray air fresheners, hair spray, paint or other aerosols near the device.
•
Never paint the device. Paint will seal vents and interfere with the device.
Manual Circuit Simulation Test
Access to the interior of the detector, when carrying out any work, must be conducted by a competent person!
This circuit test does not check the gas-sensing element itself!
When the test button on the circuit board is pressed and held for ~3seconds the detector will simulate an open circuit
to ensure configured systems, outputs, alarms, indications, and other external devices operate as intended in
response to gas. The test sequence will automatically terminate after a short period of time and return to normal
operation.
Bump Test (Gas Response Check)
What is a Bump Test?
Gas r
esponse checks are often referred to as a ‘
bump test
’. Bump tests are important to make sure a device
can
detect a release of gas as early as possible. The aim of the bump test is to make sure a detector is working at its
optimum by briefly exposing the unit to a known concentration of the target gas that usually exceeds the highest
alarm point. If the detector goes into alarm and all signals/outputs activate, then the system is working safely.
If the system fails to operate as intended in an alarm state, the gas detector must not be used until a full inspection
and service has been conducted.
