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Installation, Operation & Maintenance Manual
General 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 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. When the test button is released – the test sequence will terminate
and return to normal operation.
Service Reminders
A service screen will intermittently flash every 30 seconds after one year of operation.
The annual message reminder will begin after five (5) hours of continuous power irrespective of whether
the system is then, used intermittently. The detector will still operate as intended during this time.
Depending on the application and environmental factors, a service (bump test) can be conducted at a higher
frequency determined by the end user but must be executed by a competent person.
Bump Test (Gas Response Check)
What is a Bump Test?
Gas response checks are often referred to as a 'bump test'. Bump tests are important to make sure a device is able to
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. NFPA requires all gas detectors to be tested annually and that the test results be
recorded on site and available to inspectors.
Why is it important?
A detector may visually appear in good working order, but its sensitivity and accuracy can be inhibited by external
factors. Dust, humidity, temperature fluctuations, cleaning products, contaminants, exposure to its target gas or
sensor drift (ageing) can cause a decline in sensitivity, accuracy and eventual failure.
How often?
Regular bump tests are important to make sure the detector is able to detect a release of gas as early as possible and
usually takes seconds (gas type dependant i.e. CO sensors will take over a minute) and is often completed alongside
a scheduled fire alarm test, however the frequency should be determined following an appropriate risk assessment by
the end user.
IOM Iss: 4 11-21
Merlin Detector-TFT
11
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