Installation & Operation Manual Merlin GDP2X
GDP2X - IOM Iss: 7 03-21
12
What do I need?
Contact your S&S Northern representative for details of suitable bump testing kits and gases. Kits usually consist of a
certified gas cylinder; flow control regulator, tube pipe and applicator cone. We recommend only using S&S Northern
calibration gas kits to ensure correct flow rates meet S&S Northern technical requirements. A bump testing gas is
usually a concentration mix that exceeds the highest alarm set-point.
See below for recommended gas concentrations for bump testing your detector.
Detector Type
Bump Test Gas
Response Time
CO - Carbon Monoxide
400 - 500ppm (balance in air).
<120s
NG - Methane
0.6 - 0.8% BV (balance in air)
<30s
LPG - Liquid Petroleum Gas
0.3 – 0.4% BV (balance in air)
<30s
H - Hydrogen
5000 - 6000ppm (balance in air)
<30s
O
2
- Oxygen
15% (balance in Nitrogen).
<60s
All certified test gases supplied by S&S Northern are classified as non-flammable and non-toxic, however, they do
contain gas under pressure and may explode if heated to extreme temperatures and cause asphyxiation in high
concentrations.
How to perform a Bump Test?
1. Ensure you have the correct gas for the device type prior to application.
2. Screw and seal the regulator/valve into the gas cylinder outlet.
3. Once sealed, the regulator pressure gauge will indicate cylinder pressure.
4. Offer up the applicator hose/cone to the lower vents.
5. Open the valve/regulator to allow the gas to be delivered at a pre-set flow rate.
7. Wait for the device to enter alarm status and energise configured outputs/relays.
At this point…
9. Remove applicator hose/ cone and turn the gas cylinder regulator/valve off.
10. Wait for the device to return to normal.
11. Reset the system.
Record your test details. There is a provision for this in your control panel manual.
To increase reaction time, cover the escape vents at the top of the device.
Alternatively, enclose the device and apply gas i.e. in an air tight bag or container.
For more help and advice on bump testing – contact us.
Access to the interior of the detector, when carrying out any work, must be conducted by a competent person!
This test does not check the gas sensing element itself!
Always remove the regulator/valve from cylinder after use!
Always check cylinder pressure upon sealing valve – there may not be a sufficient amount of gas!
All S&S Northern cylinders will re-seal upon removal of the regulator/valve!
Always give at least five (5) minutes between testing the same unit or until gas has fully dispersed!
Always consider safety and use equipment in accordance with Safety Data Sheets!
