LPG Gas Detector with Exterior Sensor. BEP 600-GD.

LPG detector features:

A test mode checks operation of sensors with indicators for fault detection.
Self testing capability
Microprocessor control  
Provision for external alarm
Provision for bilge blower
Dual sensor capability
One sensor supplied - with a 5m cable

Technical specs:

Power supply: 10-32V
Alarm sensitivity: 20% LEL (Lower explosive limit)
Current draw with 2 sensors: 350mA (max)

Notes:
For LPG and petrol fumes which are heavier than air, mount the sensor in a low dry position where the gas is likely to sit. Sensor must be mounted clear of bilge water.
For CNG gas, which is lighter than air, mount the sensor just below ceiling height but not above cooking or heating areas.