Online Shop
Fishing Products Chandlery & Hardware Electronics & Navigation Dayboat Hire Electrical and Pumps Engines & Generators Marine TV and Audio Marine Clothing Galley, Heating & Cooling Boats & Trailers

Ask The Experts Open Day





Join us at Shepperton Marina on Saturday 19th May for super savings on many products throughout our chandlery and ask our industry experts all your questions. Dispose of your old flares with our free flare disposal. Get your lifejacket checked over ready for the summer at our RNLI Lifejacket Clinic. See all of the Lowrance and Simrad electronics in their demo trailer and on their demo boat. And much much more..


Garmin Approved Dealer




Lindon Lewis Marine are approved Garmin dealers view our extensive range of Garmin Chartplotters, Garmin Fishfinders & VHF Radios

Also available
Garmin GMR18 Radar Domes.


Yamaha Appointed Dealer




Lindon Lewis Marine are a Yamaha Appointed dealer for marine engines, spare parts and accessories. Click to view our range of Yamaha Outboards


Raymarine Approved Dealer




Lindon Lewis Marine are approved Raymarine® UK dealers view our comprehensive range of Raymarine Chartplotters, Digital Sounders and VHF Radios

Also available
Raymarine Radar, Radome products & packages.


Waeco compressor coolers




Excellent cooling performance regardless of the ambient temperature, versatile use, from the Coolmatic CR-50 to the CR-110 -view our


Volvo Penta Service Centre




Lindon Lewis Marine, an approved Volvo Penta® service centre click here for more infomation about our facilities at Shepperton Marina.



NASA Marine Gas Detector
NASA Marine Gas Detector
Part Number: SM523-MSD

NASA Marine Gas Monitor

Liquified petroleum gas (LPG) is an invaluable source of energy on many sailing vessels. It should, however, be used with great care. In its gaseous form it is heavier than air and will always collect at the lowest level in a vessel. Any leak of gas, any spillage of liquid could sink to the bilge and, unable to escape, build up to explosive proportions.

The Nasa gas detector system warns if the level of LPG rises above 10% of the lowest explosive limit (LEL) giving adequate warning of the need to ventilate the area before a dangerous situation occurs. The system consists of a cabin mounted monitor and a remote sensor. The monitor gives visual and audible warning if gas levels at the sensor rise above 10% LEL and will warn of fault conditions such as damaged cables etc. There is also an auxiliary output to drive external devices. (The auxiliary output is available on pin 5 of the DIN socket of the alarm unit. Connect the auxiliary load between the positive supply and pin 5. Note the maximum sink current on pin 5 is 100mA. If the auxiliary load is greater then 100mA use the output to switch a relay).

The splash proof sensor is supplied with a 5 metre cable and has a test button to check the system right through to the gas sense element. The sense element is user replaceable in the event of contamination.

Technical Specifications for the NASA Marine Gas Montior:
• Supply voltage 9 to 15 volts
• Low power consumption (typically 30mA)
• Fail safe system warns user of system faults
• Continuous performance monitor
• Spare low cost plug in catalytic sensor available
• External output to drive ancillary equipment
• Dimensions - W 134mm, H 70mm, D 28mm
• LEDs show system status continuously
• Two tone alarm activates when gas level reaches 10% of lower explosive limit

Price: £94.80 (Including VAT at 20%)


Quantity: