nVision Tire Pressure Monitoring System
nVision Tire Pressure Monitoring System . Click image to enlarge

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Review and photos by Frank Rizzuti

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nVision Tire Pressure Monitoring System

Starting with model year 2007, tire pressure monitoring systems (TPMS) became mandatory in every new passenger vehicle with a GVWR of 10,000 lbs (4,535 kg) or less, sold in the United States. Here in Canada TPMS isn’t mandatory yet, but vehicle manufacturers are building them into their vehicles anyway, as standard or in some cases optional equipment.

There are two types of TPMS: indirect and direct. The indirect system uses information from the ABS sensors to compare turning circumference of each tire to the other three. This is the style that was used when TPMS was first introduced. I had a 1999 GM vehicle which used this system and it constantly gave false readings and wouldn’t activate until 30 per cent below the normal pressures. For these reasons, the indirect system has been replaced with the more accurate direct system.

The direct system uses sensors fitted inside the tire where it reads the air pressure directly, and it will activate at 25 per cent below normal pressures. These sensors feed information to either a general warning light or on more sophisticated systems will indicate which tire needs attention.

If your vehicle is older than 2007 and you would like the benefit and safety associated with TPMS, you can add a portable system such as nVision.

nVision Tire Pressure Monitoring System
nVision Tire Pressure Monitoring System . Click image to enlarge

nVision, by Hopkins Manufacturing, markets a portable, wireless, system that can be used on any vehicle. It can monitor up to 24 tires simultaneously, will give warnings at 12.5 per cent (poor fuel economy warning) and at 25 per cent (dangerous low pressure warning) below normal. This is a great system to add if you’re towing a trailer. Monitoring tire pressures on a large trailer can prevent a very dangerous tire blow out.

Supplied in the box is the monitor with antenna, power cord and four sensors (additional sensors can be purchased separately). The sensors replace the tire valve caps and send a Radio Frequency signal to the monitor. You can set up to four different combinations of vehicles, motorhomes and trailers. This allows motorhome owners to track their coach and towed vehicle while in transit. Same for truck owners: track your truck and trailer tires simultaneously.

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