Gadgets & Gear
Noncontact Thermometers
By Bill Siuru
As noncontact thermometers can measure temps without physical contact, they can be used in hard–to–reach locations or where moving parts could be a hazard. Not having to touch the object eliminates the burns and shocks, as well as interference with the component's operation. Here are some examples where the thermometers can be used. You will discover many more.
Engines: Isolate a misfiring cylinder by comparing exhaust manifold temps for all cylinders. Lower temps indicate poor combustion or a misfire. Take readings on a cold engine before heat is distributed uniformly over the entire manifold. Unequal temps can also indicate low compression in a cylinder or cylinders. Measure temps at both sides of catalytic converters. A significant difference can indicate a clogged converter.
Cooling Systems: Scan the entire front and back of the radiator core. Abrupt temperature differences indicate a plugged radiator core, obstructing coolant flow. Measure inlet and outlet heater hose temps. A large difference indicates a restricted heater core. Some thermostats can be checked on the engine. When the thermostat opens, the temp drops drastically. Compare the temp when it opens to the specifications. Make measurements at the radiator inlet or thermostat outlet, since hose temps can be lower than coolant temps.
Brakes: Measure the drum or rotor temps immediately after the vehicle has been braked in a straight line. Significant right/left bias temps indicate uneven braking caused by sticking pistons, adjusters, or calipers, etc.
Bearings: Compare left and right axle wheel bearing temps. They should be about the same, unless one is bad. Excessive temps at bearing locations in motors, alternators, compressors, etc., can also mean a bad bearing. Excessively hot driveshafts, transmissions, differentials, etc., can indicate problems.
Electrical Systems: Locate high resistance in electrical connections by measuring the temps of electrical connectors. Higher–than–normal temps indicate excessive resistance, a worn fuse link, poor fuse connection or a short circuit.
Around the RV and house: Use a noncontact thermometer to check the accuracy of thermostats by comparing settings with actual room temps. Locate heating and cooling leaks from poor insulation or door and window seals. Assure that refrigerators are keeping food at safe temps. Check the oven and air conditioner temps for accuracy of controls. Use the noncontact thermometer to check the temp of your barbecue when grilling ribs and steaks. I even use mine to check temps before venturing outdoors. You can do this simply by opening a window and pointing at something that is not heated by sunlight.
For More Information
Raytek Corp.
1201 Shaffer Road
Santa Cruz, CA 95061–1820
(800) 227–8074
www.raytek.com
OMEGA Engineering Inc.
One Omega Drive
Stamford, CT 06907–0047
(800) 848–4286
www.omega.com
Extech Instruments Corp.
285 Bear Hill Road
Waltham, MA 02451
(781) 890–7440
www.extech.com
This article courtesy of Camperways
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