A probe is placed within the flow of exhaust air to receive the best gauge of how hot the engine fumes are becoming. Should give you a high low calibration.
Gauge Pyrometer O Reilly Auto Parts
How to test a pyrometer gauge. Check wires on studs to make sure wire colors match labels on studs. With a bbq gas lighter heat the probe end being careful not to burn yourself. Normal operating ranges are from 300 degrees to 1200 degrees. Do the same with some ice. A pyrometer measures the temperature of the engine through its exhaust fumes. Within a minute the gauge should rise and the temperature on the gauge.
The short version is this. If you want to blow the pictures up it may be usefull sometime. On a work bench away from the vehicle connect the gauge up to a 12 volt source 2. A somewhat accurate method of calibration with a thermocouple involves simply measuring the temperature of an object with a trusted thermocouple then measuring it with the pyrometer. Attach the temperature sensor probe to the gauge. With power off disconnect the four wire connector from wire harness that goes to amplifier box 2.
Try using a 100w light bulb with the probe against it and wrap it with some fiberglass insulation that should get plenty hot. Check gauge resistance 1. The tool can then be adjusted to reflect the accurate measurement provided by the thermocouple. If the pyrometer is slow or erratic check the leadwires and thermocouple for continuity and check the leadwires for resistance 023 ohms per foot. Any fluctuations from this range can damage the engine. Found an isspro installation sheet in the box with a new gauge my father has.
If you have a heat source with a known temperature you could test the probe and hook up a millivolt meter to see if its the probe or gauge. Bring some water to boil and check the temp with another therm and then check the temp with your pyro.
Gallery of How To Test A Pyrometer Gauge
