Amprobe IR-750 Infrared-Thermometer - Manual (Page 23)

18
Testing Belts and Sheaves
1. Press SET and then press / to select relatively high emissivity.
2. Press SELECT to select MAX.
3. Enable the motor and allow it to reach a steady state operating
temperatures.
4. Aim the Thermometer at the surface to be measured.
5. Start recording temperature.
6. Slowly move the Thermometer up the belt toward second sheave.
• If belt is slipping, sheave temperature will be high from friction.
• If belt is slipping, belt temperature will remain high between sheaves.
• If belt is not slipping, belt temperature will reduce between sheaves.
• If inner surfaces of sheaves are not a true “V” shape, this indicates
belt slippage and will continue to operate at elevated temperatures
until sheave is replaced.
• Sheaves must be properly aligned (include “pitch & yaw”) for belt
and sheaves to operate at appropriate temperatures. A straight edge
or taut string, can be used to check alignments.
• Motor sheave should operate at a temperature consistent with
blower sheaves.
• If motor sheave is at a higher temperature at motor shaft than at
outer circumference, belt is probably not slipping.
• If outer circumference of sheave is at higher temperature than sheave at
motor shaft, then belt is probably slipping and sheaves may be misaligned.
Checking Hydronic Radiant Heat Applications
1. Press SET and then press / to select relatively high emissivity.
2. Press YELLOW button to select MAX.
3. To locate radiant heat tubes in floor, temporarily elevate the loop
temperature to create hotter spots for identifying tubing runs.
4. Before releasing trigger, press YELLOW button to toggle between MIN,
MAX, DIF floor temperatures and record the temperature for future
comparison and trending under similar conditions.