7
Testing Fuses and Bus Connectors
•
Press SET and then press
▲
/
▼
to set emissivity to relatively high for paper covered
fuse body or insulated connections.
•
Press MODE to select MAX.
•
Scan the paper covered length of fuse.
•
Without releasing the trigger, scan each fuse. Unequal temperatures between fuses
may indicate voltage or amperage imbalance.
•
Press SET and then press
▲
/
▼
to set emissivity to relatively low, for metal fuses
and caps and insulated bus connections.
Testing Electrical Connections
•
Press SET and then press
▲
/
▼
to set emissivity to relatively low for uninsulated
connectors or bus connections or relatively high for insulated connections.
•
Scan the conductor, moving toward direction of electrical connector.
Note:
conductors are typically smaller than the Thermometers spot size. If the spot size
is bigger than the connector the reading is the average within the spot.
Scanning walls for air leaks or insulation deficiencies
•
Turn off heating, cooling, and blower.
•
Press SET to select emissivity. Use
▲
/
▼
to select emissivity relatively high for
painted surfaces or window surfaces.
•
Measure an interior partition wall surface temperature. Do not release the trigger.
•
Record this temperature as your baseline (or benchmark) for a “perfectly” insulated
wall.
•
Face the wall to be scanned. Stand 1.5m away to scan a 5cm spot on the wall.
Scan horizontal rows of wall from top to bottom, or horizontal rows of ceiling from
wall to wall.
Look for greatest deviations from baseline temperature to identify problems.
•
This completes the insulation test scan.
Checking Hydronic radiant heat applications
•
Radiant heat tubes in the floor will normally run parallel to the outside walls.
Starting at the floor wall juncture, scan parallel to the wall while moving into
the room away from the wall. Parallel to the outside wall you should find
parallel isothermal rows indicating the location of heat tubes below the surface.
Perpendicular to the outside wall, you should find rising and falling temperatures at
equal distances. High temperatures indicate you are scanning a heat tube beneath
the floor surface, low falling temperatures indicate a space between the heat tubes.
Measuring Grille or Diffuser Discharge Temperature
•
Press SET and then press / to select relatively high emissivity.
•
Aim the Thermometer at the discharge air grille, register, or diffuser.
•
Measure discharge temperature.
•
Release trigger to freeze the temperature reading for 8 seconds and record this
temperature. Grille, register, or diffuser temperature should be equivalent to
discharge temperature at the air handler.
Testing Enclosed Relays
•
Press SET and then press
▲
/
▼
to set emissivity to relatively low for uninsulated
connectors or relatively high for plastic encased relays or for bakelite enclosed
relays or insulated connectors.
•
Press MODE to select MAX. Start to scan.
•
Measure the relay casing, looking for hot spots.
Содержание 72-8732
Страница 1: ...1 Model 72 8732 Infrared Thermometer ...
