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561 HVACPro
Users Manual
10
Table 3 lists recommended Fluke temperature probes for use with the Thermometer:
Table 3. Recommended Temperature Probes
Probe Usage
80PK-25
The piercing probe is the most versatile option. Good for checking air temperature in
ducts, surface temperature under carpets/pads, liquids, thermometer wells, vent
temperatures, and for penetrating pipe insulation.
80PK-1
The general purpose bead probe is an alternative, for quick, accurate surface
temperatures and air temperatures within ducts, vent temperatures.
80PK-8
Pipe clamp probes (2) are essential for tracking continuously changing temperature
differentials on hydronic tubing and pipe loops, and good for quick, accurate
refrigerant temperatures.
80PK-26
The tapered probe is a good general-purpose gas and surface probe, with a good
length and low mass tip casing for faster reaction to surface and air temperatures.
80PK-9
The insulation piercing probe provides a sharp tip to pierce pipe insulation and flat
probe tip for good surface thermal contact, air temperatures within ducts, and vent
temperatures.
HOLD
The display will remain activated for 7 seconds after the trigger is released. HOLD appears in the upper
middle of the display. When the trigger is pulled again, the Thermometer will begin measuring in the last
function selected.
Typical Measurements
This section describes a variety of measurements often performed by HVAC technicians. The backlight and
laser are on whenever you are making readings with the Thermometer.
Measuring Heating/Cooling Duct Insulation Jacket Temperature
1. Press D and then press A to select an emissivity setting.
• HI emissivity for vinyl or PVC jacketed insulation
• LO emissivity for foil faced insulation
Note
Alternately, place black electrical tape on jacket surface. Scan to compare tape and insulation
jacket temperatures. Adjust emissivity so insulation jacket temperature is closest to tape
temperature.
2. Connect the thermocouple probe. The probe hangs in the air to measure ambient air temperature in
order to compare the temperature differential. Temperature deviation between the insulation jacket
and ambient air temperature indicates leaky or ineffective insulation.
3. Scan the insulation jacket temperature.
Measuring Dewpoint Temperature
The temperature of the duct insulation jacket at any single point is a critical temperature. If jacket
temperature reaches dewpoint temperature, condensation will form.