Digi-Sense 35625-15 Instruction Manual
Stick-Style Water-Resistant
Infrared Thermometer
for Foodservice Applications
with 4:1 Distance-to-Sight Ratio
Model 35625-15
THE STANDARD IN PRECISION MEASUREMENT
1
Introduction
The Digi-Sense Stick-Style Infrared Thermometer (Model
35625-15) with 4 to 1 distance-to-sight ratio offers fast
response and high accuracy at the touch of a button. The
built-in laser pointer increases target accuracy while the
convenient push button and backlight LCD combine for
ergonomic handheld operation. Unit features a dust- and
water-resistant IP54 rating. Infrared thermometers can be
used to safely measure the temperature of objects that are
hard or improper to be measured by traditional contact
thermometers. Careful use of this meter will provide years
of reliable service.
Unpacking
Check individual parts against the list of items below. If
anything is missing or damaged, please contact your
instrument supplier immediately.
1. Meter
2. One 9 V battery
3. User manual
2
Key Features
• 4:1 Distance-to-sight ratio
• 2% basic accuracy
• Precise noncontact IR measurements
• Laser sighting
• Fixed emissivity (0.97)
• User-selectable °F or °C temperature units
• Automatic data Hold
• Backlight LCD
• Automatic power-off to conserve battery life
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Meter Description
1. Laser pointer beam
2. IR sensor
3. LCD
4. MEASURE button
5. Battery cover
6. °F/°C switch
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2
3
4
5
6
4
Display Layout
1. Emissivity value
2. Laser pointer indicator
3. Data HOLD icon
4. Low-battery indicator
5. °F and °C temperature icons
6. Temperature readout
1 2 3
6
4
5
5
How it Works
Infrared thermometers measure the surface temperature of an object. The unit’s optics sense emitted,
reflected, and transmitted energy, which is collected
and focused onto a detector. The unit’s electronics
translate the information into a temperature reading
which is displayed on the unit. The laser is used for
aiming purposes only.
Field of View
Make sure that the target is larger than the unit’s
spot size. The smaller the target, the closer you
should be to it. When accuracy is critical, make sure
the target is at least twice as large as the spot size.
Distance and Spot Size
As the distance (D) from the object increases, the
spot size (S) of the area measured by the unit
becomes larger.
Locating a Hot Spot
To find a hot spot, aim the thermometer outside
the area of interest, then scan across with an
up-and-down motion until you the locate the hot
spot.
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Emissivity
Emissivity is a term used to describe the energy-
emitting characteristics of materials. Most (90% of
typical applications) organic materials and painted
or oxidized surfaces have an emissivity of 0.95.
Inaccurate readings will result from measuring shiny
or polished metal surfaces. To compensate, cover
the surface to be measured with black tape or flat
black paint. Allow time for the tape to reach the
same temperature as the material underneath it.
Measure the temperature of the tape or painted
surface. (Refer to table below.)
Substance
Asphalt 0.90 to 0.98 Cloth (black) 0.98
Concrete 0.94 Human skin 0.98
Cement 0.96 Lather 0.75 to 0.80
Sand 0.90
Earth 0.92 to 0.96 Lacquer 0.80 to 0.95
Water 0.92 to 0.96 Lacquer (matte) 0.97
Ice 0.96 to 0.98 Rubber (black) 0.94
Snow 0.83 Plastic 0.85 to 0.95
Glass 0.90 to 0.95 Timber 0.90
Ceramic 0.90 to 0.94 Paper 0.70 to 0.94
Marble 0.94 Chromium oxides 0.81
Plaster 0.80 to 0.90 Copper oxides 0.78
Mortar 0.89 to 0.91 Iron oxides 0.78 to 0.82
Brick 0.93 to 0.96 Textiles 0.90
Thermal
emissivity
Substance
Charcoal
(powder)
Thermal
emissivity
0.96
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How it Works (continued)
Good Measuring Practices
Holding the meter by its handle, point the IR sensor
toward the object whose temperature is to be
measured. The meter automatically compensates for
temperature deviations from ambient temperature.
Keep in mind that it will take up to 30 minutes for
the IR sensor to stabilize if going from ambient
temperatures to a much higher (or lower)
temperature measurement.
Reminders
• The unit is not recommended for measuring
shiny or polished metal surfaces (stainless steel,
aluminum, etc.). See Emissivity on page 7.
• The unit cannot measure through transparent
surfaces such as glass. It will measure the
surface temperature of the glass instead.
• Steam, dust, smoke, etc. can prevent accurate
measurement by obstructing the unit’s optics.
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