Digi-Sense 35625-15, 35625-16 User 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

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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

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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

1

2

3

4

5

6

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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

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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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Setup and Operation

1. To select the desired temperature units, open the

battery cover and select °F or °C.

2. Hold the meter by its handle grip and point it

toward the surface to be measured.

3. Push and hold the MEASURE button to turn the

meter on and begin testing. The display will light

if the battery is good. Replace the battery if the

display does not light.

4. While measuring, the current temperature will
appear on the LCD.

5. Release the MEASURE button to hold the reading.

6. Note: To conserve battery life, meter automatically

powers down in 7 seconds once button is released.

Specifications

Temperature range –31 to 525°F (–35 to 302°C)
Resolution 0.1°F/C

Accuracy

Response time Less than 150 ms
Emissivity Fixed at 0.97
Distance-to-sight

ratio (field of view)
Laser Single Class 2 (II) laser
Spectral range 8 to 14 µm
Oper. temperature 32 to 122°F (0 to 50°C)
Storage temp. 14 to 140°F (–10 to 60°C)
Dimensions 7" x 1
Power One 9 V battery

39 to 150°F (4 to 65°C) ±2°F (1°C)

Below 39°F (4°C) ±3.6°F (2°C)

Above 150°F (65°C) ±1% of reading + 2°F (1°C)

D/S = Approximately 4:1 ratio

(D = distance, S = spot)

3

⁄4" x 11⁄2" (17.8 x 4.4 x 3.8 cm)

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Field of View

The meter’s field

of view is 4:1,

meaning that if
the meter is
4 inches from
the target, the
diameter of the
object under test
must be at least
1 inch. Other distances are shown in the diagram
above. Make sure that the target is larger than the
meter’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.

Safety

• Use extreme caution when laser beam is turned on.

• Do not let the laser beam enter your eye, another

person’s eye or the eye of an animal.

• Be careful not to let the laser beam on a reective

surface strike your eye.

• Do not allow the laser

light beam to impinge on

any gas which can explode.

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Maintenance, Calibration, and Repair

Cleaning and Storage

• The meter should be cleaned with a damp cloth

and mild detergent when necessary. Do not use
solvents or abrasives.

• Store the meter in an area with moderate

temperature and humidity

Battery Replacement

If the battery power is insufficient, the Low-battery
icon will appear on the LCD. Unscrew the battery

cover and replace the 9 V battery. Rescrew the cover

until it is securely closed.

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