Digi-Sense 20250-25 User manual

THE STANDARD IN PRECISION MEASUREMENT
Professional Dual-Laser Infrared Thermometer
with 50:1 Distance-to-Sight Ratio, Data Logging
with Bluetooth®Smart App, Single Type K Input,
and Temperature Alarm
with NIST-Traceable Calibration
Model 20250-25
User Manual

2
Introduction
The Digi-Sense Professional Dual-Laser Infrared Thermometer with
Bluetooth®(Model 20250-25) with 50 to 1 distance-to-sight ratio offers fast
response and high accuracy. This heavy-duty meter is ideal for a wide
range of applications including food preparation, safety and fire inspection,
plastic molding, marine, HVAC, and fleet maintenance. Advanced features
include internal data logging, USB interface for data transmission, tempera-
ture alarm, adjustable emissivity, temperature differential, data Hold, Max/
Min/Avg readings, and auto power-off. The meter also supports contact
measurement through a type K thermocouple input. The instrument is fully
tested and calibrated to NIST-traceable standards. 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 type K flexible probe
3. Software
4. Tripod
5. Carrying case
6. One 9 V battery
7. User manual
8. NIST-traceable calibration report with data

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Key Features
• 50:1 Distance-to-sight ratio
• 1% basic accuracy
• Dual laser sighting
• Bluetooth interface for transition to a smart device
• Internal data logging up to 32K IR readings
• Contact measurements via type K thermocouple input
• Precise noncontact IR measurements
• Rapid detection function
• Adjustable emissivity from 0.10 to 1.0
• User-selectable ºC or ºF units
• Automatic data Hold
• MAX/MIN/AVG temperature displays
• Temperature differential
• High and low alarms (audible)
• Automatic selection range and display resolution
• Trigger lock
• Backlight Dot-matrix display
• Automatic power-off to conserve battery life

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Meter Description
1. IR sensor
2. Laser pointer beam
3. Type K thermocouple input
4. USB power port
5. Dot-matrix display
6. F1 / Down button
7. F2 button
8. F3 / Up  button
9. MODE button
10. Lens cover with magnetic lock
11. Measurement trigger
12. Battery cover
13. Handle grip
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Display Layout
1. SCAN/HOLD measuring
indicator
2. Laser pointer indicator
3. Bluetooth icon (transmit data)
4. Current time
5. Low-battery indicator
6. Emissivity or type K
temperature readout
7. MAX or AVG icons
8. Current temperature readout
9. MIN or DIF icons
10. °C and °F temperature icons
11. Bar graph
12. Menu - Level 1
13. Menu - Level 2
14. Menu - Level 3
15. Menu - Level 4
0.00
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 
  
 
 
  
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123 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 locate the hot spot.
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 (preset in the unit). 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 on facing page.)
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 above.
• 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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Emissivity Values
Substance Thermal emissivity Substance Thermal emissivity
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 Charcoal (powder) 0.96
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
Setup and Operation
1. Hold the meter by its handle grip and point it toward the surface to be
measured.
2. Pull and hold the trigger 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.
Meter automatically powers down after 10 seconds once the trigger is released.
3. While measuring, the SCAN icon will appear in the upper left-hand corner of the LCD.
4. Release the trigger and the HOLD icon will appear at the top of the LCD,
indicating that the reading is being held.

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Mode / Menu Overview
By pressing the MODE button, the user can access the devices setting. Each
time the MODE button is pressed the setup menu advances to the next group-
ing of features. The table below outlines the different Menu levels and the func-
tions available via the corresponding F keys.
Mode / Menu Level 1
MnMx (Minimum / Maximum)
This function allows the user to access the last saved Min / Max reading taken.
The thermometer takes a minimum (MIN) and maximum (MAX) temperature
reading each time the trigger is engaged.
1. Pull the trigger to take a measurement.
2. Release the trigger to stop taking the measurement.
3. Press the MODE button until MnMx (Min / Max) appears.
4. Press the F1 (MnMx) softkey to return to MnMx view if display is showing
“Avg”.
The screen will display the minimum and maximum temperature until another
function is chosen. The readings will update each time the trigger is pulled.
MIN = Minimum value of measurement.
MAX = Maximum value of measurement.
Save
This function allows the user to save the last reading taken.
1. Pull the trigger to take a measurement.
2. Release the trigger to stop taking the measurement.
3. Press the MODE button until Save appears.
Menu
level
F1 Button
(Function / Description)
F2 Button
(Function / Description)
F3 Button
(Function / Description)
1MnMx (Display
Min or Max temperature)
Save
(Save reading to memory)
Avg (Display average or
differential temperature)
2Unit
(Select the unit °C/°F)
Mem
(Review/delete memories)
E
(Set Emissivity)
3
(Trigger Lock)
Lit (Adjust backlight
brightness)
Laser
(Select laser on/off)
4HI (Set and enable
the high alarm)
Set
(General settings)
Lo (Set and enable
the low alarm)

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4. Press the F2 (Save) softkey to enter the Save menu.
5. Press the F1 (Yes) softkey to save the reading, or F3 (Esc) softkey to escape.
The saved reading includes:
o Assigned record number
o IR temperature
o Emissivity
o Date/Time
Avg (Average or Differential)
This function allows the user to view the average (AVG) or differential (Dif)
temperature each time a reading is taken.
1. Pull the trigger to take a measurement.
2. Release the trigger to stop taking the measurement.
3. Press the MODE button until Avg (Avg / Dif) appears.
4. Press the F3 (Avg) softkey to return to Avg view if display is showing “MnMx”.
The screen will display the average and differential temperature until another
function is chosen. The readings will update each time the trigger is pulled.
AVG = Average value of measurement.
DIF = Differential value of measurement.
Mode / Menu Level 2
Unit
This function allows the user to choose between C (Celsius) or F (Fahrenheit)
unit of temperature measurement.
1. Pull the trigger to take a measurement.
2. Release the trigger to stop taking the measurement.
3. Press the MODE button until Unit appears.
4. Press the F2 (°C) softkey to set to Celsius or F3 (°F) softkey to set to
Fahrenheit.

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Mem (Memory)
This function allows the user to review or delete saved measurements.
Saved data includes temperature, date/time, emissivity, and record numbers.
1. Pull the trigger to take a measurement.
2. Release the trigger to stop taking the measurement.
3. Press the MODE button until Mem appears.
4. Press the F2 (Mem) softkey to access the Memory menu.
5. To review readings, press the F1 () softkey to toggle down and
F3 () softkey to toggle up through the records.
6. To delete all or an individual record press the F2 (Del) softkey.
6.1 Press F1 (Yes) softkey to confirm deletion of the viewed individual
record or F3 (Esc) softkey to escape.
6.2 Press F2 (All) softkey to delete all records.
6.2.1 Press F1 (Yes) softkey to confirm deletion of all stored records
or F3 (Esc) softkey to escape.
Emissivity
This function allows the user to adjust the emissivity value manually or select
from a list of materials with pre-defined emissivity values.
Note: Default emissivity is 0.95.
1. Pull the trigger to take a measurement.
2. Release the trigger to stop taking the measurement.
3. Press the MODE button until Eappears.
4. Press the F3 Esoftkey.
4.1 To adjust the review emissivity value manually, press the F1 ()
softkey to toggle down and F3 () softkey to toggle up through
the values.
4.2 To adjust emissivity through a list of materials with pre-defined
emissivity values press F2 (Tab) softkey.
4.2.1 To adjust the review materials, press the F1 () softkey to
toggle down and F3 () softkey to toggle up through the list.
Press F2 (Ok) softkey to confirm selection.
4.3 Press the MODE button when finished to return to the main menu.

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Mode / Menu Level 3
Trigger Lock
This function allows the thermometer to be locked into continuous
measurement mode.
1. Pull the trigger to take a measurement.
2. Release the trigger to stop taking the measurement.
3. Press the MODE button until appears.
4. Press the F1 softkey to lock the trigger.
5. Press the F1 softkey again to unlock the trigger and resume
normal operation.
Lit (Backlight)
This function allows the user to adjust the backlit display. The unit has
eight brightness levels.
1. Pull the trigger to take a measurement.
2. Release the trigger to stop taking the measurement.
3. Press the MODE button until Lit appears.
4. Use the F2 (Lit) softkey to adjust the backlight brightness. Each time the
F2 (Lit) softkey is pressed, the display will toggle through the eight brightness
settings. The backlight can be disabled using the Setup menu. See “Set” on
page 12 for more information.
Laser
This function allows the user to turn on or off the dual lasers equipped.
1. Pull the trigger to take a measurement.
2. Release the trigger to stop taking the measurement.
3. Press the MODE button until Laser appears.
4. Press the F3 (Laser) softkey to enable or disable the laser.
Note: The laser icon at the top right on the screen will display when active.

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Mode / Menu Level 4
Hi (alarm)
This function allows the user to program the set point of when the out-of-range
high temperature alarm will trigger. An alarm will sound, and the display will
flash when the set point is reached.
1. Pull the trigger to take a measurement.
2. Release the trigger to stop taking the measurement.
3. Press the MODE button until Hi appears.
4. Press the F2 (On/Off) softkey to turn the alarm on or off.
5. To adjust the alarm set point, press the F1 () softkey to toggle down and
F3 () softkey to toggle up to desired temperature.
Lo (alarm)
This function allows the user to program the set point of when the out-of-range
low temperature alarm will trigger. An alarm will sound, and the display will flash
when the set point is reached.
1. Pull the trigger to take a measurement.
2. Release the trigger to stop taking the measurement.
3. Press the MODE button until Lo appears.
4. Press the F2 (On/Off) softkey to turn the alarm on or off.
5. To adjust the alarm set point, press the F1 () softkey to toggle down and
F3 () softkey to toggle up to desired temperature.
Set (sub menu)
SET Time Set time
Date Set date
Backlight Adjust backlight brightness
Buzzer
Button Enable or disable button sound
Alarm Enable or disable alarm sound
Bluetooth Enable or disable Bluetooth sound
Contrast Adjust display contrast
APO time Adjust auto power-off time
Data log
Switch Enable or disable the data log
Sample rate Set the data log sample rate
Delete Delete all data log
Bluetooth ON/OFF Enable or disable Bluetooth

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Time
Function allows user to set and change the time on the thermometer.
1. Pull the trigger to take a measurement.
2. Release the trigger to stop taking the measurement.
3. Press the MODE button until Set appears.
4. Press the F3 (Set) softkey to enter the Set menu.
5. Press the F1 () softkey to toggle down and F3 () softkey to toggle up
to select Time.
6. Press the F2 (Set) softkey to enter time setting.
6.1. Press the F1 () softkey to toggle down and F3 () softkey to toggle
up to select the desired hour. Press F2 (Next) softkey to confirm
selection and advance.
6.2. Press the F1 () softkey to toggle down and F3 () softkey to toggle
up to select the desired minutes. Press F2 (Ok) softkey to confirm
selection.
Note: 24-hour time format.
Date
Function allows user to set and change the date on the thermometer.
1. Pull the trigger to take a measurement.
2. Release the trigger to stop taking the measurement.
3. Press the MODE button until Set appears.
4. Press the F3 (Set) softkey to enter the Set menu.
5. Press the F1 () softkey to toggle down and F3 () softkey to toggle up
to select Date.
6. Press the F2 (Set) softkey to enter date setting.
6.1. Press the F1 () softkey to toggle down and F3 () softkey to toggle
up to select year. Press F2 (Next) softkey to confirm selection and
advance.
6.2. Press the F1 () softkey to toggle down and F3 () softkey to toggle
up to select the desired month. Press F2 (Next) softkey to confirm
selection and advance.
6.3. Press the F1 () softkey to toggle down and F3 () softkey to toggle
up to select the desired day. Press F2 (Ok) softkey to confirm selection.

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Backlight
In normal use, the backlight is on. This function will allow the user to turn the
backlight on or off by adjusting the brightness level. Turning the backlight off
conserves battery power.
1. Pull the trigger to take a measurement.
2. Release the trigger to stop taking the measurement.
3. Press the MODE button until Set appears.
4. Press the F3 (Set) softkey to enter the Set menu.
5. Press the F1 () softkey to toggle down and F3 () softkey to toggle up to
select Backlight.
6. Press the F2 (Set) softkey to enter backlight setting.
6.1. Press the F1 () softkey to toggle down and F3 () softkey to toggle
up to adjust the brightness. Press F2 (Ok) softkey to confirm selection.
Buzzer
This function allows the user to enable or disable the button tone, alarm tone and
Bluetooth tone.
1. Pull the trigger to take a measurement.
2. Release the trigger to stop taking the measurement.
3. Press the MODE button until Set appears.
4. Press the F3 (Set) softkey to enter the Set menu.
5. Press the F1 () softkey to toggle down and F3 () softkey to toggle up to
select Buzzer.
6. Press the F2 (Set) softkey to enter buzzer setting.
6.1. Press the F1 () softkey to toggle down and F3 () softkey to toggle
up to select Button, Alarm or Bluetooth.
6.2 Press F2 (On/Off) softkey to turn sound on or off for the function.
7. Press the MODE button when finished to return to the main menu.
Contrast
Function allows user to set the contrast level of the display for different
environments.
1. Pull the trigger to take a measurement.
2. Release the trigger to stop taking the measurement.
3. Press the MODE button until Set appears.
4. Press the F3 (Set) softkey to enter the Set menu.

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5. Press the F1 () softkey to toggle down and F3 () softkey to toggle up to
select Contrast.
6. Press the F2 (Set) softkey to enter contrast setting.
6.1. Press the F1 () softkey to toggle down and F3 () softkey to toggle
up to adjust the contrast value from 30 to 99. Press F2 (Ok) softkey to
confirm selection.
APO time
Function allows user to set the time interval for when the unit will automatically
power off from 7 to 60 seconds. The APO function is set to always on while in
Scanning mode, Locked Scanning mode or in locked Data Logging mode.
1. Pull the trigger to take a measurement.
2. Release the trigger to stop taking the measurement.
3. Press the MODE button until Set appears.
4. Press the F3 (Set) softkey to enter the Set menu.
5. Press the F1 () softkey to toggle down and F3 () softkey to toggle up to
select APO Time.
6. Press the F2 (Set) softkey to enter APO Time setting.
6.1. Press the F1 () softkey to toggle down and F3 () softkey to toggle up
to adjust the time interval from 7 to 60 seconds. Press F2 (Ok) softkey to
confirm selection.
Data Log
This function allows the user to activate the data logging function and set the
sampling interval from 1 to 3600 seconds (1 hour). The thermometer can store
up to 32K readings.
1. Pull the trigger to take a measurement.
2. Release the trigger to stop taking the measurement.
3. Press the MODE button until Set appears.
4. Press the F2 (Set) softkey to enter the Set menu.
5. Press the F1 () softkey to toggle down and F3 () softkey to toggle up to
select Datalog.
6. Press the F2 (Set) softkey to enter Datalog.
6.1 Press the F1 () softkey to toggle down and F3 () softkey to toggle up
to select Enable, Sample Rate, or Delete.

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Enable - By selecting the Enable function to the ON position, the data logging
function will be activated. The “D”symbol will display on the main
screen to indicate when the data logging function is active.
6.2. Press the F2 (On/Off) softkey and select ON; the data log function will
be turned on.
6.3 Press the Trigger to engage the Trigger Lock. The “D”symbol will
display to indicate when the data logging function is active.
6.4. Press the Trigger again to disengage the Trigger Lock.
Note: Repeatedly pressing the trigger while the data logging function
is active will turn the data logging on and off.
6.5. Press the F2 (On/Off) softkey and select OFF; the data log function
will be turned off. The “D”symbol will disappear from the display
to indicate when the data logging function is no longer active.
Sample Rate - Allows the user to set the sampling interval from
1 to 3600 seconds. Note: This should be done before enabling the
data log feature in the ON position.
6.2. Press the F2 (Ok) softkey to enter Sample Rate setting.
6.3 Press the F1 () softkey to toggle down and F3 () softkey to toggle
up to adjust the Sample Rate time.
6.4. Press the F2 (Ok) softkey when finished.
Delete - Allows the user to delete the data stored in memory.
6.2. Press the F2 (Del) softkey to enter Delete setting.
6.2.1 Press the F2 (Yes) softkey to delete all stored data.
6.2.2 Press the F3 (Esc) softkey to exit without deleting any data.
Bluetooth®
This function allows the thermometer to send real-time data or memory data to a
device using the D/S IR Therm smart device app via Bluetooth.
1. Pull the trigger to take a measurement.
2. Release the trigger to stop taking the measurement.
3. Press the MODE button until Set appears.
4. Press the F3 (Set) softkey to enter the Set menu.
5. Press the F1 () softkey to toggle down and F3 () softkey to toggle up to
select Bluetooth.
6. Press the F2 (Set) softkey to enter Bluetooth setting.
7. Press the F2 (On/Off) softkey to turn Bluetooth on or off.

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Thermocouple Probe Operation
1. Insert the thermocouple probe with mini connector into the thermocouple slot
located under the front housing beneath the dust cover.
2. Once the thermocouple probe is plugged into the thermometer, the lower
display which normally shows the minimum or differential IR temperature will
now display “TK” and the reading coming from the thermocoupleprobe.
Smart Device Software
Wireless setup is simple. Download the free D/S IR Therm app to your Android™
or iOS®device. Place the thermometer in Bluetooth mode and open the app on
your device. The meter will be sensed by your device and be listed as an avail-
able source that you can select. Once selected, the data sensed by the meter is
displayed on your device and some of the instrument functions can be accessed.
A full description of its operation is available for download in the app.
SPECIFICATIONS
IR temperature range –58 to 3362°F (–50 to 1850°C)
T/C temperature range –58 to 2498°F (–50 to 1370°C)
Resolution 0.1°F/C below 1000°, 1°F/C above 1000°
IR accuracy
From –58 to 68°F (–50 to 20°C): ±5.4°F (3°C)
From 68 to 932°F (20 to 500°C): ±1.0% ± 1.8°F (1°C)
From 932 to 1832°F (500 to 1000°C): ±1.5%
From 1832 to 3362°F (1000 to 1850°C): ±2.0%
T/C accuracy From –58 to 32°F (–50 to 0°C): ±3.6°F (±2°C)
From 32 to 2498°F (0 to 1370°C): ±0.5% of reading ± 3°F (±1.5°C)
IR response time 150 ms
Emissivity Adjustable from 0.10 to 1.0
Distance-to-sight ratio
(field of view)
D/S = approximately 50:1 ratio
(D = distance, S = spot)
Laser Dual Class 2 (II) lasers
Spectral range 8 to 14 µm
Out-of-range indication LCD will show “----”
Operating temperature 32 to 122°F (0 to 50°C)
Storage temperature 14 to 140°F (–10 to 60°C)
Weight 17.4 oz (494 g)
Dimensions 71⁄2" x 6" x 21⁄4" (18.9 x 15.2 x 5.7 cm)
Power One 9 V battery

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Field of View
The meter’s field of view is 50:1, meaning that if the unit is 50 inches from the
target, the diameter of object under test must be at least 1 inch. Other distances
are shown in the diagram at right. 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. As the distance (D) from the object increases, the spot size (S) of the
area measured by the meter becomes large. The relationship between distance
and spot size is shown above. The focal point is 36" (914 mm). The spot sizes
indicate 90% encircled energy.
Safety
• Use extreme caution when the 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 reflective
surface strike your eye.
• Do not allow the laser light beam to impinge on any gas which can explode.

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Maintenance, Recalibration, 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 (refer to the specifications on page 17).
Battery Replacement
If the battery power is insufficient, the Low-battery icon
will appear on the LCD. Open the battery cover and
replace the 9 V battery. Securely close the cover.
Open the
battery cover
9V battery
It is recommended that Digi-Sense products are calibrated annually to
ensure proper function and accurate measurements; however, your quality
system or regulatory body may require more frequent calibrations. To schedule
your recalibration, please contact InnoCal, an ISO 17025 calibration laboratory
accredited by A2LA.
Phone: 1-866-INNOCAL (1-866-466-6225)
Fax: [phone]
E-mail: [email protected]
Web: InnoCalSolutions.com

For Product and Ordering Information, Contact:
Toll-Free: 1-800-323-4340
Phone: [phone]
Fax: [phone]
ColeParmer.com/Digi-Sense
Manual Part No. 00102-04
1065DGMAN_20250-25
It is recommended that Digi-Sense products are calibrated annually to
ensure proper function and accurate measurements; however, your quality
system or regulatory body may require more frequent calibrations. To schedule
your recalibration, please contact InnoCal, an ISO 17025 calibration laboratory
accredited by A2LA.
Phone: 1-866-INNOCAL (1-866-466-6225)
Fax: [phone]
E-mail: [email protected]
Web: InnoCalSolutions.com