Digi-Sense 20250-25 Manuel utilisateur

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

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

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

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

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

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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.

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.

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.

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)

(Set Emissivity)

(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)

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.

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.

Table des matières

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