UNI-T 40725 IR Thermometer User Manual

: June 4, 2024
: UNI-T

UNI-T 40725 IR Thermometer User Manual

Overview

Laser
Infrared sensor
Trigger
Battery cover
Tripod mounting connection
LCD display
Mode/down button
SET button
HI/LO/up button
LOG button
Laser warning label

Specifications

Display

Use

Measuring temperature

Press the trigger (3) to turn the laser on.
.Aim at the target and press the trigger (3) again to take a measurement. A laserguide shows where the thermometer is aimed. The text SCAN shows on the display. Release the trigger and the result is shown on the display. The text HOLD shows on the display to indicate the measurement was completed.
The thermometer turns off automatically after 15 seconds of inactivity.

Note! To ensure an accurate reading you can determine the measuring distance to your target by using the “Distance:Spot (D:S) Ratio” in the
Specifications. For example, if you use the IR thermometer to measure the temperature of an object with a diameter of about 10 cm and the measuring spot size (S) is about 5, then according to the D:S ratio the optimal measuring distance is about 600 mm.

View the last measured value

Press the trigger (3) to turn on the thermometer. The latest measurement data is displayed. Press the MODE button (7) to switch the Maximum (MAX) –> Minimum (MIN)
–> Avarage (AVG) –> Difference (DIF) measurement modes in turn and the temperature value of the corresponding mode shows in the display.

Lock measurement interface

Press and hold the SET button (8) for 3 seconds when the display shows HOLD to enter the lock measurement setting interface. Turn on/off the lock measurement by pressing the Up and Down buttons (7, 9). When the lock measurement is turned on, press the LOG button (10) to enter the timing setting “00.00” for the lock measurement. The selected time position flashes and the time value can be adjusted by pressing the Up and Down buttons (7, 9). Set the timing to “00.00” to turn off the timing function.
When the lock measurement is set, press the trigger (3) to enable it.
The LOCK icon appears on the thermometer screen and the SCAN icon flashes. The thermometer continously measures the targettemperature for the time set in the previous stage, not needing to manually press the trigger (3) to measure the temperature.
Press the trigger (3) again, the LOCK and SCAN icons disappear and the HOLD icon appears. The thermometer stops the measurment and holds the last measured value.
After setting the lock measurement time (1 min to 5 hrs) the measurement starts. When the set time is reached, the thermometer automatically turns off and stores the last measured value. Press the trigger (3) to turn on the thermometer and to view the last measured value.
The measurement value is cleared by pressing and holding the trigger (3).

Data storage mode

Press the LOG button (10) when HOLD is showing on the display to enter the data storage mode. The display shows the LOG icon and the LOG group number.
Select the LOG group number (01-99) by pressing the Up and Down buttons (7, 9). If the selected location has stored data, the temperature value and storage time is displayed. If there is no data in the selected LOG group number, “—-” is displayed. After selecting the group number, press the trigger (3) for measurement. After completing the measurement, press the LOG button. The screen flashes three times to indicate that the measurement was successfully saved to the LOG group number and automatically switches to the next group number.
Press the Up or Down buttons (7, 9) to display the stored LOG group measurement.
Press and hold the LOG button (10) for 10 seconds to erase all of the saved LOG group measurements. The display flashes and shows LOG group number “01” to confirm that the group is deleted.
Press and hold the LOG button (10) for 3 seconds to exit the data storage mode. The display flashes to confirm and the LOG icon disappears.

Scheduled measurement mode

Press and hold the SET button (8) for 3 seconds when the display shows HOLD to enter the lock measurement setting interface. Press the SET button (8) again to enter the scheduled measurement mode. Turn on/off the scheduled measurement mode by pressing the Up and/or Down buttons (7, 9)
After entering the scheduled measurement mode, follow the steps below to set its parameters:
a) Press the LOG button (10) to select Year –> Month –> Day –> Hour –>
Minute in turn to set the start time of the scheduled measurement. The selected setting position flashes, and the value can be adjusted by pressing the Up or Down buttons (7, 9)
b) Press the LOG button (10) to select Hour –> Minute in turn to set the interval time of the scheduled measurement.
c) Press the LOG button (10) to set how many measurements (01-99) are to be executed during the set time, adjust the value using the Up or Down buttons (7, 9)
d) Press the SET button (8) 2 times or press the trigger (3) 1 time, the Auto Interval icon flashes. When the start time of the schedules measurement is reached, the thermometer automatically starts temperature measurement and stores the current time and measured value. Each
time the interval time is reached, the thermometer automatically
measures and stores the current data until the last interval.
In the HOLD interface, press the LOG button for 3 seconds to enter the scheduled measurement log value query mode. The screen displays the Auto Interval icon, the LOG icon and the log group number. In this mode, press the Up and Down buttons (7, 9) to query the measured temperature value corresponding to the scheduled time. Press and hold the LOG button (10) for 10 seconds to erase all of the saved LOG group measurements. The display flashes and shows LOG group number “01” to confirm that it has been deleted.

System time setting

Press the SET button (8) for 3 seconds when the display shows HOLD to enter the lock measurement setting interface and press the SET button (8) twice to enter the system time setting interface. Press the LOG button (10) to select and save Year –> Month –>
Day –> Hour –> Minute in turn to set the current time and date. The selected setting position flashes and the value can be adjusted by pressing the Up and Down buttons (7, 9).
Press the SET button (8) or press the trigger (3) to exit the system time setting.
Note! System time need to be set again after battery replacement or power failure.

Temperature alarm

Press the HI/LO button (9) to turn the alarm function on/off.
When HI/LO limit alarm function is turned on and the measured temperature value is higher than the set alarm limit, the LED above the screen lights up red and and HI shows on the display. If the value drops below the set alarm limit the LED above screen lights up blue and LO shows on the display. lf the audible alarm function has been turned on, the buzzer beeps.
When HI/LO limit alarm function is turned on and the measured temperature value is within the high and low alarm limit range, the LED above the screen lights up green and the OK indicator is displayed

Function settings

To reach the function settings the thermometer needs to be showing HOLD in the display, then press the SET-button (8) and the trigger (3) at the same time. In setting mode you can toggle between different settings by pressing the trigger, pressing the SET button continously or wait for 10 seconds to exit settings.

HI/LO Alarm setting
Press the SET button (8) when the display shows HOLD to enter the high/ low alarm limit setting. Press the LOG button (10) to quickly select the preset high/low alarm limit value (P1-P5). If there is no desired value among the preset values, select any value closest to the high/low alarm limit, and adjust it by pressing the Up or Down buttons (7, 9).
Emissitivity setting
Press the SET button (8) until the emissivity setting is displayed. Press the LOG button (10) select the preset emissivity value (P1-P5). If there is no desired value among the preset values select any value closest to the desired emissivity setting, and adjust it by pressing the Up or Down buttons (7, 9).
Temperature unit setting
Press the SET button (8) until the temperature unit setting is displayed, and switch between °C and °F by pressing the Up or Down buttons (7, 9).
Audible alarm setting
Press the SET button (8) until the audible alarm setting is displayed, and turn on/off the audible alarm by pressing the Up or Down button (7, 9).
Laser indication setting
Press the SET button (8) until the laser indication function setting is displayed, and turn on/off the laser indication function by pressing the Up or Down button (7, 9). When it is turned on the laser indicator displays on the display and the laser accurately indicates the position you are measuring during temperature measurement.

Field of view

Make sure that the measured target is larger than the spot size. The smaller the target the closer the test distance should be. To obtain the optimum measurement result it is recommended that the target being measured is two times larger than the spot size.

Emissivity

Emissivity is a symbol of energy radiation of a material. The emissivity of most organic materials and coated or oxidized surfaces is about 0.95. To measure the temperature of a bright metal surface, cover the surface to be tested with masking tape or matt black paint with a high emissivity setting, wait a few moments and measure the temperature of the tape or black paint surface when it reaches the same temperature
as the covered surface or object.

Cleaning and maintenance

Use clean compressed air to blow away any dirt or particles. Use a wet cotton swab to carefully clean the lens. Use a wet sponge or soft cloth to clean the exterior of the thermometer.
Do not rinse the thermometer or immerse it in water

Troubleshooting

Safety information

Do not point the laser on persons or animals. Do not look at the laser directly or through optical tools.
Do not open or attempt to service the unit on your own. This should only be done by the manufacturer, its service agent or similarly qualified persons to avoid hazard.
If the battery symbol is flashing, replace the battery immediately to prevent inaccurate measurement.
lnspect the case before using the thermometer. Do not use the thermometer if it appears damaged. Look for cracks or missing plastic.