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Introduction
Structure
Thermocouple channel T1, T2, T3, T4 input
USB interface
Display screen
Buttons
Tripod nut
Battery cover
Figure 1
LCD Indicators/Icons
The LCD indicators/icons are shown in Figure 2.
1. Settings
2. Bluetooth communication
3. USB communication
4. Data record
5. Timing measurement mode
6. Auto power off
7. Battery status
8. Primary display of four-channel value
9. Temperature units
10. Time
11. Delete the saved data
12. Offset value compensation
13. Recording interval
14. Thermocouple type
15. Temperature difference between channels
16. Data hold
Short press
Difference between channels/Return
Start/Stop recording the data
Turn on/off the backlight
Data hold/Confirm the setting
Enter the timing measurement
mode/Up or add the value
Unit switching/Down or
subtract the value
Long press
Enter/Exit the setting interface
/
Power on/off
/
Exit the timing measurement mode/
Turn on or off the Bluetooth
/
Button
EN
Figure 2
UT325F
4-Channel Thermometer User Manual
Overview
UT325F 4-Channel Thermometer ("Thermometer") is a high- accuracy digital thermometer that uses a
thermocouple as the temperature probe and comes with a microprocessor.
Features:
It can work with type K, J, T, E, R, S and N thermocouples.
With four-channel temperature measurement, the temperature difference can be displayed.
It can set the time interval to automatically record data.
72,000 groups of data can be stored.
Offset value compensation can be set.
It can connect to a smartphone (Android or iOS) via Bluetooth and edit or view the recorded data and
save and export charts in the smartphone APP.
It can connect to a computer via the USB cable to edit or view the recorded data and save and export
charts in the PC software.
Use the thermometer according to the steps in this user manual. Otherwise, the protection provided by
the product may be impaired.
Safety Instructions
Warning
A Warning identifies conditions and actions that pose hazards to users. To avoid electric shock or personal
injury, please follow these instructions.
Check the housing for broken or missing plastic parts, especially insulation around joints before using
the thermometer. Do not use the thermometer if it is damaged.
Disconnect the thermocouple from the thermometer before opening the housing.
When is displayed on the screen, replace the batteries as soon as possible.
If the thermometer is not operating properly, do not continue to use it because the protection provided
by the product may have been impaired. If in doubt, the thermometer should be sent to a designated
place for repair.
Do not use the thermometer near explosive gases, vapors or dust.
Do not apply voltage between thermocouples or between the thermocouple and the ground terminal.
When potential difference between thermocouples may occur, an insulating thermocouple should be used.
Use the specified replacement parts when repairing the thermometer.
Do not use the thermometer with its housing or cover open.
Cautions
A Caution identifies conditions and procedures that could cause thermometer damage or equipment
under test damage. Please use the thermometer carefully.
Select the appropriate thermocouple, function scale or range scale when using the thermometer.
When taking multi-channel measurement, it is necessary to ensure that there is no potential difference
between the two channels.
Please do not try to charge the batteries.
Pay attention to the battery polarity when installing.
Setting Interface
In the main interface, long press to enter the setting interface. The symbol will show at the top left
of the screen. Press or to step through the setting options. The sequence is: Interval of auto
recording
→
Saved data and deletion → Thermocouple type → Offset value compensation → Auto
power off→ Power frequency anti-interference → Time → Restore factory settings.
Long press to exit the setting interface.
Interface Description
Interval of auto recording (INTERVAL)
Short press in this interface, and the second of the time in the lower right corner will blink. Press
or to add or subtract the blinking value. Press to set the value of hour, minute and second in
sequence. After setting, short press to save and return to the INTERVAL interface (If there is no
operation for a period of time, it automatically exits the modified state). Press to enter the next setting
interface.
Note: When the interval is 00: 00: 00, the auto recording function will be disabled and turn into manual
recording. Press to record the data once and stop recording.
Saved data and deletion (MEMORY)
In this interface, only the number of the saved data can be displayed. The information such as the recording
time and temperature can be viewed in the smartphone APP or PC software. Press to choose whether
to delete the saved data or not. The symbol “no” will flash by default. Press or to switch between
“yes” and “no”. When “yes” is flashing, press to turn into the “doing” interface (deleting). The data will
be deleted after one minute, and then it will return to the MEMOR Y interface (If there is no operation for
a period of time, it automatically exits the modified state). In the modified state, press to return. Press
to enter the next setting interface.
Note: When “doing” is displayed, it means that it takes a period of time to delete the historical data.
Thermocouple type (TYPE)
In this interface, short press , and the thermocouple type of the channel T1 will flash. At this time,
pressing or can switch the thermocouple type. Press to confirm the selection and to set the
thermocouple type of the channel T2. Repeat the preceding steps until the channel T4 is set up, and
press to save the settings and return to the TYPE interface (If there is no operation for a period of
time, it automatically exits the modified state). In the modified state, press to return. Press to enter
the next setting interface.
Offset value compensation (OFFSET)
In this interface, short press to display the temperature and the ambient temperature (E) of the channel
T1. The default compensation value “0.0” will flash. At this time, pressing or can adjust the
compensation value of the channel T1. Press to complete the T1 setting and enter the T2 setting.
Repeat the preceding steps until the channel T4 is set up, and press to save the settings and return
to the OFFSET interface (If there is no operation for a period of time, it automatically exits the modified
state). In the modified state, press to return. Press to enter the next setting interface.
1.1 Adjust the error of the temperature probe with the offset value
The reading of the thermometer can be adjusted and the error of a thermocouple can be compensated
in the OFFSET interface.
1. Insert the thermocouple into the input jack.
2. Place the thermocouple in a known and stable temperature environment such as an ice bath or dry
well calibrator.
3. Let the temperature readings settle down.
4. Change the offset compensation value according to the interface instructions until the temperature
reading is the same as the calibrated temperature.
Auto power off (SLP)
In this interface, short press to turn on/off the auto power off function. Press to enter the next setting
interface.
Power frequency anti-interference (Line)
In this interface, short press to switch between the power frequency anti- interference type 50Hz/60Hz.
Press to enter the next setting interface.
Time (Y M D h:m:s)
In this interface, short press to make the value of year/month/day/hour/ minute/second flash. Press
or to adjust the value. When the value of second is flashing, press , and “SAvE” will show on
the screen. Press again to confirm the adjustment, and “donE” will be displayed (If there is no operation
for a period of time, it automatically exits the modified state). Press to enter the next setting interface.
Restore factory settings (Sfr)
In this interface, short press to choose whether to restore factory settings or not. The symbol “no” will
flash by default. Press or to switch between “yes” and “no”. When “yes” is flashing, press to
restore factory settings and return to the main interface (If there is no operation for a period of time, it
automatically exits the modified state).
See the buttons detail as following
