UT320T 2 In 1 Thermometer
User Manual
UT320T
2 in 1 Thermometer User Manual
PREFACE
Thank you for purchasing the new UT320T thermometer. In order to use this product safely and correctly, please read this manual thoroughly, especially the Safety Instructions part.
After reading this manual, it is recommended to keep the manual at an easily accessible place, preferably close to the device, for future reference.
LIMITED WARRANTY AND LIABILITY
UNI-T guarantees that the product is free from any defect in material and workmanship within one year from the purchase date. This warranty does not apply to damages caused by accident, negligence, misuse, modification, contamination and improper handling. The dealer shall not be entitled to give any other warranty on behalf of UNI-T. If you need warranty service within the warranty period, please contact your seller directly.
This warranty is the only compensation you can obtain. UNI-T will not be responsible for any special, indirect, incidental or subsequent damage or loss caused by any reason or speculation. As some areas or countries do not allow limitations on implied warranties and incidental or subsequent damage, the above limitation of liability and stipulation may not apply to you.
ABOUT
Due to different batches, the materials and details of actual products may be slightly different from the graphic information. Please refer to the goods received. The experimental data in the manual are theoretical values and all from UNI-T’s internal laboratories, for reference only. Customers cannot use them as bases for placing orders. If users have any questions, please contact customer service.
Overview
UT320T (“Thermometer “or” Product “) is a thermometer that combines infrared and probe measurements. Infrared measurement is used to quickly scan the surface temperature of an object by measuring the infrared energy radiated by the target surface. Probe measurement can accurately measure the internal temperature of objects.
Safety Instructions
Warning:
In order to prevent eye damage or personal injury, please read the following safety instructions before using the product:
- Do not point the laser directly at persons or animals or indirectly through reflective surfaces.
- Do not look directly at the laser or with optical tools (binoculars, microscopes, etc.).
- When the probe is unfolded, do not point it to persons or animals.
Cautions:
- If the laser irradiates the user’s eyes, please close the eyes immediately and turn the head away.
- Do not disassemble or refit the product and laser without permission.
- To ensure its safety and accuracy, this product should only be repaired by professional maintenance personnel using original replacement parts.
- Replace the batteries when the low battery indicator shows to prevent incorrect measurements.
- Please check the product before using it. If it is damaged, cracked on the surface or missing plastic parts, do not use it.
- In the infrared measurement mode, highly reflective objects or transparent materials will make the actual temperature higher than the measured temperature. When measuring these objects, pay attention to the risk of burns.
- Do not use the product in an environment with flammable and explosive liquid, gas or dust.
- Do not use the product around the environment with steam, dust, or large temperature fluctuations if it is in the infrared measurement mode. It may bring inaccurate results and risks.
- Put the product in the current environment for more than 30 minutes before using it to ensure infrared measurement accuracy.
- Do not leave the thermometer on or near objects of high temperature.
- Do not make the plastic housing contact with high temperature objects to prevent plastic deformation and melting.
- In the probe mode, do not insert the probe into the measured object for a long time.
- Take out the probe after 1 minute of measurement, and then measure after the product returns to normal temperature.
- Do not place the product in a dishwasher, oven, microwave, or soak in any liquid.
Product Structure
- Infrared sensor
- Single laser
- LCD
- Scan l Hold
Press it to turn on the thermometer in the infrared mode or wake up the thermometer in the probe mode. In the infrared mode: Press it to measure. Release it to hold the data.
In the probe mode: Switch measurement state (auto measurement/hold)
- Max/Min | ε
Short press (less than 0.5s):
View the maximum or minimum value
Long press (about 1.5s): Enable the emissivity setting function - T1/T2 |℃/℉
Short press (less than 0.5s): Enable the temperature difference calculation function
Long press (about 1.5s): Temperature unit conversion (℃/℉) - Probe
- Probe dial
- Battery cover screw
Screen Indicators/Icons
|
|
Data hold |
 |
Lock measurement |
 |
Emissivity |
 |
Value display |
 |
Temperature difference |
 |
Infrared/Probe measurement |
 |
Low battery |
 |
Temperature units (℉/℃) |
|
MAX MIN |
Maximum/minimum temperature |
Specifications
| Model | UT320T | ||
| LCD size | 18*28mm | ||
| LCD type | FSTN | ||
|
Infrared measurement |
Measuring range | -40℃~300℃ (-40℉~572℉) | |
| Temperature | Range | Accuracy | |
| -40℃≤t≤0℃: | ±(2.0+0.1×|t|)℃ | ||
| 0℃ t≤300℃: | ±2.0℃ or ±0.02×t℃ whichever is greater | ||
| -40℉≤t≤32℉: | ±(4.0+0.1×|t-32|)℉ | ||
| 32℉ t≤572℉: | ±4.0℉ or ±0.02×t℉ whichever is greater | ||
| Temperature coefficient | ±0.1℃/℃ or ±0.1%/℃ whichever is greater | ||
| Distance to spot ratio (D: S) | 8 : 1 | ||
| Emissivity | Adjustable (0.1~1.0) | ||
| Spectral range | 5μm~14μm | ||
| Response time | ≤500ms (95% of reading) | ||
| Repeatability | 1.0℃ or 1.0% whichever is greater (2.0℉ or 1.0% whichever is greater) | ||
| Laser | Class 2, single laser, power 1mW, wavelength 650±20nm | ||
| Operating time | About 30h (laser and backlight on) | ||
| Probe measurement | Measuring range | -40℃~300℃ (-40℉~572℉) | |
| Accuracy | Range | Accuracy | |
| -40℃≤t 0℃: | ±2.0℃ | ||
| 0℃ t≤300℃: | ±1.0℃ or ±0.01×t℃ whichever is greater | ||
| -40℉≤t≤32℉: | ±4.0℉ | ||
| 32℉ t≤572℉: | ±2.0℉ or ±0.01×t℉ whichever is greater | ||
| Probe measurement | Probe type | NTC |
| Minimum measuring depth | 12.7mm | |
| Operating time | About 180h (backlight on) | |
| Over range display | Measured value maximum range: display “OL” Measured value minimum range: display “-OL” | |
| Operating temperature | 0℃~50℃(32℉~122℉) | |
| Storage temperature | -20℃~60℃(-4℉~140℉) | |
| Operating humidity | <90%Rh (non-condensing) | |
| Highest operating altitude | 2000m | |
| IP rating | IP54 | |
| Drop test | 2m | |
| Battery type | 2 * 1.5V AAA | |
| Auto power off time | 10min | |
| Data hold | √ | |
| Lock measurement | √ | |
| Unit conversion (℃/℉) | √ | |
| Max/Min/ Difference | √ | |
| Certificates | Probe FDA certification | Conform to FDA standards |
| Laser safety standards | IEC 60825-1:2014; EN 50689:2021 |
|
| CE | EMC: EN 61326-1:2021; Safety: EN 61010-1:2010+A1:2019+AC:2019 |
|
| UKCA | Based on CE certification standards | |
| RoHS | Refer to RoHS Directive 2011/65/ EU Directive (EU) 2015/863 | |
| Product weight | About 110g (with batteries) | |
| Product size | 155*42*22.5mm | |
Operation
6.1 Replace Batteries
When using the product for the first time, please install the batteries first.
To remove the battery cover:
- Hold the metal ring on the screw with a hand or a tool, and turn the ring counterclockwise to unscrew the battery cover screw.
- Use a screwdriver to unscrew the battery cover. Battery type: 2 AAA alkaline batteries
Note:
- Pay attention to the battery polarity when installing.
- After replacing the batteries, close the battery cover and tighten the screw.
6.2 Power On/Off
- When the probe is folded, press the Scan|Hold button to turn on the thermometer and enter the infrared (non-contact) mode.
- When the probe is unfolded, it will enter the probe (contact) mode and the thermometer will be turned off when the probe is folded (not in the T1/T2 mode).
- When the thermometer is turned on, the backlight will automatically turn off if no button press occurs for nine minutes, and then the product will automatically shut down if still no button press occurs for one minute.
- When the probe is unfolded, after the product shuts down automatically, press the Scan|Hold button to wake it up.
- In the T1/T2 mode, the temperature difference can be calculated. If the probe is unfolded in the T1/T2 mode, fold the probe to switch to the infrared mode, and the thermometer will not be turned of f. If users want to fold the probe to turn of f the thermometer, please exit the T1/T2 mode first.
6.3 Temperature Measurement
Infrared mode:
Press the Scan|Hold button to measure the temperature, and release it to stop measuring. The top left corner of the LCD displays
, and the data is held.
Probe mode:
When the probe is unfolded, the product automatically starts measuring. Insert the probe at least 12.7mm into the measured object, and wait for the value to stabilize before reading the temperature. Press the Scan|Hold button. The top left corner of the LCD displays , and the data is held. Press the Scan|Hold button again to return to the auto measurement.
6.4 Function Settings
Lock measurement in the infrared mode:
- When the measured data is held in the infrared mode, press the Scan|Hold button twice, will show in the upper right corner of the LCD and the thermometer will enter the lock measurement mode. The measurement can be performed without pressing any buttons at this time.
- In the lock measurement mode, press the ScanlHold button to exit the lock measurement, and the icon will disappear
Max/Min:
- When the measured data is held, press the Max/Min|ε button to step through the Max, Min (the last continuous measurement) and exit viewing the Max/Min.
- If the temperature is measured when the Max/Min function is enabled, the Max and Min of the current continuous measurement are displayed
Emissivity adjustment:
- Long press the Max/Min|ε button to enter the emissivity setting interface.
- In the setting interface, press the Up/Down button to adjust the value. Short press once to add or subtract 0.01. Long press to add or subtract 0.1 per second.
- After the emissivity is set, press the Scan|Hold button to save the emissivity and return to the measurement interface.
- This function can only be enabled in the infrared mode.
Temperature difference:
After the thermometer is turned on for measurement, short press the T1/T2 | ℃/℉ button to step through T1>T2>T1-T2>T1. When T1-T2 is displayed, press the
Scan|Hold button to exit the T1/T2 mode (or long press the T1/T2 |℃/℉ button to exit in any state of the T1/T2 mode).
Temperature units:
Long press the T1/T2 |℃/℉ button to step through temperature units ℃/℉.
Infrared Measurement
7.1 D: S (Distance to Spot Ratio)
As the distance (D) between the thermometer and the measured target increases, the light spot diameter (S) of the measured area also increases. The relationship between measurement distance and light spot diameter is shown in the figure below.
The light spot diameter represents 95% of the energy in the circle
7.2 Field of View
When measuring, make sure that the measured target is larger than the light spot diameter (S). The smaller the target, the closer the test distance should be (refer to D: S for the detailed light spot diameter). It is recommended that the measured target be larger than twice the light spot diameter of the thermometer.
7.3 Emissivity
Emissivity represents the ability of the measured object to emit infrared energy.
Infrared measurement is to measure the infrared energy to determine the temperature.
Objects of different materials have different emissivity. The emissivity of most organic materials, painted or oxidized surfaces is about 0.95. The user can use masking tapes or flat paints to cover the metal surface, and then wait for a period of time to make the surface temperatures of the tapes/flat paints and the covered object the same. At this point, the surface temperature of the tapes/flat paints is equal to the metal surface temperature.
The following table shows the total emissivity ε of some metals and non-metals.
| Measured surface | Emissivity |
| Metals | |
| Aluminum | |
| Oxide | 0.2-0.4 |
| A3003 Alloy | |
| Oxide | 0.3 |
| Crude | 0.1-0.3 |
| Brass | |
| Polishing | 0.3 |
| Oxide | 0.5 |
| Cuprum | |
| Oxide | 0.4-0.8 |
| Electrical terminal board | 0.6 |
| Hastelloy Alloy |
0.3-0.8 |
| Inconel | |
| Oxide | 0.7-0.95 |
| Abrasive blasting | 0.3-0.6 |
| Electropolishing | 0.15 |
| Ferrum | |
| Oxide | 0.5-0.9 |
| Rusting | 0.5-0.7 |
| Ferrum (casting) | |
| Oxide | 0.6-0.95 |
| Non-Oxide | 0.2 |
| Casting | 0.2-0.3 |
| Ferrum (forging) Passivating |
0.9 |
| Plumbum | |
| Crude | 0.4 |
| Oxide | 0.2-0.6 |
| Molybdenum Oxide |
0.2-0.6 |
| Nickel Oxide |
0.2-0.5 |
| Platinum Black | 0.9 |
| Steel Cold rolling Burnishing Polishing |
0.7-0.9 0.4-0.6 0.1 |
| Zinc Oxide |
0.1 |
| Non-Metals | |
| Asbestos | 0.95 |
| Asphalt | 0.95 |
| Basalt | 0.7 |
| Carbon | |
| Non-Oxide | 0.8-0.9 |
| Graphite | 0.7-0.8 |
| Carborundum | 0.9 |
| Ceramic | 0.95 |
| Clay | 0.95 |
| Concrete | 0.95 |
| Cloth | 0.9 |
| Glass | |
| Convex glass | 0.76-0.8 |
| Smooth glass | 0.92-0.94 |
| Nonex | 0.78-0.82 |
| Sheet material | 0.96 |
| Gypsum | 0.8-0.95 |
| Ice | 0.98 |
| Limestone | 0.98 |
| Paper | 0.95 |
| Plastic | 0.95 |
| Water | 0.93 |
| Soil | 0.9-0.98 |
| Wood | 0.9-0.95 |
Maintenance and Cleaning
The ingress protection rating of UT320T thermometer is lP54. The housing and probe can be cleaned with a moist sponge or soft cloth. Please dry the product after cleaning.
Use a cotton swab soaked in water or medical alcohol to clean the surface of the lens.
Troubleshooting
| Phenomenon | Cause | Measure |
| Display OL | Measured value maximum range | Stop measuring |
| Display -OL | Measured value minimum range | Stop measuring |
| Display Err (startup) | Exceed the minimum/ maximum operating temperature or infrared sensor damage | Place the thermometer at 0℃-50℃ (32℉-122℉) for 30 minutes. If Err is still displayed, the product needs to be repaired. |
| Battery symbol flashes | Low battery | Replace batteries |
| Display Er0 (startup) | Internal damage | Restart the product or reinstall the batteries and then restart it. If the product still does not operate normally, repair it. |
| Inaccurate infrared measurement | Too far measurement distance, diameter of the measurement target 12mm | Refer to Field of View, D: S and other instructions in this manual. |
| Inaccurate probe measurement | Probe damage, insert the probe less than 12.7mm into the measured object | Repair the probe if it is damaged. |
Notice for Use
Infrared measurement:
- If the ambient temperature changes (e.g., from indoor to outdoor), the thermometer should be allowed at least 30 minutes to stabilize, otherwise error may be caused.
- If there is dust or foreign matter on the lens of the infrared sensor, clean the lens according to the method (8. Maintenance and Cleaning) and continue to measure after the lens surface is dry.
- Make sure there are no other obstacles between the product and the measured object.
Probe measurement:
- The probe has a minimum penetration depth of 12.7mm.
- Do not use the product in corrosive acids or alkalis.
UNI-TREND TECHNOLOGY (CHINA) CO., LTD
. No.6, Gong Ye Bei 1st Road, Songshan
Lake National High-Tech Industrial
Development Zone, Dongguan City,
Guangdong Province, China
Documents / Resources
 |
UNI-T UT320T 2 In 1 Thermometer [pdf] User Manual UT320T, 2 In 1 Thermometer, UT320T 2 In 1 Thermometer, Thermometer |