UNI-T UT321 Digital Thermometer Instruction Manual

UT321 Digital Thermometer
Instruction Manual

Safety Information

The Uni-Trend Model UT321, UT322, UT323 and UT325 Thermometers (‘the thermometer) are microprocessor-based, digital thermometers designed to use external J-, K-, T-, E-, R-, S- and N- type thermocouples (temperature probes) as temperature sensors.

• UT321: T1, suitable for K-, J-, T- and E- type thermocouples
• UT322: T1 and T2, suitable for K-, J-, T- and E- type thermocouples
• UT323: T1, suitable for K-, J-, T-, E-, R-, S- and N- type thermocouples.
• Equipped with over limit alarm, over limit signal output and user self-debug features.
• UT325: T1 and T2, suitable for K-, J-, T-, E-, R-, S- and N- type thermocouples.
• Equipped with over limit alarm, over limit signal output and user self-debug features.

Use the thermometer only as specified in this manual. Otherwise, the protection provided by the meter may be impaired.
Refer to safety information in Table 1 and the international symbols in Table 2.
Table 1. Safety Information
Warning
A warning identified conditions and actions that pose hazards to the user. To avoid electrical shock or personal injury, follow these guidelines:

• Before using the thermometer inspect the case. Do not use the thermometer if it appears damaged. Look for cracks or missing plastic. Pay particular attention to the insulation around the connectors.
• Disconnect the thermocouple(s) from the thermometer before opening the case.
• Replace the batteries as soon as the battery indicator ( ) appears. The possibility of false readings can lead to personal injury.
• Do not use the thermometer if it operates abnormally. Protection may be impaired.
• When in doubt, have the thermometer serviced.
• Do not operate the thermometer around explosive gas, vapor, or dust.
• Do not apply more than the rated voltage, as marked on the thermometer (30V|), between the thermocouple(s), or between any thermocouple and earth ground.
• When potential differences are anticipated between the thermocouples, use electrically insulated thermocouples.
• When servicing the thermometer, use only specified replacement parts.
• Do not use the thermometer with any part of the case or cover removed.

Caution

• A caution identifies conditions and actions that may damage the meter or the equipment under test.
• Use the proper thermocouples, function, and the range of your thermometer.
• When carrying two thermocouples measurement, make sure there are no potential differences between two thermocouples.
• Do not attempt to recharge the battery.
• Match the + and – polarities of the battery with the battery case.

Table 2. International Symbols

| Refer to the manual for information about this feature
---|---
****| Complies with European Union directives
| Battery

Getting Started

Everything in this Users Manual applies to all Models of UT321, UT322, UT323 and UT325 unless otherwise indicated.
To become familiar with the thermometer, study the following:

• Figure 1 and Table 3 describe the components
• Figure 2 and Table 4 describe the display.
• Figure 3-a and 3-b and Table 5 describes the functions of the buttons.

Then read the following sections.
Components
Table 3. Components

Display Elements Table 4. Display Elements

fixed.
10| Secondary Display 2
11| The thermocouple measurement includes an offset.  See “Changing Setup Options”
12| Readings are being logged when the icon blinks
13| Primary Display
14| The displayed readings do not change
| The symbol of display backlight

Buttons

Table 5. Buttons

| Press to turn the thermometer on or off
---|---
| Press to turn the display backlight on and off.
HOLD| Press to freeze or unfreeze the displayed readings
ºC ºFK| Press to switch between Celsius (ºC), Fahrenheit(ºF), and Kelvin (K)
MAX MIN| Press to step through the maximum, minimum, and average readings. Press and hold to turn off this display.
TYPE (UT321/UT323)| Press to step through K-, J-, T-, E- (R-, S-, N-) type thermocouple.
T1 T2 T1-T2 (UT322/UT329)| Press to toggle showing the T1, T2 and T1-T2 (differential temperature measurement) in the primary or secondary display 1
SEND| Press to enter USB mode and the USB icon  blinks.  Press again to exit USB mode.
STORE| Press to start or stop logging. (See “Using Memory – Starting and Stopping Logging”.)
RECALL| Press to show logged readings Press again to stop.
SETUP| Press to start or exit Setup.
Press to scroll the Setup option you want to change (See “Changing Setup Options”)
| After entering the Setup mode, press to increase the displayed setting.
(See “Changing Setup Options”)
| After entering the Setup mode, press to decrease the displayed setting.
(See “Changing Setup Options”)
ENTER| Confirm button.
(See “Changing Setup Options”)

Using the Thermometer

1. Plug the thermocouple(s) into the input connector(s).
2. Press the power button to turn on the thermometer.
3. Set the type of thermocouple(s) to be same of the type plug into the input connector(s).
   If no thermocouple is plugged into the selected input or the thermocouple is “open” and the over-range positive deviation is too big, the display shows “ “.
   Changing Setup Options
   Use Setup to change the following settings:
   Logging interval Thermocouple type Offset (T1) Offset (T2) (UT322 and UT325 only) Sleep Mode Line Frequency Time (S-T) Low Limit Alarm (Lo) (UT323 and UT325 only) High Limit Alarm (Hi) (UT323 and UT325 only)  Over Limit Signal Output (SI) ON/OFF (UT323 and UT325 only) Normal Temperature Compensation (NTC) ON/OFF DEBUG   ON/OFF (UT323 and UT325 only)   Save setting and return to normal measurement mode.
   Entering and Exiting Setup
   When the thermometer is in Setup mode, the display shows and blinks SETUP.

• Press SETUP to start or exit Setup.
• Press SETUP to scroll the Setup option you want to change after

Changing the Logging Interval
The logging interval determines how often the thermocouple stores logged readings in memory. You choose the length of the logging interval. See “Using Memory”.
Press SETUP until the display shows INTERVAL.
The thermometer stores logged readings at the end of each logging interval. You can select a logging interval by pressing . Holding down causes the number to change more quickly. The maximum interval is 59:59 and the minimum interval is 00:00. When the logging interval is 00.00, you need to store the readings manually as the auto store feature will be disabled.
Changing the Thermocouple Type

1. Press SETUP until the display shows TYPE.
2. Press to select the thermocouple type you want including K-, J-, E- type (UT323 and UT325 have extra R-, S- and N- type).

Changing the Offset (T1)

1. Press SETUP until the display shows OFFSET and T1
2. Press until the display shows the correct reading. The offset readings range

Changing the Offset (T2)

1. Press SETUP until the display shows OFFSET and T2
2. Press until the display shows the correct reading. The offset readings range
   

Sleep Mode

1. Press SETUP until the display shows SLP.
2. Press Aor Vas need until the display shows the correct sleep mode time you want, it is between 5-60 minutes.
3. Holding down causes the time to change more quickly.
4. When the sleep mode time is less than 5 minutes, the display shows OFF which means disabling the sleep mode.

Changing the Line Frequency

1. Press SETUP until the display shows LINE.
2. Press to select 60Hz or 50Hz.

Setting the Time

1. Press SETUP until the display shows S-T.
2. Press ENTER to toggle between minutes: second (m:s) and hour: minutes (h:m).
3. Press until the display shows the correct time. The time is 24- hour format.
4. Holding down causes the number to change more quickly.
5. The system time is the current meter running time if there is no changing on this setup option.
6. The system time is counted when the user turning on the thermometer. It zeros automatically when the electricity is cut.

Setting the Low Limit Alarm (Lo) ((Only UT323 and UT325)

1. Press SETUP until the display shows Lo.
2. Press until the display shows the correct low limit alarm.
3. Holding down causes the number to change more quickly
4. Press ENTER to turn the low limit alarm off, the display shows OFF. Press ENTER again to turn the low limit alarm on, the display shows the low limit alarm reading.
5. When the tested temperature is over the limit, the thermometer beeps
6. The minimum reading of low alarm is the minimum measuring range of each type of thermocouple,
7. The maximum reading of the low alarm is either the high alarm reading minus 1 or the maximum reading of measuring range of each type of thermocouple.
   For example:

   The minimum reading of the low alarm of K type is -200°C.
   The maximum reading of the low alarm of K type is either the high alarm reading minus 1 or +1372°C

Below table shows the measuring range of each type of thermocouple
K type: -200.0ºC to +1372ºC (-328.0 ºF to +2501 ºF)
J type: -210.0ºC to +1200ºC (-346.0 ºF to +2192 ºF)
T type: -250.0ºC to +400.0ºC (-418.0 ºF to +752.0 ºF)
E type: -150.0ºC to +1000ºC (-238.0 ºF to +1832 ºF)
Setting the High Limit Alarm (Hi) (Only UT323 and UT325)

1. Press SETUP until the display shows Hi..
2. Press until the display shows the correct high limit alarm.
3. Holding down causes the number to change more quickly
4. Press ENTER to turn the high limit alarm off, the display shows OFF. Press ENTER again to turn the high limit alarm on, the display shows the high limit alarm reading.
5. When the tested temperature is over the limit, the thermometer beeps
6. The maximum reading of high alarm is the maximum measuring range of each type of thermocouple,
7. The minimum reading of the high alarm is either the low alarm reading plus 1 or the minimum reading of measuring range of each type of thermocouple. .

For example:
The maximum reading of the high alarm of K type is +1372ºC.
The minimum reading of the high alarm of K type is either the low alarm reading plus 1 or -200ºC.
Below table shows the measuring range of each type of thermocouple
K type: -200.0ºC to +1372ºC (-328.0ºF to +2501ºF)
J type: -210.0ºC to +1200ºC (-346.0ºF to +2192ºF)
T type: -250.0ºC to +400.0ºC (-418.0ºF to +752.0ºF)
E type: -150.0ºC to +1000ºC (-238.0ºF to +1832ºF)
Enabling or Disabling Over Limit Signal Output (Only UT323 and UT325)

1. Press SETUP until the display shows SI.
2. Press to turn the over limit signal output on or off. The display shows on or oFF.
3. After setting the high or low limit alarm and turning on the over limit signal output, the SIGN port of the thermometer will output the corresponding signal if the tested temperature is over or under the high or low limit. When the tested temperature is over the high limit, the SIGN port will output the high electric level signal. When the tested temperature is under the low limit, the SIGN port will output around 10Hz pulse signal.

Enabling or Disabling Normal Temperature Compensation (NTC)

1. Press SETUP until the display shows NTC.
2. Press to turn normal temperature compensation on or off. The display shows

Enabling or Disabling Debug (Only UT323 and UT325)

1. Press SETUP until the display shows DEBUG.
2. Press to turn Debug on or off. The display shows on or oFF. The thermometer is default as oFF.
3. You can self-debug the thermometer when the Debug feature is turned on. (Refer to Measuring Temperatures — Debug)

Measuring Temperatures

Connecting a Thermocouple
Thermocouples are colour coded by type based on the North American ANSI Colour Code:

1. Plug a thermocouple into the input connector(s).
2. Set the thermometer for the correct thermocouple type.

To change the thermocouple type, see “Changing Setup Options”.

Displaying Temperatures

1. Press °C °FK to select the correct temperature scale.
2. Hold or attach the thermocouple(s) to the measurement location. The temperature reading appears in the selected display

Holding the Displayed Temperatures

1. Press HOLD to freeze the readings on the display. The display shows HOLD.
2. Press HOLD again to turn off the HOLD function.

Turning on and off of display backlight

1. Under temperature measurement mode, press to turn the display backlight on.
2. Press again to turn off the display backlight. The display backlight will not automatically off.

Viewing the MIN, MAX, and AVG Readings

1. Press MIN MAX to step through the maximum (MAX), minimum (MIN), or the average (AVG) readings.
2. Press and hold MIN MAX to exit MIN MAX mode.

Using the Offset to Adjust for Probe Errors
Use the offset option in Setup to adjust the thermometer’s readings to compensate for the errors of a specific thermocouple.

1. Plug the thermocouple into the input connector.
2. Place the thermocouple in a known, stable temperature environment (such as an ice bath or a dry well calibrator).
3. Allow the readings to stabilize.
4. In Setup change the offset until the display reading matches the calibration temperature. (See “Changing Setup Options.”)

Over Limit Alarm (Only UT323 and UT325)
Setting the low alarm and high alarm limit at the SETUP mode, the thermometer beeps when the measured temperature is higher or lower than the pre-set limit. (See “Changing Setup Options.”)
Over Limit Signal Output (Only UT323 and UT325)
Setting the low and high limit signal output at the SETUP mode, the SIGN port output the corresponding signal when the measured temperature is higher or lower than the pre-set limit. (See “Changing Setup Options.”)
Debug (Only UT323 and UT325)
After entering the Debug mode, you can self-debug. Below is the procedure:
• Debug point:

• Debug method:

1. Connect T1 and T2 to standard voltage source.
2. Standard voltage source input the corresponding voltage of debug point.
3. Press HOLD to freeze the debug data.
4. Normal Temperature debug:
   Press MAX MIN when the thermometer is at Debug mode, secondary display 1 shows the offset reading. Secondary display 2 shows the normal temperature.
   Press to adjust the offset reading, the offset range is -6–+6.

Remark:
The corresponding table between temperature and voltage refer to BS EN 605841:1996. Before carrying out debug, to ensure your standard source has enough accuracy. It is at your own responsibility, if the thermometer has too big accuracy deviation is caused by the standard source does not have enough accuracy.
Using Memory
During a logging session, the thermometer stores logged readings in its memory.
The thermometer stores 00-99, total 100 sets of temperature readings. The stored readings are from primary display.
Starting and Stopping logging

1. Set the logging interval. (See “Changing Setup Options.”)
2. Press STORE to start logging. The display blinks DATA.
3. Press STORE again to stop logging.
4. If you selected a manual logging interval, set the logging interval as 00:00. Press ENTER each time you want to store logged readings in memory. The secondary display 1 shows the logged reading. Each presses of ENTER will automatically store the logged readings in the next memory location. Press could change the memory location, the empty location shows “- – – – – ”.
5. If you selected an auto logging interval, set the logging interval not 00:00. After entering logging mode, the secondary display 2 shows “:” Press ENTER to start storing readings in sequence according to the pre-set logging interval, the “:” blinks. Press ENTER again to pause auto logging, the “:” stop blinking. Press ENTER again to resume logging, the “:” blinks again.

Viewing Logged Readings

1. Press RECALL to view logged readings. The display shows RCL and blinks.
2. Press to scroll through the logged readings, the default reading is the last stored reading when exiting the logging. The recalled reading will automatically toggle to the measurement unit when logging.
3. The logged readings will automatically toggle to the temperature unit during logging.
4. The secondary display 1 shows its memory location. The secondary display 2 shows its time stamp. The primary display shows each logged reading.
5. Press ENTER causes the readings to change more quickly until memory location reaches 99.

Clearing Memory

1. Press STORE to enter logging mode, the display shows DATA and blinks.
2. Press and hold down STORE 2 seconds, the display shows CLR.
3. Press ENTER to delete all the logged readings from memory. It is not possible to delete the logged readings one by one.
   The display then shows “—-“

Communicating with a PC
You can transfer the contents of the thermometer’s memory to a PC using the included Software.
Press SEND button and USB blinks on the display. It means the thermometer and the PC are connected correct. Details refer to the Installation Guide file in the Software.
Under the influence of radiated Radio-Frequency electromagnetic Field phenomenon, the captioned model have a measurement error, it will be back to normal when the interference is removed.

Maintenance

Replacing the Battery
Replace the batteries as soon as the battery indicator appears. The possibility of false readings can lead to personal injury.

1. Turn off the thermometer.
2. Loosen the screw and remove the battery door.
3. Replace 1 piece of 9V battery (6F22). Replace the battery door and tighten the screw.

Cleaning the Case
Use soap and water or mild commercial cleaner. Wipe with a damp sponge or soft rag.

Specifications

Environmental

Operating Temperature| -10ºC to 50ºC
(14ºF to 122ºF)
---|---
Storage Temperature| -40ºC to + 60ºC
(-14ºC to +140ºC)
Humidity| Non condensing <10ºC (<50ºF)
95% RH: 10ºC to 30ºC (50¨ºF to 86ºF)
75% RH: 30ºC to 40ºC (86ºF to 104ºF)
45% RH: 40ºC to 50ºC (104ºF to 122ºF)

Genarel

Electrial

Function| UT321| UT322| UT323| UT325| Input Protection
---|---|---|---|---|---
Type| K, J, T, E| K, J, T, E, R, S, N| 30V
Input| T1| T1, T2| T1| T1, T2
Measurement
Range| K type: -200.0°C to +1372°C (-328.0 °F to +2501 °F)
J type: -210.0°C to +1200°C (-346.0 °F to +2192 °F)
T type: -250°C to +400.0°C (-418 °F to +752.0 °F)
E type: -150.0°C to +1000°C (-238.0 °F to +1832 °F)
Display
Resolution| 0.1°C °F/K…. (<1000) (T type below -200°C and R
type, S type is 1°C °F/K)
1.0°C °F/K…. (>1000)
Measurement
Accuracy| ±(0.5%+0.8°C(1.6°F))| K-,J-,T-, E- type:
±(0.2%+0..6°C(1.2°F))
R,S type: ±(0.2%+2°C(4°F))
N type: ±(0.2%+1.5°C(3°F))
Function| UT321 ……………………..UT322| UT323 ………………….UT325| Input Protection
---|---|---|---
Measurement Accuracy| Below -10°C: add 0.5°C
Below -200°C, add +2°C
Type T Below -200°C: for reference only.| 30V
Sampling Rate| 50 times per second, Updates 2-3 times per second
Time| Relative Time
Data Store| 0 – 99 sets
Setup| Logging Interval, Thermocouple Type, Offset (T1), Offset (T2) (UT322 and UT325 only), Sleep Mode, Line Frequency, Time, High/Low Limit (UT323 and UT325 only), Over Limit Signal Output (UT323 and UT325 only), Normal Temperature Compensation, Debug (UT323 and UT325 only)
Over Limit Alarm| N/A| Yes
Over Limit Signal| N/A| Yes
Power| One piece of 9V (NEDA1604 or 6F22 or 006P)

Accuracy is specified for ambient temperatures between 18ºC(60ºF)and 28ºC (82ºF) for a period of 1 year, operating temperatures: -10ºC ~ 50ºC (14ºF ~122ºF). The above specifications do not include thermocouple error,probe tolerance is not included in above technical index.

Copyright 2008 Uni-Trend Group Limited.
All rights reserved.
Manufacturer:
Uni-Trend Technology (Dongguan) Limited
Dong Fang Da Dao
Bei Shan Dong Fang Industrial Development District
Hu Men Town, Dongguan City
Guang Dong Province
China
Postal Code: 523 925
Headquarters:
Uni-Trend Group Limited
Rm901, 9/F, Nanyang Plaza
57 Hung To Road
Kwun Tong
Kowloon, Hong Kong
Tel: (852) 2950 9168
Fax: (852) 2950 9303
Email: info@uni-trend.com
http://www.uni-trend.com
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