UEi DT720 User manual

DT720 Digital thermometer
EXIT
ENTER
CLEAR
T1-T2
MIN/
MAX
RECALL
SETUP
HOLD
LOG
TYPE
K
T1
T1 - T2
T2
m:s
ºF
INSTRUCTION MANUAL
ENGLISH
Digital Temperature Logger
DT720
1-800-547-5740
www.ueitest.com • email: [email protected]
ISED

Table Of Contents
FEATURES ..............................................................................3
SAFETY NOTES...................................................................... 3
CONTROLS AND INDICATORS ..........................................4
LCD DISPLAY FUNCTIONAL DESCRIPTION ..................... 5
OVERVIEW ...........................................................................6-7
OPERATING INSTRUCTIONS.........................................7-12
1. Temperature units. ................................................. 7
2. Date .................................................................... 7-8
3. Time .......................................................................8-9
4. Type ....................................................................... 9
5. APO ....................................................................... 9
6. Interval ................................................................. 9
7. Offset ...................................................................10
8. Factory Reset .........................................................10
9. Exiting...................................................................... 10
Displaying Temperature...................................... 10-11
Holding the Displayed Temperature ........................ 11
Viewing the MIN/MAX/AVG Readings ..................... 11
Using the Offset to Compensate for Probe Errors ...11
How to Use Memory .................................................11
Starting and Stopping Logging .................................12
Clearing Memory ........................................................12
Viewing Logged Readings ......................................... 12
MAINTENANCE........................................................... 12-13
Periodic service......................................................12-13
Cleaning and Decontamination.................................. 13
Battery Replacement ..................................................13
SPECIFICATIONS............................................................15-16
Environmental .............................................................15
General........................................................................ 15
ATT29 K-Type Thermocouple...................................... 15
Electrical...................................................................... 16
FCC INFORMATION ......................................................... ..17
WARRANTY ........................................................................18

3
Features
• 2 channel
• Large backlit multi-parameter display
• Accepts J, K, E, T, R, S type thermocouples
• Min/Max/Avg
• Hold
• Auto Power Off
• Fahrenheit or Celsius scale
• Temperature differential mode (T1-T2)
• Time display
Safety Notes
These are a few common safety practices for those working
around temperature critical environments:
• Follow the manufacturer’s maintenance procedures when
servicing equipment
• Place ONLY thermocouples (type K, J, T, E, R, S) in the DT720
thermocouple ports
• Make sure your meter is set for the proper thermocouple type
you are using
• Be sure the thermocouple you use can withstand the
temperature extreme it may be exposed to in your
service task
• Properly maintain your thermometer and calibrate it regularly

4
Controls and Indicators
A. Thermocouple Inputs
B. T1-T2 (Enter)
C. Min/Max (down arrow)
D. Power, Back light
E. Recall, Setup (Exit)
F. Hold, Log (up arrow)
G. Clear (Recall/Setup & Hold/Log)
DT720 Digital thermometer
EXIT
ENTER
CLEAR
T1-T2
MIN/
MAX
RECALL
SETUP
HOLD
LOG
TYPE
K
T1
T1 - T2
T2
m:s
ºF
T1
+
T2
+
30V
MAX
(top view)
B
F
C
G
D
E
A

5
LCD Display Functional Description
A. Thermocouple type
B. SETUP: Setup in progress
C. RECALL: the logged readings are displayed.
D. OFFSET: the thermocouple measurement also includes
an offset.
E. HOLD: the display readings do not change.
F. BATTERY LEVEL
G. LOG: Readings are being logged.
H. Temperature Unit: °F, °C, K
I. Memory
J. Min/Max/Avg
K. Temperature Differential: T1-T2
L. TIME DISPLAY: Shows time duration of test or log. Format
options available in SETUP.
h:m, m:s 24 (military) time
M. APO
N. T1/T2
TYPE
K J E
T R S
MEMORY MIN MAX AVG
T1
APO
T1 - T2
h:m m:s
ºF
K
ºC
T2
SETUP OFFSET HOLD
LOG
RECALL
A
L
M
N
B C D E
F
G
I
J
H
K

6
1. POWER (BACKLIGHT)
Press and hold the “ ” button to turn the
thermometer on and off. Press the “ ” button to
turn the backlight on and off. The backlight turns off
automatically after 60 seconds without any button
pressed. If the battery is low, the backlight is disabled.
2. T1/T2/ENTER
When you press the button, the secondary display
scrolls through the differential temperature and the
internal temperature in order.
The “ENTER” function is activated in the “SETUP”
mode only.
3. MIN/MAX ( )
Press the button to step through the maximum,
minimum, and average readings in the secondary
display.
When viewing logged readings, the maximum,
minimum, and average measurements are displayed.
Press and hold the “MIN/MAX” button stop viewing
MIN/MAX readings.
The “ ” scroll function is activated in the “RECALL”
and “SETUP” modes only.
4. HOLD/LOG ( )
Press the “HOLD” button to turn the “HOLD” function
ON or OFF. Press and hold the “LOG” button to enter
LOGGING mode, press and hold the “LOG” button to
exit LOGGING mode.
The “ ” scroll function is activated in the “RECALL”
and “SETUP” modes only.
5. LOGGING CLEAR
Press the “RECALL” and “HOLD” buttons
simultaneously displays “SUrE”.
Then, if you press the “ENTER” button, “CLr” is
displayed and the logging data is cleared.
If you press any button other than the “ENTER” button,
“Clear” is canceled.
6. RECALL SETUP (EXIT)
Press the button to recall or stop viewing logged and
MIN/MAX readings. Press and hold the button for more
MIN/
MAX
HOLD
LOG
HOLD
LOG
ENTER
T1-T2
EXIT
RECALL
SETUP
EXIT
RECALL
SETUP
&
Overview

7
EXIT
RECALL
SETUP
than 1 second to start or exit “SETUP”.The “EXIT” function
is activated in the “RECALL” and “SETUP” mode only.
7. RECALL
Press the “RECALL” button to enter the recall mode.
Press the “HOLD ( )” button to move to the next address
and press the “MIN/MAX ( )” button to move to the
previous address.
In Recall mode, press and hold “MAX/MIN” to step through
the recorded readings of min, max and average. Press the
“HOLD ( )” or “MIN/MAX ( )” button to exit the MIN/
MAX/AVG mode of the Recall mode.
Press “RECALL” button to exit Recall mode.
Operating Instructions
Before Operating
1. Plug the thermocouple(s) into the input terminal(s).
2. Press “ “ to turn the instrument on. After 1 second, the
thermometer displays the first reading and its differential
temperature. If no thermocouple is plugged into the selected
input or the thermocouple is “OPEN”, the display shows “----”.
How to Change Setup Options
Use “SETUP” to reset the thermometer or change the
temperature units, time units, time settings, thermocouple type,
Auto-Power-Off mode, logging interval, and offset.
Entering and Exiting Setup
1. Temperature units.
If you press the “ENTER” button while the “Unit” icon is
blinking, “C” (or F, K) will blink. With “C” (or F, K) blinking,
use the “ ”, “ ” buttons to change and press the “ENTER”
button to save the changed value. If you do not want to save the
changed value, press the “EXIT” button.
2. Date If you press “ ” while the “Unit” icon is blinking, “dAtE”
blinks. Press “ENTER” button while “dAtE” blinks. Then press
“ ” or “ ” button to move to “YEAr”, “ Mon”, “dAtE”.
Year
Press the “ENTER” button while the “YEAr” icon blinks.
Change the year with “ ” or “ ” button while “20YY” is blinking.
Press the “ENTER” button to save the changed value. If you do
not want to save the changed value, press the “EXIT” button.

8
Month
Press the “ENTER” button while the “Mon” icon blinks.
Change month with “ ” or “ ” button while “MM”:dd
is blinking.
Press the “ENTER” button to save the changed value. If you do
not want to save the changed value, press the “EXIT” button.
Date
Press the “ENTER” button while the “dAtE” icon blinks.
Change the date with the “ ” or “ ” button while mm:”DD”
is blinking.
Press the “ENTER” button to save the changed value. If you do
not want to save the changed value, press the “EXIT” button.
3. Time
While the icon at the top of the LCD is blinking, press the “ ”,
“ ” buttons to move to the “tIME” item.With the “tIME” icon
blinking, press the “ENTER” button.
Press “ ”, “ ”button to move to “UnIt”, “Hour”, “ Min”, “
SEC” item.
Press the “ENTER” button to save the changed value. If you do
not want to save the changed value, press the “EXIT” button.
Unit (“h:m”, “m:s”)
Press the “ENTER” button while the “Unit” icon blinks.
While “h:m” or “m:s” is blinking, press the “ ”, “ ” buttons
to change.
Press the “ENTER” button to save the changed value.If you do
not want to save the changed value, press the “EXIT” button.
Hour
Press the “ENTER” button while the “Hour” icon blinks.
Press the “ ” or “ ” button to change the time while
“HH”:mm is blinking.
Press the “ENTER” button to save the changed value. If you do
not want to save the changed value, press the “EXIT” button.
Minute
Press the “ENTER” button while the “Min” icon blinks.
While hh:”MM” is blinking, press the “ ” or “ ” button to
change the minute.
Press the “ENTER” button to save the changed value. If you do
not want to save the changed value, press the “EXIT” button.
Second
Press the “ENTER” button while the “SEC” icon blinks.
Press “ ” or “ ” button to change seconds while “SS”
blinks.

9
Press the “ENTER” button to save the changed value. If you do not
want to save the changed value, press the “EXIT” button.
4. Type
While the icon at the top of the LCD is blinking, press the “ ”,
“ ” buttons to move to “tYPE”.
Press the “ENTER” button while the “tYPE” icon blinks. Change
the type by pressing the “ ”, “ ” button while the “ K “ (or
J, E, t, r, S) icon is blinking.
Short press the “ENTER” button to save the changed value.
If you do not want to save the changed value, press the “EXIT”
button.
5. APO
While the icon at the top of the LCD is blinking, press “ ”,
“ ” buttons to move to “APO”.
Press the “ENTER” button while the “APO” icon blinks.
While “On-1” (or ~ On-9, oFF) is flashing, use the “ ”, “ ”
buttons to change the content.
Press “ENTER” button to save the changed value. If you do not
want to save the changed value, press the “EXIT” button.
* On-1: 10min, On-2: 20min ~ On-9: 90min, Off
6. Interval
While the icon at the top of the LCD is blinking, press the “ ”,
“ ” buttons to move to “Int.V”.
With the “Int.V” icon blinking, press the “ENTER” button.
While the “In-1” (~In-4, uSEr, oFF) icon is blinking, press the
“ ”, “ ” buttons to change the content.
User setting: 00:00 00 ~ 23:59 59 (23 hours 59 minutes 59 seconds)
1) Press the “ENTER” button while the “uSEr” icon is blinking.
2) While the “HH” icon is blinking, press the “ ”,
“ ” buttons to change the value and then press the
“ENTER” button.
3) With the “MM” icon blinking, press “ ”, “ ” to change
the value and then press the “ENTER” button.
4) While the “SS” icon is blinking, press the “ ”, “ ”
buttons to change the value, and then press the “ENTER”
button. Press the “ENTER” button to save the changed
value. If you do not want to save the changed value, press
the “EXIT” button.
* In-1: 1sec, In-2 : 10sec, In-3 : 1min, In-4 : 10min
* User : 00:00 00~23:59 59 (00 hours 00 minutes 00 seconds to 23

10
hours 59 minutes 59 seconds)
7. Offset
While the icon at the top of the LCD is blinking, press the “ ”,
“ ” buttons to move to the “OFSt” item.
Press the “ENTER” button with the “OFSt” icon blinking.
While the “ t1 “~” t4 “ icon is blinking, press the “ ”, “
” buttons to change the value, then press the “ENTER” button.
While the “XX” icon is blinking, press the “ ”, “ ” buttons
to change the value, and then press the “ENTER” button.
* °C & K: (5.0 ~ -5.0), °F = (9.0 ~ -9.0)
8. Factory Reset
While the icon at the top of the LCD is blinking, press “ ”,
“ ” to move to “rESt”.
With the “rESt” icon blinking, press the “ENTER” button.
While the “ no “, “ YES” icon is blinking, press the “ ”,
“ ”buttons to change, then press the “ENTER” button.* After
selecting “ YES”, press “Enter” to save the factory default
status.
9. Exiting or continuing the “SETUP” menu. While the icon at the
top of the LCD is blinking, press “ ”, “ ” buttons to move to
“SUrE”.
Press “ENTER” button while “SUrE” blinks.
Press “ ”, “ ” button to change while “ no “, “ YES” blink
and press “ENTER” button.
NOTE: Press “”or “ ” to scroll to the setup option you want
Displaying Temperature
1. Press RECALL/SETUP button
Type
While the icon at the top of the LCD is blinking, press the “”,
“ ”buttons to move to “tYPE”.
Press the “ENTER” button while the “tYPE” icon blinks.
Change the type by pressing the “”, “ ”button while the “ K “
(or J, E, t, r, S) icon is blinking
Short press the “ENTER” button to save the changed value.
If you do not want to save the changed value, press the “EXIT”
button.
2. Hold or attach the thermocouple(s) to the measurement location.
The temperature reading appears in the selected display.
3. If you press the”
ENTER
T1-T2
”button, the internal temperature for T1, the

11
internal temperature for T2, and the differential temperature for
T1-T2 are shown in the secondary display in order.
NOTE: The display shows “----” when a thermocouple is not
connected. The display shows “OL “ (OVERLOAD) when the
temperature being measured is outside the thermocouple’s
valid range.
Holding the Displayed Temperature
1. Press “
HOLD
LOG
“ momentarily to freeze the readings on the display.
The display shows “ HOLD “.
2. Press “
HOLD
LOG
“ momentarily again to turn off the “ HOLD “ function.
Viewing the MIN/MAX/AVG Readings
NOTE: MIN/MAX and AVG values are captured only while this mode is
active. Exiting the MIN/MAX/AVG mode will clear all values.
1. Press “
MIN/
MAX
“ momentarily to step through the MIN (minimum), MAX
(maximum), or the AVG (average) readings in the secondary display.
The elapsed time since entering MIN/MAX mode appears with
the average reading, or the time at which the MINIMUM or
MAXIMUM occurred appears with the MINIMUM or MAXIMUM
reading on the display.
2. Press “
ENTER
T1-T2
“ momentarily to toggle showing the maximum (MAX)
of T1, T2, or T1-T2 readings and its displayed time. The minimum
(MIN) or average (AVG) reading can be displayed in the similar way.
3. Press “
MIN/
MAX
“ for more than 1 second to exit MIN/MAX mode.
Using the Offset to Compensate for Probe Errors
Use the offset option in “SETUP” to adjust temperature readings to
compensate for the errors of a specified thermocouple.
1. Plug the thermocouple into the input terminal.
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 primary display reading
matches the calibration temperature. See “How to Change
Setup Options”
How to Use Memory
The thermometer has 9,999 memory locations.
During logging session, the thermometer stores logged readings

12
in its memory. At the end of the logging session you can view the
logged readings on the display.
Starting and Stopping Logging
Recall function is enabled during logging.
1. Set the time and the logging interval, see “How to Change Setup
Options”.
2. Press “
HOLD
LOG
“ for more than 1 second to start logging. The display
shows “ LOG “.
3. Press “
HOLD
LOG
“ for more than 1 second again to stop logging.
Clearing Memory
When memory is full, logging stops. You can clear memory in normal
or MIN/MAX mode.
1. Press “
EXIT
RECALL
SETUP
“ and“
HOLD
LOG
“ buttons simultaneously display “ SUrE “.
2. Than if you press the “ENTER” button, “CLr” is displayed and the
logging data is cleared.
3. If you press any button other than the “ENTER” button, “Clear”
is canceled.
Viewing Logged Readings
1. Press “
EXIT
RECALL
SETUP
“ momentarily to display the last logged reading. If
there is no logged readings, the buzzer will sound twice.
2. Press “ ” or “ ” to scroll through the logged readings. The
display shows each logged reading and its time stamp, which is
displayed its memory location appeared in the secondary display.
3. Press “
MIN/
MAX
“ for more than 1 second to step through the minimum,
maximum, average, and currently logged reading.
4. Press “ ” or “ ” momentarily to display the logged readings
you want to view.
5. Press “
EXIT
RECALL
SETUP
“ momentarily or turn off the thermometer to stop
viewing logged readings.
NOTE: The thermometer calculates the minimum and maximum of all
logging sessions in memory.
Maintenance
Periodic service
WARNING!
Repair and service of this instrument is to be performed by qualified
personnel only. Improper repair or service could result in physical
degradation of the meter. This could alter the protection from
electrical shock and personal injury this meter provides to the

13
operator. Perform only those maintenance tasks that you are
qualified to do.
These guidelines will help you attain long and reliable service from
your meter:
1. Calibrate your meter annually to ensure it meets original
performance specifications.
2. Keep your meter dry. If it gets wet, wipe it dry immediately. Liquids
damage electronic circuits.
3. Whenever practical, keep the meter away from dust and dirt, which
can cause premature wear.
4. Although your meter is built to withstand the rigors of daily use, it
can be damaged by severe impacts. Use reasonable caution when
using and storing the meter.
Cleaning and Decontamination
Periodically clean your meter’s case using a damp cloth. DO NOT use
abrasives, cleaning solvents or strong detergents, as they may
damage
the finish or affect the reliability of the structural components.
Battery Replacement
Always use a fresh replacement battery of the specified size and type.
Immediately remove the old or weak battery from the meter and
dispose of it in accordance with your local disposal regulations. Old or
defective batteries can leak chemicals that corrode electronic
circuits.
WARNING!
To avoid electric shock, be sure to turn off the meter’s power and
disconnect thermocouples from any equipment before you remove
or install batteries.
To install a new battery, follow these procedures:
1. Remove the screws from the battery compartment cover on the
back of the meter and lift the cover.
2. Remove and discard the old batteries. Always dispose of old
batteries promptly in a manner consistent with local disposal
regulations.
WARNING!
Under NO circumstance should you expose batteries to extreme heat
or fire as they may explode and cause injury.
3. Place a fresh batteries in the compartment.
NOTE: If you do not plan to use the meter for a month or more,
remove the battery and store it in an area that won’t be damaged by
a leaking batteries.
4. Reattach the battery compartment cover to the meter and

14
IMPORTANT SAFETY WARNINGS
WARNING!
Read entire Safety Notes section regarding potential hazard and
proper instructions before using this meter. In this manual the word
“WARNING” is used to indicate conditions or actions that may pose
physical hazards to the user. The word “CAUTION” is used to indicate
conditions or actions that may
damage this instrument.
To avoid false readings, replace the batteries if a low battery indicator
appears.
WARNING!
To avoid electric shock, be sure to turn off the meter’s power and
disconnect thermocouples from any equipment before you remove or
install batteries.
WARNING!
This temperature tester is designed for trained trade professionals who
are familiar with the hazards of their trade. Observe all recommended
safety procedures and use of personal protective equipment.

15
Specifications
Environmental
Operating Temperature 32˚ to 122˚F (0˚ to 50˚C)
Storage Temperature -4˚ to 140˚F (-20 to 60˚)
Humidity Non condensing <50°F (10°C)
85% RH: 50° to 86°F (10° to 30°C)
70% RH: 86° to 104°F (30° to 40°C)
45% RH: 104° to 122°F (40° to 50°C)
General
Dimensions 6.34 x 2.95 x 1.38in (161 x 75 x 35mm)
Weight Approx. 0.63 lb (285g)
Battery 3 x AA Batteries
Certification CE, FCC, ISED, UKCA, RoHS, REACH, WEEE
Safety EN66010-1; 2010/A1 2019
CAT I OVERVOLTAGE (Installation) CATEGORY I,
Pollution Degree 2 per IEC 1010-1
ATT29 K-Type Thermocouple (a standard accessory)
Type K-Type, Chromel Alumel
Temperature range -200° to 1370°C (-328° to 2498°F)
Accuracy ±[1.0% + 0.5°C (1.0°F)]

16
Electrical
Measurement
range
J-type: -346˚ to +2192˚F (-210˚ to +1200˚C)
K-type: -328˚ to +2498˚F (-200˚ to +1370˚C)
T-type: -418˚ to +752˚F (-250˚ to +400˚C)
E-type: -238˚ to +1832˚F (-150˚ to +1000˚C)
R-type: +32° to +3200°F (0° to 1760°C)
S-type: +32° to +3200°F (0° to 1760°C)
Display Resolution 0.1˚F/˚C < 1000˚
1.0˚F/˚C ≥ 1000˚
Measurement
Accuracy
J, K, T, and E-type; ±[0.1% +1.4°F (0.8°C)]
R and S-Type ±[0.1% +3.6°F (2.0°C)]
[Below -148˚F (-100˚C): add 0.2% of reading
for J, K, and E-type; add 0.5% of reading for
R, S and T-type
Temperature
Coefficient
0.01% of reading 0.1°F per °F (+0.05°C per °C)
Coefficient for <+64°F (+18°C) or +82°F (+28°C)
[Below -148°F (-100°C): add 0.05% of reading
for J, K, and E-type; and 0.1% of reading for
R, S and T-type]
Real Time
Clock Tolerance
About 1 second per day
Maximum Dif-
ferential
Common Mode
Voltage
1V (maximum voltage difference between any
pair of inputs)
Temperature Scale ITS-90 (International Temperature Scale of
1990)
Applicable
Standards
N.I.S.T. Monograph 175 revised to ITS-90
Accuracy is specified for ambient temperatures between
64°F (18°C) and 82°F (28°C) for a period of 1 year. The above
specifications do not include thermocouple error.

FCC Information
This device complies with part 15 of the FCC Rules. Operation is
subject to the following two conditions: (1) This device may not
cause harmful interference, and (2) this device must accept any
interference received, including interference that may cause
undesired operation.
Note: This equipment has been tested and found to comply with
the limits for a Class A digital device, pursuant to part 15 of the
FCC Rules. These limits are designed to provide reasonable protection
against harmful interference when the equipment is
operated in a commercial environment.
This equipment generates, uses, and can radiate radio frequency
energy and, if not installed and used in accordance with the instruction
manual, may cause harmful interference to radio communications.
Operation of this equipment in a residential area is likely
to cause harmful interference in which case the user will be required
to correct the interference at his own expense.
WARNING Any changes or modifications not expressly approved
by the manufacturer could void the user’s authority to operate the
equipment.

Warranty
The DT720 is warranted to be free from defects in materials and
workmanship for a period of 1 year from the date of purchase. If within
the warranty period your instrument should become inoperative from
such defects, the unit will be repaired or replaced at UEi’s option.
This warranty covers normal use and does not cover damage which
occurs in shipment or failure which results from alteration, tampering,
accident, misuse, abuse, neglect or improper maintenance. Batteries and
consequential damage resulting from failed batteries are not covered by
warranty.
Any implied warranties, including but not limited to implied warranties
of merchantability and fitness for a particular purpose, are limited to the
express warranty. UEi shall not be liable for loss of use of the instrument
or other incidental or consequential damages, expenses, or economic
loss, or for any claim or claims for such damage, expenses or economic
loss.
Warranty only covers hardware and does not extend to software
applications.
A purchase receipt or other proof of original purchase date will be
required before warranty repairs will be rendered. Instruments out of
warranty will be repaired (when repairable) for a service charge.
For more information on warranty and service, contact:
www.ueitest.com • Email: [email protected]
1-800-547-5740
This warranty gives you specific legal rights. You may also have other
rights, which vary from state to state.
Copyright © 2023 Kane USA Inc. All Rights Reserved. 202224 0323