UNI-T | UT25B | manual | UNI-T UT25B AC Circuit Breaker Finder Manual

UNI-T UT25B AC Circuit Breaker Finder Manual
P/N:110401105608X DATE:2018.06.26 REV.2
UT25A, UT25B, UT25A/B
Operations Manual
UT25A, UT25B as circuit breaker finder/receiver
UT25A/B as socket tester/transmitter
Overall Appearances of Circuit Breaker Finder &
GFCI Socket Tester:
When this symbol appears, the operator should refer to the
Operations Manual to avoid personal injury or damaging the
Working voltage --------------------------------- 110-125V
Operating frequency --------------------------- 50-60Hz
Fuse ------------------------------------------------ 1A, 250V, Ø4x11mm
When this symbol appears, it hints that there is potential danger
which might damage the product if the danger is not avoided.
WARNING: If the equipment is used in a manner not specified by the
manufacturer, the protection provided by the equipment may be impaired.
Conforms to UL STD. 61010-1, Certified to CSA STD C22.2 NO.
NCV working voltage----------------- 80V(only for UT25B)
Operating voltage--------------------- 90-120V
Operating frequency----------------- 50-60Hz
Power------------------------------------ 9VDC, battery type 1604/6F22
Operating temperature-------------- 41'F - 104 'F (5'C - 40'C)
Storage temperature----------------- 4'F - 140'F (-20'C - 60'C)
Operating humidity------------------- at most 80% at temperature of 87'F (31 'C) to
50% at temperature of 104'F (40 'C) Storage
humidity--------------------------------- <80%
Operating altitude-------------------- 7000 feet (2000m) at most
Product weight------------------------ 133g (UT25A, UT25B)
80g (UT25A/B)
Product size--------------------------- L:192xW:54xH:28mm (UT25A, UT25B)
L:103xW:56xH:30mm (UT25A/B)
Product certification------------------ ETL
ETL list---------------------------------- ETL mark does not indicate the accuracy of
estimated readings
Warning: Make sure that the circuit
is functioning properly before using.
Warning: Make sure the user
understands about the equipment.
1. NCV indicator light (only for UT25B)
2. LED indicator light with line-tracking
3. ON/OFF switch that can also adjust sensitivity
4. 9VDC, battery type 1604/6F22
Attention: The battery information on the battery compartment and the
method of opening the battery compartment
5. GFCI test button
6. Indicator light description
7. LED status indicator
Product Specification for UT25A/B
When this symbol appears, it hints that there could be potential
danger which might lead to severe injury or death or if the danger is
not avoided.
Product Specification for UT25A and UT25B
Product Description
6. When moving the receiver, the sensitivity can be reduced to find
the exact circuit breaker of interest.
Find the location of circuit breaker or
circuit protector on the power frequency
circuit loop, the transmitter will then
send out a signal which will be received
by the receiver. The receiver will detect
this signal which is making beeping
sounds, the exact position of circuit
breaker or circuit protector can be found (Detection Image of Receiver)
by adjusting the sensitivity.
1. Plug the receiver into a live socket; two green LEDs will shine.
2. Unscrew the sensitivity adjusting knob on the receiver from the close position to
the highest position, the red LED will be turned on. If the red LED did not turn on,
please change the battery. It is also necessary to change the battery if the NCV
indicator light and line-tracking light are both blinking (only for UT25B).
3. During the testing process, when the receiver is close to the transmitter, the
receiver will make beeping sounds and the LED will blink. UT25B (only) will
firstly determine if there is electricity or not. If there is an AC voltage higher
than 80V, the NCV indicator light will blink and make beeping sounds. When it
detects signal sent out by the transmitter, it will automatically test the
line-tracking function.
4. On the circuit breaker panel, adjust the sensitivity to the highest position, hold
the receiver and detect from top to bottom, as shown in the figure above.
5. Along with the surface of circuit breaker, move the receiver until it detects the
portion of interest.
Indicator Light Description:
CORRECT WIRING --------------------------------------------GFCI TESTING IN PROGRSS ------------------------------HOT ON NEU WITH HOT OPEN --------------------------HOT&GND REV -----------------------------------------------HOT&NEU REV -----------------------------------------------OPEN HOT -------------------------------------------------------- 000
OPEN NEU -------------------------------------------------------OPEN GND -------------------------------------------------------O OFF • ON
1. Plug the transmitter into the socket.
2. The operator can determine the status of circuit connection according to the 3
LEDs. The picture above shows all of the circumstances that can appear on
the detected circuit. The picture is observed from the side of GFCI buttons. If
it is observed from the other side, the order of LED indicator lights will be
3. This equipment cannot detect the ground connection if there are 2 hot
wires, a combination circuit, or the ground and neutral wires are reversed.
GFCI Test on Socket:
1. Before using this equipment, press GFCI button to check if it can return to
the original position. If not, please do not plug the equipment into electrical
circuit, and ask for a professional electrical engineer for help. If the button
works, please press the button on the socket.
2. Plug the transmitter into socket and check if the circuit is connected correctly.
3. Press GFCI button for at least 8 seconds, the indicator light will be turned
off when the GFCI button is released.
4. lf the circuit did not reset the GFCI button, it could be that the GFCI button is
correct, but the wire connection is not. Or it could be that the wire connection
is correct, but the GFCI button is not.
Changing Battery:
1. When the battery voltage is lower than the working voltage, the indicator
lights on the receiver will not be turned on, please change the battery. If the
NCV indicator and the line-tracking lights are both blinking (only for
UT25B), please change the battery as well.
2. Slide open the battery cover according to the arrow direction on the battery
cover and take out the used battery.
3. lnstall a new 9V battery while paying close attention to the battery polarity.
4. Close the battery cover.
5. Put the used battery in a special battery disposal area.
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