Figure 1
5.3 Operating Instruction
5.3.1 Determine Phase Sequence (Contact Type)
5.3.2 Check Rotary Field (Motor Rotation, Non-Contact Type)
Note: This non-contact test is applicable for both
single-phase and three-phase motors. The
instrument will be unable to indicate accurately
with motors controlled by frequency converter,
its LED indicators can not work normally.
Figure 2
Figure 3
R LED indicator is on when the motor
otates clockwise.
5.4 Detect Magnetic Field
Place UT261B into solenoid valve, press “ON” button. If “Clockwise” (R) or “Counter-clockwise” (L) rotation
indicator illuminates, indicating magnetic field exists in the area.
Do not use corrosive or solution since those substances will cause damage to the chassis
of UT261B.
Prior to cleaning, remove all testing leads from UT261B.
VI. Maintenance
Note
To prevent damage to UT261B:
Repairing or Maintaining UT261B can only be performed by qualified technicians.
Make sure you know clearly precise calibration procedures and function tests, and read enough
maintenance information
．
Replacement and disposal of battery
Note, Warning
To prevent electric shocking, it is necessary to remove all testing leads from UT261B prior to replacing
replace the battery.
UT261B contains 9V/6F22 battery, do not discard the battery with other solid wastes and the used
battery should be handed over to the qualified waste collector or dangerous substance transporter for
proper treatment and disposal.
Please replace the battery as follows and see the Figure 3:
1. Remove all testing leads from UT261B.
2. Take off the protective casing.
3. Place UT261B with face down on the non-abrasive surface, and
screw out screws on
the battery cover with proper screw driver.
4. Take off battery cover from UT261B and take out battery after
loosening the battery buckle.
5. Replace battery as per the method shown in the figure,
and watch out for the battery polarity.
6. Reinstall the battery cover with screws.
The manual information is subject to changes without prior notice!
**END**
a. Insert test leads (L1,L2,L3) into the corresponding input terminals of UT261B(U,V,W) respectively and
then connect them to alligator clips.
b. Then connect alligator clips in L1, L2 and L3 order to three phases of the system (eg: U,V and W terminals
of three-phase instrument).
c. Press down “ON” button, UT261B power indicator illuminates, release it, the button springs up automati
-cally and the indicator turns off. Therefore you need to press down “ON” button in order to begin the test.
When ON is pressed down, “Clockwise” (R) or “Counter-clockwise” (L) rotation indicator illuminates,
indicating three-phase system is under “Positive” or “Negative” phase sequence.
a. Remove all test leads away from UT261B;
b. Place UT261B towards the motor, in parallel with motor shaft. The bottom of the instrument should face the
shaft (namely, UT261B is located in a direction contrary to that of the motor). Refer to Figure 1 for motor
location indicator.
c. Press “ON” button, power indicator illuminates and the test begins. “Clockwise” (R) or “Counter-clockwise”
(L) rotation indicator illuminates, indicating the motor is rotating in a “clockwise” or “counter-clockwise”
direction.See Figure 2 for details.
Altitude
Pollution Degree
Mechanical
Safety
Compliances
Rating
test current
rotating
direction value
range
test current
III
P/N:110401104488X DATE:2018.06.26 REV.3
