I. Preface
Dear users
：
Congratulations on your purchase of UNI-T UT261B Phase Sequence and Motor Rotation Indicator. To
operate the instrument correctly, please read this Manual carefully and especially its “Safety Information”
before use.
After reading it, you are recommended to keep the manual properly. Please keep it with the instrument
together or place it in an accessible location for future use.
II. Overview
UT261B Phase Sequence and Motor Rotation Indicator (hereinafter referred to be as UT261B) is a
handheld battery powered instrument, widely used to identify phase orientation of three-phase industrial
equipments and motor rotation direction.
III. Unpacking Inspection
IV . Safety Information
Caution:
Specifies the conditions and actions that may cause damage to UT261B.
Warning:
Specifies the conditions and actions that may pose hazards to the User.
To prevent electric shocking or fire, it is necessary to comply with the following codes:
It is required to read through following safety instructions prior to operation or maintenance
；
Comply with local and national safety codes;
It is required to use personal protective equipments;
It is required to operate the instrument as per the instructions of manufacturer, or otherwise the safety
features/protective measures provided by the instrument may be affected;
Inspect the insulator of testing lead for damage or exposed metal; inspect testing lead for continuity
and replace the damaged testing lead.
Please take extreme caution when working with voltage higher than 30Vacrms, 42Vac Peak or 60Vdc,
for it may pose electric hazard.
Keep finger away from alligator clip contact and behind the finger protection device when using
alligator clip.
Adverse impact will be caused to the measurement by the impedance generated by the transient
current of extra operating circuit in parallel;
Please ensure the instrument operates normally prior to measuring dangerous voltage (30V ac rms,
42 V AC peak value or 60 V DC above)
Testing time should not exceed 10min when measuring the voltage 500V ~ 600V AC above;
Do not operate UT261B when removing any part;
Do not operate UT261B around explosive gas, steam or dust;
Do not operate UT261B in a wet place;
It is required to remove testing lead from the power and UT261B prior to replacing the battery.
V. Functional Description
5.1 Symbols
Following symbols are applied on UT261B or in the manual.
CAT III
Risk of electric shock
Warning
Dangerous voltage
Double or reinforced insulation
Grounding
AC or DC
Comply with European Union directives
Conforms to Overvoltage Category III, Pollution Degree 2 as per
IEC61010-1. CATIII refers to the degree of protection against the
transients and usually includes the equipments in fixed installations
(eg: electricity meter and primary overcurrent protection device).
5.2 Instrument Description
See the instrument indicator, button and jack as shown in Figure 1:
Graphical description
Phase input jack (U, V, W);
L1, L2, L3 phase indicators;
Clockwise rotation LED indicator;
Counter-clockwise rotation LED indicator;
Power switch
Motor location indicator
Power LED indicator
Instruction Table
Check the product for any crack or scratch. If any item is missing or damaged, please contact nearby
UNIT service center.
Standard items included in the shipment:
The Instrument-----------------------------1 pc
Operating Manual-------------------------1pc
Test Leads----------------------------------3pcs
Alligator Clips-------------------------------3pcs
Carrying Bag--------------------------------1pc
9V Battery------------------------------------1pc
