Kewtech KT72 User manual
KT72
PAT TESTER WITH AUTO
TEST SEQUENCES
•Performs Earth bond at 200mA at both +ve and -ve
polarities (IT appliance safe)
•250V / 500V insulation test voltages
•Substitute leakage tests
•Single rotary dial position initiates test sequence
•Class I IT 200mA Earth Bond
•Class II
•Extension lead test – including polarity
•LED indication of pass / fail as well as a result display
•Automatic check if appliance is switched on or not
•Test 110V appliances for earth bond and insulation
(with appropriate test adaptor).
•Tests in accordance with the IEE Code of Practice
•Powered by batteries
•Earth lead
•Instruction Manual
•Calibration Certificate
•Extension Lead Adaptor
•Pass & Fail labels
•PATLOG1 PAT record log book for multiple sites
•PATLOG2 for single sites, including pass labels
MEASUREMENT OF INSULATION RESISTANCE - R INS
Rating 250V / 20M Ωand 500V / 20M Ω
Measuring range 0.1~19.99M Ω
Resolution 10kΩ
Rated voltage 250V/500V DC(-0%/+30%) @250k Ω/500kΩ
Short-circuit current 2.5mA DC or less
Accuracy ± (2%rdg+3dgt)
Protective conductor Insulation Substitute Polarity
resistance resistance Leakage
current
LED Colour Green Amber Green Green Green
Extension Lead Rpe < 0.1 Ω Ppe < 0.1 Ω Rins > 1M Ω Cont < 10 Ω
< 0.3 Ω
Class I Rpe < 0.1 Ω Ppe < 0.1 Ω Rins > 1M Ω Leak < 0.75mA
< 0.3 Ω
Class II Rins > 2M Ω Leak < 0.25mA
THRESHOLD AND DISPLAY
Test function Leakage current test
Measuring range 0.1-12.00A rms
Resolution 0.01mA
Accuracy ±(3%rdg ± 5dgt)
SUSTITUTE LEAKAGE CURRENT
Test function IT 200mA continuity test
Measuring range 0 - 19.99 Ω
Resolution 10mΩ
Open-circuit voltage 5V
Measuring current 200mA DC (nominal)
Accuracy ±(3%rdg ± 5dgt)
MEASUREMENT OF PROTECTIVE CONDUCTOR RESISTANCE - RPE
ACCESSORIES
PRODUCT DATA SHEET
SPECIFICATIONS
OPTIONAL
KT72
PAT Tester with
Auto Test Sequence
1
Electricity is dangerous and can cause injury and death. Always treat it
with the greatest of respect and care. If you are not quite sure how to
proceed, then stop, take advice from a qualified person.
This instruction manual contains warning and safety rules which must be
observed by the user to ensure safe operation of the instrument and
maintain it in a safe condition. Therefore, read through these operating
instructions before using the instrument.
IMPORTANT:
This instrument must only be used by a competent and trained person
and operated in strict accordance with these instructions.
KEWTECH will not accept liability for any damage or injury caused
by misuse or non-compliance with the instructions or with the safety
procedures.
It is essential to read and to understand the safety rules contained in
these instructions and with the safety procedures.
The symbol #indicated on the instrument means that the user must refer
to the related sections in the manual for safe operation of the instrument.
Be sure to carefully read instructions following each symbol #in this
manual.
#DANGER is reserved for conditions and actions that are likely
to cause serious or fatal injury.
#WARNING is reserved for conditions and actions that could
cause serious or fatal injury.
#CAUTION is reserved for conditions and actions that could
cause minor injury or instrument damage.
Note: This indicates information that is essential for handling the
instruments or should be noted in order to familiarise yourself
with the instruments operating procedures and/or functions.
#DANGER
●Do not apply any voltage to the test socket and test lead of this
instrument.
●For safety reasons, only use the Test Leads designed to be
used with this instrument and recommended by KEWTECH.
●Do not touch the device under test whilst testing is in
progress.
1.Safe testing
2
#DANGER
●Sin ce a high v oltage of 250V or 500V is being out put
continuously, when measuring insulation resistance, the user
may get an electrical shock. Any capacitors in the appliance
under test may become charged during testing and may
contain hazardous voltages do not touch them.
●Do not touch the metal part of the Test Lead with crocodile clip
(M-7242) whilst testing is in progress.
●Do not touch or disconnect the appliance under test until
testing is completed.
#WARNING
●Never open the instrument case – because dangerous voltages
are present. Only fully trained and competent electrical
engineers should open the case.
●If abnormal conditions of any sort are noted (such as a faulty
display, unexpected readings, broken case, cracked test leads,
etc) do not use the instrument and return it to your distributor
for inspection and repair.
●Never attempt to use the instrument if the instrument or your
hands are wet.
#CAUTION
●When using Test Leads with the crocodile clip, be sure to
check the crocodile clip is firmly connected to the metal part of
the device under test. Otherwise, inaccurate measurements or
arcing at the contacts may occur.
●The recomended rated measuring voltage for the insulation
test is 500V DC.
If this voltage seems too high for the appliance under test
contact the appliance manufacturer for advice. The IEE Code of
Practice allows for a touch current test (substitute leakage) or
a 250V insulation test where a 500V insulation test cannot be
carried out.
●We are not liable for loss of data on PC during testing with this
instrument. The appliance under test is powered on during
most tests, but please turn it to the OFF position after testing.
●Use a very slightly damp cloth for cleaning the instrument. Do
not use abrasives or solvents.
●When the measurement function is completed, turn the
function switch back to the OFF position to turn off.
●This instrument will automatically be powered off after
approximately 10 minutes if no key operation is carried out.
●If the instrument will not be used for a prolonged period,
remove the batteries.
Safe testing
3
The KT72 has a dedicated cover to protect against an impact from the
outside and to prevent the fascia, the LCD, and the connector socket from
becoming dirty. The cover can be detached and put on the backside of
the main body during measurement.
2.1 Method of removing the cover
2.2 Method of storing the cover
Fig.1
Fig.2
2.Procedure
of removing
cover
4
3.1 Product summary
The KT72 is a hand-held battery powered portable appliance tester,
performing three functions to ensure the Safety of Class I and Class
II appliances. Readings are displayed on a large liquid crystal display
(LCD) below which are four bicolour LEDs, which unambiguously
display a pass or fail indication for results dictated by the IEE Code of
Practice.
This instrument is suitable for performing tests as required by the
following standard.
The IEE Code of Practice for In-service Inspection and Testing of
Electrical Equipment: 2007
This instrument is designed to check the electrical safety of appliances
of Class I and Class II categories.
As a guide the two categories are defined as follows:
Class I : Appliances which have functional insulation throughout and an
earth connected case. These are often described as earthed
appliances.
Class II: Appliances which have both functional and additional insulation
where any metal parts cannot becomeLiveunder fault
conditions, often referred to as double insulated.
3.Product
summary and
explanation
5
3.2 Test Functions
KT72 has the following features.
Function Tests of contents
Class I Test 200mA
●Protective conductor resistance (Test current
200mA DC nominal)
●Insulation (Test voltage 250V DC or 500V
DC)
●Substitute leakage current test
Class ll Test
●Insulation (Test voltage 250V DC or 500V
DC)
●Substitute leakage current test
Extension Lead test
●Protective conductor resistance (Test current
200mA DC nominal)
●Insulation L/N-PE (Test voltage 250V DC or
500V DC)
●L-N Short
●Polarity
3.3 Features
●Auto-testing
●Checks for whether the appliance is correctly switched ON or not
●Selection for 250V or 500V for the insulation resistance test.
●Null function for the earth bond test lead.
●Over range indication on the LCD.
●Pass / fail indication of tests by LEDS and by a buzzer.
●Auto-power-off function
Product
summary and
explanation
6
3.4 Instrument layout
Front View
End View
⑴Test socket
Insert the mains plug of the appliance to be tested in to this socket for
the protective conductor resistance, insulation resistance, substitute
leakage current test and extension lead test.
⑵LCD
Measured value is displayed
⑶LED for test result
When the value of protective conductor resistance, insulation
resistance and substitute leakage current exceeds the limit dictated by
applicable standards, LEDs light up in red. When it is within the limit,
the LEDs light up in green. (For protective conductor resistance, the
LED can light orange, for details please refer to the note in section 6.1:
Class I Test.)
⑷Start switch
A measurement starts by pressing this switch.
(1) Test socket (2) LCD
(3) LEDs for test result
(4) Start switch
(5) NULL /250V-500V
switch
(6) Function switch
(7) Terminal for Extension lead adaptor
(8) Terminal for RPE – Test lead
Fig.3
Product
summary and
explanation
7
⑸NULL/250V-500V switch
●The rotary dial has to be set to a Class l or Extension Lead test for
this button to be used to zero out the test lead resistance.
●The rotary dial has to be set to Class ll for this button to be used to
select either 250 V or 500V insulation test voltage
⑹Function switch
Select a function with this switch.
⑺Terminal for Extension lead adaptor
For use with the KAMP S (UK) extension lead adaptor.
⑻PE / Class II insulation probe
Connect the Test Lead with crocodile clip (M-7242) (fig 4) to this
terminal for the measurement of protective conductor resistance and
Class II insulation, and clip the metal parts of the appliance under test
with the crocodile clip.
⑼Test Lead with crocodile clip M-7242
⑽Extension leads adaptor KAMP S (UK)
This is for connecting the instrument and a mains extension lead.
⑾Earth pin adapter M-8251
Product
summary and
explanation
Fig.4
IEC Connector
Fig.5
Fig.6
8
3.5 Explanation for indications
LCD Display
Product
summary and
explanation
RPE Continuity indication
(with both polarities)
Appears when the batteries are
becoming low
Leakage current indication
Null indication
Unit indication
Over range display: “ >” is displayed on the LCD.
Insulation measurement voltage
Fig.7
9
List of display message
Displayed when the value at preliminary
measurement for the protective conductor
resistance exceeds 20Ω, a n d t h e
measurement cannot be carried out.
Displayed when the protective conductor
resistance exceeds the threshold value. (*1)
Displayed when appliance under test is
switched off.
Displayed when the insulation resistance
between LN-E is less than the threshold value.
Displayed when the leakage current exceeds
the threshold value.
Displayed when L-N is close to short during an
Extension lead test.
Displayed when the resistance between L-L
exceeds 10Ωduring an Extension lead test.
Displayed when the resistance between N-N
exceeds 10Ωduring an Extension lead test.
(*1): Extension leads and appliances with long mains leads have a
greater resistance allowance for earth continuity. Please refer to the
table.1 on page 11.
3.6 Applicable standards
Instrument operation
The IEE Code of Practice for In-service Inspection and Testing of
Electrical Equipment: 2007
Safety
IEC/EN61010-1 CAT.III 300V-instrument
IEC/EN61010-031 CAT.III 300V-test lead
EMC
EN61326 (EN55022/EN61000-4-2, 4-3)
Product
summary and
explanation
Table of contents
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