Gossen MetraWatt WZ12A User manual

WZ12A ... F, Clip 0100S
3-349-016-02
9/10.18
Operating Instructions
-E

2GMC-I Messtechnik GmbH
1 Safety Features and Symbols
The WZ12 current transformer is manufactured and tested
in accordance with IEC 61010-1 and IEC 61010-2-032
safety regulations. When used for its intended purpose
safety of the operator, as well as that of the instrument, is
assured. Their safety is however not guaranteed, if the
instrument is used improperly or handled carelessly.
In order to maintain flawless technical safety conditions,
and to assure safe use, it is imperative that you read the
operating instructions thoroughly and carefully before plac-
ing your instrument into service, and that you follow all
instructions contained therein.
Observe the following safety precautions:
• The instrument may be used in measuring category II
electrical circuits of up to max. 600 V (phase to neutral
conductor) or in measuring category II I electrical
circuits of up to max. 300 V (phase to neutral conduc-
tor), to 400 V (phase to phase in 4-wire 3-phase
systems) or to 500 V (phase to phase in 3-wire
3-phase systems).
• An open secondary circuit at the WZ12A or WZ12D may
lead to dangerous secondary voltages and to the
destruction of the secondary coil. Make absolutely cer-
tain that the secondary circuit is always connected to the
measuring circuit at the measuring or recording instru-
ment first.
• The secondary circuit may not, at any time, be inter-
rupted due to poor contact at the cables, defective
fuses or interrupted circuits within the measuring
instrument! The current transformer may not be con-
nected to primary current until this condition has been
fulfilled!
(Note: This safety precaution does not apply to models
equipped with voltage outputs (mV/A or mV/mA),
which are supplied with internal matching resistors.)
• Never measure current which exceeds the specified
maximum value.
• The surfaces between the jaws must always be free of
dust or other contamination!
• The clip may only be held at the gripping surfaces
behind the protective collar which have been provided
for this purpose during operation.

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• The clip-on transformer must be removed from service immedi-
ately if the cables or housing components are damaged.
• Check the secondary circuits of the WZ12A clip-on
transformer on a regular basis to make sure that continu-
ity is uninterrupted. Remove the clip-on transformer from
service if poor contacts become apparent.
• The clip-on current transformer must be protected
against liquids and contamination.
Meaning of Symbols on the Instrument
Warning concerning a point of danger
(Attention: observe documentation!)
Continuous, doubled or reinforced insulation
Indicates EU conformity
This device may not be disposed of with the trash.
Further information regarding the WEEE mark can
be accessed on the Internet by entering the search
term ’WEEE’ at www.gossenmetrawatt.com .
2 General Description
The WZ12 current transformer allows for the interruption-
free measurement of alternating current within various
measuring ranges from 1 mA to 180 A by enclosing the
electrical conductor.
The WZ12A basic model has been designed for general
current measurements in electrical circuits of greater than
15 A. Its low price and compact dimensions make it an
attractive alternative.
Models WZ12B ... F function with practically no eddy-cur-
rent loss at all thanks to high performance core materials.
They demonstrate a minimal loss angle and can thus be
used for power measurement.
Enhanced sensitivity allows for the measurement of leak-
age currents at machinery and within electrical installations
with the WZ12C and the Clip 100S.
The converted output signal is transmitted via 2-conductor
connection with 4 mm angle plugs (Clip 0100S with jack
plugs). The housing and cables are isolated from the live
conductor with double insulation.
!

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3 Performing Measurements
The probe should be calibrated on a regular basis in order
to assure flawless functioning and measurement accuracy.
Due to the fact that the nickel iron core used for types
BF and Clip 0100S is highly sensitive to impact, special
attention must be paid during measurement, storage and
transport: Powerful impacts and vibration must be
avoided.
Make sure that the secondary circuit is connected to the
measuring circuit at the measuring or recording instrument
first. Observe the safety precautions listed in chapter 1, as
well as the specified allowable output load range for the
respective clip-on transformer. Observe correct phase
sequencing for k and l at the measuring instrument for
power measurements.
Type A and D probes are equipped with a current output
and are connected to the current measurement inputs (e.g.
300 mA). Before closing the probe around the current con-
ducting cable, check the secondary circuit, as well as the
measurement input at the measuring instrument with an
ohmmeter if necessary: Neither circuit may be interrupted!
Do not enclose the primary conductor with the clip until
after this test has been performed. The measurement value
is calculated by multiplying the displayed value by the
transformation ratio, or the appropriate transformation ratio
can be selected at the measuring instrument (e.g.
METRAHIT BASE, METRAHIT TECH or METRAHITT-COM).
Be sure to remove the clip from the primary conductor
before the connections at the measuring instrument are
disengaged.
Probe types B, C, E, F and Clip 0100S convert primary
current into a proportional output voltage, and must there-
fore be connected to the voltage measurement input (mV
or V) at the measuring instrument.

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4 Technical Data
Type WZ12A WZ12B WZ12C WZ12D WZ12E WZ12F Clip 0100S
Article Number Z219A Z219B Z219C Z219D Z823D Z823E Z501E
Measuring Range 15180 A~ 10mA100A~ 1mA15 A~ 30mA150A~ 0.2150 A~ 20mA15A~ 1mA15 A~
1A150 A~ 1 A150 A~
Frequency Range 4565
400 Hz
4565
500 Hz
4565
400 Hz
4565
500 Hz
304565
500 Hz
304565
500 Hz
4565
500 Hz
Transformation Ratio 1000 : 1
(100 mA/A) 100 mV/A 1mV/mA 1000 : 1 (100 mA/A) 10 mV/A 100 mV/A 1 mV/mA
1mV/A 1mV/A
Output Burden/Load < 5 >1M>1M<50>10k1113 k>1M
> 10 k>10k
Intrinsic Uncertainty
under Reference
Conditions
3% rdg. 1.5% rdg.
1mA
3% rdg.
0.2 mA 2.5% rdg.
1mA
2% rdg.
10 mA
2% rdg.
1mA
3% rdg.
0.2 mA
2% rdg.
0.1 A
2% rdg.
0.1 A

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Legend
rdg. = of reading
1) Do not operate the clip-on transformer continuously without load.
Influence Error
Frequency fminfmax
3% rdg. 1.5% rdg.
1mA
3% rdg.
0.2 mA 2.5% rdg.
1mA
2% rdg.
10 mA
2% rdg.
1mA
3% rdg.
0.2 mA
2% rdg.
0.1 A
2% rdg.
0.1 A
Influence Error
Temperature
/10 K (typ.)
3% rdg. 1.5% rdg. 3% rdg. 2.5% rdg. 2% rdg. 2% rdg. 3% rdg.
Typical
Phase An-
gle Error
4565 Hz
fminfmax not defined 3
10
not defined 3
102 102 15
not defined
3
103 10
Max.
Overload
cont.
dyn.< 1s
360 A
900 A
200 A
500 A
300 A
750 A
300 A
750 A
300 A
750 A
30 A
75 A
300 A
750 A
Open-Circuit Voltage max. 15 V 1) max. 15 V max. 27 V max. 27 V 1) max. 27 V max. 27 V max. 27 V
Type WZ12A WZ12B WZ12C WZ12D WZ12E WZ12F Clip 0100S

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Reference Conditions
Frequency 45 65 Hz
Waveshape Sine
Temperature 21 25 C
Relative Humidity 45 55%
Output Burden/Load Specified range
Electrical Safety
Protection Class II per IEC 61010-1/
VDE 0411-1
Measuring Category II III
Operating Voltage 600 V 300 V
Pollution degree 2
Test Voltag e 3.7 kV AC, 1 min.
Ambient Conditions
Operating Temperature –10 C +40 C
Storage Temperature –20 C +70 C
Electromagnetic Compatibility
Emission EN 61326-1
Immunity EN 61326-1
Mechanical Design
Dimensions 40 mm x 26 mm x 120 mm
Jaw Opening 15 mm 
Housing Material Plastic (Novodur),
Color: anthracite
Connector Cable Length: approx. 120 cm
Protection: IP40
WZ12AF:
with contact-protected
4 mm banana plugs
Clip 0100S:
with 3, 5 mm jack plug
Weight approx. 170 g

Edited in Germany • Subject to change without notice • A pdf version is available on the internet
GMC-I Messtechnik GmbH
Südwestpark 15
90449 Nürnberg • Germany
Phone [phone]
Fax [phone]
E-Mail [e-mail]
www.gossenmetrawatt.com
5 Maintenance
The clip-on current transformer requires no maintenance.
The probe may not be immersed into any liquids during
cleaning, and no solvents may be used. The surfaces
between the jaws should be cleaned with a lightly oiled
cloth on a regular basis. Remove contamination and dust
from the plastic components and connector cables with a
cloth which has been dampened with soapy water. Mea-
sure the resistance at the secondary circuit with an ohm-
meter on a regular basis. If loose contacts become appar-
ent, remove the clip-on current transformer from service.
6 Repair and Replacement Parts Service
Calibration Center and Rental Instrument Service
If required please contact:
GMC-I Service GmbH
Service-Center
Beuthener Straße 41
90471 Nürnberg • Germany
Phone [phone]
Fax [phone]
E-mail [email protected]om
This address is only valid in Germany.
Please contact our representatives or subsidiaries
for service in other countries.