Oct. 2015 Edition 1
Printed in Japan
CT7631A961-00 15-10H
EN
Instruction Manual
CT7631
CT7636
CT7642
AC/DC
CURRENT SENSOR
13-09
Introduction
Thank you for purchasing the Hioki CT7631, CT7636, CT7642
AC/DC Current Sensor. To obtain maximum performance
from the device, please read this manual first, and keep it
handy for future reference.
Be sure to also read the separate booklet “Current Sensor
Operating Precautions” before use.
Troubleshooting
If the device seems to be malfunctioning, contact your
authorized Hioki distributor or reseller.
Overview
This current sensor has a Hioki PL14 output connector,
enabling it to be automatically recognized when connected to
a compatible instrument for simple setup.
Parts Names
Example: CT7636
Jaw
Cable
Protective barrier
Lever
Output connector
Measurement Methods
Inspection Before Use
Verify that the device operates normally to ensure that no
damage occurred during storage or shipping. If you find any
damage, contact your authorized Hioki distributor or reseller.
Check Items
Remedy
Is the jaw cracked or
damaged?
If there is any damage, electric
shock may result. Discontinue use
and contact your authorized Hioki
distributor or reseller.
Is the cable insulation torn?
Is the cable broken at the
base (of the connector or
grip)?
Broken connections will make
proper measurement impossible.
Discontinue use and contact your
authorized Hioki distributor or reseller.
•
Attach the clamp around only one conductor. If you
clamp single-phase (2-wire) or three-phase (3-wire)
conductors together, the device will not be able to make a
measurement.
「シールド線は挟まない」の説明を
記載する/しないは製品ごと技術に確認する
↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓
OK
NO
NO
NO
OK
NO
NO
NO
•
When a conductor to be measured is clamped in the center
of the jaw, measurement is performed the most accurately,
with no effect of the conductor position.
•
To measure low current levels, multiple windings may be
used to increase relative sensitivity (10 windings multiplies
the measured current by a factor of 10). However, in this
case, the windings should be made radially, with a diameter
of at least 20 cm.
•
The reading may show a measurement greater than the
actual value due to magnetic-field interference. The amount
of interference varies depending on the sensor. For details,
see “Magnetic-field interference” in Specifications.
•
For more information about instrument operation and
settings, see the instrument’s instruction manual.
1
Connect the device to the instrument.
Instrument
Align and insert the connector.
Align the arrow on the device’s output connector with
the
on the compatible instrument’s sensor input
connector and insert the connector.
2
Perform zero-adjustment. (DC measurement
)
Perform zero-adjustment under no-input conditions.
3
Clamp the conductor
Source
Load
Conductor
Current direction indicator
Current direction
Gripping the lever to open the jaw, align the current
direction indicator with the direction of the current in the
conductor, and close the jaw with the conductor roughly
centered in the jaw.
If the phase is not an issue during AC measurement,
the direction of current flow in the wire relative to the
current direction indicator may be ignored.
Close the tips of the jaw completely before performing
measurement. If the output cable is caught on the jaw or
the jaw is forced into the measurement location, it may
not close completely. If this occurs, it will not be possible
to obtain an accurate measurement.
4
Once measurement is complete, remove the
device from the conductor and disconnect it
from the instrument.
When disconnecting the device from the instrument,
grip the tip of the output connector (the part with the
arrow) and pull the connector straight out.
Pulling forcibly on the base of the connector may
damage the device.
Specifications
General Specifications
CT7631
CT7636
CT7642
Operating
environment
Indoors, pollution degree 2,
altitude up to 2000 m (6562 ft.)
Operating
temperature
and humidity
−25°C to 65°C (−13.0°F to 149.0°F), 80% RH or less
(no condensation)
Storage
temperature
and humidity
−25°C to 65°C (−13.0°F to 149.0°F), 80% RH or less
(no condensation)
Dustproof and
waterproof
(EN60529)
Jaw, barrier, grip:
IP40
Jaw, barrier: IP50
Grip: IP54 (when measuring an
insulated conductor only)
Risk of electric shock from the
conductor being measured increases
when wet.
Standards
Safety: EN61010
EMC: EN61326
Dielectric
strength
7.4 kV AC for 1 minute (between jaw and grip, between
jaw and output connector)
Power
consumption
category
Sensor power consumption category: 1
(See the continuous operating time for the instrument to
which the device is to be connected.)
Dimensions
(Not including dimensions of protruding parts, lever, or
jaw)
Approx. 58W ×
132H × 18D mm
(2.28″W × 5.20″H
× 0.71″D)
Approx. 64W ×
160H × 34D mm
(2.52″W × 6.30″H
× 1.34″D)
Approx. 64W ×
195H × 34D mm
(2.52″W × 7.68″H
× 1.34″D)
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