
9291
CLAMP ON SENSOR
Instruction Manual
September 2015 Revised edition 13 Printed in Japan
9291A980-13 15-09H
Introduction
Overview
Inspection
Preliminary Checks
Safety
DANGER
This product is designed to comply with IEC 61010 Safety
Standards, and has been thoroughly tested for safety prior to
shipment. However, mishandling during use could result in injury
or death, as well as damage to the product. However, using the
product in a way not described in this manual may negate the
provided safety features.
Be certain that you understand the instructions and precautions in
the manual before use. We disclaim any responsibility for
accidents or injuries not resulting directly from product defects.
Indicates cautions and hazards. When the symbol is
printed on the produc, refer to a corresponding topic
in the Instruction Manual.
Indicates AC (Alternating Current).
Indicates a double-insulated device.
Indicates that the instrument may be connected to or
disconnected from a live circuit.
DANGER Indicates that incorrect operation presents an
extreme hazard that could result in serious injury or
death to the user.
WARNING Indicates that incorrect operation presents a
significant hazard that could result in serious injury
or death to the user.
CAUTION Indicates that incorrect operation presents a
possibility of injury to the user or damage to the
product.
NOTE Advisory items related to performance or correct
operation of the product.
Notes on Use
DANGER
To avoid short circuits and potentially life-threatening
hazards, never attach the clamp to a circuit that operates at
more than the 600Vrms.
Clamp sensor should only be connected to the secondary
side of a breaker, so the breaker can prevent an accident if
a short circuit occurs. Connections should never be made
to the primary side of a breaker, because unrestricted
current flow could cause a serious accident if a short
circuit occurs.
WARNING
To avoid electric shock, do not allow the product to get
wet, and do not use it when your hands are wet.
To avoid electric shock when measuring live lines, wear
appropriate protective gear, such as insulated rubber
gloves, boots and a safety helmet.
Note that the product may be damaged if current exceeding
the selected measurement range is applied for a long time.
CAUTION
Keep the clamp jaws and jaw slits free from foreign objects,
which could interfere with clamping action.
Do not store or use the product where it could be exposed to
direct sunlight, high temperature or humidity, or condensation.
Under such conditions, the product may be damaged and
insulation may deteriorate so that it no longer meets
specifications.
To avoid damage to the product, protect it from vibration or
shock during transport and handling, and be especially careful
to avoid dropping.
NOTE
Accurate measurement may be impossible in the presence of
strong magnetic fields, such as near transformers and high-
current conductors, or in the presence of strong electromagnetic
fields such as near radio transmitters.
Measurement Procedure
CAUTION
When disconnecting the BNC connector, be sure to release the
lock before pulling off the connector. Forcibly pulling the
connector without releasing the lock, or pulling on the cable,
can damage the connector.
To prevent damage to the product and sensor, never connect or
disconnect a sensor while the power is on.
Current direction arrow
in the direction of the
load
SOURCE
Line
LOAD
Specifications
Rated primary current 500 A AC
Rated secondary current 500 mA AC
Secondary current
amplitude accuracy 0.5%rdg. 0.2%f.s.
(f.s. : ranges of the 3166 and 3168)
(45 to 66Hz, at the jaw center)
Secondary current phase
accuracy Within 0.5 (45 Hz to 5kHz)
Amplitude frequency
charactristics Within 1% at 40 Hz to 5 kHz
(Deviation from accuracy)
Effect of external magnetic
field Approx. 0.1 A
(in an AC magnetic field of 400 A/m)
Effect of conductor position Within 0.5%
Maximum input current 550 A continuous at 45 to 66 Hz (50 ,122 )
See "Figure 1" for derating for the frequency.
Dielictric strength 7060 V rms AC 50 Hz/60 Hz, 1 minute,
(jaw - hand-held portion, jaw - output
connector)
Maximum rated voltage to earth Max. 600 Vrms
Operating temperature and
humidity range 0to50 (32 to 122 ), Max. 80%RH
(no condensation)
Storage temperature and
humidity range -10 to 60 (14 to 140 ), Max. 80%RH
(no condensation)
Location for use Altitude up to 2000 m (6562 feet), Indoors
Standards applying SafetyEN61010
Measurement Category III Pollution Degree 2
(anticipated transient overvoltage 6000 V)
EMC EN61326
Diameter of measurable conductor 46 mm dia. (1.81")
Cord length Approx. 3 m (9.8 feet)
External dimensions Approx. 78W 152H 42D mm (3.0"W 5.9"H
1.7"D) (excluding protrusions)
Mass Approx. 360 g (12.7 oz.)
Accessories Instruction manual, Mark band 6 (3 sets)
Figure 1 Frequency (Hz)
Input current (Arms)
At 50
Part Names
BNC connector
Jaws
Cable
Ferrite core
Maintenance and Service
Warranty
Warranty malfunctions occurring under conditions of normal use in
conformity with the Instruction Manual and Product Precautionary
Markings will be repaired free of charge. This warranty is valid for a
period of one (1) year from the date of purchase. Please contact the
distributor from which you purchased the product for further
information on warranty provisions.
Thank you for purchasing the HIOKI "9291 CLAMP ON SENSOR". To
obtain maximum performance from the product, please read this
manual first, and keep it handy for future reference.
The 9291 is current output type clamp on sensor, which is applicable
to 500A AC current measurements. The instrument can be used to
measure alternating current on a live power line without the need to
cut the wire. Easy operation and connection make them useful for
measuring alternating current and power in various fields.
(for use with HIOKI 3166 and 3168 CLAMP ON POWER HiTESTER)
When you receive the product, inspect it carefully If damage is
evident, or if it fails to operate according to the specifications, contact
your dealer or Hioki representative.
Before using the product the first time, verify that it operates
normally to ensure that the no damage occurred during storage or
shipping. If you find any damage, contact your dealer or Hioki
representative.
Before using the product, make sure that the insulation on the cable
is undamaged and that no bare conductors are improperly exposed.
Using the product in such conditions could cause an electric shock,
so contact your dealer or Hioki representative for repair.
Safety symbols
This manual contains information and warnings essential for safe
operation of the product and for maintaining it in safe operating
condition. Before using the product, be sure to carefully read the
following safety notes.
The following symbols in this manual indicate the relative importance
of cautions and warnings.
Measurement categories
This product complies with CAT III safety requirements.
To ensure safe operation of measurement dproducts, IEC 61010
establishes safety standards for various electrical environments,
categorized as CAT II to CAT IV, and called measurement
categories. These are defined as follows.
CAT II: Primary electrical circuits in equipment connected to an AC
electrical outlet by a power cord (portable tools, household
appliances, etc.)
CAT II covers directly measuring electrical outlet receptacles.
CAT III: Primary electrical circuits of heavy equipment (fixed
installations) connected directly to the distribution panel, and
feeders from the distribution panel to outlets.
CAT IV:The circuit from the service drop to the service entrance, and
to the power meter and primary overcurrent protection device
(distribution panel).
Using a measurement product in an environment designated with a
higher-numbered category than that for which the product is rated
could result in a severe accident, and must be carefully avoided.
Use of a measurement instrument that is not CAT-rated in CAT II to
CAT IV measurement applications could result in a severe accident,
and must be carefully avoided.
Follow these precautions to ensure safe operation and to obtain the
full benefits of the various functions.
In order to make the phases of the measurement and output currents
the same, clamp the jaws of the sensor onto the conductor so that
the current direction on the clamp points in the direction of the load,
and so that the conductor is approximately centered between the
jaws. Make sure that the tips of jaws are fully closed.
1. Align the BNC connector with the connector guide notch on the
current input connector. While pushing the connector in, turn it to
the right to lock it.
2. Open the jaws, and clamp the sensor onto the conductor.
Make sure that only one conductor is in the jaw.
3. Make sure that the tips of jaws are fully closed.
Accuracy is guaranteed for one year at 23 5(73 9)andMax.
80%RH, and in combination with the 3166 and 3168 CLAMP ON POWER
HiTESTER. (Opening and Closing of the jaw: Maximum 10000 times)
Cleaning the unit
To clean the product, wipe it gently with a soft cloth moistened with water or
mild detergent. Never use solvents such as benzene, alcohol, acetone, ether,
ketones, thinners or gasoline, as they can deform and discolor the case.
Service
If the product seems to be malfunctioning, contact your dealer or Hioki
representative.
Pack the product carefully so that it will not be damaged during shipment, and
include a detailed written description of the problem. Hioki cannot be
responsible for damage that occurs during shipment.