HT HTFLEX33D User manual

Copyright HT ITALIA 2013 Release EN 2.00 - 24/06/2013
ENGLISH
User manual

HTFLEX33D
EN – 1
Table of Contents:
1.PRELIMINARY AND SAFETY..................................................................................... 2
1.1.During use.........................................................................................................................3
2.INSTRUMENT DESCRIPTION.................................................................................... 3
2.1.Introduction........................................................................................................................3
2.2.Transducer’s functions ......................................................................................................4
3.INSTALLATION ........................................................................................................... 5
4.MAINTENANCE .......................................................................................................... 5
5.END OF LIFE .............................................................................................................. 5
6.TECHNICAL SPECIFICATIONS ................................................................................. 6
6.1.Reference standards ......................................................................................................... 6
6.2.Technical features.............................................................................................................6
6.3.Mechanical features ..........................................................................................................6
6.4.Environment conditions ..................................................................................................... 6
7.SERVICE..................................................................................................................... 7
7.1.Warranty conditions........................................................................................................... 7
7.2.Service ..............................................................................................................................7

HTFLEX33D
EN – 2
1. PRELIMINARY AND SAFETY
CAUTION
For your own safety as well as that of the apparatus you are recommended to
follow the procedures described in this instruction manual and carefully read all
the notes preceded by the symbol . No compliance with the CAUTIONs
and/or Instructions may damage the apparatus, its components, or injure the
operator.
Read this instruction manual and the instrument’s one before starting use.
Any instruction preceded by the caution symbol must be observed in order to avoid
accidents or damages.
This product must be used only by qualified personnel practicing applicable safety
precautions, wear protective clothing and gloves as required.
Do not effect any measurement under conditions beyond the limits specified in this
manual.
Always connect unit to display device before installing the flexible measuring heads.
Do not install the clamp around cables where the current flowing is greater than the
maximum measurable current (Overrange).
CAUTION
Hazardous potentials may exist in the vicinity of the desired current
measurements. Use locally approved safety procedures when working near
hazardous potentials
It is recommended not to install the clamp around a live bus that is at a
hazardous potential. If installation is not possible when the bus is inactive or
power is turned off, always use appropriate gloves and/or equipment approved
for working around hazardous potentials when installing the HTFLEX33D in the
vicinity of these potentials.
The HTFLEX33D transducers and interconnection cables use double insulation to protect
the operator from possible hazardous potentials of the bus. The current probes are rated
for Installation Category III, Pollution Degree 2. The maximum voltage to earth rating for
the transducer and cable is 1000VAC.
The following symbols are used:
Caution: Refer to the instruction manual. Incorrect use may damage the
apparatus or its components.
Do not apply around or remove from HAZARDOUS LIVE conductors.
Double insulated meter.

HTFLEX33D
EN – 3
1.1. During use
Carefully read the following recommendations and instructions:
Always de-energize circuit under test before installing flexible measuring heads.
Always inspect the connecting cable and the flexible measuring heads for damage
before using this product.
Do not use the clamp on non-insulated conductors whose potential to earth exceeds
1000V AC
Do not use the clamp outdoor
Do not expose the clamp to water splashes.
Keep the clamp gap perfectly clean
Should the clamp be unintentionally used without load (not connected to the measuring
instrument), take the clamp off the cable, wait 1 minute before connecting the clamp to
the measuring instrument, then clamp the cable again
Do not use the HTFLEX33D if is or seems damaged
2. INSTRUMENT DESCRIPTION
2.1. Introduction
HTFLEX33D is an innovative current transducer based on the Rogowsky’s principle that
combines easy use with measurement accuracy.
The HTFLEX33D current probe is similar in purpose to a CT or current transformer. The
output is an analogue voltage proportional to the AC current in the conductor. The output
signal is isolated form the hazardous conductor potentials and is exact replica of the
current waveform in the conductor. The output signal is available via a 3 pin connector
(see Fig. 1).
Shield
Fig. 1: Internal connectors scheme

HTFLEX33D
EN – 4
2.2. Transducer’s functions
The current probe HTFLEX33D, lightweight and flexibility, is a versatile current probe that
may be wrapped around most conductors. The transducer has a preset bend that allows the
transducer to be more easily maneuvered around the conductors (see Fig. 2). It's application
versatility and isolation rating clearly distinguishes the HTFLEX33D transducers from other
current measuring methods. The measuring transducers are constructed from non-ferrous
materials, minimizing any circuit loading due to magnetic influence.
Fig. 2: Measurement transducer
The frequency response of the current probes is rather wide compared to conventional
CTs. This allows the user to monitor a much wider range of line harmonic components
than conventional CTs allow.
The HTFLEX33D transducer was designed to be very flexible, larger in aperture and
smaller in cross section than many conventional CTs. This allows measurements in tight
places as never before possible.

HTFLEX33D
EN – 5
3. INSTALLATION
The current probe was designed to allow the operator to connect this measurement
device around a conductors without disconnecting it as many CTs presently require.
Even though the current probes output is AC, there are instances where the user will
want to orient the transducer so that proper polarity will exist at the output terminals.
This is done by installing the transducers around the conductors with the molded-in
arrow on the latch (see Fig. 2) pointing in the direction of conventional current flow.
Conventional current flow is defined as current flowing from the positive to the negative
potential
When a three phase plant is under test, the correspondence between volt probe of
measuring instrument connected and clamp measuring the same phase must be
respected. Please refer to phase labels (I1, I2, I3) present on flexible clamps and
interconnection cables
The current probes must be installed with the interconnection cable on the outside of
the loop when the latch is engaged. The polarity arrow, the double insulation, and the
CAUTION symbols will all be on the outside of the loop. It should also be noted that the
current probes would produce twice the output voltage if you wrap the transducers
around the conductors twice
There is minimal shock hazard using a HTFLEX33D current probes. Each transducer
has been Hi-Pot tested to several thousand volts with no voltage breakdown. This
particular characteristic allows high-current measurement (with a wide frequency
bandwidth) of conductors at less than 1000VAC potential to earth.
CAUTION
Hazardous potentials may exist in the vicinity of the desired current
measurements. Use locally approved safety procedures when working near
hazardous potentials
It is recommended not to install the clamp around a live bus that is at a
hazardous potential. If installation is not possible when the bus is inactive or
power is turned off, always use appropriate gloves and/or equipment approved
for working around hazardous potentials when installing the HTFLEX33D in the
vicinity of these potentials.
4. MAINTENANCE
CAUTION
Remove the detergent with clean water, then wipe dry with a clean cloth. The
use of solvents as cleaners are not recommended unless thoroughly tested
and found harmless to all surface and parts. Do not submerge the
HTFLEX33D transducers or the electronics package into water or other fluids
Preventive maintenance primarily consists of cleaning the transducers and
cable to prevent surface contamination. Use a mild detergent and water to
clean the transducers and cables. Remove the detergent with clean water,
then wipe dry with a clean cloth
5. END OF LIFE
CAUTION: the symbol on the instrument indicates that the appliance and its
accessories must be collected separately and correctly disposed of

HTFLEX33D
EN – 6
6. TECHNICAL SPECIFICATIONS
6.1. Reference standards
Safety: IEC/EN61010-1; IEC/EN61010-2-031
IEC/EN61010-2-032
Insulation: double insulation
Pollution degree: 2
Max height of use: 2000m (6562ft)
Measurement category: CAT III 1000VACrms Phase - Earth
6.2. Technical features
Current ranges: Max 3000A ACrms
Output signal (@1000 Arms,50Hz): 85mVAC
Accuracy (@ +25C, 50Hz): ±0.5%rdg
Linearity: ±0.2%rdg (from 10% to 100% of range)
Internal resistance of probe: 157± 15
Load impedance: 399.2k
Frequency Range (-3dB): 10Hz 20kHz
Phase Error (45 - 65 Hz): ±1°
Position Sensitivity: 2%rdg
Temperature Coefficient: ± 0.05%rdg per °C
Working voltage: 1000V DC/ACrms
6.3. Mechanical features
Output connection: 2 m cable with 3 way Hypertac connector
Length of flexible clamp: 610mm (24in)
Maximum conductor diameter: 174mm (7in)
Weight: 215g (8 ounces)
Material: TPE, Polypropylene, UL94-VO rated
Mechanical protection: IP65
6.4. Environment conditions
Working temperature: –20°C 80°C (–4°F 176°F)
Storage temperature: –40°C 90°C (–40°F 194°F)
Working and storage humidity: 15% 85%RH without condense
This instrument complies with the prescriptions of the European directive on low
voltage 2006/95/EEC (LVD) and EMC directive 2004/108/EEC

HTFLEX33D
EN – 7
7. SERVICE
7.1. Warranty conditions
This instrument is guaranteed against any defect in material and manufacturing in
compliance with the general sales terms and conditions. Throughout the period of
guarantee all defective parts may be replaced and the manufacturer reserves the right to
repair or replace the product.
If the instrument is to be returned to the after-sales service or to a dealer transportation
costs are on the customer’s behalf. Shipment shall be however agreed upon.
A report must always be enclosed to a rejected product stating the reasons of its return. To
ship the instrument use only the original packaging material; any damage that may be due
to no-original packing shall be charged to the customer.
The manufacturer declines any responsibility for damages caused to persons and/or
objects.
Warranty is not applied in the following cases:
Any repair that might be necessary as a consequence of a misuse of the instrument or
of its use with no compatible devices.
Any repair that might be necessary as a consequence of improper packaging.
Any repair that might be necessary as a consequence of service actions carried out by
unauthorized personnel.
Any modification of the instrument carried out without the authorization of the
manufacturer.
Use not provided for in the instrument’s specifications or in the instruction manual
The content of this manual cannot be reproduced in any form whatsoever without prior
authorization of the manufacturer.
All our products are patented and their trade marks registered. The manufacturer
reserves the right to modify the product specifications and prices if this is aimed at
technological improvements
7.2. Service
If the instrument does not operate properly, before contacting the after-sales service check
cables as well as test leads and replace them if necessary. Should the instrument still
operate improperly check that the operation procedure is correct and conforms to the
instructions given in this manual. If the instrument is to be returned to the after-sales
service or to a dealer transportation costs are on the customer’s behalf. Shipment shall be
however agreed upon. A report must always be enclosed to a rejected product stating the
reasons of its return. To ship the instrument use only the original packaging material; any
damage that may be due to no-original packing shall be charged to the customer.