METREL A 1445 User manual

Flex current clamps
A 1445
User Manual
Version 1.1.0; Code No. 20 752 635

2
Distributor:
Producer:
METREL d.d.
Ljubljanska 77
SI-1354 Horjul
Tel.: [phone]
Fax: [phone]
E-mail: metre[email protected]i
http://www.metrel.si
Mark on your equipment certifies that this equipment meets the requirements
of the EC (European Community) regulations concerning safety and
electromagnetic compatibility.
© 2016 Metrel
No part of this publication may be reproduced or utilized in any form or by any means
without permission in writing from METREL.

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Table of contents
1Introducing the A1445 ..............................................................................................4
2Features ...................................................................................................................5
3Safety .......................................................................................................................6
4Symbols....................................................................................................................7
5Measuring current with A 1445.................................................................................8
6Cleaning ...................................................................................................................9
7Service....................................................................................................................10
8Technical specifications..........................................................................................11

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1 Introducing the A1445
The A 1445 Flexible Current Clamps consist of the flexible sensor and an
electronic module on the connected wire. It has three current ranges 30A, 300A and
3000 A. The current range of the A 1445 is selected directly by the connected
instrument. The electronic module is powered from the connected instrument to. The
flexible sensor permits measurements on conductors where standard clamp-on current
transformers can not be used. It is particularly useful for installation in tight spaces, or
around breaker panels, cable bundles, wide or large bus bars and irregular shapes.
Unlike standard current transformers, this flexible CP does not use magnetic cores.
The transformation principle is based on an air core. It presents virtually no load to the
system under test, has a low phase shift and excellent frequency response.
Additionally, A 1445 cannot be damaged by overloads. The A 1445 Flexible
Current Clamps are insensitive to DC current and measure only the AC component of
the measured signal.

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2 Features
Range setup from the instrument, no additional range setup needed
Power supply for electronic module is assured from the instrument
mV output
Waterproof sensor
Minimum angle shift to accomplish accurate power measurements
High accuracy
Total rejection of d.c. component
Friendly-use of the closing-opening system of the current sensor (even if wearing
gloves) due to its highly ergonomic design
It is possible to set the seal on the closing system of the current clamp.
Very light, flexible and fully adaptable to busbar trunking system and insulated
cables
Strengthened security, regardless the working environment industrial or services

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3 Safety
Read the operating instructions before use and follow all safety instructions.
If the test equipment is used in a manner that is not specified in this user
manual, the protection provided by the equipment might be impaired!
Adhere to local and national safety codes. Individual protective equipment must
be used to prevent shock and arc blast injury where hazardous live conductors
are exposed.
Before each use, inspect the Current Clamps and its latching system for any
damage. Pay particular attention to the insulation surrounding the flexible
measuring head. Look for cracks or missing portions of the clamp housing or
output cable insulation. Also look for loose or weakened components.
Do not use a clamp that is cracked, damaged, or has a defective cable.
Never use the clamp on a circuit with voltages higher than 1000 V CAT III or
600V CAT IV.
De-energize the installation on which current will be measured or adopt safe
operating procedures during application and removal of the current clamp.
Use extreme caution when working around bare conductors or bus bars.
Do not use the Current Clamp to measure bare conductors carrying a voltage
from 30V up to 1000V unless you are wearing protective clothing suitable for
high-voltage work. Contact with the conductor could result in electric shock.
Always use appropriate equipment for personal protection.
Use caution when working with voltages above 60 V dc, 30 V ac rms or 42 V ac
peak. Such voltages pose a shock hazard.

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4 Symbols
Symbol
Description
Important information. Refer to the manual.
Risk of Electric Shock.
Product is protected by Double/Reinforced insulation
Do not apply around or remove from HAZARDUS LIVE conductors.
Do not dispose of this product as unsorted municipal waste. Contact
Metrel or a qualified recycler for disposal.
Complies with the relevant European standards.

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5 Measuring current with A 1445
I
1
2
Picture 5.1: Wrap the measured cable with the measuring clamp
To use the A 1445 Flexible Current Clamps, follow these instructions:
1. Connect the D01 3 Pin connector of the A1445 Flexible Current Clamps to the
desired input on the measuring instrument (power meter,..) .
2. Select the corresponding sensitivity (.. mV/A) on your instrument.
3. Wrap the flexible measuring head around the conductor to be tested, close coupling
(See Picture 5.1 ).
4. It is very important that the conductor is as the center and perpendicular to the
measuring head. (if it is no possible additional error of 2% of full scale can occur).
5. Do not measure close to other current-carrying conductors if possible. (An external
field of 40 A/m can cause an additional measurement error of 1% of full scale).
6. Make sure that the arrow marked on the clamp coupling points toward the correct
orientation for correct phase. (See Picture 5.1 )
7. Keep the clamp coupling more than 2.5 cm (1 inch) away from the conductor to be
tested and other nearby conductors.
8. Observe the current value and waveform on the instrument’s display. If desired,
select the lower range on the measurement instrument.

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6 Cleaning
Use soft patch, slightly moistened with soap water or alcohol, to clean the surface
of the A 1445 and leave it to dry totally, before using it.
Do not use liquids based on petrol or hydrocarbons!
Do not spill cleaning liquid over the A 1445!

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7 Service
For repairs under or out of warranty time please contact your Metrel distributor for
further information.
Name and address of manufacturer:
METREL d.d.
Ljubljanska cesta 77
SI-1354 Horjul
Tel.: [phone], fax.: [phone]
http://www.metrel.si
E-mail: [e-mail]

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8 Technical specifications
FEATURES
NOTES
DESCRIPTION
Length of the sensor
61 cm
Measuring range
30 A / 300 A / 3000A ac rms
Overscale
60A / 600A / 6000 A sinus
Sensitivities
33.3 mV / A; 3.33 mV / A; 0.33 mV / A
Bandwidth
1
10 Hz up to 8 kHz
Accuracy
2,3,4
+/-1 %
Linearity (10 % to 100 %)
2,3,4
+/-0,2 %
Position sensitivity
5
+/-2 % of full scale
Temperature dependency
7
+/-0.02 % of reading / ºC
External fields
6
+/- 1% of full scale
Noise (residual current)
2,4
<4 mV / <1 mV / <1 mV, equivalent to 0.12 A
(range 30 A) / 0.3 A (range 300 A) / 3 A
(range 3000 A)
Nominal output voltage
1 V at full scale
Minimum load impedance in
output
2
10 k(internal output is 150 )
Phase error
<1°@ 50 Hz
<10°@1.5 kHz
Crest factor
Up to 3.0
Electrical Security
Double insulation
EN 61010 –1000 V- Cat III- Contamination
Deg. 2
Environment Conditions
Sensor: Usage and storage: -20 to 85 ºC
and 15 % to 85 % RH (without condensing)
Module: Usage and storage: -20 to 70 ºC
and 15 % to 85 % RH (without condensing)
Weight of flexible sensor
< 130 g
Water and dustpruffing
Sensor: IP 64 Module: IP 40
1: Limits of bandwidth corresponding to a relative gain > - 3 dB
2: Reference conditions: 45 Hz –65 Hz, conductor is in the center and preipedicular to
the measuring head, temperature between 15 ºC to 25 ºC; 10 kof load impedance;
laboratory environment electrical noise free.
3: Error of reading in reference conditions.
4: Expression of error measurement in refence conditions
error % = ( Iresidual / I measured ) x 100 + linearity + Accuracy
5: Distance between cable and clamp coupling should be 25 mm (1").
6: Adjacent conductor ≥ 20 cm or 8 inch from head.(<40 A/m)
7: No additional error in range 15 ºC –25ºC,
for higher temperatures: Temp. error = (Temp - 25ºC ) * Temperature dependency
for lower temperatures: Temp. error = (15ºC - Temp ) * Temperature dependency

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