DC current sensors, dc current transducers, dc current probes
 

Converting dc and ac current to an isolated 0-100mV, 0-1V, 0-2V, 0-5V, 0-10V, 0-20mA, 4-20mA, 4-12-20mA or 5-25mA signals

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The CTH sensors convert dc and ac current to an isolated voltage or mA output with the ability to track ac waveshapes. The CTH output is a faithful reproduction of the measured current, whether ac or dc. All popular process control voltage and current loop outputs are available. Through hole or split core options mean that connection is non-intrusive and straightforward. The available input range of the CTH sensors is any value from 1A to 40000Adc. Optional dc offset control allows nulling of residual dc current to ensure best use of the output span. The sensor power input is designed to operate over a wide voltage range associated with process control and sub-station auxiliary dc supply systems. Active Hall Effect sensor technology allows measurement from DC-150kHz (depending on the sensor type) along with fast step response.  The CTH can be used to provide an instantaneous output for ac currents. Typical applications are found in process control systems like PLC or SCADA, transportation, telecommunications, dc drives, welding and circuit breaker trip coils. For all CTH models, a NIST/NPL (UKAS) traceable calibration certificate and certificate of conformance is supplied.

For level sensing, alarm and threshold monitoring please see Trip relay
 

CTH split core Type 5

Hole diameter 21mm (0.83") Overall size 204mm (8.03") x 65mm (2.55") x 38mm (1.5")
Current ranges: 20A / 30A / 40A / 50A / 100A / 200A / 300A / 400A split core models.

CTH through hole core Type 1

Type 1: Hole: 13.5mm (0.53") x 10mm (0.39")
Overall size 145mm (5.71") x 95mm (3.74") x 38mm (1.50").  Type 1 current ranges: 1A / 2A / 5A / 10A / 20A / 30A / 40A / 50A / 75A / 100A

CTH Type 2

Type 2 current ranges: From 0-5A to 0-600A, 25.5mm dia

CTH/200/4-20/SC/24V dc split core current sensor

Type 5 split core DC-25kHz (internal filter 1500Hz).
As standard the sensor is supplied connected via a 90cm (36" cable)



 

CTH 50A through hole dc current transducer

Type 1 through hole DC-100kHz (internal filter 1500Hz)
Sensor is box mounted





Type 2 - 24.5mm through hole DC-150kHz (internal filter 1500Hz)
As standard the sensor is supplied connected via a 30cm (12" cable)
 

CTH split core Type 6

Hole: 104 (4.09") x 40mm (1.57") Outer: 159mm (6.26") x 85mm (3.35") Current ranges: From 200A to 4000A

CTH split core Type 7

Hole: 163mm (6.42") x 50mm (2")Outer: 233mm (9.17") x 95mm (3.74") Current ranges: From 500A to 4000A

CTH Type 4 mini and CTH split core Type 8 mini

Hole: 28.5mm (1.125") round hole.  Outer: 102 mm (4") x 80mm (3.125") x 19mm (0.75") Current ranges: 100 / 200 / 300 / 400A

CTH 500 - 3000A split core dc current transducer
Type 6: DC-10kHz   Type 7: DC-4kHz   (internal filter 1500Hz).
As standard the sensor is supplied connected via a 30cm (12" cable)

CTH 50mm dia hole 500A - 2500A dc current transducer
Type 8 mini split core DC-400Hz



 

CTH Type 4 and CTH split core Type 8

Hole: 50mm (2") round hole Outer: 127mm (5") x 105mm (4.125") x 31.75mm (1.25")
Current ranges:
CTH / 200 / 300 / 400 / 500 / 800 / 1000 / 1500 / 2000 / 2500A

CTH Type 9z

Hole: 115mm x 33mm (4.5" x 1.25") rectangular hole
Outer: 199mm x (7.83") x 99mm (3.90") x 34mm (1.34")
Current ranges:
CTH / 200 / 300 / 400 / 500 / 800 / 1000 / 1500 / 2000 / 2500A / 3000A

CTH 50mm dia hole 500A - 2500A dc current transducer
Type 8 split core DC-400Hz

 



Type 9z split core DC-400Hz

CTH Type 8F

Hole: 57mm (2.25") round hole Outer: 137mm (5.375") x 134mm (5.25") x 42.00mm (1.625")
Current ranges: CTH / 200 / 300 / 400 / 500 / 800 / 1000 / 1500 / 2000 / 2500A

CTH Type 8EE

Hole: 108mm (4.25") round hole Outer: 184mm (7.25") x 159mm (6.25") x 42.00mm (1.625")
Current ranges: CTH / 200 / 300 / 400 / 500 / 800 / 1000 / 1500 / 2000 / 2500A



Type 8F split core DC-400Hz

 



Type 8EE split core DC-400Hz
 

CTH split core Type 10

CTH Hole size 140mm (5.5") x 203mm (8"). Outer 254 (10") x 350 (13.75")
Current ranges 5000A / 6000A / 7000A / 8000A / 9000A / 10000A / 15000A / 20000A

CTH split core Type 11

CTH aperture 330mm (13") x 330mm (13").  Outer 534mm (21") x 534mm (21")
Current ranges 25000A / 30000A / 35000A / 40000Adc

CTH 5000A to 40000A dc transducer core
Type 10 & 11 split core DC-1kHz

 

ISCTH Type 8 ATEX and UL approved for Instrinsically safe environments

50mm (2") round hole Outer: 127mm (5") x 105mm (4.125") x 31.75mm (1.25")
Current ranges:
CTH / 100 / 200 / 300 / 400 / 500 / 800 / 1000 / 1500 / 2000 / 2500A

 <<< NEW PRODUCT >>>

Model ISCTH type 8 intrinsically safe, models from 100A to 2500A
ISCTH datasheet




Molded integral cable for intrinsically safe connection


 

Signal conditioner terminal connections

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Terminals from left to right:
output + / output - / power input ground -ve / power input positive +ve

Input and output grounds are isolated 250Vdc

Signal conditioner overall size 145mm (5.71") x 65mm (2.56") x 38mm (1.50")
 
 


 

DC current transducer general specifications

Ranges Depending on core type:  1A / 2A / 5A / 10A / 20A / 30A / 40A / 50A / 100A / 200A / 500A / 1000A / 2000A / 3000A / 4000A / 5000A / 6000A / 10000A / 20000A / 25000A / 30000A / 35000A / 40000A  Amps peak  
Outputs 0-100mV, 0-1V, 0-2V, 0-5V, 0-10V or 0-20mA, 4-20mA or 5-25mA outputs. All CTH outputs can be bipolar / instantaneous. Non-standard outputs are available.
Core type Through hole or split core clamp type, based on dc Hall Effect sensing
Insulation voltage rating Type 1, 2 & 5 rated insulation (Galvanic) 2.5kVpk 1 min 50/60Hz.   Type 6 & 7 3kVpk 1 min 50/60Hz. Type 4 & 8 5kVpk 1 min 50/60Hz
Power input 5V / 12Vdc / 24Vdc / wide range 9-36Vdc / 48Vdc / 72Vdc / 110Vdc  / 125Vdc /  250Vdc / 115Vac /  230Vac - all fuse, polarity and surge protected
Accuracy 0.5% for a non split core, 1.0% for a split core.  Conditions +23C 5C, traceable to UKAS NPL/NIST USA
Working temperature range Typically -20C - 65C (can be extended, check for exact model).  Functional temperature range 20C - 70C (check for each model). CTH types 1 & 2 are –40C - 85C (sensor head only)
Protection Input fuse, output fuse, power input polarity diode, spike suppression
Frequency response Depending on sensor type/model.  Type 1 & 2 DC- 150kHz max.  Type 5, 6, 7, 8 & 9  split cores are DC-10kHz max.  Standard HF cut-off filter is 1.5kHz (other values available)
Adjustment Internal dc offset and gain controls
Mounting All signal conditioners and sensors have fixing points.  Current sensors up to 400A can be mounted on the signal conditioner case or via a cable.
Approvals CE Marked, IEC1010 cat II & IEC348, UL/CSA rated materials.  Self extinguishing materials to UL94V0
Warranty 2 year warranty

 

Available through hole sizes (some not pictured above)

Type 1: 13.5 x 10mm rectangular  1A – 100A – Supplied attached or separate to conditioner
Type 2: 24.5mm  diameter  5A - 600A – supplied with 1 metre (39") from sensor - signal conditioner
Type 4 mini: 28.5mm / 1.125" diameter  100A - 400A Sensor has integral signal conditioner supplied with 2.4M cable
Type 4: 50mm diameter / 2" diameter 100A - 3000A Sensor has integral signal conditioner supplied with 2.4M cable

Available split core hole sizes

Type 5: 21mm dia  20A - 400A supplied with 1 metre (39") cable from sensor - signal conditioner
Type 6: 104 x 40mm  500A - 3000A supplied with 1 metre (39") cable from sensor - signal conditioner
Type 7: 163 x 50mm  500A - 4000A supplied with 1 metre (39") cable from sensor - signal conditioner
Type 8 mini: 28.5mm / 1.125" dia  100A - 400A  Sensor has integral signal conditioner supplied with 2.4M cable
Type 8: 50mm / 2" dia  100A - 3000A Sensor has integral signal conditioner supplied with 2.4M cable
Type 8F (maxi): 57.15mm / 2.25" dia  400A - 3000A Sensor has integral signal conditioner supplied with 2.4M cable
Type 8EE: 108.00mm / 4.25" dia  400A - 3000A Sensor has integral signal conditioner supplied with 2.4M cable
Type 9z:
115mm (4.5") x 33mm (1.25")  200A - 3000A Sensor connects to signal conditioner via 2.4M cable
Type 9: 76.2 x 165.1mm / 3" x 6.5"  2500A - 5000A Sensor has integral signal conditioner supplied with 2.4M cable
Type 10: 140mm (5.5") x 203mm (8")  5000A - 20000A Sensor connects to signal conditioner via 2.4M cable
Type 11: 330mm (13") x 330mm (13")  25000A - 40000Adc
Sensor connects to signal conditioner via 2.4M cable

Longer cable lengths available - on request

Current transducer order codes

The order code is based on:-

CTH / amps input / output / SC or TH /  power input + core type

SC = split core, TH = through hole (non-split core)

230Vac/dc & 115Vac/dc adapters are available (in this case the CTH will be supplied with 9-36Vdc input and ac adapter)

 

Options - Environmental

All models self extinguishing materials to UL94V0 and CSA
Extended temperature range -40C - 85C (not available for all sensor types)

Options – noise rejection and offset

Non standard input current
Non standard output voltage or current
User can specify upper or lower –3db point


Order code examples

CTH / 50A / 4-20 / TH / 24Vdc  type 1 50Adc input, 4-20mA output, through hole, 24V aux power input, core type 1 (13.5 x 10mm)
CTH / 400A / 10 / TH / 72Vdc  type 4 400Adc input, 0-10V output, through hole, 72Vdc aux power input core type 4 (50mm hole dia)
CTH / 2000A / 10 / SC / 110Vdc  type 7 2000Adc input, 0-10V output, split core, 110Vdc aux power input, type 7 core (163 x 50mm)


Download CTH Sensors PDF Datasheet

ISCTH datasheet

Spot checking large dc currents?
Visit
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http://www.powertekuk.com/dcsnapshot.htm

Spot checking of large DC current 2000A-300,000Adc systems


All products have CE, IEC, EN, ASME or BS approvals.
 

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