LogicBus/Productos/Power Measurement/Current Transducers/DC current sensors

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DC current sensors, dc current transducers, dc current probes

Converting dc current to an isolated 0-100mV, 0-1V, 0-2V, 0-5V, 0-10V, 0-20mA, 4-20mA or 5-25mA
The CTH sensors convert dc current to an isolated voltage output, the CTHR sensors convert ac current to a dc output signal proportional to the Arms. 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 5A to 6000Adc. 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-100kHz (>400A 25kHz) along with a 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.
CTH split core Type 5

Hole diameter 21mm (0.90") 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 and 2

Type 1: Hole: 13.5mm (0.53") x 10mm (0.39") Type 2: hole 24.5 diameter Overall size 145mm (5.71") x 95mm (3.74") x 38mm (1.50") Current ranges: 10A / 20A / 30A / 40A / 50A / 100A split core

Type 5 split core DC-25kHz (internal filter 1500Hz)
Type 1 through hole DC-100kHz (internal filter 1500Hz)


Type 2 - 24.5mm through hole DC-150kHz (internal filter 1500Hz)
CTH split core Type 6

Hole: 104 (4.09") x 40 mm (1.57") Outer: 159mm (6.26") x 85mm (3.35") Current ranges: CTH 500A / 800A / 1000A / 2000A

CTH split core Type 7

Hole: 163mm (6.42") x 50mm (2") Outer: 233mm (9.17") x 95mm (3.74") Current ranges: 1000A / 2000A / 2500A / 3000A

CTH split core Type 8

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


Type 6: DC-10kHz Type 7: DC-4kHz (internal filter 1500Hz)
Type 8 split core DC-400Hz
CTH split core Type 9

114.3mm (4.5") x 31.75mm (1.25") Outer 183mm (7.19") x 104mm (4.06") Current ranges: 500A / 600A / 800A / 1000A / 1500A / 2000A / 3000A / 4000A / 5000A

CTHR split core Type 10

CTHR 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

CTHR split core Type 11

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


Type 9 split core DC-1kHz
Type 10 & 11 split core DC-1kHz
IRF-rms converts instantaneous output sensors to a dc signal proportional to the rms. Suitable with dc and complex dc+ac signals
Bandwidth: DC-75kHz. Waveform crest factors: 1 - 5 Input range: 2mV to 50V input, Wide range of dc outputs: 0-100mV, 0-1V, 0-2V, 0-5V, 0-10V, 0-20mA, 4-20mA and 5-25mA 12, 24, 48 or 110Vdc power



Output +ve / Output ground / Input ground / Input +ve

Input and output grounds are isolated
Signal conditioner terminal connections



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")

CTHR current transducer general specifications

Ranges 1A / 2A / 5A / 10A / 20A / 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
Core type Through hole or split core clamp type, based on dc Hall sensing
Insulation voltage rating Rated insulation (Galvanic) to 2.5 kVpk 1 minute, 5kV possible for some models
Power input 12Vdc / 24Vdc / 48Vdc / 72Vdc / 110Vdc / 125Vdc / 250Vdc / 115Vac / 230 Vac - fuse and surge protected
Accuracy �0.5% for a non split core, �1.0% for a split core. Conditions +23�C �5�C, traceable to UKAS NPL/NIST USA
Working temperature range Typically -20�C - 50�C (can be extended, check for exact model). Functional temp range > �20�C - 70�C (check for each model)
Frequency response DC- 150kHz max, refer to sensor type, split cores are DC-25kHz max
Adjustment Internal dc offset and gain controls
Mounting Current sensors up to 400A can be mounted on the transducer case or via a 200mm cable externally, fixing points provided
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 � 125A � Supplied attached or separate to conditioner
Type 2: 24.5mm diameter 5A - 500A � Supplied attached or separate to conditioner
Type 3: 30mm diameter 10A - 800A � Supplied attached or separate to conditioner
Type 4: 50mm diameter 25A - 2500A � Sensor connects to signal conditioner via 2M cable

Available split core hole sizes

Type 5: 21mm dia 20A - 400A Supplied attached or separate to conditioner 0.5M max
Type 6: 104 x 40mm 500A - 3000A Sensor connects to signal conditioner via 0.5M cable
Type 7: 163 x 50mm 500A - 3000A Sensor connects to signal conditioner via 0.5M cable
Type 8: 50mm dia 500A - 2500A Sensor connects to signal conditioner via 2M cable
Type 9: 114mm x 31.75mm 500A - 5000A � Sensor connects to signal conditioner via 2M cable
Type 10: 140mm (5.5") x 203mm (8") 5000A - 20000A Sensor connects to signal conditioner via 2M cable
Type 11: 330mm (13") x 330mm (13") 25000A - 40000Adc Sensor connects to signal conditioner via 2M cable

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


Options - Environmental

Self extinguishing materials to UL94V0 and CSA
Extended temperature range -40°C - 85°C (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
External dc offset nulling control
CTHR 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 / 100A / 100m / SC / 72Vdc type 4 100Adc input, 0-100mV output, split core, 72Vdc aux power input core type 4 (21mm 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)