Current sensor for dc current measurement

The CTH current sensors convert dc current to an isolated voltage 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 50A to 40000Adc. The current 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-5kHz (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.

CTH Type 4 mini and CTH Type 8 mini (split core) Hole: 28.5mm (1.125") round hole Outer: 102 mm (4") x 80mm (3.125") x 19mm (0.75") Current ranges: 50 / 100 / 200 / 300 / 400A	CTH Type 4 and CTH Type 8 (split core) 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 4 maxi and CTH Type 8 maxi (split core) 57.17mm (2.25") hole Outer: 136.5mm (5.375") x 133.3mm (5.25") x 41.27mm (1.625") Current ranges: CTH / 200 / 300 / 400 / 500 / 800 / 1000 / 1500 / 2000 / 2500A
Type 8 mini split core DC-400Hz	Type 8 split core DC-400Hz
CTH Type 9 (split core) 107.95mm (4.25") round hole Outer: 196.85mm (7.75") x 184.15mm (7.25") x 41.27mm (1.625") Current ranges: CTH / 300 / 400 / 500 / 800 / 1000 / 1500 / 2000 / 2500 / 3000A	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
Type 9 split core DC-400Hz	Type 10 & 11 split core DC-1kHz

Signal conditioner terminal connections

wpe2.gif (4244 bytes)

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: 50A / 100A / 200A / 300A / 400A / 500A / 800A / 1000A / 2000A / 3000A / 4000A / 5000A / 6000A / 10000A / 20000A / 25000A / 30000A / 35000A / 40000A Amps peak
Outputs	0-100mV, 0-1V, 0-5V, 0-10V and 4-20mA 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	5kVpk 1 min 50/60Hz
Power input	12Vdc / 24Vdc / 48Vdc / 72Vdc / 110Vdc / 125Vdc / 250Vdc / 115Vac / 230Vac - 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)
Protection	Input fuse, power input polarity diode, spike suppression
Frequency response	DC-5kHz depending on exact model
Adjustment	Internal dc offset and gain controls
Mounting	All signal conditioners and sensors have fixing points
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 4: 50mm diameter 1000A – Sensor has integral signal conditioner supplied with 2M cable

Available split core hole sizes

Type 8 mini: 28.5mm dia 100A - 400A Sensor has integral signal conditioner supplied with 2M cable
Type 8: 50mm / 2" dia 400A - 1000A Sensor has integral signal conditioner supplied with 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

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 -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

CTH / 500A / 4-20 / TH / 24Vdc type 8	500Adc input, 4-20mA output, through hole 2", 24V aux power input, core type 1 (13.5 x 10mm)
CTH / 400A / 10 / TH / 48Vdc type 4	400Adc input, 0-10V output, through hole, 48Vdc aux power input core type 4 (50mm hole dia)

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