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The CTHR sensors convert ac current to an isolated voltage or current loop output, offering a choice of proportional (rms) and instantaneous outputs. The CTHR can measure ac or ac+dc currents, with ranges from 5A to 5000Apk.
Both CTHR can provide all popular process control voltage and current loop outputs along with custom output options. A range of through hole or split core sensors means that connection is possible without shutting down manufacturing plants. Optional offset control allows nulling of residual ac currents to ensure best use of the output span (CTHR). 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, depending on the core type selected. Typical applications are process control systems like PLC or SCADA, current monitoring in ac/dc drives, ultrasonics, welding and circuit breaker trip coils. For all CTHR models, a NIST/NPL (UKAS) traceable calibration certificate and certificate of conformance is supplied. All CTHR use UL or CSA approved materials. |
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CTHR 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. |
CTHR 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 |
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Type 5 split core DC-25kHz (internal filter 1500Hz)
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Type 1 through hole DC-100kHz (internal filter 1500Hz)
Type 2 - 24.5mm through hole DC-150kHz (internal filter 1500Hz)
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CTHR split core Type 6
Hole: 104 (4.09") x 40 mm (1.57")
Outer: 159mm (6.26") x 85mm (3.35")
Current ranges: CTHR 500A / 800A / 1000A / 2000A
CTHR 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 |
CTHR split core Type 8
Hole: 50mm (2") round hole
Outer: 127mm (5") x 105mm (4.125")
Current ranges: CTHR / 500A / 800 / 1000 / 1500 / 2000 / 2500A |
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Type 6: DC-10kHz Type 7: DC-4kHz (internal filter 1500Hz)
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Type 8 split core DC-400Hz
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CTHR 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 |
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Type 9 split core DC-1kHz
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Type 10 & 11 split core DC-1kHz
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CTHR signal conditioner terminal connections
Output +ve / Output ground / Input ground / Input +ve
Input and output grounds are isolated |
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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 rms |
| Outputs |
0-100mV, 0-1V, 0-2V, 0-5V, 0-10V or 0-20mA, 4-20mA or 5-25mA outputs. Instantaneous outputs are voltage only, rms outputs can be voltage or current loop |
| Core type |
Through hole or split core clamp type, based on dc Hall sensing |
| Insulation voltage rating |
Rated insulation (Galvanic) to 2.5kVpk 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 |
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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)
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| 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
| CTHR / 50A / 4-20 / TH / 24Vdc |
50Arms input, 4-20mA output, through hole and 24Vdc aux power input |
| CTHR / 100A / 100m / SC / 72Vdc |
100Arms input, 0-100mV output, split core and 72Vdc aux power input |
| CTHR / 100A / 5-25mA / TH / 48Vdc |
100Arms input, 5-25mA output, through hole and 48Vdc aux power input |
| CTHR / 200A / 10 / SC / 110Vdc |
200Arms input, 0-10V output, split core and 110Vac aux power input | | |
