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Model RCTrms flexible "rope type" current transformer for fast clip-around installation with true rms output for process control, arc furness and induction heating
The RCTrms is an slim flexible AC Rope CT (flexible current transducer) for semi-permanent or permanent installation
Description
The RCTrms is an AC Rope CT (current transducer) for permanent installation. Simple to install and easy to retrofit, it combines the benefit of a thin, flexible, clip-around Rogowski (sense) coil with a signal conditioner providing accurate, true rms measurement of ac current.
The RCTrms has an industry standard 0-5V or 4-20mA dc output making it ideal for process control, status alarming or system monitoring purposes. Typically the RCTrms is used with SCADA systems, PLCs, data loggers and protection equipment. The RCTrms gives a dc output proportional to the true rms of the primary current and has these advantages:
- Easy to retrofit
- Simple to install in applications where space is limited
- The size of the Rogowski coil can be specified independently of the primary current
- Does not suffer from magnetic saturation
- Intrinsically safe
- Ideal for process control, status alarming or system monitoring for a variety of applications
- From arc furnaces to power distribution
The available RCTrms current ranges are 0-100A to 0-50,000Apk, also providing accurate measurement over a wide bandwidth ensuring precise measurement even with harmonically distorted waveshapes - using a flexible clip-on sensing coil.
The RCTrms sensor can provide all popular process control voltage and current loop outputs along with custom output options. Because the current sensors are split core, installation is possible without shutting down the electrical supply - saving down-time costs. Typical applications are retrospective energy monitoring in factories, offices, process control systems like PLC, SCADA Data logging systems, all where power, energy and current monitoring is important. Typical loading situations are factories, shops, offices, ac/dc VFD drives, ultrasonics, welding, power conversion and power distribution. For all RCTrms models, a NIST/NPL (UKAS) traceable calibration certificate and certificate of conformance is supplied. All RCTrms sensors use UL or CSA approved materials.
For level sensing, alarm and threshold monitoring please see Trip relay
Specifications
- Rated current (rms): 100Arms to 50kArms
- Rated output (Full scale FS): 4 to 20mA
- Output limit: 150% FS (28mA)
- Supply voltage (wide input): 12Vdc (-10%) to 24Vdc (+20%)
- Maximum input power: 0.7W (at rated output)
- Operating temperature range: –5℃ to +65℃ (Integrator electronics) –20℃ to +80℃ (Coil and cable)
- Bandwidth (-3dB): 2Hz to 100kHz
- Max. Response time (10 to 90%): 1000ms
- Accuracy (typ.): ±1.5% of reading (5% to 150% FS, 25℃)
- Output load: < 300 ohm
- Coil Length: 300mm, 500mm or 700mm (Custom lengths available)
- Cable Length (coil to integrator): 1m or 2.5m (Custom lengths available)
Features
- Traceable calibration (certificate included)
- No magnetic materials means excellent linearity < 0.2% reading
- Fully isolated measurement
- Isolated power supply 2kVdc
- Coil rated at 2kVpeak (withstand test is 4kVrms / 50Hz / 60 sec)
- Small DIN rail (or panel mount) enclosure – UL94 V-0 rated
Options
- IP65 die-cast aluminium panel mount enclosure (previously known as the IRF)
- Isolated BNC-BNC cable split option between coil and electronics to enable ease of installation e.g. threading through existing conduit. Standard cable permanently fixed.
RCTrms Current sensor order codes
RCTrms / range / output / power supply / coil length mm
1000A range, 0-5V output with 24Vdc power and 500mm coil length = RCTrms / 1000 / 005 / D24 / 500
-NEW-
Optional 3.5mm diameter 100, 200 or 300mm sense coils
* to meet CE / UL safety requirements, an external power adapter is supplied for 125Vdc, 110Vac and 230Vac options
All products have CE, IEC, EN, ASME or BS approvals.
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