Earth leakage transducers
September 2005
Sensors & Transducers
LEM is offering the CT family of current transducers for use in a range of safety applications including solar installations. The new transducers measure an AC or DC leakage current of 30 mA or more (with possible spectral components up to 18 kHz) occurring when a solar panel is coupled to an earthed grid, or in failure modes such as a short circuit or earth fault. The connection of a solar panel to the grid raises concerns about the safety of the system and of any human contact with the system.
These differential current transducers have been specifically designed to meet the needs of modern solar topologies. They are PCB mountable, small (30 L x 30 H x 20 W mm), lightweight (25 g) components with an 11 mm diameter aperture for insertion of earth leakage wires. They can easily be integrated into the solar inverter and have been designed to make single-phase or three-phase differential current measurements on conductors carrying up to 30 A/wire (AC or DC).
The CT 0.1-P, CT 0.2-P and CT 0.4-P safely measure currents with nominal values of 100, 200 and 400 mA respectively (1% typical accuracy at +25°C without offset), to trigger the safety system in the event of a high leakage current. LEM's CT range is also suitable for other applications, including medium power inverters for symmetry fault detection or in power sources for failure detection.
The transducers are CE marked, conform to the EN 50178 standard and are recognised for industrial applications. LEM Components offers a five-year warranty for each transducer.
Further reading:
Next-generation condition monitoring
Sensors & Transducers
The next generation Sitrans MS200 multisensor from Siemens is setting new standards in condition monitoring.
Read more...
Telco sensors for blocked/empty chute detection
Sensors & Transducers
Telco sensors overcome the problems of contaminated environments through powerful high-performance infrared sensors that ensure penetration of harsh pollution and guarantee reliable detectio
Read more...
Cleaning solutions for optical sensors
Endress+Hauser South Africa
Sensors & Transducers
Achieving accurate and continuous process visibility requires reliable sensor performance, even in challenging media. Endress+Hauser’s CYR51 mechanical cleaning unit addresses these challenges by providing stable, automated cleaning of turbidity and UV-Vis absorption sensors.
Read more...
Next-generation gas meter module
Sensors & Transducers
Sensirion has launched its new gas meter module combining a low-power consumption mode, future-ready compatibility and seamless integration, all within the same compact form factor.
Read more...
Adjustable proximity sensor with five metre range
Gail Norton Instrumentation
Sensors & Transducers
The Telco line of photo-electric eyes have the accuracy and reliability you need.
Read more...
Food safety – a matter of weight
Sensors & Transducers
Weighing systems play a key role in ensuring product quality in food production, complying with legal requirements and avoiding product recalls. The Minebea Intec MiNexx portfolio has been specially developed to meet these requirements.
Read more...
Telco sensors in the paper and pulp industry
Gail Norton Instrumentation
Sensors & Transducers
The paper and pulp industry poses a major problem for most photoelectric sensors. Telco Sensors has overcome this with its powerful and high-performance photoelectric sensors, ensuring penetration of thick and harsh pollution while guaranteeing reliable detection.
Read more...
Leaders in sensor technology
Gail Norton Instrumentation
Sensors & Transducers
A new addition to the Telco Sensors range is the adjustable Proximity sensor, with a range up to 5 metres.
Read more...
Cutting-edge sensor technology
Endress+Hauser South Africa
Sensors & Transducers
The advantage of Endress+Hauser’s Memosens technology is that digitised measured values and sensor information are transmitted via a non-contact connection from the sensor to the cable, and as a digital signal to the transmitter.
Read more...
Miniature inductive sensors
ifm - South Africa
Sensors & Transducers
The inductive IY/IZ type sensors from ifm are used in various industrial areas where space is limited.
Read more...
printer friendly version