Knick High voltage amplifier with galvanic isolation |
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High-voltage isolation with the new
TransShield® technology VariTrans® P 40000 for galvanic isolation and standardization of voltages and currents at a high potential. Working voltages up to 3600 V AC/DC and test voltage up to 15 kV AC, calibrated range selection and VariPower® broad-range power supply, extreme efficiency compressed in a compact modular housing – with a unique combination of product features, Knick's new VariTrans® P 40000 series shows what is possible today in isolators with high isolation capability. The universal devices transmit voltages and currents, ensure galvanic isolation with high isolation and convert the input signal with high accuracy into a standardized output signal. In this series, Knick relies on the newly developed TransShield® technology which compared to conventional designs enables very compact high-voltage transformers with low leakage. Thanks to the resulting space advantage, the P 41000 shunt isolators can be installed in an only 22.5 mm wide modular housing. Another substantial advantage of this technology: high transient overvoltages (common-mode interference) are reliably isolated and cause hardly any measurement errors at the output. The term T-CMR (Transient Common Mode Rejection) is defined for the corresponding data specification. It describes the quotient between differential DC gain and common-mode gain of a transient interference signal with a rise speed of 1000 V/µs. The VariTrans® P 40000 series devices achieve a T-CMR of 115 dB here; the common-mode rejection for 50 Hz disturbances is 150 dB. A highly functional and unique feature of high voltage isolators is the calibrated range selection: 16 input/output signal combinations can be easily selected with a rotary coding switch on the front of the device. Tedious on-site adjustment using a screwdriver, calibrator, or multimeter is no longer required. There are no drift problems due to instable trim components (e.g. potentiometers). Easy scalability of the range selection supports customized solutions; optimally adapted to the respective application, up to 16 tailor-made signal combinations can be implemented in one device. Maximum flexibility and direct added value for the user is also provided by the integrated 20 to 253 V AC/DC broad-range power supply. This ensures trouble-free operation with alternating or direct voltages everywhere in the world and provides for maximum safety even in unstable power supply networks. Installation is also safe and easy: Incorrect assignment of the mains voltage is practically excluded; expensive downtimes and repairs during commissioning are avoided. Vacuum encapsulation protects the circuitry against environmental influences and reliably ensures the high insulation strength required for working voltages up to 3600 V AC/DC. At the same time, not only the safety regulations stipulated in EN 61010-1 but also the regulations of the EN 50124-1 standard (insulation coordination for railway applications) are observed. Thus the isolators are excellently equipped for galvanically isolated measurements in railway transportation technologies up to a voltage of 3000 V DC. To prove insulation according to specification, a 100% routine test is carried out with a voltage of 15 kV AC (fixed range models) and 10 kV AC (switchable models) respectively. The vacuum encapsulation technology employed by Knick provides maximum long-term protection against aggressive environmental influences, shock and vibrations. Also in the new VariTrans® P 40000 series, the switching technology and device construction ensure excellent transmission quality that is reflected, among other things, in the zero stability, linearity, long-term stability, frequency response, and immunity to interference. Thanks to the high cut-off frequency of the devices, the signal form on the input is reproduced on the output without distortion. Fast changes in the input signal are converted almost without delay into a corresponding change in the output signal. In the input signals, the new Knick high-voltage isolators provide a wide measurement range: from a millivolt range – for example for the measurement of large currents via shunt resistances – to high voltages in the kilovolt range; currents up to 5 A can be measured directly. Analog unipolar and bipolar (standard) signals are available at the output of the high voltage isolators. The planner or user can select any combination from the input and output signal and thus take into account the individual conditions of use flexibly. The VariTrans® P 40000 series is interesting for applications in the monitoring and control of electric drive systems that can be operated with medium or high voltages. Further applications can be found in railway power supply. Main tasks include voltage monitoring or measurement of operating and fault currents in direct current switchgear. This device class offers previously unknown efficiency and flexibility which support the user optimally in the development of his product or system solution. The series For different measuring ranges and standard requirements, three series in 22.5 to 67.5 mm wide housings are offered – either as variants with fixed settings or as switchable version with calibrated range selection. The working voltage for fixed range models is 3600 V AC/DC (test voltage 15 kV AC), and 2200 V AC/DC (test voltage 10 kV AC) for switchable models. Impressed 0 to ±20 mA, 0 to ±10 V, or 4 to 20 mA signals are available at the output. Customer-specific devices can be equipped with up to 16 freely selectable signal combinations. VariTrans® P 40000 The new reference for high voltage isolation. Powerful as well as flexible. With a unique combination of product features: • Universal usability: input 60 mV up to 3600 V as well as 100 mA up to 5 A • New TransShield® technology enables extremely compact modular housing • Working voltages up to 3600 V AC/DC • Protection against electrical shock through Safe Isolation up to 1800 V AC/DC • Increased test voltages up to 15 kV AC • Excellent transmission properties:
• Practically no influence from common-mode voltages: CMRR > 150 dB • High immunity to transient interferences: T-CMR > 115 dB • Tremendous flexibility provided by
• Reliable function even with unstable supply • No destruction in the event of erroneously incorrect mains voltage • Switchable types reduce variety of versions, thus saving storage costs • Robust thanks to vacuum encapsulation • Suitable for direct current railway systems up to 3000 V DC • Mechanically stable for operation on ships, rail vehicles, and land crafts • Warranty: 5 years Knick is the supplier of Analyse Transmitters for pH, Oxygen and Conductivity. Knick is also the supplier for Galvanic Isolation, Display's and Lab meters. Knick and Elscolab are partners for many years. |
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