Systems to be measured:

3 phase 3 wire balanced load 3 phase 4 wire balanced load 3 phase 3 wire unbalanced load

Re-Active Power E1-1VAR3 E1-1VAR4 E1-2VAR3

Function: The E1-VAR series converts Reactive Power (VI sin φ) into a proportional linear dc current output.

The measured AC current and voltage inputs are multiplied together using a pulse height/width system, resulting in a differential dc voltage proportional to Watts. A symmetrical dc amplifier converts this to a true constant current output.

The E1-VAR series transducers are ideally used in Computer and Data Acquisition applications. The polarity of the output signal changes from + to - when the direction of the power flow reverses. This is ideal for all requirements where either uni-polar or bipolar measurements are required. Front panel zero and span adjustment potentiometers are available as an optional extra.

Power supply: mains or DC

Function: The VVH-3 combines Power and Energy transducers in one compact housing. The instrument provides two outputs; one a proportional, linear and highly accurate dc current output representing the measured VAR and the other a VAR-Hour measurement. The VAR-Hour outputs can be either a volt-free contact or an open collector output. The instrument has isolation between the inputs, output and power supply. The output section of the instruments can be calibrated for a wide range of inputs and the pulse rate of the output VAR-Hour measurement can also be calibrated to suit the required scale. Advanced circuit design gives the VVH-3 true 0.1% accuracy for both VAR and VAR-Hour measurement. The VVH-3 is housed in polycarbonate plastic enclosures suitable for DIN rail or bulkhead mounting.

Power supply: mains or self

Systems to be measured:

Single Phase 3 phase 3 wire balanced load 3 phase 4 wire balanced load 3 phase 3 wire unbalanced load 3 phase 4 wire unbalanced load

Active Power E1-1W0 E1-1W3 E1-1W4 E1-2W3 E1-3W4

Function: The E1-W series converts Active Power (VI cos φ) into a proportional linear dc current output.

The measured AC current and voltage inputs are multiplied together using a pulse height/width system, resulting in a differential dc voltage proportional to Watts. A symmetrical dc amplifier converts this to a true constant current output.

The E1-W series transducers are ideally used in Computer and Data Acquisition applications. The polarity of the output signal changes from + to - when the direction of the power flow reverses. This is ideal for all requirements where either uni-polar or bipolar measurements are required. Front panel zero and span adjustment potentiometers are available as an optional extra.

Power supply: mains or DC

Function: The WVT-3 combines Watt and VAR transducers in one compact housing. The instrument provides two simultaneous proportional, linear and highly accurate dc current outputs extracted from the voltage and current inputs and their relative phase angle. The polarity of the Watt output is positive for unity power factor; polarity for the VAR output is positive for a lagging power factor. The instrument has isolation between the inputs, output and power supply, and with the high common mode rejection ratio and a high degree of filtering provides a low ripple output current. The output section of the instrument is an interchangeable module. This module offers a wide range of output formats without having to re-calibrate the instrument. Advanced circuit design gives the WVT-3 true 0.1% accuracy for both Watt and VAR measurement. The WVT-3 is housed in a polycarbonate plastic enclosure suitable for mounting on DIN rail.

Power supply: mains or self

Function: The WWH-3 combines Power and Energy transducers in one compact housing. The instrument provides two outputs; one a proportional, linear and highly accurate dc current output representing the measured Watt and the other a Watt-Hour measurement. The Watt-Hour outputs can be either a volt-free contact or an open collector output. The instrument has isolation between the inputs, output and power supply. The output section of the instruments can be calibrated for a wide range of inputs and the pulse rate of the output Watt-Hour measurement can also be calibrated to suit the required scale. Advanced circuit design gives the WWH-3 true 0.1% accuracy for both Watt and Watt-Hour measurement. The WWH-3 is housed in polycarbonate plastic enclosures suitable for DIN rail or bulkhead mounting.

Power supply: mains or self

Function: Electrical mains frequency to dc current or voltage converter. The measured input is isolated, filtered, squared-up and offered to a precision frequency to current converter. The current is amplified and compared to an accurate reference. A symmetrical dc amplifier converts the resultant to the required voltage or current output suited to driving meters, computer inputs and process control systems. Using the latest technology in converter integrated circuits, dc amplifiers and reference circuits, the E1-FREQ offers exceptional accuracy and stability with increased immunity to spikes and distorted waveforms. The E1-FREQ is housed in polycarbonate plastic enclosure suitable for mounting on DIN rail.

Power supply: mains or DC

Function: Frequency to Current converter which will convert AC Frequencies in the range of 10 Hz to 100 KHz into proportional, linear and highly accurate dc current output signals. The input signal is filtered, shaped and optically coupled to the processing section. The processor's clock is synchronised with the measured frequency pulse stream assuring overall accuracy of both the output and the instruments thermal stability performance. FTI-1 is also equipped with two set-points/relay outputs which can be configured for dead-band measurement, over-speed alarms, etc. The FTI-1 is housed in polycarbonate plastic enclosure suitable for mounting on DIN rail.

Power supply: mains powered

Function: Frequency to Current converter which will convert AC Frequencies in the range of 10 Hz to 100 KHz into proportional, linear and highly accurate dc current output signals. The input signal is filtered, shaped and optically coupled to the processing section. The processor's clock is synchronised with the measured frequency pulse stream assuring overall accuracy of both the output and the instruments thermal stability performance. FTI-1D is also equipped with two set-points/relay outputs which can be configured for dead-band measurement, over-speed alarms, etc. The FTI-1D features a 5 digit, seven segment LED display for local indication of the input in the form of RPM, frequency, velocity, etc.

Power supply: mains powered

Function: Self powered isolating transmitters which will convert AC Current inputs into proportional, linear and highly accurate current or voltage output signals. An internal transformer isolates the input from the output enabling the transmitter to withstand large momentary inputs. The input to output isolation also provides a high output signal-to-noise ratio which makes the transmitter highly immune to ground loop signals and RFI problems. Calibration is performed by means of one internal coarse range resistor and a multiturn potentiometer brought out to the front panel for fine tuning. The ACT-SI is housed in polycarbonate plastic enclosures suitable for mounting on DIN rail.

Power supply: self powered

Function: The APT-35L will convert a selected AC Signal into a proportional, linear and highly accurate 4 to 20mA current output signal. An internal transformer isolates the input from the output enabling the transmitter to withstand large momentary inputs. The input to output isolation, high surge current capability and high output signal-to-noise ratio makes the transmitter highly immune to ground loop signals and RFI problems. Site calibration is performed by means of Zero and Span multiturn potentiometers for fine tuning. The transmitter is equipped with a test terminal that enables the user to measure the output current without breaking the current loop. The test terminal gives a voltage output (measured across an internal 10 ohm resistor) proportional to the output current. The transmitter is housed in polycarbonate plastic enclosures suitable for mounting on DIN rail.

Power supply: DC powered

Function: Self powered isolating transmitters which will convert AC Voltage inputs into proportional, linear and highly accurate current or voltage output signals. An internal transformer isolates the input from the output enabling the transmitter to withstand large momentary inputs. The input to output isolation also provides a high output signal-to-noise ratio which makes the transmitter highly immune to ground loop signals and RFI problems. Calibration is performed by means of one internal coarse range resistor and a multiturn potentiometer brought out to the front panel for fine tuning. The ACT-SV is housed in polycarbonate plastic enclosures suitable for mounting on DIN rail.

Power supply: self powered

Function: 2 wire isolating transmitter which will convert an AC Voltage input into a proportional, linear and highly accurate 4 to 20mA current output signal. An internal transformer isolates the input from the output enabling the transmitter to withstand large momentary inputs. The input to output isolation, high surge current capability and high output signal-to-noise ratio makes the transmitter highly immune to ground loop signals and RFI problems. Calibration is performed by means of one internal coarse range resistor and Zero and Span multiturn potentiometers brought out to the front panel for fine tuning. The transmitter is equipped with a test terminal which enables the user to measure the output current without breaking the current loop. The test terminal gives a voltage output (measured across an internal 10 ohm resistor) proportional to the output current. The transmitter is housed in a polycarbonate plastic enclosure suitable for mounting on DIN rail.

Power supply: DC powered

Function: The E1-1C0 and E1-1C3 detect the electrical phase difference between the measured AC voltage and AC current signals and convert this into a signal which is then amplified into a proportional linear dc current or voltage output. The measured AC current and voltage inputs are squared up and chopped using a precision quadranture switching circuit resulting in a dual polarity pulsed current output. This is actively integrated and a symmetrical dc amplifier converts this into a true constant current output, linearly proportional to electrical degrees (non-linear to Cos-phi scale). The input and output ranges have been selected using the most commonly used specifications.

Power supply: mains or DC