When your job is to control motors, heaters, lamps and other electrically powered loads, you need accurate, real-time status feedback. Until recently, the traditional approach to this monitoring problem has been to use optical sensors, zero-speed switches and pressure switches. But these devices can be both expensive and unreliable.

Now NK Technologies offers you better solutions. Our current, voltage and power sensors give you that critical feedback with all the speed, simplicity and dependability you want and need. Based on the premise that, "By measuring the power input to your load, you gain clear insight into actual equipment performance".

‘AT’ Current Transducers from NK Technologies combine a current transformer and signal conditioner into a single package. The AT Series has jumper selected current input ranges and industry standard 4–20mA, 0–5VDC or 0-10VDC outputs. The AT Series is designed for application on ‘linear’ or sinusoidal AC loads. Available in a split core case or two types of solid core cases.

'AT/ATR 3 & 4' transducers from NK Technologies combine a high capacity current transformer and a signal conditioner into a single package. The AT version is Average Responding for use on linear (sinusoidal) loads. The ATR version is True RMS for use on distorted waveforms found in VFD or SCR outputs. Available in a solid or split core case.

'DT' Current Transducers from NK Technologies combine a Hall effect sensor and signal conditioner into a single package. The DT Series has jumper selectable current input ranges and industry standard 0-20mA, 4-20mA, 0-3VDC, 0-5VDC or 0-10VDC outputs. Available in a split core package.

‘AS1’ Current Switches from NK Technologies combine a current transformer, signal conditioner and limit alarm into a single package. The AS1 series has an extended current input range, universal solid-state outputs and a wide frequency response. Available in a split core case or two styles of solid core cases.

‘ASM’ Current Switches from NK Technologies combine a current transformer, signal conditioner and self-calibrating limit alarm into a single package. The ASM Series has an extended current input range, universal solid-state outputs and a wide frequency response. Available in a split core or top terminal solid core case.

‘AS3’ Current Switches from NK Technologies combine a current transformer, signal conditioner and a limit alarm into a single package. The AS3 Series has three jumper selected current input ranges, solid-state AC output and a wide frequency range. Available in a split core or front terminal solid core case.

‘AS3M’ Current Switches are a multi-pole version of the popular AS3 Series. The AS3 Series combines a current transformer, signal conditioner and two limit alarms into a single package. The AS3 Series has three jumper-selected current input ranges, solid-state DC output and a wide frequency range. Available in a front terminal solid core case.

‘DS3’ Current Switches from NK Technologies combine a Hall effect sensor, signal conditioner and a limit alarm into a single package. The DS3 Series has three jumper selected current input ranges and frequency response from DC to 400Hz. Available in a top terminal solid core case with either a relay output or a universal solid state output.

Operating Principle: Under normal conditions, the current in the hot leg of a two-wire load is equal in strength but opposite in sign to the current in the neutral leg. These two currents create magnetic fields that are also equal but opposite. When the wires are next to each other, the fields cancel, producing a "Zero Sum Current". If any current leaks to ground from one wire (Ground Fault), the two currents become imbalanced and the result is a net magnetic flux or field. AG Series ground fault sensors monitor this field and alarm when leakage rises above setpoint. This concept applies to grounded 3-phase delta and wye systems.

The AutoPhase Advantage
AutoPhase makes power transducer installation simple. There are over 40 ways to wire up a 3 phase, 4 wire kW transducer. For example, reversing the orientation of a CT flips the output waveform, tricking ordinary watt transducers into thinking there is a 180 degree phase shift. Or if CT and voltage inputs are mismatched, the transducer thinks there is a 120 degree phase shift. Either way, you have a problem.

AutoPhase identifies the phases and polarity automatically and corrects for the error in software. This eliminates flashing "ERROR" lights, tedious and dangerous reconnecting of inputs. AutoPhase even tells you which CTs are reversed and which phases are mismatched!