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Neilsen Kuljian

NK Technologies' APN Series of power monitors is a big step forward from analog signal reporting to a digital format. The APN measures three phases of current and voltage and computes fourteen values necessary to track power usage. The monitor uses current transformers to measure the amperes. The line voltage connects directly to the transducer, up to 600 VAC.

NK Technologies APN Series Power Monitoring Measurement Transducers Distributors

Digital Power Monitoring with the Innovative APN Power Monitor

The result is 14 data points in the RS485 Modbus RTU format. There is also a pulse contact which opens and closes as watt hours are accumulated.

If you application requires an industry standard analog signal output proportional to the watts used, the APT Series of power monitors is the solution for you. It also measures three phases of current and voltage and uses current transformers to measure the amperes.

Both the APN and the APT can be configured to accept five amp secondary current transformers or the safer ProteCT low voltage output sensors. Either type of current sensing will produce an accurate output signal to help you identify areas of excessive energy consumption and allow intervention to reduce demand.


  • Modbus RTU output and LED display (APN Series)
  • 4-20 mA, 0-5 or 0-10 VDC output (APT Series)
  • Externally powered
  • Low profile reduces cabinet depth requirements
  • Finger safe terminals labeled for quick installation
  • Compact DIN mounted case

The APN and APT power monitors allow you to measure the power usage of a single piece of equipment, a system in a building, an area of a plant, or an entire facility.

NK Technologies AT/ATR-LS Series AC Large Split Core Current Transducers Distributors

The New AT/ATR-LS Current Transducer Combines a Current Transformer and Signal Conditioner, Ideal for Monitoring Large Loads

NK Technologies introduces the new AT/ATR-LS Current Transducer. The AT/ATR-LS combines a current transformer and signal conditioner that is great for monitoring large loads. The AT/ATR-LS is easy to install due to a large, split-core design that can be installed over existing conductors without disconnecting the load, even in applications with multiple conductors per phase.

"The AT/ATR-LS design saves valuable time for installers; they simply the top portion of the sensing ring, place the conductors inside and snap the top back in place," says Phil Gregory, President, NK Technologies. "The base can be snapped onto a DIN rail or attached to the control panel with screws. Either method provides a solid and secure way to measure the current use of the load. The transducer can also be simply suspended from the conductors if needed."

The AT/ATR-LS Current Transducer is ideal for monitoring large machines as it measures the current use to detect over or under current conditions. For water delivery and treatment, the AT/ATR-LS detects open discharge lines and can see clogged filters or blocked pump intakes. In generators, it keeps the power system running by monitoring output, and can be used to signal over loaded conditions.

The new AT/ATR-LS Current Transducer features industry standard output, loop-power, factory calibration, a split-core case and DIN rail mount. The transducer uses two wires to connect to the power supply and the load: programmable logic controller, panel meter or data acquistion system. Designed to meet UL, CUL, and CE requirements, the AT/ATR-LS can be used worldwide.

NK Technologies ASM Series Self Calibrating Smart Current Switches Distributors

Switch Automatically Adjusts Trip Point

NK Technologies' newly re-designed ASM Series Smart-Switch uses a new self-calibrating and self-powered switch to eliminate the need to manually adjust the sensor trip point, and is compatible with any automation system. The self-calibrating switches use the actual load current to set the trip point and provide the simplest way to ensure that a motor is working properly.

Because the current sensing Smart-Switches are self-powered and self-calibrating, they speed start-up and minimize installation costs. Three models are available to provide status monitoring, overload or underload, or operating window (overload and underload) functionality to suit particular pump, fan, heating element, conveyor or multi-load safety-interlocked application needs. The output contact is AC and DC compatible for use with any automation system.

The ASM sensor slides or snaps over one conductor feeding the load. The contact controls the input voltage, AC or DC, to 135 volts to a controller or small relay. It takes just seconds of steady running conditions before the sensor locks onto the normal current level. If the load draws more current than normal or the current drops significantly, the sensor output will open. If the current falls below 85% of normal or increases above 125% of normal the contact will open, with no manually setting trip points and no adjustments needed unless a motor is replaced. Should a motor be replaced calibration is very easy, and within a matter of minutes the system is back in operation.

NK Technologies CT-MS & CT-LS Series 1 A & 5 A Secondary Current Transformers Distributors

Measure Heavy Loads up to 1600 Amps Safely & Reliably with NK Technologies' Large Aperture, Split-Core Sensors

The split-core design of the NK Technologies' large aperture current sensing switches, transducers and transformers make installation a snap. Whether installing over existing conductors or bus bars or in new control systems, installation is simple and quick. Just remove the top portion of the sensing ring, place the conductors inside, and snap the top back in place. There is no need to disconnect the load, even in applications where there are multiple conductors per phase.

The innovative modular design features two sizes of sensing rings, which can be mounted to a common base. The rings are also used to enclose the core and windings of a current transformer. This design approach allows NK Technologies to offer these split-core models, all with ranges up to 1600 amps. The smaller of the two rings (MS models for medium split-core) measures 1.19 inches (30.1mm) wide and 2.22 inches (56.4mm) high. The larger ring measures 2.3 inches (58.4mm) wide and 3.42 inches (86.9mm) high.

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Contrinex RFID

Transponders are available in standard as well as high-performance all-metal versions. They permit operation in particularly difficult operating conditions. Very rugged smooth cylindrical housing of stainless steel V2A. High-performance models: hermetically closed housing (IP 68 & IP 69K) of food-safe and corrosion-resistant stainless steel V4A (AISI 316L); suitable for high-temperature applications (up to +125 °C).

SUNX Sensors

A Red Semiconductor Laser is used as the emitting device and CCD is used as the receiving device. An ideally parallel optical beam is emitted enabling high accuracy measurement. FDA standard (Class II) conforming model LD-601 is available. Safety countermeasures, such as protective gear, etc., are not required since LD-600 uses a Class 1 laser as per JIS standards, and LD-601 uses a Class II laser as per FDA standards.