AC & DC Current Data Loggers and Sensors

Onset offers a range of AC and DC voltage data loggers to help keep building equipment up and running optimally and ensure facilities are operating safely and efficiently. Select a cost-effective, easy-to-use voltage data logger that meets your needs from the choices below.


Results: 1 to 16 of 20
  • UX120-006M

    The HOBO UX120-006M Analog Data Logger is a high-performance, LCD display data logger for building performance monitoring applications.

    As Onset’s highest-accuracy data logger, it provides twice the accuracy of previous models, a deployment-friendly LCD, and flexible support up to four external sensors for measuring temperature, current, CO2, voltage, and more.

    The data logger is ideal for energy audits, building commissioning studies, equipment scheduling, and more.

    Add Extended warranty for $13.90/unit?

    Yes No thanks

    (this choice will apply to all existing UX120-006M in your cartquote request)
    $139

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    UX120-006M Data Logger

    The HOBO UX120-006M Analog Data Logger is a high-performance, LCD display data logger for building performance monitoring applications.

    As Onset’s highest-accuracy data logger, it provides twice the accuracy of previous models, a deployment-friendly LCD, and flexible support up to four external sensors for measuring temperature, current, CO2, voltage, and more.

    The data logger is ideal for energy audits, building commissioning studies, equipment scheduling, and more.


    $139
    Add Extended warranty for $13.90/unit?

    Yes No thanks

    (this choice will apply to all existing UX120-006M in your cartquote request)

  • The Accu-CT split-core current transformer offers outstanding accuracy and one-handed operation.

    $45

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    T-ACT-0750-100 Sensor

    The Accu-CT split-core current transformer offers outstanding accuracy and one-handed operation.


    $45


  • The Accu-CT split-core current transformer offers outstanding accuracy and one-handed operation.
    $45

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    T-ACT-0750-020 Sensor

    The Accu-CT split-core current transformer offers outstanding accuracy and one-handed operation.


    $45


  • The Accu-CT split-core current transformer offers outstanding accuracy and one-handed operation.

    $45

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    T-ACT-0750-050 Sensor

    The Accu-CT split-core current transformer offers outstanding accuracy and one-handed operation.


    $45

  • T-ACT-0750-250

    The Accu-CT split-core current transformer offers outstanding accuracy and one-handed operation.

    $45

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    T-ACT-0750-250 Sensor

    The Accu-CT split-core current transformer offers outstanding accuracy and one-handed operation.


    $45


  • The small size 10 AMP split-core AC Current Transformer (CT) is mounted around a current carrying wire to measure AC amperage. This CT provides a .333 Volt AC output proportional to current flow and is used with Onset data loggers via the FlexSmart TRMS module and with kWh transducers (WattNodes) for True RMS measurement of sinusoidal and non-sinusoidal waveforms. The result is an accurate current measurement for many types of electrical equipment.

    $35

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    T-MAG-0400-10 Sensor

    The small size 10 AMP split-core AC Current Transformer (CT) is mounted around a current carrying wire to measure AC amperage. This CT provides a .333 Volt AC output proportional to current flow and is used with Onset data loggers via the FlexSmart TRMS module and with kWh transducers (WattNodes) for True RMS measurement of sinusoidal and non-sinusoidal waveforms. The result is an accurate current measurement for many types of electrical equipment.


    $35


  • The small size 20 AMP split-core AC Current Transformer (CT) is mounted around a current carrying wire to measure AC amperage. This CT provides a 0 to .333 Volt AC output proportional to current flow and is used with Onset data loggers via the FlexSmart TRMS module and with kWh transducers (WattNodes) for True RMS measurement of sinusoidal and non-sinusoidal waveforms. The result is an accurate current measurement for many types of electrical equipment.

    $35

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    T-MAG-0400-20 Sensor

    The small size 20 AMP split-core AC Current Transformer (CT) is mounted around a current carrying wire to measure AC amperage. This CT provides a 0 to .333 Volt AC output proportional to current flow and is used with Onset data loggers via the FlexSmart TRMS module and with kWh transducers (WattNodes) for True RMS measurement of sinusoidal and non-sinusoidal waveforms. The result is an accurate current measurement for many types of electrical equipment.


    $35


  • The small size 75 AMP split-core AC Current Transformer (CT) is mounted around a current carrying wire to measure AC amperage. This CT provides a 0 to .333 Volt AC output proportional to current flow and is used with Onset data loggers via the FlexSmart TRMS module and with kWh transducers (WattNodes) for True RMS measurement of sinusoidal and non-sinusoidal waveforms. The result is an accurate current measurement for many types of electrical equipment.

    $35

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    T-MAG-0400-75 Sensor

    The small size 75 AMP split-core AC Current Transformer (CT) is mounted around a current carrying wire to measure AC amperage. This CT provides a 0 to .333 Volt AC output proportional to current flow and is used with Onset data loggers via the FlexSmart TRMS module and with kWh transducers (WattNodes) for True RMS measurement of sinusoidal and non-sinusoidal waveforms. The result is an accurate current measurement for many types of electrical equipment.


    $35


  • The small size 50 AMP split-core AC Current Transformer (CT) is mounted around a current carrying wire to measure AC amperage. This CT provides a 0 to .333 Volt AC output proportional to current flow and is used with Onset data loggers via the FlexSmart TRMS module and with kWh transducers (WattNodes) for True RMS measurement of sinusoidal and non-sinusoidal waveforms. The result is an accurate current measurement for many types of electrical equipment.

    $35

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    Full Product Details
    T-MAG-0400-50 Sensor

    The small size 50 AMP split-core AC Current Transformer (CT) is mounted around a current carrying wire to measure AC amperage. This CT provides a 0 to .333 Volt AC output proportional to current flow and is used with Onset data loggers via the FlexSmart TRMS module and with kWh transducers (WattNodes) for True RMS measurement of sinusoidal and non-sinusoidal waveforms. The result is an accurate current measurement for many types of electrical equipment.


    $35


  • The small size 5 AMP split-core AC Current Transformer (CT) is mounted around a current carrying wire to measure AC amperage. This CT provides a .333 Volt AC output proportional to current flow and is used with Onset data loggers via the FlexSmart TRMS module and with kWh transducers (WattNodes) for True RMS measurement of sinusoidal and non-sinusoidal waveforms. The result is an accurate current measurement for many types of electrical equipment.

    $35

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    T-MAG-0400-05 Sensor

    The small size 5 AMP split-core AC Current Transformer (CT) is mounted around a current carrying wire to measure AC amperage. This CT provides a .333 Volt AC output proportional to current flow and is used with Onset data loggers via the FlexSmart TRMS module and with kWh transducers (WattNodes) for True RMS measurement of sinusoidal and non-sinusoidal waveforms. The result is an accurate current measurement for many types of electrical equipment.


    $35


  • The Magnelab AC Current 600 Amp AC Current Transformer or CT (Magnelab part # SCT-2000-600) is mounted around a current carrying wire to measure AC Amperage. This CT provides 333mV output proportional to current and is used with the FlexSmart TRMS Module for True RMS measurement of sinusoidal and non-sinusoidal waveforms. The result is accurate current measurement for many types of equipment, including variable frequency drives and switched power sources. One or two CTs can be used with each FlexSmart TRMS Module.

    $65

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    T-MAG-SCT-600 Sensor

    The Magnelab AC Current 600 Amp AC Current Transformer or CT (Magnelab part # SCT-2000-600) is mounted around a current carrying wire to measure AC Amperage. This CT provides 333mV output proportional to current and is used with the FlexSmart TRMS Module for True RMS measurement of sinusoidal and non-sinusoidal waveforms. The result is accurate current measurement for many types of equipment, including variable frequency drives and switched power sources. One or two CTs can be used with each FlexSmart TRMS Module.


    $65


  • Split-Core 200A DC Transducer sensor that measures up to 200 Amps of DC current.

    Note: The CT requires 12-30VDC @ 35mA excitation power for 0-5volts output option, which can be supplied by the FlexSmart Analog Module (Onset Part No. S-FS-CVIA) with H22; by the Analog Sensor Port with U30; and by power adapter and input cable (Onset Part No. AC-SENS-1 and CABLE-ADAP5) and with ZW or U12. For the 4-20mA option 15-30VDC @ 35mA will need to be provided.

    $205

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    T-VER-H970-200 Sensor

    Split-Core 200A DC Transducer sensor that measures up to 200 Amps of DC current.

    Note: The CT requires 12-30VDC @ 35mA excitation power for 0-5volts output option, which can be supplied by the FlexSmart Analog Module (Onset Part No. S-FS-CVIA) with H22; by the Analog Sensor Port with U30; and by power adapter and input cable (Onset Part No. AC-SENS-1 and CABLE-ADAP5) and with ZW or U12. For the 4-20mA option 15-30VDC @ 35mA will need to be provided.


    $205


  • Split-Core Bi-Polar DC Transducer sensor that measures up to 200 Amps of DC current in both flow directions.

    Requires analog port selection during U30 system configuration and use of a S-FS-CVIA when using the H22-001 data logger. When using a U12 data logger, this sensor requires a 4-20mA input cable (CABLE-4-20mA) and external power provided by an AC adapter (AC-SENS-1).

    Note: For measurements larger than 120A the device must be powered by a minimum of 15V to maintain expected accuracy.

    $229

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    T-VER-971BP-200 Sensor

    Split-Core Bi-Polar DC Transducer sensor that measures up to 200 Amps of DC current in both flow directions.

    Requires analog port selection during U30 system configuration and use of a S-FS-CVIA when using the H22-001 data logger. When using a U12 data logger, this sensor requires a 4-20mA input cable (CABLE-4-20mA) and external power provided by an AC adapter (AC-SENS-1).

    Note: For measurements larger than 120A the device must be powered by a minimum of 15V to maintain expected accuracy.


    $229


  • A split-core AC current sensor responsive over the range of 60 to 600 amps AC for use with U12, UX120, and ZW data loggers with external input channels. With an input current of AC current, sine wave, single phase 50 Hz or 60 Hz, load power factor 0.5 to 1.0 lead or lag.

    The molded-plastic housing is rated for indoor use per UL508, with removable leg.

    $115

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    CTV-E Sensor

    A split-core AC current sensor responsive over the range of 60 to 600 amps AC for use with U12, UX120, and ZW data loggers with external input channels. With an input current of AC current, sine wave, single phase 50 Hz or 60 Hz, load power factor 0.5 to 1.0 lead or lag.

    The molded-plastic housing is rated for indoor use per UL508, with removable leg.


    $115


  • A split-core AC current sensor responsive over the range of 20 to 200 amps AC for use with U12, UX120, and ZW data loggers with external input channels. With an input current of AC current, sine wave, single phase 50 Hz or 60 Hz, load power factor 0.5 to 1.0 lead or lag.

    The molded-plastic housing is rated for indoor use per UL508, with removable leg.

    $115

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    CTV-D Sensor

    A split-core AC current sensor responsive over the range of 20 to 200 amps AC for use with U12, UX120, and ZW data loggers with external input channels. With an input current of AC current, sine wave, single phase 50 Hz or 60 Hz, load power factor 0.5 to 1.0 lead or lag.

    The molded-plastic housing is rated for indoor use per UL508, with removable leg.


    $115


  • A split-core AC current sensor responsive over the range of 5 to 50 amps AC for use with U12, UX120, and ZW data loggers with external input channels. With an input current of AC current, sine wave, single phase 50 Hz or 60 Hz, load power factor 0.5 to 1.0 lead or lag.

    The molded-plastic housing is rated for indoor use per UL508.

    $90

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    CTV-B Sensor

    A split-core AC current sensor responsive over the range of 5 to 50 amps AC for use with U12, UX120, and ZW data loggers with external input channels. With an input current of AC current, sine wave, single phase 50 Hz or 60 Hz, load power factor 0.5 to 1.0 lead or lag.

    The molded-plastic housing is rated for indoor use per UL508.


    $90


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