Voltage, Current & Loop Calibrators (37 Products)

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  1. Druck 191-129 Mains Adaptor for UPS-III Loop Calibrator All GE Druck Products
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    GE Druck 191-129 Mains Adaptor for UPS-III Loop Calibrator
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    • Universal mains input adaptor
    • For UPS-III loop calibrator
    • Ideal for when batteries run out
    170 Reward Points
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    SKU: 191-129
  2. Extech 412355A Current and Voltage Calibrator Meter - Kit All Extech Products
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    Extech 412355A Current and Voltage Calibrator/Meter
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    • Oyster case with flip-up display is ideal for handheld or benchtop applications
    • Display readings in mA or as a % of the 0 to 24mA range or as mV in voltage ranges
    • Provides adjustable 0 to 24mA and 0 to 10V calibration source
    336 Reward Points
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    SKU: 412355A
  3. Extech 412300A Current Calibrator Meter All Extech Products
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    Extech 412300A Current Calibrator/Meter
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    • Oyster case with flip-up display is ideal for handheld or benchtop applications
    • Display readings in mA or as a % of the 0 to 24mA range or as mV in voltage ranges
    • Provides 0 to 24mA output displayed as mA or %
    392 Reward Points
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    SKU: 412300A
  4. Time Electronics Loop Simulator And Source Loop Mate 1 0 1 Percent Accuracy All Time Electronics Products
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    Time Electronics 7006 Loop Simulator and Source
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    £264.00 £220.00
    • 7 set calibration points
    • 0.1% accuracy
    • 0 to 10 V or 4 to 20mA loop
    440 Reward Points
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    SKU: 7006
  5. Martindale TEK300 20mA Loop Calibrator All Martindale Products
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    Martindale TEK300 20mA Loop Calibrator
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    • Three built in modes
    • Overload protection
    • Range of 0 to 20mA
    458 Reward Points
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    SKU: MARTEK300
  6. PRC10 Current Calibrator All Extech Products
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    Extech PRC10 Current Calibrator
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    • Small size calibrator
    • 0 to 24mA
    • 24V DC power source
    546 Reward Points
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    SKU: PRC10
  7. Sika EC mAV Pocket Loop Calibrator All Sika Products
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    Sika EC mAV 2 Pocket Loop Calibrator
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    £370.80 £309.00
    • Voltage and current loop signal measurement/generation
    • Pocket-sized design for ease of use
    • High accuracy
    618 Reward Points
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    SKU: EC MAV.2
  8. Time Electronics Combined Voltage Current Source Microcal 0 1 Percent Accuracy All Time Electronics Products
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    Time Electronics 1030 MicroCal Voltage & Current Source
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    • Simulate various signal types
    • Multiple outputs
    • High accuracy
    628 Reward Points
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    SKU: 1030
  9. PRC15 Current and Voltage Calibrator All Extech Products
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    Extech PRC15 Current and Voltage Calibrator
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    • 0 to 24mA (-25% to 125%)
    • 0 to 20V DC calibration source
    • Measure DC process signals
    634 Reward Points
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    SKU: PRC15
  10. Fluke 771 Milliamp Process Clamp Meter All Fluke Products
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    Fluke 771 Milliamp Process Clamp Meter
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    • Long battery life (40 hours)
    • 0.01 mA resolution
    • backlit dual display
    790 Reward Points
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    SKU: Fluke 771
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About Voltage, Current & Loop Calibrators

Also known as current loops, 4-20mA sources are one of the most common methods used in the process industry for transmitting data between sensors and the applications that control and monitor them. The main advantage of a current loop is they can be combined with a huge variety of different sensors to measure temperature, pressure, liquid flow or light. This data is then compatible with a wide range of different management applications that interoperate with the data and react accordingly.

4-20mA current loops work by taking the results from the sensor and converting it to a proportional current. This means that a zero result causes a 4mA to be transmitted and a 20mA current is sent when the sensor is at full capacity. This information is then sent through copper cables to a receiver at the controller. The controller then decodes the sent signal into the format that is required by the process monitoring application.

The drawback with this method is that over long distances the signal can eventually erode as the voltage begins to wane. An engineer must also be careful when laying these cables to ensure that no electrically noisy systems are located close by, otherwise they can affect the signal. The main precaution that can be taken is to ensure the use of shielded cabling but this can become too expensive if used over long distances.

To ensure that a current loop is operating effectively engineers often use current calibrators to test the cables and ensure that there are no issues that need resolving no matter what their source.

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