Voltage, Current & Loop Calibrators (37 Products)

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  1. Sika EC mAV Pocket Loop Calibrator All Sika Products
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    Sika EC mAV 2 Pocket Loop Calibrator
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    • Voltage and current loop signal measurement/generation
    • Pocket-sized design for ease of use
    • High accuracy
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    SKU: EC MAV.2
  2. 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
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    SKU: 1030
  3. PRC15 Current and Voltage Calibrator - Kit 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
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    SKU: PRC15
  4. 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
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    SKU: Fluke 771
  5. TestSafe RTD Calibrator All Test Safe Products
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    TestSafe RTD Calibrator
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    • Simulate and measure RTD
    • Resistance calculation
    • Various advanced features
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    SKU: TSCALIB2
  6. Time Electronics Dc Voltage And Current Calibrator 0 05 Percent Accuracy All Time Electronics Products
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    Time Electronics DC Voltage and Current Calibrator
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    • High accuracy of 0.05%
    • Can measure and source current and voltage
    • Portable with its own carrying case
    892 Reward Points
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    SKU: 1044
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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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