Voltage, Current & Loop Calibrators (37 Products)

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  1. Fluke 707Ex Intrinsically Safe Loop Calibrator - Kit All Fluke Products
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    Fluke 707Ex Intrinsically Safe Loop Calibrator
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    • Intrinsically safe for use in dangerous environments
    • Large, easy-to-read display,  quick-click and push rotary buttons for ease of use
    • Certified in accordance with ATEX directive
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    SKU: FLUKE707EX
  2. Time Electronics Dc Current Source With Null Meter 0 02 Percent Accuracy 1 All Time Electronics Products
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    Time Electronics 1021 DC Current Source
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    • 2.4 watts max output power
    • Three separate output ranges
    • Useful for lots of different applications
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  3. Time Electronics Dc Millivolt Potentiometer And Calibrator 0 02 Percent Accuracy 1 All Time Electronics Products
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    Time Electronics 1007 DC Millivolt Potentiometer & Calibrator
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    • 3 ranges: 0 to 1V, 0 to 100mV and 0 to 10mV
    • High accuracy
    • Microvolt null balance display
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  4. GE Druck UPS-III-IS Intrinsically Safe Loop Calibrator - Kit All GE Druck Products
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    GE Druck UPS-III-IS Intrinsically Safe Loop Calibrator
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    • Intrinsically safe for use in hazardous environments
    • Measure and source 0 to 24mA
    • Built-in HART resistor
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  5. GE Druck DPI812 RTD Loop Calibrator All GE Druck Products
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    GE Druck DPI812 RTD Loop Calibrator
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    • Compact, handheld, field-optimised instrument
    • Measure and source RTDs
    • mA measurements with 24V loop power
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    SKU: DPI812
  6. Fluke 715 Volt/mA Calibrator - Kit All Fluke Products
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    Fluke 715 Volt/mA Calibrator
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    • Calibrate volt and mA sources with the greatest of ease
    • Works with Fluke 80 series digital multimeters
    • Robust, lightweight and easy-to-use
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    SKU: Fluke 715
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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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