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
     
    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. GE Druck UPS-III Loop Calibrator All GE Druck Products
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    GE Druck UPS-III Loop Calibrator
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    • Simultaneous percentage and mA readings
    • Extremely high accuracy
    • Portable, pocket-sized design
    1,224 Reward Points
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    SKU: UPS-III
  3. 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
    1,780 Reward Points
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    SKU: UPS-III-IS
  4. 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
    1,838 Reward Points
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    SKU: DPI812
  5. GE Druck DPI 832 Electrical Loop Calibrator All GE Druck Products
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    GE Druck DPI 832 Electrical Loop Calibrator
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    • Measure and source mA, mV and V
    • Portable, handheld design for use in the field
    • Also can be used as a pressure calibrator when combined with optional IDOS sensors
    2,092 Reward Points
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    SKU: DPI832
  6. GE Druck DPI 842 Frequency/Loop Calibrator All GE Druck Products
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    GE Druck DPI 842 Frequency/Loop Calibrator
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    • Measure and source frequency in sine, triangular and square waveforms
    • Handheld, portable design for use wherever you need it
    • mA measurement mode
    2,470 Reward Points
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    SKU: DPI842
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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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