Voltage, Current & Loop Calibrators
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Free UK DeliveryExtech PRC15 Current and Voltage Calibrator£378.00 £315.00
- 0 to 24mA (-25% to 125%)
- 0 to 20V DC calibration source
- Measure DC process signals
315 Reward PointsPrice Match GuaranteePRC15 -
Free UK DeliveryTime Electronics 1030 MicroCal Voltage & Current Source£414.00 £345.00
- Simulate various signal types
- Multiple outputs
- High accuracy
345 Reward PointsPrice Match Guarantee1030 -
Free UK DeliverySika EC mAV 2 Pocket Loop Calibrator£462.00 £385.00
- Voltage and current loop signal measurement/generation
- Pocket-sized design for ease of use
- High accuracy
385 Reward PointsPrice Match GuaranteeEC MAV.2 -
Free UK DeliveryChauvin Arnoux CA 1631 Voltage & Current Process Signal Calibrator£658.80 £549.00
- Simulates and measures DC current loop and DC voltage
- DC current loop: 0 to 24mA
- DC voltage: 0 to 24V
549 Reward PointsPrice Match GuaranteeP01654402 -
Free UK DeliveryTime Electronics DC Voltage and Current Calibrator£678.00 £565.00
- High accuracy of 0.05%
- Can measure and source current and voltage
- Portable with its own carrying case
565 Reward PointsPrice Match Guarantee1044 -
Free UK DeliveryTime Electronics Voltage / Current / Loop Calibrator£696.00 £580.00
- Works with current and voltage levels
- Accuracy of 0.02%
- Suitable for being used by a number of professions
580 Reward PointsPrice Match Guarantee1048 -
Free UK DeliveryFluke 771 Milliamp Process Clamp Meter£702.00 £585.00
- Long battery life (40 hours)
- 0.01 mA resolution
- backlit dual display
585 Reward PointsPrice Match GuaranteeFluke 771
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 it 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.