Voltage, Current & Loop Calibrators

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Fluke 715 Volt/mA Calibrator

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£1,668.00 £1,390.00
- 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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Fluke 715

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Time Electronics DC Current Calibrator with Null Measuring

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£1,698.00 £1,415.00
- Can be used in numerous situations
- Compatible with different types of plugs
- Incredible accuracy of 0.02%
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1024

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Time Electronics DC Multifunction V/I/R Calibrator

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£1,794.00 £1,495.00
- Tilt stand can be adjusted to suit you
- Powered by rechargeable battery or mains plug
- Five ranges of DC voltage
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1017

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2 In Stock

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Fluke 709 Precision HART Loop Calibrator

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£1,798.80 £1,499.00
- HART communication tool
- Small, portable and rugged device
- Versatile range of advanced features
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FLUKE709H

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Fluke 789 ProcessMeter™, IR3000FC Connector & A3004FC Clamp Meter Kit

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£2,034.00 £1,695.00
- Fluke 789 ProcessMeter™: a combined digital multimeter and mA loop calibrator
- Fluke IR3000FC Connector: facilitates a connection between the Fluke 789 and Fluke Connect™ App
- Fluke A3004FC Clamp Meter: current clamp capable of wirelessly transferring measurements
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4722828

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Fluke 710 mA Loop Valve Tester with HART

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£2,946.00 £2,455.00
- Optimised for testing complex smart valves
- Integrated signature, step, speed and bump testing procedures
- Includes a HART modem for communicating HART commands
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4991049

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Ametek Jofra mAcal Loop Calibrator

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- Source and measure current up to 24mA to an accuracy of ±0.05%
- Measure DC voltage between 0 and 45V DC to ±0.5V DC
- View readings in milliamps (up to 0.01mA), per cent, voltage, and seconds
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01642 931329

AME-MACAL

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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 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.