Voltage, Current & Loop Calibrators
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Free UK DeliveryFluke 787B Process Meter™£1,266.00 £1,055.00
- Two in one digital multimeter and mA loop calibrator
- Compact design
- Multitude of measurement functions and ability to measure, source and simulate up to 20mA DC
1055 Reward PointsPrice Match GuaranteeFLUKE 787B -
Free UK DeliveryFluke 773 Milliamp Process Clamp Meter£1,374.00 £1,145.00
- Measures mA signals without breaking the loop
- Best in class with 0.2% accuracy
- Dual backlit display with mA measurement and percent of 4 - 20 mA span
1145 Reward PointsPrice Match GuaranteeFLUKE773 -
Free UK DeliveryFluke 789/E ProcessMeter£1,558.80 £1,299.00
- Loop calibrator and DMM in one tool
- Built-in HART resistor
- Full suite of multimeter functions including voltage, current and continuity
1299 Reward PointsPrice Match GuaranteeFLUKE789 -
Free UK DeliveryFluke 715 Volt/mA Calibrator£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
1390 Reward PointsPrice Match GuaranteeFluke 715 -
Free UK DeliveryFluke 709 Precision HART Loop Calibrator£1,798.80 £1,499.00
- HART communication tool
- Small, portable and rugged device
- Versatile range of advanced features
1499 Reward PointsPrice Match GuaranteeFLUKE709H
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.