Voltage, Current & Loop Calibrators (38 Products)
Free UK Delivery*Time Electronics 1077 Milliamp Transducer Simulator£1,230.00 £1,025.00
2050 Reward PointsPrice Match GuaranteeSKU: 1077
- Easy operation and LCD screen for measurement referencing
- Three modes to choose from
- Comes with free rubber protective case for fieldwork and travelling
Free UK Delivery*Time Electronics DC Current Calibrator with Null Measuring£1,584.00 £1,320.00
2640 Reward PointsPrice Match GuaranteeSKU: 1024
- Can be used in numerous situations
- Compatible with different types of plugs
- Incredible accuracy of 0.02%
Free UK Delivery*Time Electronics DC Multifunction V/I/R Calibrator£1,722.00 £1,435.00
2870 Reward PointsPrice Match GuaranteeSKU: 1017
- Tilt stand can be adjusted to suit you
- Powered by rechargeable battery or mains plug
- Five ranges of DC voltage
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.