4-20mA Current loop
DIVIZE offers a complete range of 4-20mA current loop testers. The testers are used with various tasks in industrial, maritime, building and agricultural automation.
- Precision current loop tester panel mounting
4-20mA current loop simulator designed for simulation of 4-20mA signals on analog inputs for PLC and DCS systems. The A2007E is equipped with a precision multi-turn potentiometer for accurate and precise current adjustment. With this potentiometer the input signal is simulated in order to test software for PLC and DCS systems. The A2007E 4-20mA simulator is suitable for 2-wire and 4-wire 4-20mA systems.
A2007E Precision current loop tester panel mounting details
- Current loop tester panel mounting
4-20mA current loop simulator designed for simulation of 4-20mA signals on analog inputs for PLC and DCS systems. The A2007C is equipped with a single turn potentiometer for fast and stable current adjustment. With this potentiometer, the input signal is simulated to test software for PLC and DCS systems. The A2007C 4-20mA simulator is suitable for 2-wire and 4-wire 4-20mA systems.
A2007C Current loop tester panel mounting details
- Precision current loop tester, panel mount 1,6-26mA range
4-20mA current loop simulator designed for simulation of 4-20mA signals on analog inputs for PLC and DCS systems. The A2007E-SP is equipped with a precision multi-turn potentiometer for accurate and precise current adjustment. With this potentiometer the input signal is simulated in order to test software for PLC and DCS systems. For testing fault signals as a result of over or undercurrent the A2007E-SP is capable of controlling the current from 1,6-26 mA the A2007E-SP simulator is suitable for 2-wire and 4-wire 4-20mA systems.
A2007E-SP Precision current loop tester, panel mount 1,6-26mA range details
- PWM controlled 4-20 mA simulator
A2127-X€28.21PWM controlled 4-20 mA simulator. The A2127 is designed to connect to a Raspberry PI, Arduino, Beaglebone black etc. The PWM signal from this micro-controller is converted by the A2127 to a 4-20 mA current. With help of the A2127 a programmable 4-20 mA current simulator is realized. The software in the micro-controller can set the current in the 4-20 mA loop. The A2127 is a passive device. Therefore it can be used in both passive and active 4-20 mA current loop setup. Typical applications include PLC analog input simulation, control of 4-20 mA devices such as positioners, I/P converters displays and so on. The A2127 4-20 mA simulator provides a galvanic isolation between the micro-controller and the 4-20 mA loop. This allows safe application in industrial environments,
A2127-X PWM controlled 4-20 mA simulator details
- 4-20mA current loop tester, Namur NE43 panelmount
4-20mA current loop tester with a 10-turn potentiometer suitable for panel mounting with a current range according the Namur NE43 recommendation.
The A2007E-X is designed for testing analog inputs on PLC and DCS systems according the Namur NE43 recommendation.
Software used in automation systems in the process industry need to be tested before commissioning. Signals from field equipment are not available during this software test. The A2007E-X is designed to solve this problem, the A2007E-X can simulate the signals from transmitters such as pressure, temperature, position etc. This allows the software to be tested. The current range according Namur NE 43 also allows testing of transmitter failures.
A2007E-X 4-20mA current loop tester, Namur NE43 panelmount details
Usage examples of the 4-20 mA current loop tester.
Testing of software for PCS systems (PLC/DCS) Before commissioning of industrial automation systems software has to be verified. Alarm set-points are checked, simulator range settings are verified etc. etc. For this purpose the 4-20 mA signals from pressure, temperature and other transmitters have to be simulated. The Divize current loop tester allows manual setting of the 4-20 mA current representing the measurement value from the transmitter. So the PLC software can be verified for correct response to the measured value. This can be done in the office allowing faster on site commissioning saving time and resources.
Manual adjustment of set points
For industrial machines in many applications a manual adjustment or control is necessary. The 4-20 mA input on many PID controllers, VFD drives and PLC units is used for this purpose. The Divize 4-20 mA generator is used to control the 4-20 mA input Thus allowing manual adjustment of set-points. The stable, and temperature independent control of the current allows easy control of the set-points.
Dry testing of machines.
Before delivery many machines are dry-tested. For this purpose a special test set-up is created simulating all kind of running signals so the proper functioning of the machine is ensured. In this kind of set-up the Divize 4-20 mA generators are often used to simulate analogue measurement signals.
FAT/SAT testing of PCS systems
During FAT/SAT testing of PCS systems the 4-20 mA generator is connected to each analogue input of the PCS system, according testing protocols several control schemes are simulated to verify correct actions from the PCS system. The control schemes can be complicated, the low cost 4-20 mA testers are designed for this purpose.
During loop checking, the complete measurement loop of a single instrument is verified. For this purpose the instrument is disconnected and replaced with a 4-20 mA generator used to simulate the 4-20 mA signal from the instrument. With this 4-20 mA generator the full range of the signal is simulated allowing effective and combined verification of all components that are part of the loop.
4-20 mA current loop tester features
The Divize 4-20 mA testers are designed to test and commission 4-20 mA current loop systems. With a potentiometer the 4-20 mA current in the loop is set manually allowing verification of the loop and the equipment attached. The 4-20 mA current is set independent of the voltage applied to the loop, the 4-20 mA simulators are suitable for a maximum voltage of 32V DC as required by ISA 50.1 standard. Because the loop current is set with a potentiometer the current loop testers are also known as 4-20 mA potentiometer.
The 4-20mA current loop generators are passive, suitable for 2 wire connection. When a 24 Volt DC power supply is connected, the 4-20mA simulator can also be used for 4-wire connection testing aka 4-20 mA generator.
The 4-20mA current loop simulators are protected for wrong connections, also the current is limited so there is no risk of damage to the equipment that needs to be tested
The Divize 4-20 mA current loop testers are available with different current range, suitable for normal 4-20 mA operation but also Namur NE43 range and extended range. Various potentiometers are available standard 300 degr potentiometer for fast setting of the current, and 10 turn precision potentiometers for very accurate setting of the 4-20 mA current. Panel mount types are available, and boxed hand-held units.
The Divize 4-20 mA generators are tested and comply with FCC rules, and CE.
More information about 4-20 mA current loop tester usage
- Online calculator to calculate the voltage drop in current loop circuits
- Online calculator to calculate voltage drop in a Current Loop system.
- Conversion from physical value to 4-20 mA scaling calculator
- Online scaling calculator to convert physical values to 4-20 mA loop current.
- How to configure a 4-20 mA analog input on a PLC.
- Article with a step by step approach on hooking up and configuring 4-20 mA analog inputs to a PLC/DCS or simular industrial automation system.