A20220 Sensor Transmitter | Input strain gauges and load cells | For safety circuits up to SIL3
Description
The transmitter for strain gauge full bridges in a 6 mm housing.
- Universal usability
for strain gauges, pressure and load cells, and other resistive measuring bridges - Intuitive configuration
of basic parameters – easy, without tools, using 4 rotary and 8 DIP switches - Calibrated range selection
without complicated trimming - Convenient adjustment
Zero point and sensitivity are directly adjusted “at the push of a button“ using the teach-in function - Protective separation
according to EN 61140 – protection of the maintenance staff and downstream devices against excessively high voltages up to 300 V AC/DC - High accuracy
with innovative switching concept - Minimum space requirement
in the enclosure – only 6 mm wide modular housing – more transmit-ters per meter of mounting rail - Low-cost assembly
quick mounting, convenient, connection of power supply via DIN rail bus connectors - 5-year warranty
The Task
In many different industrial applications strain gauges are used to continuously measure mechanical quantities such as force/weight or deflection/torsion. In many cases they are used as a reference input for monitoring systems, safety shutdown systems, or for similar critical tasks. As a rule, high demands are placed on function, accuracy, flexibility and electrical safety. Strain gauges are highly sensitive resistors which react to mechanical stress with a slight change in resistance. These changes can be detected by a bridge circuit. The most common circuit design is the full bridge. In force transducers and load cells, the strain gauges are already mechanically applied in full bridge circuits. These sensors provide a raw signal which is prepared and standardized for further processing using a strain gauge transmitter.
The Problem
Customary strain gauge sensors have individual characteristics, which requires tedious and timeconsuming adjustment of the respective strain gauge transmitter using potentiometers. Furthermore, strain gage transmitters up to now had a very wide modular housing and therefore occupied a large amount of space in the enclosure. For world-wide applications, several versions with different supply voltages were often used.
The Solution
The universal A20220 strain gauge transmitters provide connection possibilities for all standard strain gauge force transducers and strain gauge load cells in full bridge configuration. They can be flexibly adapted to the respective measuring task using DIP and rotary encoder switches or via a “teach-in function“. 3-port isolation with protective separation up to 300 V AC/DC according to EN 61140 ensures optimum protection of personnel and equipment as well as unaltered transmission of measuring signals. The A20220 offer maximum performance in the smallest of spaces. Adjusting the zero point and sensitivity to the individual strain gauge sensor is particularly convenient using the “teach-in func-tion“ – just at the push of a button at the device front. Sensors with known characteristics can be very easily calibrated using four rotary encoder switches and eight DIP switches. Special measuring tasks can be solved with SensoTrans devices which Knick configures according to individual specifications. Fixed-range devices without switch are used, for example, when manipulations or mix-ups must be precluded.
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| Input: | Strain Gauges / Load Cells |
|---|---|
| Output: | 0 … 10 V, 0 … 20 mA, 4 … 20 mA, ±10 V, ±20 mA |
| Working Voltage, Min.: | 50 V, 300 V |
| Fault Class: | 0.1 %, < 0.5 % |
| Housing: | 6 mm Modular housing |
| Power Supply: | 24 V DC |
| Approvals: | CSA, UL |
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