The weighing module serves the purpose of measuring and processing signals from weight, torque, or force sensors. The weighing module enables the direct connection of a load cell in the strain gauge full bridge circuit (voltage-fed bridge circuit).
The feed voltage of the bridge is generated from the back wall bus of the TB20 and amounts to 5 V with a maximum 70 mA load. The voltage output is protected with an internal, reversible fuse against overload and short circuit. Weighing cells with a maximum of 72 Ω can be connected. The external bridge feed of the load cell is possible.
The bridge voltage can be measured on the load cell with 6-wire connection. The measured value is incorporated into the calculation of the measurement value. Controlled by the application, wire break detection can also take place by feeding test current into the measurement channel.
The input channels have a resolution of 24 bits. Measurement values are issued configurable in mV/V or in kg.
With adjustable sample rates, interference voltages and mechanical fluctuations in the measurement can be suppressed. Disruptions from a series of measurement values can be smoothed out using a moving mathematical average. A zero point comparison of the load cell can be carried out with the offset, or measurement with a definite value can be commenced with. Linearity deviations of the measuring instruments can be linearized with up to 5 sampling points.
The measurement inputs have overvoltage protection relating to the 24 V potential and possess electrical isolation with 500 V dielectric strength.
|Article name||Strain gauge weighing module|
|Scope of delivery||Strain gauge weighing module|
|Dimensions (DxWxH)||110 x 14 x 73 mm|
|Weight||Approx. 70 g|
|Measuring ranges||4 mV/V, 2 mV/V|
|Measurement error||0.1 %|
|With reference to the measuring range end value||for conversion rates with 50 Hz suppression|
|Load cell terminal||6-Conductor technology, 4-conductor technology with two bridges|
|Average filter||Arithmetical average with nmax=255|
|Issuing of measurement value||mV/V or kg configurable|
|Characteristic linearization||Max. 5 sampling points|
|Access protection of the works parameters/data||no|
|Testing of line break||Feeding of test current into the measurement channel|
|Internal bridge feed||5 V 70 mA Ri ca. 6.5 Ohm internal, reversible fuse|
|Diagnoses||Error response via status bits|
|Power supply for modules||DC 5V, max. 130 mA, Voltage supply via back wall bus, irrespective of voltage to be measured|
|Isolation voltage||500 V|
|Power dissipation||Max. 0.7 W|
|Ambient temperature||0 °C … +60 °C|
|Transport and storage temperature||-20 °C … +80 °C|
|Relative air humidity||95 % r H without condensation|
|Protection rating||IP 20|
|Surrounding Air Temperature||0 °C … +60°C|
|Noise immunity||DIN EN 61000-6-2 “EMC Immunity”|
|Interference emission||DIN EN 61000-6-4 “EMC Emission”|
|Vibration and shock resistance||DIN EN 60068-2-8:2008 “Vibration”, DIN EN 60068-27:2010 “Shock“|
|TB20, Manual Strain gauge weighing module||1||5 MB|