About Transducers
- Q1.
- On the test data sheet for LMA-A, the rated output states 1.025mV/V. What is the equivalence in microstrain?
- Q2.
- Could you please explain about the wiring of sensor?
- Q3.
- What is the appropriate excitation voltage?
- Q4.
- Explain the frequency response of a load cell.
- Q5.
- What is the displacement of the load cell when rate capacity is applied?
- Q6.
- what about the sign of the load cell output?
- Q7.
- How do you reverse the output sign?
- Q8.
- About the loading calibration process of the Instrumentation Conditioner Card.
- Q9.
- About the usage of torque transducer in both rotational direction (forward and reverse).
- Q10.
- What is RO?
- Q1.
- On the test data sheet for LMA-A, the rated output states 1.025mV/V. What is the equivalence in microstrain?
- A1.
-
Equivalent strain for 1mV / V = 2000 × 10 -6
Therefore, the equivalent strain 1.025mV / V = 2050 × 10 -6 is (με). - Q2.
- Could you please explain about the wiring of sensor?
- A2.
-
Typical four- core cable wiring is as follows.
Heart line Color Connector Meaning Red A Input (+) {+ EXT (applied voltage bridge)} White B Output (-) {-SIG (output signal)} Black C Input (-) {-EXC (applied voltage bridge) Green D Output (+) {+ SIG (output signal)} Shield E Shield - Q3.
- What is the appropriate excitation voltage?
- A3.
-
Set the excitation voltage of the instrument with in the recommended voltage of the sensor. Exceeding the recommended voltage will result in unstable measurement and may cause drifting.Worst case, it may damage the sensor. (The strain gage used in these sensors are resistor type gages and produces heat when electrical current passes through. This heat may effect the measurement)
- Q4.
- Explain the frequency response of a load cell.
- A4.
-
In general, the frequency response is about 1/10 of the natural frequency.
- Q5.
- What is the displacement of the load cell when rate capacity is applied?
- A5.
-
It depends on the model, but it is roughly several tens of μm.
- Q6.
- what about the sign of the load cell output?
- A6.
-
1. Compression Load Cell: The compressive load output is in the (+) sign.
2. Tension Load Cell: The tensile load output in the (;) sign.
3. Compression/Tension Load Cell: The tensile load output is in the (+) sign, and the compressive load output is in the (-) sign.
- Q7.
- How do you reverse the output sign?
- A7.
-
If you reverse the core wire (green and white) of the cable terminal then the positive and negative of the signal output will be reversed. For the connector, reverse the line that connects to D and B. Make sure to take the zero balance after reversing the wires.
- Q8.
- About the loading calibration process of the Instrumentation Conditioner Card.
- A8.
-
When performing load calibration with Instrumentation Conditioner (WGA) and load cell, use at least half of the rated capacity to avoid deviance.
Example LCN-A-5KN: When load calibrated with 100N, it will display different output than when load calibrated using 2.5kN. - Q9.
- About the usage of torque transducer in both rotational direction (forward and reverse).
- A9.
-
TPH-A and TPS-A are calibrated in both forward and reverse direction. All other torque sensors are only calibrated in one direction. The reason is because the brush has a favorable direction, and the noise/mechanical hysteresis from the rotation causes difference in sensitivity between forward and reverse rotation.
(TP-E model have about 1 to 5% difference).
- Q10.
- What is RO?
- A10.
-
Stands for "RATED OUTPUT", refers to the value obtained by subtracting the zero load output from the output of rated load. Usually, the equivalent strain is expressed in mV / V, or mA. It is the output value when the rated load is applied after taking zero balance with zero load.
Example For a load cell with rated load of 5kN, it is the output value when 5kN of load is applied, after taking zero balance with zero load. ±1%RO means 1% of 5kN (because RO=5kN).
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