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FAQ: Transducers

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Transducers

Principle

QuestionAnswer
On the test data sheet for LMA-A, the rated output states 1.025mV/V. What is the equivalence in microstrain?Equivalent strain for 1mV/V=2000×10-6 strain.
Therefore, the equivalent strain is 1.025mV/V=2050×10-6 strain.
Explain the frequency response of a load transducer (load cell)In general, the frequency response is about 1/10 of the natural frequency.
What is RO?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.

e.g. For a load cell with rated load of 5kN, it is the output value when 5kN of load is applied, after taking zero balance without load.　
±1%RO means 1% of 5kN (because RO=5kN).
What’s TEDS?TEDS is an acronym for Transducer Electronic Data Sheet. It’s the computerized sensor information stored in a sensor.
When the sensor is connected to a TEDS compatible measuring instrument, the instrument reads the sensor information for automatic setting of optimum measurement conditions.
What is the amount of displacement when a load of the rated capacity is applied to the load cell?The transducer load point displacement differs depending on the product, usually several tens of micrometers. For example, the displacement is 0.04 mm for the LMC-A-10KN load cell when a rated load of 10 kN is applied.
What’s the difference between the tension and compression sensitivities of a tension and compression load cell?It depends on the product. It’s within 1% of the rated output for LUX-B. The details are provided in the product Test Data Sheet.
Which output is the positive side in a tension and compression load cell?The output of a tension and compression load cell is positive for tension and negative for compression.
The output of a tension load cell is positive for tension.
The output of a compression load cell is positive for compression.
Tell me about the advantages and disadvantages of the flush diaphragm type and inlet pipe type pressure gages.(1) Flush diaphragm type
Advantages: Excellent response. Possible for measurement of highly viscous liquids.
Disadvantages: Since the pressure receiver is exposed at the tip, you must be careful not to knock and damage it when attaching the gage.

(2) Inlet pipe type
Advantages: A wide range of product line can be provided from low capacity to high capacity. Since the pressure receiver is inside the main unit, it’s unlikely to be damaged by knocking.
Disadvantages: Poor response. If viscous liquid enters the inlet pipe, it is not completely replaced and accumulates inside instead. Any entered air is difficult to remove completely.
The specifications list of the acceleration transducer provides the response frequency range. Many acceleration transducers have a sensitivity deviation of ±5%. Tell me about the definition of the sensitivity deviation for the response frequency range.The sensitivity deviation is the error in the rated output when the rated load is applied.

How to use

QuestionAnswer
About the loading calibration process of the Instrumentation Conditioner Card.When performing load calibration with a instrumentation conditioner (WGA) and load cell, use at least half of the rated capacity to avoid deviance.

e.g. LCN-A-5KN: When load calibrated with 100 N, it will display different output than when load calibrated using 2.5 kN.
About the usage of torque transducer in both rotational direction (forward and reverse).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).
ASPC-A uses only one cable for the X, Y, and Z output. How does the measuring instrument receive the data?Although ASPC-A uses only one output cable, but it terminated with 3 BNC connetors for 3 output signals.
The measuring instrument must have three BNC-input channels. EDX-200A and EDX-5000A require the CCA-40A (-F) card. The input on the side of the measuring instrument is an integrated connector with BNC connectors.
Does the absolute pressure transducer require a zero balance taken in a vacuum state?To measure the absolute pressure, the measured data must be compensated for the atmospheric pressure.
Use a measuring instrument capable of setting the initial unbalance or that supports data processing to compensate for the difference. See the instruction manual for more information.
Alternatively, remove the sensor load pressure using a vacuum pump and take the balance before measurement.

Others

QuestionAnswer
Do you offer repair and calibration services for your products?We offer a wide range of services. Please contact our sales staff for more information.
Can you reissue the Test Data Sheet?
Check the product serial number and contact our sales staff.
Tell me about the types and contents of the calibration documents of your product.We provide the calibration data. We can also provide the calibration certificate and the traceability document for a fee.
I’ve lost the Test Data Sheet. What can I do?Check the product serial number and contact our sales staff.

Product Selection

QuestionAnswer
Can the pressure transducers measure negative pressures?The PAB and PHS absolute pressure transducers can measure negative pressures. Although other pressure transducers measure the pressure difference relative to atmospheric pressure, some products provide negative pressure calibration. Please contact our sales staff.