Transducers

We introduce here answers to frequently asked questions.

All display

Q1On 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 strain.
Therefore, the equivalent strain is 1.025mV/V=2050×10-6 strain.

Q2Could you please explain about the wiring of sensor?

A2

Typical 4-conductor cable wiring is as follows.

Wire Color Connector Description
Red A Input (+) {+ Excitation Voltage (applied voltage bridge)}
White B Output (-) {-Signal (output signal)}
Black C Input (-) {-Excitation Voltage (applied voltage bridge)
Green D Output (+) {+ Signal (output signal)}
Shield E Shield

Q3What 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 flow through. This heat may effect the measurement)

Q4Explain the frequency response of a load transducer (load cell)

A4

In general, the frequency response is about 1/10 of the natural frequency.

Q5What 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.

Q6What are the signs of the load cell output?

A6

  1. Compression Load Cell: The compressive load output is in the positive sign (+).
  2. Tension Load Cell: The tensile load output in the positive sign (+).
  3. Compression/Tension Load Cell: The tensile load output is in the positive sign (+), and the compressive load output is in the negative sign (-).

Q7How do you reverse the output sign?

A7

If you reverse the conductor wires (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 perform the zero balance after reversing the wires.

Some transducers use the NDIS connector provided by TAJIMI ELECTRONICS CO., LTD.

Q8About the loading calibration process of the Instrumentation Conditioner Card.

A8

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.

Q9About 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).

Q10What 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.

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).

Q11What’s "TEDS?"

A11

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.

Q12Tell me about the transducer load point displacement caused when the rated load is applied.

A12

The transducer load point displacement differs depending on the product. For example, the displacement is 0.04 mm for the LMC-A-10KN load cell when a rated load of 10 kN is applied.

Q13What’s the difference between the tension and compression sensitivities of a tension and compression load cell?

A13

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.

Q14Which output is the positive side in a tension and compression load cell?

A14

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.

Q15Do you offer repair and calibration services for your products?

A15

We offer a wide range of services. Please contact our sales staff for more information.
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Q16Can you reissue the Test Data Sheet?

A16

Check the product serial number and contact our sales staff.
Please contact us here .

Q17Tell me about the types and contents of the calibration documents of your product.

A17

We provide the calibration data. We can also provide the calibration certificate and the traceability document for a fee.

Q18I’ve lost the Test Data Sheet. What can I do?

A18

Check the product serial number and contact our sales staff.
Please contact us here.

Q19ASPC-A uses only one cable for the X, Y, and Z output. How does the measuring instrument receive the data?

A19

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-100A, 200A, 2000B, and 3000B require the CCA-40A (-F) card. The input on the side of the measuring instrument is an integrated connector with BNC connectors.

Q20Tell me about the advantages and disadvantages of the flush diaphragm type and inlet pipe type pressure gages.

A20

(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.

Q21Can the pressure transducers measure negative pressures?

A21

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.
Please contact us here.

Q22Does the absolute pressure transducer require a zero balance taken in a vacuum state?

A22

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.

Q23The "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.

A23

The sensitivity deviation is the error in the rated output when the rated load is applied.