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Transmitter

A transmitter is a signal conditioning instrument that amplifies the minute voltage signals (in mV/V) output by strain gauge load cells, pressure gauges, torque transducers and similar sensors, and converts them into analog voltage or current signals, or digital signals, for transmission to control equipment or recorders. It generally supplies bridge excitation to the sensor and provides zero adjustment and calibration functions. Available forms include a standalone type housed in a case, a printed circuit board type for integration into equipment, and a multi-channel type. Dedicated models for torque transducers using optical transmission or rotary transformer methods are available, as are models with high-speed digital output such as RS-422. They are used for load, pressure and torque measurement, tie bar measurement on molding machines, and equipment operation monitoring.

How to choose Transmitter

  1. 1. Select an input range that matches the sensor output

    The rated output (mV/V) of the connected sensor must fall within the input range of the transmitter. Listed products offer a wide input range of 0.3 to 500 mV/V. For sensors with a small rated output, selecting a model with a lower input range limit makes it easier to secure resolution.

  2. 2. Output format suited to the receiving side

    Check whether the output is voltage (such as ±10 V) or current (such as 4 to 20 mA) against the input specifications of the PLC or recorder. In environments with long cable runs and high noise, current output is advantageous. For digital output models, also confirm the baud rate (921.6 kbps in the listed example) and the number of units that can be connected in parallel.

  3. 3. Match bridge excitation voltage to the sensor

    Strain gauge sensors have a permissible excitation voltage, and exceeding it causes heat generation and drift. Compare the recommended excitation voltage in the sensor specifications with the bridge power supply of the transmitter. If cable runs are long, also check whether remote sensing is available to compensate for voltage drop.

  4. 4. Response bandwidth suited to the rate of change of the measured quantity

    For measuring fast phenomena such as impact loads or torque fluctuations, a model with a wide frequency response range is required. Listed examples include high-response types with a response frequency of 25 kHz and digital types with 2 kHz. For static measurements, check whether a low-pass filter can be set to suppress noise.

  5. 5. Nonlinearity relative to required accuracy

    Nonlinearity is the deviation of output relative to input, expressed as a percentage of full scale, and listed products range from 0.01 to 0.05% F.S. The overall system accuracy is determined by the sum of the errors of the sensor and the transmitter. Determine the required grade together with the accuracy of the sensor side.

  6. 6. Match power supply and installation form to the equipment

    Match whether the power supply is AC or DC 24 V to the power configuration of the control panel. For integration into equipment or multi-channel use, board-type or multi-channel models save space. Check the external dimensions, mass (0.05 to 2.5 kg) and power consumption, and confirm that they fit the available installation space and power capacity.

This guide was written by AI based on the listed products' documents and specification items. Check each manufacturer's documents before adopting.