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Digital indicator

A digital indicator supplies bridge excitation voltage to strain-gauge sensors such as load cells and pressure transducers, amplifies and A/D converts their minute output voltage (mV/V), and displays physical quantities such as load or pressure as numerical values. The listed products have an internal A/D resolution of 24 bit. Available types include panel-mount units, compact units for installation inside control panels, DIN rail-mount signal conversion modules, and board-type units for integration into equipment. Some models use peak hold to capture the maximum load during press-fitting and pressing, some compute the sum or difference of multiple sensors for tension control, and others display multiple channels at once. They are used in weighing, press processing, tie bar management on injection molding machines, and production line monitoring.

How to choose Digital indicator

  1. 1. Input range matching sensor output

    Confirm that the rated output (mV/V) of the strain-gauge sensor falls within the input range of the indicator. If the range is too wide, the resolution cannot be fully utilized; if too narrow, the input saturates. Check against the rated output in the load cell's calibration certificate.

  2. 2. Bridge excitation and number of connected sensors

    Confirm that the excitation voltage supplied to the sensor is at or below the sensor's recommended excitation voltage. When multiple load cells are connected in parallel, the combined resistance decreases and current increases, so also check whether the indicator can supply the required load conditions.

  3. 3. Sampling speed suited to the process speed

    In processes where the load changes over a short time, such as press-fitting, pressing, or punching, a slow A/D sampling rate may miss peak values. For static weighing, a low speed is sufficient. Note that this value is different from the display update rate (display refresh count).

  4. 4. Required display digits and resolution

    Determine the required number of display digits from the capacity and minimum scale division, and confirm that the display range meets them. Check not only the display resolution but also whether the actual measurement accuracy, including non-linearity (0.02% F.S. for the listed products), meets the requirement.

  5. 5. Mounting method and external dimensions

    Confirm that the panel cutout dimensions and depth fit the panel or enclosure. Select the mounting method as well, such as DIN rail type for installation inside a control panel or board type for equipment integration. Also check the required outputs and communication options, such as CC-Link, RS-232C, or BCD, at the same time.

  6. 6. Power supply type and power consumption

    Check whether AC or DC power is required, whether wide-range power input is supported, and whether battery operation is possible, according to the installation environment. Power consumption of the listed products ranges from 2.4 to 25 W, which is used for evaluating the power capacity and heat generation inside the panel.

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