Programmable display unit PDU–420–W, Dinel-Level and Flow Measurement

programmable display unit PDU–420–W
programmable display unit PDU–420–W
programmable display unit PDU–420–W

The PDU-4×0-W meter is equipped with one current input 0-20 / 4-20mA and one voltage input 0-5 / 1-5 / 0-10 / 2-10V. The current input has an additional overcurrent protection circuit, which protects the standard resistors. The selection of active input is realized by software, and selected input can be changed at any time. Additionally, the PDU-420-W allows users to select a conversion characteristic of several kinds: linear, square, square root, user-defined (max.20 points length), and volume characteristics of a cylindrical tank in the vertical and horizontal position. The result is shown on the 4-digit LED display


  • Suitable for connecting water level meters with a current or voltage output.
  • 4–digit LED display.
  • 2 relay outputs
  • Includes an auxiliary voltage power supply for current loop 4 … 20 mA.
  • Wall-mounted case (IP65).
  • Communication interface RS–485 / Modbus RTU.
  • Power supply 230 V AC or 24 V DC.

Electrical Connection

The unit is not equipped with an internal fuse or power supply circuit breaker. Because of this, an external time-delay cut-out fuse with a small nominal current value must be used (recommended bipolar, max. 2A), and a power supply circuit breaker located near the unit. In the case of using a monopolar fuse, it must be mounted on the phase cable (L). The power supply network cable diameter must be selected in such a way that in the case of a short circuit of the cable from the side of the unit the cable shall be protected against destruction with an electrical installation fuse.

Note: In case of measurement (evaluation) of the values from the level meter located in areas with an explosion hazard, it is necessary to install an isolating repeater between the PDU display unit and the level meter.

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