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

 [caption id="attachment_54686" align="aligncenter" width="487"]programmable display unit PDU–420–W 

 programmable display unit PDU–420–W

The PDU-4x0-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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Locationpanel version
Power supply voltage
version 230 V230 V AC ± 10%
version 24 V24 V DC ± 15%
Power consumption
version 230 V2,6 VA
version 24 V4,5 W
Voltage inputcurrent 0/4 ... 20 mA (limited input current to 40 mA)
voltage 0/1 ... 5 V; 0/2 ... 10 V
Voltage input resistance< 65 Ω (current input)
> 50 kΩ (voltage input)
Display range -999 - 9999, plus decimal point
Voltage measurement accuracy ± 0,25 %
(± one digit over the entire measuring range)
Display4-digit, seven-segment, LED, red
Outputs relay2 (relay 1 A / 250 V AC)
Sensor power supply outputs
 version 230 V24 V DC ± 3 V, max. 25 mA
version 24 V24 V DC ± 15%, max. 100 mA
Communication interfaceRS–485, 8N1 and 8N2, Modbus RTU, no galvanic separation
Baud rate 1 200 ... 115 200 bit/s
Operating temperature0 ... + 50°C; (-20 ... +50°C) *
Storage temperature -10 ... + 70°C; (-20 ... +70°C) *
Housing materialABS + fiberglass
Weight cca340 g

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