Dinel LDU–401 Local Process Indicator

Dinel LDU–401 Local Process Indicator is fit for all level meters with 4 … 20 mA with 2-wire technique. Customers can use the two buttons to program the zero point, span, decimal point, damping and alarm point, etc. Over or under range are displayed as a message.

The integrated smart diagnostic system continuously monitors all device functions. The programmed parameters are stored in an EEPROM and being kept in case of a power failure. The plug-on display is simply plugged in between the connector and socket; it is then ready for operation.

Dinel LDU–401 Features

• For local display of measured value (level)
• Easy direct mounting onto a level meter under the connector
• 4-digit LED display
• Easy setting by 2 button
• Processor control of the display
• Powered from the current loop (4 … 20 mA)

The firm Dinel, s.r.o. was founded in 1995, after transformation from the small private firm, which produced capacitive sensors since 1991. Nowadays Dinel, s.r.o. is one of the most influential producers of level measurement systems in the Czech Republic with big annual increases in sales and strong innovative potential.

Our level meters and limit sensors fulfill various requirements in a wide range of industrial branches, e.g. agricultural technology and food industry, plastic materials technology, chemical industry, petroleum and gas filling stations, in heating and water processing technology, building materials processing technology, packaging technology, in transport vehicles, etc. Besides, our power supplies, control units, and controllers are very frequently used in various control and measuring systems.

Thanks to flexible manufacturing and logistics we are well able to deliver a product that fully meets your requirements while keeping good terms and prices. We willingly help you with the choice of the best measuring method and an appropriate device. All of our products meet the requirements of European directives and norms. We keep 3 years warranty on all range of our products.

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.

Range of application

The unit is designed to be coupled with the level meter, which is connected via current or voltage output. The unit continually displays level in any physically units, according to selected limits, it can control switching of connected equipment (pumps, valves etc.) and it can be used as power supply for level meters too.

Mechanical mounting

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 circuitbreaker 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. Wiring must meet appropriate standards and local regulations and laws. In order to secure against accidental short circuit the connection cables must be terminated with appropriate insulated cable tips. Tighten the clamping screws. The recommended tightening torque is 0.5 Nm. Loose screws can cause fire or defective operation. Over tightening can lead to damaging the connections inside the units and breaking the thread. Due to possible significant interference in industrial installations appropriate measures assuring correct operation of the unit must be applied. To avoid the unit of improper indications
keep recommendations listed below.

• Avoid running signal cables and transmission cables together with power supply cables and cables controlling inductive loads (e.g. contactors). Such cables should cross at a right angle.
• Contactor coils and inductive loads should be equipped with interference protection systems, e.g.
  RC-type.
• Use of screened signal cables is recommended. Signal cable screens should be connected to the
  earthing only at one of the ends of the screened cable.
• In the case of magnetically induced interference the use of twisted pair of signal cables is recommended. Twisted pair (best if shielded) must be used with RS-485 serial transmission connections.
  • In the case of measurement or control signals are longer than 30m or go outside of the building
  then additional safety circuits are required.
  • In the case of interference from the power supply side the use of appropriate interference filters
  is recommended. Bear in mind that the connection between the filter and the unit should be as
  short as possible and the metal housing of the filter must be connected to the earth with the largest possible surface. The cables connected to the filter output must not be run with cables with
  interference (e.g. circuits controlling relays or contactors).

Dinel LDU–401 Specification

Download Catalog: LOCAL PROCESS INDICATOR LDU-401

Ref: Dinel.cz

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