Pressure transmitters for pressure, absolute pressure, differential pressure, flow and level

Application

Various versions of the DSIII series are available with a two-wire circuit. The output signal is a load-independent direct current of 4 to 20 mA linearly proportional to the input pressure.

Transmitters conforming to the type of protection 'Intrinsic safety' and 'Explosion-proof' may be installed within potentially explosive atmospheres (zone 1 or zone 0). The transmitters are provided with an EU prototype test certificate and comply with the corresponding harmonized European standards of the CENELEC. Transmitters with the type of protection 'Intrinsic safety' for use in zone O may be operated with power supply units of category "1a" and "1b".

The transmitters can be equipped with various designs of remote seals for special applications such as the measurement of highly viscous substances.

The transmitters can be programmed locally using three input keys or externally via HART. The following table describes the fundamental parameters. Further parameters for special applications are accessible via HART.

Transmitter for pressure

This type of transmitter measures the pressure of corrosive and non-corrosive gases, vapours and liquids. Spans are possible from 0.01 to 400 bar.

Pressure limit of medium for pressure transmitters

Transmitter for absolute pressure

This type of transmitter measures the absolute pressure of corrosive and non-corrosive gases, vapours and liquids

Two series are available

• "Pressure" series
• "Differential pressure" series

The "Differential pressure" series has a higher pressure limit for the medium.

Spans are possible from 8.3 mbar to 160 bar.

Pressure limit of medium for absolute pressure transmitters from the differential pressure series

Transmitter for differential pressure and flow

This type of transmitter is used to measure

• the differential pressure
• a small positive or negative pressure
• the flow q - v ?p (together with a primary differential pressure device)

Spans are possible from 1mbar to 30 bar.

Pressure limit of medium for differential pressure and flow transmitters

Transmitter for level

This type of transmitter with mounting flange measures the level of corrosive and non-corrosive liquids in open or closed containers. Spans are possible between 25 mbar and 5 bar. The nominal mounting flange diameter is DN 80 or DN 100, or 3 or 4 inch.

In the case of level measurements in open containers, the low-pressure connection of the measuring cell remains open (measurement with respect to atmosphere), while for measurements in closed containers, this connection must be connected to the container in order to compensate the static pressure.

The wetted parts are constructed from a variety of materials depending on the degree of corrosion resistance required.

Design and mode of operation

The DSIII series is immediately ready for operation following installation. The adjustable span corresponds to the data on the rating plate. If a customer-specific setting is made in the factory, the start-of-scale and full-scale values are printed on the rating plate.

If necessary, the parameters can also be changed during commissioning using simple input operations on the transmitter.