The pressure transmitters of the DS III series, can be used in industrial areas with extreme chemical and mechanical loads. Electromagnetic compatibility in the range 10 kHz to 1 GHz makes the DS III pressure transmitters suitable for locations with high electromagnetic emissions.

Pressure transmitters with type of protection "Intrinsic safety" and "Flameproof enclosure" may be installed within potentially explosive atmospheres (zone 1) or in zone 0. The pressure transmitters are provided with an EC type examination certificate and comply with the corresponding harmonized European standards (ATEX).

Pressure transmitters with the type of protection "Intrinsic safety" for use in zone 0 may be operated with power supply units of category "ia" and "ib".

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

The pressure transmitter can be programmed locally using the 3 control buttons or externally via HART or PROFIBUS PA or FOUNDATION Fieldbus interface.

Pressure transmitter for gauge pressure

Measured variable: Gauge pressure of aggressive and non-aggressive gases, vapors and liquids.

Span (fully adjustable)
for DS III with HART: 0.01 bar to 700 bar (0.15 psi to 10153 psi)

Nominal measuring range
for DS III with PROFIBUS PA and FOUNDATION Fieldbus: 1 bar to 700 bar (14.5 psi to 10153 psi)

Pressure transmitters for absolute pressure

Measured variable: Absolute pressure of aggressive and non-aggressive gases, vapors and liquids.

Span (fully adjustable)
for DS III with HART: 8.3 mbar a to 100 bar a (0.12 to 1450 psi a)

Nominal measuring range
for DS III with PROFIBUS PA and FOUNDATION Fieldbus: 250 mbar a to 100 bar a (3.6 to 1450 psi a)

There are two series:

• Gauge pressure series
• Differential pressure series

Pressure transmitters for differential pressure and flow

Measured variables:

• Differential pressure
• Small positive or negative pressure
• Flow q ~ v?p (together with a primary differential pressure device (see Chapter "Flow Meters"))

Span (fully adjustable)
for DS III with HART: 1 mbar to 30 bar (0.0145 to 435 psi)

Nominal measuring range
for DS III with PROFIBUS PA and FOUNDATION Fieldbus: 20 mbar to 30 bar (0.29 to 435 psi)

Pressure transmitters for level

Measured variable: Level of aggressive and non-aggressive liquids in open and closed vessels.

Span (fully adjustable)
for DS III with HART: 25 mbar to 5 bar (0.363 to 72.5 psi)

Nominal measuring range
for DS III with PROFIBUS PA and FOUNDATION Fieldbus: 250 mbar to 5 bar (3.63 to 72.5 psi)

Nominal diameter of the mounting flange

• DN 80 or DN 100
• 3 inch or 4 inch

In the case of level measurements in open containers, the low-pressure connection of the measuring cell remains open (measurement "compared to atmospheric").

In the case of measurements in closed containers, the lower-pressure connection has to be connected to the container in order to compensate the static pressure.

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