SITRANS P Compact pressure transmitter

The use of high-grade materials guarantees compliance with hygiene regulations.

Particular value has been placed on a high surface quality. The system can be electropolished in addition.

A further important feature is the hygiene-based design of the process connection by means of various aseptic connections.

The completely welded stainless steel housing can be designed up to degree of protection IP67.

Using appropriate thermal decouplers, the SITRANS P Compact pressure transmitter can be used for process temperatures up to 200 °C (392 °F).

■Benefits

• Measuring ranges from 0 to 160 mbar (0 to 2.32 psi) to 0 to 40 bar (0 to 580 psi)

• Linearity error including hysteresis < +0.2 % of full-scale value

• Piezo-resistive measurement system, vacuum-proof and overload- proof

• Hygiene-based design according to EHEDG, FDA and GMP recommendations

• Material and surface quality according to hygiene requirements

• Wetted parts made of stainless steel; completely welded

• Signal output 4 to 20 mA (0 to 20 mA as option)

• Stainless steel housing with degree of protection IP65 (IP67 as option)

• Process temperature up to 200 °C (392 °F)

• Explosion protection II 2G Ex [ib] IIC T6 to ATEX

• Easy and safe to clean

■Application

The SITRANS P Compact pressure transmitter is designed for the special requirements of the food, pharmaceutical and biotechnology industries.

The use of high-grade materials guarantees compliance with hygiene regulations.

The SITRANS P Compact pressure transmitter is available in many versions. Exact adaptation of the pressure transmitter to conditions at the place of use is thus possible

■Design

The electronics is potted to protect it against moisture, corrosive atmospheres and vibration.

Notes on operating the pressure transmitter

Compensation of internal atmospheric pressure

Compensation of the internal atmospheric pressure of the

SITRANS P Compact pressure transmitters is performed as follows:

• in the plug versions by means of the screwed gland (IP65)

• in the field housings by means of an integral sintered filter (IP65) or a vented cable (IP67)

• in versions with cable outlet by means of a vented cable (IP67)

In the absolute pressure range there is no need for compensation with respect to atmospheric pressure.

Note: These degrees of protection are only achieved under the

following conditions:

• if the pressure transmitter is installed correctly

• if the screwed glands are securely tightened

• if the cable diameters agree with the nominal diameters of the gaskets in the housing

Note:

The integral EMC measures are only effective if the earth connection is made correctly.

CE marking

The CE marking of the pressure transmitter certifies compliance with the guidelines of the European Council (9/336/EC), the EMC law (13.11.1992), as well as the applicable generic standards. Interference-free operation in systems and plants is achieved only if the specifications for shielding, earthing, cable routing and electrical isolation are observed during installation and assembly. Hazardous areas

Note:

Electrical equipment in hazardous areas must only be installed and operated by trained personnel.

Modifications to units and connections result in cancellation of the explosion protection and guarantee.

With intrinsically-safe circuits, make sure that equipotential bonding exists throughout the complete cabling inside and outside of the hazardous area. The limits specified in the ATEX approval must be observed.

■Function

The process pressure acts on a piezo-resistive semiconductor measuring bridge through a remote seal and a transmission liquid.

The pressure transmitter converts the pressure values into a load-independent current.

A compensation network makes the output signal largely independent of the ambient temperature. As a result of a specially adapted remote seal connection with minimized volume, the influence of the process temperature on the output signal is greatly reduced compared to a conventional screw connection.

The pressure transmitters can be powered with a non-regulated DC voltage of 10 to 30 V. Output signals common to measuring technology are available.

■Dimensional drawings