The devices of the series Precont® PS with integrated digital evaluation electronic are compact pressure switches for supervision, control and continuous measurement of pressures up to 1000 bar. By this the replacement of mechanical contact manometer is possible. Besides a bright luminous 4-digit LED display there are up to 2 free configurable PNP switching outputs incl. 4…20mA output available. The use is possible in gases, steams, liquids, oils and dusts inside closed containers or pipelines at process temperatures from – 40°C up to +125°C. The extremely short reaction time of 3ms allows also the use in hydraulic units and in pneumatic applications.
The pressure switch Precont® PS is mounted in the wall of the pressure container or of the pipe.
Characteristics of the dry ceramic measuring membrane – Precont® PSK
The system pressure is applied to the ceramic membrane and causes there a deflection of the thick film strain gauge at the back side of the membrane.
The ceramic membrane offers excellent characteristics like high pressure and pressure blow strength up to four times the nominal pressure, very high resistance against chemicals and corrosion and also very good insensitiveness against temperature shocks, high accuracy and reproducibility, good long term stability and at least a very low temperature influence.
The pressure signal that is transmitted from the membrane to the strain gauge is transformed into an electrical signal that is recorded and processed in high resolution by a processor.
The pnp switching output resp. outputs are driven according to the respective settings.
When using the analogue signal current output the recorded pressure signal is adjusted according to the settings and transformed into a high resolution output signal of 4…20mA.
By 3 sensor keys and the four digit LED display all settings for the pnp output resp. outputs, the display and also the analogue output can be set resp. adjusted.
Permissible supply voltage: 11.2 V up to 35 V DC
Power consumption: ≤ 50mA incl. analogue output with greater than 22.5 mA
Switching outputs idle
Function: PNP switching to + vs
Output current: ≤ 250 mA power limited, short-circuit-proof
Analog output 4… 20mA
Workspace: 4… 20mA
Resolution: ≤ 1 µA
Response time: ≤ 3ms
Characteristic deviation: ≤ ± 0.5% FS
Long term drift: ≤ ± 0.15% FS / year not cumulative
Temperature deviation :
≥ 4 bar ≤ ± 0.1% FS / 10 K
≤ 1 bar ≤ ± 0.2% FS / 10 K
Membrane: Ceramics, AL2O3 96% (medium touching)
Process fitting: steel 1.4404 (AISI 316L) / 1.4571 (AISI 316Ti) (medium touching)
Connector housing: Stainless steel / PC polycarbonate
Seals: (medium touching)
FKM – Fluoroelastomer (Viton ®)
EPDM – ethylene-propylene used monomer
CR – Chloroprene (neoprene ®)
FFKM – Perfluoroelastomer (Kalrez ®)
NBR – nitrile-butadiene rubber
Ambient temperature:-40 ° C… + 85 ° C
Process temperature:-40 ° C… + 100 ° C or + 125 ° C
Process pressure ranges:-1 bar… 600 bar
Protection class: IP68 / 1mH2O for 1h DIN EN 6052