Pressure Sensors Pressure Sensors with SIL 2 / PLd Functional Safety
Variohm Euro Sensor’s SMO3100 series pressure sensors are now available with SIL 2/ PLd functional safety. Aimed at safety-critical pressure measurement tasks for gas and liquids compatible with stainless steel or titanium wetted parts, the new SMO3100 PLd will allow user’s the ability to meet SIL2 functional safety levels on machines and systems. The robust and durable sensor series is available in twenty pressure range versions from 0.5 to 5000 bar and with best accuracy to 0.5 % F.S.
Based on a piezo resistive sensing element as well as the latest Asic circuitry, the SMO3100 PLd features a 4…20 mA output from a 10 to 32 VDC supply to provide high precision linearity and repeatability. Its high strength 304 stainless steel housing offers excellent durability in demanding industrial machinery applications, states the firm. Standard environmental protection meets IP67, and IP69K is optionally available.
With the standard version’s well proven use in demanding environments such as motorsports, off-road vehicles, construction equipment and agricultural machinery, the sensor boasts of a high shock and vibration resistance together with a generous over-range and burst pressure specification of 2x and 5x respectively. According to the company, rated life is 10 million pressure cycles and an impressive 100 year MTTFd factor demonstrates its excellent endurance. The new pressure sensors include a measuring medium temperature range of -40 to +125 °C with a compensated range from -20 to +85 °C.
The new version brings DIN EN ISO 13849-1 Performance Level d (PLd), enabling ECU and other safety controlled systems to meet IEC 61508, 61511 and 62061 standards for Safety Integrity Level (SIL) 2 functional safety on machines and system. The sensor detects internal failures within a predefined diagnostic range for its output signal. Internal failures include broken bond wires, internal EEPROM errors and internal watchdog errors.
As with the standard SMO3100, the PLd version is available for absolute, gauge and vacuum pressure measurement, adds the firm. Port configuration options include most commonly required types in NPT, UNF and metric thread sizes with the electrical interfacing covering cable and connectors for DIN EN175301-803, M12 and Packard Metripac.