B_VSH Replacement Sensor ● Pirani/Hot Cathode ● for Smartline VSH

The Smartline vacuum transducers are programmed via their RS485 interface. They respond e. g. on type requests, measurement requests, adjustment commands and commands forsetting gas type correction factors. It is also possible to program both relay switching points of the gauge via RS485.

Yes, in the pressure range above 15 mbar.

All Thyracont Pirani sensors are fitted with a cover which protects against basic condensation and pollution. If the sensors are used in an extremely polluted environment, it is advised to additionally either use an extension pipe, an elbow fitting, a cooling trap or a seal ring with a sinter filter. We recommend keeping the transducer switched on permanently, as a hot Pirani filament is less susceptible to contamination.

Depending on the type and intensity of the pollution, it is feasible to clean the sensor with isopropanol. To do so, you need to fill the measuring cell completely with isopropanol and let it rest for a few minutes. After removing the fluid, the measuring must dry out completely. Please note that if e.g. oil debris is baked onto the filament, it is very difficult or even impossible to clean.

In principle, the devices can be installed in any position. You will achieve the most accurate measurement results if the flange of the device is horizontal, as the devices have been calibrated in this position. Mounting the sensor from below is not recommended, as condensation and dirt can collect in the measuring cell.

The period between calibrations depends on the specific application. In particular, deposits and dirt in the sensor, but also use under extreme temperature conditions, can make readjustment necessary. For quality assurance, we recommend sending the devices in for calibration every one or two years. We offer a factory calibration (article no. ADJCERT) or a DAkkS calibration (article no. DKDCERT).

The replaceable, pre-adjusted sensor heads of the Smartline transmitters can be replaced quickly and easily by the user to ensure consistently high system availability. To do this, the fixing screws of the sensor head are loosened, the sensor unit replaced and the screws refastened. After a warm-up time of approx. 15 minutes, press the Adjust button. The sensors and electronics are now automatically adjusted to each other and the transmitter is ready for operation.

Hot cathode transducers are mainly used for measurements where high precision (<15%) is required. We also recommend our hot cathode for measurements in the ultra-high-vacuum range down to 5e-10 mbar. Cold cathode transducers are more robust in numerous applications and therefore particularly interesting for applications where the sensor is exposed to dust, oil or other pollution. The cold cathode measuring cell can be patrially dismantled and cleaned (e.g. with Scotch Brite). Compared to the VSH, the VSM has a lower, but for a cold cathode very good accuracy of <25%. To ensure high system availability, the sensor head of both transmitters can be easily replaced if necessary.

Yes, it is possible to partly dismantle the sensor head and to carefully clean it with Scotch Brite. Thereby, metallic debris and minor pollution can be easily removed.

Hot cathode sensors are not suited for cleaning.