- Cost-efficient Pirani sensor with durable, elastic helix filament
- Filament protected from condensing solvents by a metal screen
- Compact dimensions
- Very small sensor volume
- Integrated temperature sensor
- Optionally with cap to protect the sensor against dust and humidity
- Sensor pre-adjusted
- Vacuum connection by stainless steel small flange DN 16 ISO-KF
- External sensor for compact vacuum meter VD84
- Proposal for evaluation circuit available on request
VSP841 Passive Vacuum Sensor ● 100 to 1e-3 mbar ● DN16KF
€ 107,00 excl. VAT and transport costs
The VSP841 Pirani half bridges measures absolute pressure in the fine vacuum range. The robust heat conduction sensor is compact, pre-adjusted and temperature compensated.
It is suitable for controlled and passive bridge circuits and as sensor for monitoring of vacuum isolations, readout of measurements with VD84 (compact vacuum meter and data logger).
|Dimensions||3 x 3 x 6.9 cm|
Pirani, depending on gas type
1000…100 – 1e-3 mbar (750…75 – 1e-3 Torr), max. overpressure 4 bar absolute
Dependent on the evaluation circuit, e. g. 10 – 1e-2 mbar: Approx. 15% from reading
Approx. 200 ms
Supply of bridge circuit according to circuit proposal or with VD84 (compact vacuum meter and data logger)
4 pole circular plug binder 713, screwable
Approx. 30 mA
|Max. Bake Out Temperature||
80°C at the flange
Change of bridge voltage depending on vacuum
DN 16 ISO-KF, stainless steel, Ni
Which output-signal is supplied by the sensor?
The VSP841/2 does not supply an output-signal. It is a passive pirani-sensor without evaluation electronics. On request, we are happy to provide an evaluation switching suitable for your application.
Is the Pirani sensor protected against pollution and dirt?
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
Is it possible to clean the Pirani sensor?
Depending on the type and intensity of the pollution, it is feasible to clean the sensor with isopropanol. To do this, you need to fill the measuring cell completely with isopropanol and let it rest for a few minutes. After removal of the fluid it is necessary for the cell to completely dry out. Please note that e.g. oil debris is baked onto the filament and is very tough or even impossible to clean.
Do I have to mount the vacuum sensor into a specific position?
Basically the instruments can be mounted in every position. The best accuracy is achieved if the flange of the instrument is mounted vertically, because the instruments are calibrated in this position. Also it is not recommended to mount the sensor at the bottom of a pipe, because condensate and dirt could be collected in the sensor cell.
How often do I need to recalibrate the vacuum sensor?
This depends on the specific application. Especially if there are coatings and contaminations on the sensor-head or if it is used in extreme temperature conditions it can be necessary to readjust the instrument. For quality assurance matters, we recommend to return the instrument for calibration every one or two years. We can offer a test certificate (item no. TEST) or alternatively a works calibration (item no. ADJCERT).