VSP Passive Vacuum Sensor ● 100 to 1e-3 mbar
€ 121.00 – € 123.00 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).
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).
Overview passive VSP vacuum transducer with Pirani sensor:
- 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
- Metal-sealed stainless steel sensor
- Sensor pre-adjusted
- Vacuum connection by stainless steel small flange DN 16 ISO-KF (VSP841) or 1/8″ NPT male thread (VSP842)
- External sensor for compact vacuum meter VD84
- Proposal for evaluation circuit available on request
Do you have questions regarding our passive VSP Pirani sensor? We will be pleased to assist.
Weight | 0.5 kg |
---|---|
Dimensions | 15 × 10 × 5 cm |
Measurement principle | |
Gas dependency | depending on gas type |
Measurement range mbar | |
Measurement range Torr | 750…75 – 1e-3 Torr |
Materials in contact with vacuum | Stainless steel 1.4305, tungsten, nickel, glass |
Accuracy | Dependent on evaluation circuit e.g. 10 – 1e-2 mbar: approx. 15 % f.r. |
Response time | Approx. 200 ms |
Voltage supply | Supply of bridge circuit according to circuit proposal |
Electrical connection | |
Power consumption | Approx. 30 mA |
Operating temperature | +10…+40°C |
Storage temperature | -20…+80°C |
Bake out temperature | |
Output signal | |
Vacuum connection | VSP841: DN16 ISO-KF, stainless steel, Ni, VSP842: 1/8"-NPT-male thread, stainless steel, Ni |
Material Number: | |
Dimensions | 47 x 20 x 20 mm (VSP841) |
Protection class | |
Weight | 60 g |
What does “piezoresistive” mean? By changing the pressure, a thin membrane deforms on which a resistor bridge is mounted on the rear. These piezoresisitive resistors change with strain and pressure. The resulting deformation is used to measure the absolute pressure. |
Which advantages does the “ramp-impulse method” offer against the standard Pirani sensor? The patented “ramp-impulse method“ measures conductivity by timing the duration of heating of the Pirani filament. It works at lower filament temperatures, therefore uses less power and offers a wider measurement range. |
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.In order to do so, 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 if e.g. oil debris is baked onto the filament and is very tough or even impossible to clean. |
Do I have to mount the instrument into a specific position? The instruments can be mounted in every position. The best accuracy is achieved if the flange of the instrument is mounted horizontally because the instruments are calibrated in this position. It is not recommended to mount the sensor at the bottom of a pipe as condensate and dirt could be collected in the sensor cell. |
How often do I need to recalibrate the compact vacuum meter? The period between calibrations depends on the specific application. Especially in cases of coatings and contaminations on the sensor-head or if it is used in extreme temperature conditions, readjust of the instrument can be neccessary. For quality assurance matters, we recommend to return the instrument for calibration every one or two years. We can offer a works calibration (article no. ADJCERT) or a DAkkS calibration (article no. DKDCERT). |
Which output-signal is supplied by the sensor? The VSP841/2 itself 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. In order to do so, 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 instrument into a specific position? The instruments can be mounted in every position. The best accuracy is achieved if the flange of the instrument is mounted horizontally because the instruments are calibrated in this position. It is not recommended to mount the sensor at the bottom of a pipe as condensate and dirt could be collected in the sensor cell. |
How often do I need to recalibrate the compact vacuum meter? The period between calibrations depends on the specific application. Especially in cases of coatings and contaminations on the sensor-head or if it is used in extreme temperature conditions, readjust of the instrument can be neccessary. For quality assurance matters, we recommend to return the instrument for calibration every one or two years. We can offer a works calibration (article no. ADJCERT) or a DAkkS calibration (article no. DKDCERT). |
What is the difference between the VD6 and the VD12 gauge sets? The VD6 is a compact 1 canal display and control unit suited for instrument panels (48×96 mm) for the transducers VSC43MA4 and VSP63MA4 only. The instrument has a USB-port for communication with a PC. Power supply and switching output are connected via phoenix strip terminal. |
What does “piezoresistive” mean? By changing the pressure, a thin membrane deforms on which a resistor bridge is mounted on the rear. These piezoresisitive resistors change with strain and pressure. The resulting deformation is used to measure the absolute pressure. |
How to set the switching point? After the disassembly of the case which prevents accidental adjustment, the setting of the switching point is done with a potentiometer. The value of the switching point is displayed as a 0-1V analog signal for control purposes. |
Can you display the measurement values? Yes, the measurement values are displayed as a 0-10 V analog signal. |
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