- Wide range combination sensor Pirani / Bayard Alpert
- Bayard Alpert with blowing resistant, yttrium coated double filament
- Longterm tests confirm excellent life time and resistance: up to 100,000 shock venting cycles
- The Pirani sensor´ s extended range allows for preserving operation of hot cathode at lower pressure
- Activation and deactivation of the hot cathode by the Pirani for enhanced durability
- Excellent accuracy and repeatability
- Small volume of the measuring cell e. g. 20 cm3 for VSH88D
- Baud rate 9.6 kBd to 115 kBd
- Correct pressure readings by means of separate gas type correction factors for Pirani and hot cathode
VSH8xD Vacuum Transducer ● 1000 to 5e-10 mbar
€ 1.034,00 – € 1.091,00 excl. VAT and transport costs
The digital combination transducer VSH (Pirani/hot cathode) measures absolute pressure from atmospheric pressure to ultrahigh vacuum.
- Digital RS485 interface and additional analog output signal 0 – 10 V
- Digital adjustment of zero and atmospheric pressure via pushbutton or interface
- Two independent, potential-free relay switch points
- LEDs for device status and switch points
- Protection class up to IP54
- Output signal scalable according to required output characteristics
for an easy replacement of existing transducers
- Easy connection with PLCs
- Rugged, EMI-proof metal housing
- The digital output signal can be transmitted
failure-free over long distances (up to 500 m)
- Bluetooth adapter available (reach up to 100 m)
- Suitable for Thyracont 2 and 4 channel controllers VD12 / VD14
- VacuGraph™ Windows software to visualize, analyze and save measurements
- Easily replaceable sensor heads with stored calibration data
|Dimensions||4.8 x 6.9 x 1.46 cm|
Pirani / Bayard Alpert, depending on gas type
|Materials In Contact With Vacuum||
Stainl. steel 1.4307, tungsten, nickel, glass, platinum, iridium, yttria oxide
1000 – 5e-10 mbar (750 – 5e-10 Torr), max. overpressure 4 bar abs.
10 – 1e-8 mbar: < 10 % from reading, 1000 – 10 mbar: < 30 % from reading
±2 % (10 – 1e-2 mbar), 5% (1e-2 – 1e-8 mbar)
50 ms (switching of emission current < 2s)
9 µA, 100 µA, 1.0 mA, 2.0 mA
Ohmic heating of the anode
20 – 30 VDC
SubD 15pol., male, lockable
Max. 8 W, additional 1 W f. degas and 0.8 W f. relays
|Max. Bake Out Temperature||
Max. 180°C at the flange (voltage supply switched-off)
0 – 10 VDC, min. 10kΩ, measuring range 1.219 – 8.6 VDC, log.
RS485: 9,6 kBd to 115 kBd, 8 databit, 1 stopbit, no parity
2x relay, potential free, 50 VAC / 2 A, 30 VDC / 2 A, max. 60 VA
DN 25 ISO-KF (VSH87), DN 40 ISO-KF (VSH88), DN 40 CF-F (VSH89)
IP40; IP54 with XB15SL05 adaptor
VSH87D with DN 25 ISO-KF flange, VSH88D with DN 40 ISO-KF flange, VSH89D with DN 40 CF-F flange
What is the difference in applications between a cold cathode and a hot cathode sensor?
Hot cathode sensors are mainly used for measurements where precision (<15%) is necessary. For measurements in the ultra-high-vacuum range down to 5e-10 mbar we also recommend our hot cathode. Cold cathode sensors are more durable in a lot of applications and therefore interesting for environments where the sensor is confronted with dust, oil or other pollution. The cold cathode measuring cell can be partly disassembled and cleaned (e.g. with Scotch Brite). The VSH offers compared to VSM a higher accuracy and a wider measuring range down to 5e-10 mbar. If necessary the sensor heads of both transducersr can be changed to assure a high plant availability.
How can I program parameters like e.g. switching points or gas type correctional factors?
The vacuum transmitters VSM and VSH are programmed via their RS485 interface. They respond e. g. on type requests, measurement requests, adjustment commands and commands for gas type correctional factor. It is also possible to program both relay switchpoints of the transmitter via RS485. Beyond that the configuration of certain parameters that affect the characteristics of the sensor system (e.g. transition of the pirani and the ionization sensor) can be changed. On request the hot and cold cathode can also be switched on and off via RS485.
Is it possible to clean the sensor head of the VSH?
No, hot cathode sensors are not suited for cleaning.
Do I have to mount the transducer into a specific position?
Basically the vacuum transducers 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. 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 transmitter?
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. On request we can offer a works calibration (item no. ADJCERT).
How can I exchange the sensor heads of the transmitters?
The exchangeable, pre-adjusted sensor-heads of the Smartline transmitters can be exchanged fast and easy by the user to assure best compatibility. Loosen the attachment screws around the head, exchange the sensor-head and reattach the attachment screws. After a heating-up phase of 15 minutes press the “Adjust” button, the sensor system and the electronics will be aligned automatically and the transmitter is ready to use.
power supply, protection case, software, …
for compatibility with competitor products, Bluetooth, USB, …
- Cables and Mating Plugs
cables with open ends, cables for vacuum controllers, mating plugs, …
works calibration, DAkkS calibration, …
- Spare Parts
calibrated exchange sensors