- Wide range sensor Pirani / cold cathode
- The cold cathode sensor is automatically controlled by the Pirani
- Pirani with extended range allows operation of cold cathode at lower pressure
and increases lifetime
- Correct pressure readings by means of separate gas type correction factors
for Pirani and hot cathode
- Robust sensor design
- Small volume of the measuring cell e. g. 9 cm3 for VSM77D
- Excellent ignition behavior
- Insensitive against inrush of air
- Baud rate 9.6 kBd to 115 kBd
VSM7xD Vacuum Transducer ● 1000 to 5e-9 mbar
€ 975,00 – € 1.004,00 excl. VAT and transport costs
The digital combination transducer VSM (Pirani/cold 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
- Large, integrated LCD display with background illumination
- 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||6.9 x 4.8 x 15.3 cm|
Heat conduction Pirani / inverted magnetron, both depending on gas type
1000 – 5e-9 mbar (750 – 5e-9 Torr), max. overpressure 10 bar abs.
10 – 2e-3 mbar: <10 % from reading, 1000 – 10 mbar: <30 %from reading, 2e-3 mbar – 1e-8 mbar: <25% from reading
10 – 1e-2 mbar: Approx.. ±2% from reading 1e-2 – 1e-8 mbar: Approx.. ±7% from reading
50 ms (switch-on cold cathode
|Materials In Contact With Vacuum||
Stainl. steel 1.4307, nickel, tungsten, molybdenum, glass, Al2O3 ceramic
Max. 2,5 kV
20 – 30 VDC
SubD, 15-pole, male, lockable
Max. 3 W, additionally 0.8 W f. EtherCAT / relays / LCD; add. 1 W for Profibus, 1.8 W for Profinet
|Max. Bake Out Temperature||
Max. 160°C at the flange (voltage supply switched-off)
0 – 10 VDC, min 10 kΩ, measuring range 1.82 – 8.6 VDC, log. per default
9.6 kBd to 115 kBd, 8 databit, 1 stopbit, no parity
2 switch-over relays, 50 VAC / 2 A, 30 VDC / 2 A, max. 60 VA
DN 25 ISO-KF (VSM77), DN 40 ISO-KF (VSM78), DN 40 CF-F (VSM79)
IP40, IP54 with XB15SL05 adaptor
VSM77D with DN 25 ISO-KF flange, VSM78D with DN 40 ISO-KF flange, VSM79D 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 VSM is, compared to the VSH, not quite as precise, but still offers good resolution and precision for a cold cathode sensor (<25%). 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 VSM?
Yes, it is possible to partly disassemble the sensor head and clean it with Scotch Brite. Metallic debris and minor pollution can be cleaned like this easily.
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