The 925-21024 Micro Pirani™ Vacuum Transducer with MEMS-based Micro Pirani™ Vacuum Sensor is a thermal conductivity vacuum gauge with touchscreen display based on a unique, MEMS-based (Micro-Electro-Mechanical Systems) vacuum sensor. This 925 transducer offers a wide measurement range from 1×10-5 Torr to atmosphere, and features a size NW25 ISO-KF flange fitting. It has a RS232 digital communication interface for setup of transducer parameters and to provide real time pressure measurement. A 15-pin HD sub-D male connector features an analog pressure output of 1VDC/decade that can be interfaced to external analog equipment for pressure readout or controlling. The MicroPirani sensor consists of a silicon chip with a heated resistive element forming one surface of a cavity. A cover on top of the chip forms the other surface of the cavity. Due to the geometry of the sensor, convection cannot take place within the cavity and consequently, the sensor is insensitive to the mounting position. Gas molecules are passed by diffusion only to the heated element where the heat loss of the gas is measured. Like all thermal conductivity sensors, the 925 is sensitive to gas type. To compensate for gas dependency, the MicroPirani has a number of common gas calibrations that can be selected via the digital interface. This makes it a simple solution for locating medium to fine leaks in vacuum systems. The 925 compact design significantly reduces the amount of space occupied by a vacuum gauge. This is particularly appealing to system designers and allows for a more compact vacuum system. The integrated touch-screen display is user configurable allowing the user to change pressure units, orientation and access set point parameters as well as gas type. The display also indicates the status of the available set point relays. Displayed reading can be seen from >5 meters away on the high contrast display.
Технические характеристики
- Type Vacuum Transducer
- Sensor Type MicroPirani (MEMS Thermal Conductivity)
- Display 1.0 x 10-5 to 760 Torr
- Vacuum Pressure Range 1.0 x 10-5 to 760 Torr
- Analog Output 1-9 VDC (1 VDC per Decade)
- Accuracy 5 x 10-4 to 10-3 Torr ±10% of Reading, 10-3 — 100 Torr ±5% of Reading, 100 Torr to Atmosphere ±25% of Reading (typical)
- Orientation Any
- Fitting Type NW25 ISO-KF
- Set Point Relays 0
- Exposed Materials 304 stainless steel, Silicon, SiO2, Si3N4, Gold, Viton, Low out gassing epoxy resin
- Overpressure Limit 3000 Torr (absolute)
- Power Requirements 9 — 30 VDC,
- Maximum Bakeout Temperature 85°C (185°F)
- Operating Temperature Range 0 — 40°C (32 — 104°F)
- Electrical Connector 15-pin, High Density, D-sub male
