Capacitive sensors
Three different types of capacitive sensors:
Triaxial
Pseudo Triaxia
Coaxial
Triaxial and pseudo triaxial capacitive sensors are used most of the time, while coaxial capacitive sensors are seldom seen.
Comparison of three different technologies
| Triaxial | Pesudo Axial | Coaxial | |
| Static measurement | Excellent | Good at short time | Bad |
| Dynamic measurement | Excellent | Excellent | Mean |
| Vibration rejection (cable) | Excellent | Excellent | Mean |
| Rejection of temperature | High | HIgh | Mean |
| Cable length effect | Mean | Mean | High |
Standard products
TURBOCOAX ® 1100 triaxial
Body: Inconel® alloy 600, thread or smooth
Insulation: highly compacted magnesia powder
Outer diameter: 2 mm and more
Pressure: 0.5 to 40 bars
Vibrations: <150 G, 10 to 20 KHz
Temperature range: -55°C up to 1000°C nominal
Maximum gas temperature : 1 100°C peak
Sensor types: triaxial or pseudo triaxial
| Electrode | Overall dimension | Clearance range* | Mounting | |
| Pseudo triaxial | Ø 4 mm | Ø 6.28 mm | From 0 mm up to 10 mm | Electrode: Kovard alloy Body: Inconel® alloy 600 Mounting: thread or smooth with flange for welding |
| Ø 4.5 mm | Ø 6.33 mm | |||
| Ø 5 mm | Ø 9 mm | |||
| Ø 8 mm | Ø 14 mm | |||
| Triaxial | Ø 3 mm | Ø 8.2 mm | From 0 mm up to 20 mm | |
| Ø 8 mm | Ø 20 mm | |||
| Ø 17 mm | Ø 22 mm |
TURBOCOAX ® 1400 pseudo triaxial
Ceramic / Platinum brazing know-how
Body: Inconel® alloy 600, thread or smooth
Insulation: highly compacted magnesia powder
Outer diameter: 2 mm and more
Pressure: 0.5 to 40 bars
Vibrations: <150 G, 10 to 20 KHz
Temperature range: -55°C up to 1300°C nominal
Maximum gas temperature : 1 400°C peak
Type of sensor: triaxial
| Electrode | Overall dimension | Clearance range | Mounting | |
| Pseudo triaxial | Ø 4.25 mm | Ø 10 mm | Up to 4 mm | Smooth with flange to be welded |
Constructions
Pseudo Triaxial Sensors
Operating temperature: 1400℃
Triaxial sensors
Operating temperature: 1000ºC
