Description
Gold-plated probes have 5 µm diameter, 3 mm long platinum-plated tungsten wire sensors. The wire ends are copper- and gold-plated to a thickness of 15 to 20 µm, leaving an active sensor, 1.25 mm, on the middle of the wire.
They are designed for measurements in high-turbulence flows of three-dimensions. The plating of the ends serves the dual purpose of accurately defining the sensing length and reducing the amount of heat dissipated by the prongs. An advantage is less flow interference from the prongs at the point of measurement due to the wider prong spacing. Both increase the accuracy at high turbulence levels.
Configurations
The Triple-sensor gold-plated wires probe is available in one straight configuration for gas applications only.
Gold-plated tri-axial probe (55P95)
Tri-axial sensor probes have three mutually perpendicular sensors, consisting of gold-plated wires. The sensors form an orthogonal system with an acceptance cone of 70.4°. The prong ends are all perpendicular to the sensors. This gives minimum prong interference and increases the accuracy, when the three probe signals are decomposed into velocity components. Used for measurement of the U, V and W velocity components in an instationary three-dimensional flow field. Provides information for calculation of the full Reynolds shear stress tensor. Mounts with the probe axis in the main flow direction. The resulting velocity vector must be within the acceptance cone.
Mounting: 6 mm dia. probe support for triple-sensor probes.
| Technical Data For Gold-plated Wire Sensors | |
|---|---|
| Medium | Air |
| Sensor material | Platinum-plated tungsten |
| Sensor dimensions | 5 µm dia, 1.25 mm long The overall wire lenght is 3 mm |
| Sensor resistance R20 (approx.) | 3.5 Ω |
| Temperature coefficient of resistance (TCR) α 20 (approx.) | 0.36%/°C |
| Max. sensor temperature | 300°C |
| Max. ambient temperature | 150°C |
| Max. ambient pressure | Depends on the type of mounting |
| Min. velocity | 0.05 m/s * |
| Max. velocity | 200 m/s |
| Frequency limit fcpo (CCA mode, 0 m/s) |
90 Hz |
| Frequency limit fmax (CTA mode) |
400 kHz |
* Influence from natural convection up to approx. 0.20 m/s.
