Miscellaneous Probes

Description

This group of special purpose probes does not fit into Dantec Dynamics’ ordinary probe program. These probes have been designed for use in specific flow applications, such as applications with extremely high temperatures or applications with fluctuating temperatures. This group also contains probes for wall shear stress measurements.

High Temperature Hot-wire Probe

For high-temperature applications up to 750°C, a wire probe with a 10 µm diameter, 2.2 mm long, platinum-rhodium wire sensor is available. The prongs are made of a nickel-chromium alloy with an almost zero temperature coefficient of resistance. In this way, temperature variations at the prongs will not cause resistance changes that will be interpreted as velocity changes. Platinum-rhodium is selected due to its relatively high temperature coefficient of resistance, 0.16%/°C, even if its mechanical strength is not outstanding. If high strength is needed the probe is available with a 10 µm diameter PtIr wire instead on a special probe basis.

High temperature hot-wire probe (55A75)

image of high temperature hot-wire probe


The high temperature probe is available in one straight probe configuration.

Mounting: No probe support. After removal of rear black cap, probe screws directly into 10 mm dia guide tubes.

Min. velocity 0.05 m/s *Frequency limit max (CTA mode) 150 kHz

Technical Data for Wire Sensors for High Temperature
Medium Air
Sensor material Platinum/Rhodium (90/10)
Sensor dimensions 10 µm dia, 2.2 mm long
Sensor resistance R20 (approx.) 6 Ω
Temperature coefficient of resistance (TCR) α 20 (approx.) 0.16%/°C
Max. sensor temperature 800°C
Max. ambient temperature 750°C
Max. velocity 350 m/s
Frequency limit fcpo (CCA mode, 0 m/s) 25 Hz
Frequency limit fmax (CTA mode) 150 kHz

* Influence from natural convection up to approx. 0.20 m/s.

Glue-on Film Probe

This is a special version of the flush-mounting probe, where the sensor is deposited on a Kapton™ foil, 50 µm thick. The sensor is 0.9×0.1 mm and connected to gold-plated lead areas. It is primarily intended for qualitative measurements of points of transition and separation. It is glued directly onto the wall in the points of interest. Copper wires soldered to the leads constitute the electrical connection between probe cable and probe. If the probe is used for quantitative measurements it must be calibrated in situ, as it normally cannot be removed when first glued in place.

Glue-on probe for air (55R47)

Determines the points of transition and separation and may measure skin friction and heat transfer numbers. The sensor is oriented perpendicular to the flow direction.

image of Glue-on probe for air

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Technical Data for Glue-on Film Sensors
Thickness of quartz coating 0.5 µm
Medium Air
Sensor material Nickel
Sensor dimensions 0.9 x 0.1 mm
Sensor resistance R20 (approx.) 15 Ω
Temperature coefficient of resistance (TCR) α 20 (approx.) 0.40%/°C
Max. sensor temperature 200°C
Max. ambient temperature 120°C


Parallel Array Probe

Parallel array probes have 5 µm diameter, 1.25 mm long plated tungsten wire sensors. The wires are welded directly to the prongs and the entire wire length acts as a sensor. The Parallel array probe is specially designed for measurement of extremely small turbulence in one-dimensional flows.

The probe body is a 2.3 mm diameter ceramic tubes, equipped with gold-plated connector pins that connect to the probe supports by means of plug-and-socket arrangements. Parallel array probes have marks (one and two dots) that indicate the sensor number.

Parallel array hot-wire probe (55P71)

The parallel array probe comes in one configuration with straight prongs.

image of parallel array hot-wire probe

Mounting: 6 mm dia. probe supports.

The two wires are supposed to measure the same turbulence simultaneously, whereafter the electronic noise can be filtered away using a correlation technique on the two signals. Mounts with the probe body parallel to the flow direction.

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* Influence from natural convection up to 0.20 m/s.

Technical Data for Miniature Wire Sensors
Medium Air
Sensor material Plated tungsten
Sensor dimensions 5 µm dia, 1.25 mm long
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 500 m/s
Frequency limit fcpo (CCA mode, 0 m/s)

90 Hz

Frequency limit fmax (CTA mode)

120 Hz

Temperature Probe

For measurements of quickly fluctuating temperatures, a wire probe with a 1 µm diameter, 0.4 mm long platinum sensor is available. The wire is spot welded to stainless steel prongs. It is used with a special constant current anemometer bridge and operated as a cold-wire probe with a measuring current a fraction of a mA.

The probe body is a 1.9 mm diameter ceramic tubes, equipped with gold-plated connector pins that connect to the probe supports by means of plug-and-socket arrangements.

Resistance thermometer, 1 micron wire (55P31)

The temperature probe is available in one straight probe configuration.

Technical Data for wire sensors for temperature measurements

This sensor is especially suited for temperature measurements, Max. sensor current: 1 mA.
Medium Air
Sensor material Platinum
Sensor dimensions 1 µm dia, 0.4 mm long
Sensor resistance R20 (approx.) 50 Ω
Temperature coefficient of resistance (TCR) α 20 (approx.) 0.35%/°C
Max. ambient temperature 150°C
Max. ambient pressure Depends on the type of mounting
Max. velocity 60 m/s
Frequency limit fcp (CCA mode)

2 kHz

Temperature Compensated, Miniature Wire Probe

This probe is intended for use in flows with slowly varying temperature fluctuations. It has a 5 µm diameter, 1.25 mm long tungsten wire sensor for velocity measurements and a 20 µm wire coil for temperature compensation. The coil follows the temperature variations and provides a constant overheat ratio, when operated in a 1:1 CTA bridge.

The probe body is a 2.3 mm diameter ceramic tubes, equipped with gold-plated connector pins that connect to the probe supports by means of plug-and-socket arrangements. Temperature compensated, miniature wire probes have marks (one and two dots) that indicate the sensor number.

Temperature compensated, miniature wire probe (wire+coil) (55P81)

The Temperature compensated miniature wire probe comes in one configuration, with straight prongs.

image of temperature compensated, miniature wire probe

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Mounting: 6 mm dia. probe supports.

Technical Data for wire sensors for temperature measurements

Medium Air
Sensor material Platinum
Sensor dimensions 1 µm dia, 0.4 mm long
Sensor resistance R20 (approx.) 50 Ω
Temperature coefficient of resistance (TCR) α 20 (approx.) 0.35%/°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 500 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.

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