These special thermocouples are ideal for very fast measurements of temperature changes on the surface of a body. These sensors are ideal for measurements during a short individual event. In the latter case, these measurements can be used to calculate heat flows into the surface. From the signal of the surface temperature change, the convective heat flow into the wall can be determined. The thermocouple is regarded as a half-infinite- body. The max. measuring time ends when the rear part of the sensor also starts to warm up after approx. 40 to 100 ms since then the calculation basis are lost.
To calculate the heat flow we offer the program Heat Flux Calculator HFC. It calculates the heat flow in a simple manner using the temperature and material data of the sensor.
The sensor is small enough to accommodate in each contour e.g. in a wing nose of a space shuttle. In addition, its sensitive end can be completely inserted into the surface by filing and grinding. Alternatively, the end of the probe can be coated with a finished metal coating. This offers the advantage of a longer service life at higher temperatures, but has the disadvantage of a fixed geometry.
Heat flux sensor MCT 19, 36 and MCTB 48 with bore hole for central pressure measurement. Alternative design with thread and /or short cable for easy screwing
The model MCTB 48 also offers the unique possibility by coaxially installing a pressure probe to measure changes of pressure at one and the same position as the temperature as well. Our pressure probe M60-1LM3 can be screwed into the thermocouple with its thread.
If the experiments take place at constantly high temperatures, the surface begins to corrode after some time and the signal disappears. The duration of the measurement for type E is about 35 minutes at temperatures of 615 °C and about 8 minutes at 715 °C. In these cases, the thermocouple can be refurbished by re-grinding the sensor surface. This gives them almost unlimited durabi
Type of thermocouple:
Type E (Type K as a special design)
Chromel - Constantan, coaxial
Type E: - 200 to 900 °C
Type K: - 200 to 1170°C
20 KW/m² to 20 MW/m²
√ ρ c k:
About 9000 W √s/m²K
1.9, 3.6 and 4.8 mm
MCT 19: d = 1.9 x 26 mm
MCT 36: d = 3.6 mm x 17 mm
MCTB 48: d = 4.8 x 25 mm
Special version with bore hole for pressure measurement, diameter for adjustment between 1-3 mm
About 60 µV/K for type E, 39.9 µV/K for type K , (s. IEC-584 T1)
Calibrated by the University of Aachen
Can be individually shaped by the user
For the thermocouple MCTB 48 a coaxial borehole with d = 0.8 mm for connecting a pressure probe with a diameter of 1.9 to 3 mm is possible (e.g. M60-1L-M3)
Via 2 m temperature resistance coaxial cable with BNC pos.
Amplifier is needed. We recommend our MVA 10 plus 1 MHz filter
Article 100-001-0: HFC Heat Flux Calculator program
Article-No. 100-001-1: MCT 19, type E, diameter 1.9 mm
Article-No. 100-001-2: MCT 36, type E, diameter 3.6 mm
Article-No. 100-001-3: MCTB 48, diameter 4.8 mm
Article-No. 100-001-6: Surcharge for metallic surface
Article-No. 100-001-7: Surcharge for a short 20 cm cable plus connection to a 2 m extension cable with BNC pos. for sensor with screw for easy screwing
Article 100-001-8: Surcharge for thread for easier mount, M2, M3.5 and M5 with counter nut
Article 100-001-9: Surcharge for type K instead of type E
Heat Flux Detection at a Model of Space Shuttle Hermes [PDF, 157 KB]
Thin Film Gauges and Coaxial Thermocouples for Measuring Transient Temperatures
Olivier H., Grönig H.:
Instrumentation Technique of Aachen Shock Wave Tunnel - ICIASF 1995a3
The Validation of the Explosive Fumes Dynamics in Rooms
Sensitivity of the Coaxial Thermocouple MCT:
corresponding to IEC 584 T1 for Type E