Table of Contents
Troubleshooting
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Summary of Contents for Hukseflux HTR02 Series
- Page 1 Hukseflux Thermal Sensors USER MANUAL HTR02 series Heater for calibration and verification of performance of FHF-type heat flux sensors Copyright by Hukseflux | HTR02 series manual v2203 |www.hukseflux.com| info@hukseflux.com...
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Page 2: Warning Statements
Warning statements Cautionary statements are subdivided into four categories: danger, warning, caution and notice according to the severity of the risk. DANGER Failure to comply with a danger statement will lead to death or serious physical injuries. WARNING Failure to comply with a warning statement may lead to risk of death or serious physical injuries. -
Page 3: Table Of Contents
A self-test for heat flux sensors Using heaters with FHF05 series Calibrating heat flux sensors An in-situ test for heat flux sensors Specifications of HTR02 series Specifications of HTR02 series Dimensions of HTR02 series Installation of HTR02 series Site selection and installation... -
Page 4: List Of Symbols
List of symbols Quantities Symbol Unit Heat flux Φ W/m² Voltage Sensitivity V/(W/m Temperature °C Thermal resistance per unit area K/(W/m²) thermal,A Area Electrical resistance Ω Electrical power Subscripts Property of heatsink heatsink Property of heater heater Property of sensor sensor Maximum value, specification limit maximum... -
Page 5: Introduction
Introduction HTR02 series are heaters that can be used for calibration and functionality checks of FHF- type heat flux sensors like FHF05 series. The heaters have a 4-wire connection with a known surface area and electrical resistance. Users can now easily and objectively check their sensor performance before and after use. - Page 6 HTR02 series is a foil heater and comes in two models. Either it can be used in combination with foil heat flux sensors such as FHF05 series for test and calibration purposes, or it can be used as a general-purpose heater.
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Page 7: Ordering And Checking At Delivery
Ordering and checking at delivery 1.1 Ordering HTR02 The standard configuration of HTR02 series is model 50X50 with 2 metres of cable, order code: HTR02-50X50-02. Common options are: model HTR02-85X85 • -05 or -10 metres cable length • • with a separate cable in 2, 5 or 10 metres cable length 1.2 Included items... -
Page 8: Quick Instrument Check
1.3 Quick instrument check A quick test of the instrument can be done by connecting it to a multimeter: 1. Check the heater serial number on the label at the end of HTR02’s cable against the product certificate provided with the heater. 2. -
Page 9: Instrument Principle And Theory
Instrument principle and theory HTR02 series is a foil heater. Either it can be used in combination with foil heat flux sensors such as FHF05 series for test and calibration purposes, or it can be used as a general-purpose heater. -
Page 10: Using Heaters With Fhf05 Series
Compatible compatible 2.3 Using heaters with FHF05 series HTR02 series is compatible with the models from the FHF05 series. Model FHF05-50X50 and -85X85 fit directly with HTR02-50X50 and -85X85 respectively. Models FHF05-10X10 and FHF05-15X30 fit with HTR02-50X50. Model FHF05-15X85 can be used with HTR02-85X85. - Page 11 Figure 2.3.2 Using HTR02 series heaters with FHF05 series. FHF05 models -10X10 ans - 15X30 are compatible with HTR02-50X50. Model FHF05-15X85 is compatible with HTR02- 85X85. We recommend making a guard around the sensor with equal thermal resistance and thickness. The orange-coloured part is the area where we recommend making a guard.
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Page 12: Calibrating Heat Flux Sensors
2.4 Calibrating heat flux sensors It is recommended to recalibrate heat flux sensors at least once every two years. HTR02 series can be used to calibrate heat flux sensors such as the models in the FHF05 series. In a typical calibration setup as shown in figure 2.4.1, a stack is made of a heatsink, the heat flux sensor to be calibrated, the heater and an insulating material. -
Page 13: An In-Situ Test For Heat Flux Sensors
The HTR02 series heater can be used to test the stable performance of the heat flux sensors such as FHF05 series. HTR02 series should be installed on top of the heat flux sensor, preferably on the side of the heat flux sensors with the more insulating medium. In case the heater is used for repeated verifications at one location, consider using our FHF05SC series: sensor with a HTR02 heater integrated. - Page 14 Figure 2.5.1 In-situ sensor stability check. Comparison of responses to stepwise heating relative to reference curves. Normalised to heater power (P) and relative to the heat flux and the temperature just before heating. Solid graphs show heat flux, dotted graphs show temperature.
- Page 15 Figure 2.5.3 In-situ sensor stability check. Comparison of responses to stepwise heating relative to reference curves. Normalised to heater power (P) and relative to the heat flux and the temperature just before heating. Solid graphs show heat flux, dotted graphs show temperature.
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Page 16: Specifications Of Htr02 Series
Specifications of HTR02 series 3.1 Specifications of HTR02 series HTR02 series is a heater with 4-wire connection with a known surface area and electrical resistance. It is designed for calibration and functionality checks of FHF-type sensors but can also be used for general heating purposes. - Page 17 Heater power supply 12 VDC (nominal) Power consumption at 12 VDC per dimension HTR02-50X50 1.20 W HTR02-85X85 3.60 W Nominal heat flux at 12 VDC per dimension HTR02-50X50 500 W/m² HTR02-85X85 500 W/m² INSTALLATION AND USE Recommended number of heaters one per sensor per measurement location Installation see recommendations in this user manual...
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Page 18: Dimensions Of Htr02 Series
3.2 Dimensions of HTR02 series Figure 3.2.1 Models HTR02 -50X50 and -85X85; Y1 = 47.6 or 82.6 and Y2=48 or 83, dimensions in x 10 heater area passive guard connection block for strain relief cable, standard length C = 2 m... -
Page 19: Installation Of Htr02 Series
Installation of HTR02 series 4.1 Site selection and installation Table 4.1.1 Recommendations for installation of HTR02 series. Surface cleaning and create a clean and smooth surface of at least the same outer dimensions levelling of the heater: (50 x 50) or (85 x 85) x 10... - Page 20 Figure 4.1.1 Installation of model HTR02-50X50 using tape to fixate the sensor and the connection block. Extra strain relief of the cable is provided using cable tie mounts equipped with double-sided tape as adhesive. As indicated in Table 4.1.1, tapes fixating the sensor are preferably taped over the passive guard area.
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Page 21: Electrical Connection
4.2 Electrical connection To apply a heat flux, HTR02 should be connected to a power supply. If a variable heat flux is required, the heater can either be connected via a solid-state relay controlled by a pulse-width modulated (PWM) signal or to a programable power supply (see figure 4.2.1). - Page 22 Figure 4.2.1 Suggested HTR02 heater wiring. Two heater wires are used to carry the heater current; the two others are used to measure the voltage over the heater. There is no significant current flowing though voltage measurement wires so that there is no voltage drop over these wires.
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Page 23: Maintenance And Trouble Shooting
Maintenance and trouble shooting 5.1 Recommended maintenance and quality assurance HTR02 series perform reliably at a low level of maintenance. Unreliable heater output can be detected by scientific judgement, for example by looking for unreasonably large or small measured values. The preferred way to ensure a reliable heater output, is a regular critical review of the measured data. -
Page 24: Trouble Shooting
5.2 Trouble shooting Table 5.2.1 Trouble shooting for HTR02 series. General Inspect the heater for any damage. Inspect the quality of mounting / installation. Inspect if the wires are properly attached to the data logger. Check the condition of the cable. -
Page 25: Appendices
Appendices 6.1 EU declaration of conformity Hukseflux Thermal Sensors B.V., Delftechpark 31, Delft, The Netherlands hereby declare under our sole responsibility that: Product model HTR02 series, all models Product type heater for calibration and verification of performance of FHF-type heat flux sensors... - Page 26 H TR 0 2 s e ri e s man u a l v 220 3 26/26...
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