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HFS Heat Flux Sensor Instruction Manual
Introduction
Heat flux sensors can be used to measure and quantify the thermal energy per unit area
moving through a surface of a system and can measure heat transfer in HVAC systems,
insulation analysis, refrigeration systems as well as countless other thermal applications.
Heat Flux Sensor Description
The HFS-5, HFS-6, & UHFS-09 heat flux sensors utilize a differential-temperature
thermopile design to measure the movement of thermal energy per unit area, or heat flux,
through the sensor surface. Each HFS sensor includes an integrated type-T thermocouple
that can be used for sensor temperature measurements. The sensitivity of each sensor
is provided with each unit recorded on their respective calibration certificate. Sensor
calibration procedures adhere to ASTM standard C1130 and are described later in this
manual.
Instruction Manual Contents
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HFS - 5 HFS - 6 UHFS - 09
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Related Manuals for Omega HFS-5
Summary of Contents for Omega HFS-5
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Page 1: Table Of Contents
Heat Flux Sensor Description The HFS-5, HFS-6, & UHFS-09 heat flux sensors utilize a differential-temperature thermopile design to measure the movement of thermal energy per unit area, or heat flux, through the sensor surface. - Page 2 HFS Heat Flux Sensor Instruction Manual Directive Compliances RoHS Compliance REACH Compliance CE Compliance List of Symbols Used in this Manual Term Represented by Metric / SI Symbol English Units Symbol Units q” Heat Flux BTU/(ft -hr) Ω Electrical Resistance Ohms or kOhms ΔV Voltage Output...
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Page 3: How To Use A Heat Flux Sensor
HFS Heat Flux Sensor Instruction Manual Section 1: How to Use a Heat Flux Sensor Below are details on how to use a heat flux sensor to take thermal measurements. These directions are for general use and can be somewhat modified depending on the test conditions in order to collect the most accurate measurements for your application. -
Page 4: Measuring Thermocouple Voltage
Connect an ohmmeter to the bright red wire and the white wire leads to check the heat flux sensor’s electrical resistance. It should <1000 Ω for HFS-5 sensors or <5 kΩ for HFS-6 & UHFS-09 sensors. If the resistance is much larger than this then there may be an issue with the sensor. - Page 5 HFS Heat Flux Sensor Instruction Manual Check the Output Voltage for an Induced Heat Flux Through Sensor: A simple method of determining whether the HFS is roughly operating correctly is by physically inducing a heat flux. Place the HFS sensor on a metallic surface and firmly placing the palm of your hand across the entire sensor surface.
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Page 6: Sensor Mounting/Installation
(Suggested meter: Omega DP41-TC) Temperature Dependence of HFS Heat Flux Sensor The output signals from HFS-5 and HFS-6 heat flux sensors have some dependence on the temperature of the sensor itself. This dependence means that sensor’s sensitivity changes slightly at different temperatures. UHFS-09 sensors do not experience this dependence so ignore this section if using this sensor model. -
Page 7: Calculating Heat Flux
HFS Heat Flux Sensor Instruction Manual Take the sensor’s temperature measurement, T , at each measurement in time °C along with the calibrated sensitivity, S , to determine the heat flux sensitivity at that Calib specific temperature, S °C �� = ��. -
Page 8: Heat Flux Sensor Sensitivity Determination
HFS Heat Flux Sensor Instruction Manual 2. Next, calculate heat flux using the adjusted sensitivity and voltage measurement across the heat flux wire leads. It should be noted that both positive and negative voltages can be measured by the HFS sensor. - Page 9 All HFS-5, HFS-6, & UHFS-09 heat flux sensor products will have the following RoHS3 Compliance:...
- Page 10 The directive defines substances which are to be restricted. The REACH candidate list of Substances of Very High Concern (SVHC) found at: http://echa.europa.eu/chem_data/authorisation_process/candidate_list_table_en.asp All HFS-5, HFS-6, & UHFS-09 heat flux sensor products will have the following REACH Compliance. REACH Status: Compliant The REACH Compliance of any product so designated is based upon evidence from the producer (manufacturer) that the part number is in compliance with the REACH Directive.
- Page 11 We declare that the DoC is issued under the sole responsibility and belongs to the following product: Objects of the Declaration Product Model Number: HFS-5 & HFS-6 & UHFS-09 The object of the declaration described above is in conformity with the relevant Union harmonization legislation:...