HFS Heat Flux Sensor Instruction Manual
2
3
Directive Compliances
RoHS Compliance
9
REACH Compliance
10
CE Compliance
11
List of Symbols Used in this Manual
Term Represented by
Symbol
Symbol
English Units
Metric / SI
Units
Heat Flux
q”
BTU/(ft
2
-hr)
W/m
2
Electrical Resistance
Ω
Ohms or kOhms
Voltage Output
ΔV
V or mV or µV
Heat Flux Sensor Sensitivity
S
µV / BTU/(ft
2
-hr)
µV/(W/m
2
)
Temperature
T
°F
°C
Temperature Difference
ΔT
°F
°C
Heat Flux Sensor Sensitivity
at a Temperature
S
@ T
°C
µV / BTU/(ft
2
-hr)
µV/(W/m
2
)
Sensitivity Multiplication
Factor
M.F.
No Units
Temperature Gradient
dT/dx
°F/ft
°C/m
Thickness of Material
δ
ft
m
Thermal Conductivity
λ or k
BTU/(ft
2
-hr)/°F
W/(m-K)
Thermal Resistance
R”
°F/BTU/(ft
2
-hr)
(m
2
-K)/W
Unit Conversion Factors
Term
Conversion Method
Heat Flux
1 W/m
2
= 0.317 BTU/ft
2
-hr
Sensor Sensitivity
1 µV/(W/m
2
) = 3.155 µV/(BTU/(ft
2
-hr)
1 µV/(W/m
2
) = 10 mV/(W/cm
2
)
