Section 9. Theory of operation
9-7
RH (%) is then computed from
y
with a 3rd order poly-
nomial
9-14a
9-14b
where
a
x
,
b
x
,
c
x
and
d
x
are factory-determined coefficients
for each RH sensor.
Matching RH sensors
The above equations describe calculations for the RH
sensors. Any offset between the two sensors must be
accounted for by matching them.
9-15
9-16
Flow sensors
Converting flow sensor voltage to a flow rate (µmol s
-1
)
requires 4 factory-determined coefficients and a zero and
span setting for each flow sensor.
9-17a
9-17b
where subscript
In
or
Out
are for the flow sensors enter-
ing and exiting the cuvette, respectively,
V
flowX
is the
sensor voltage,
Z
flowX
is the user-settable sensor zero
(nominally 0.6),
S
flowX
is the user-settable span (nom-
inally 1.0).
Flow (µmol s
-1
) is then computed from
y
with a 4th
order polynomial
Summary of Contents for LI-600
Page 1: ...Using the Ll 600 Porometer Fluorometer Instruction Manual ...
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Page 69: ...7 8 ...
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