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7.7.9 Math/logic
Function
Variable a
Variable b
Start
End
Humidity
Formula entry
Math symbols
and functions
Variables
IMAGO F3000 / 10.01
Four mathematical functions and eight logical formulae can be defined.
Math 1 — 4
Selection/settings
No function
Difference (a - b)
Ratio (a/b)
Humidity
Formula
(Analog selector)
Switched off
Measurement range restriction
-1999 to +9999
-1999 to +9999
k
/ bold = factory setting
A psychrometric humidity sensor is used to calculate the relative humidity, via
the mathematical combination of the wet and dry temperatures.
- The string for the formula consists of ASCII characters, and has a maximum
length of 70 characters.
- A formula can only be entered in the setup program.
- The formulae can be freely entered according to normal mathematical rules.
- Any number of space characters may be used within the formula character
string. No spaces are permitted within function designations, variable na-
mes or constants.
- The maximum calculation time must not be longer than 12 seconds. If this
time is exceeded, the setup program will generate an error message.
Priority
Math elements/functions
high
( )
SQRT, MIN, MAX, LOG, LN, SIN,
COS, TAN, ABS, EXP, INT, FRC
**
+, -
*, /
low
+, -
Variable name
Comment
E1 — E8
Analog input 1 to
XRF
Relative humidity
XKE
Core temperature
XC
X C-value
7 Setup Program
Description
Difference, ratio and humidity calculation
A formula can be entered in the line provided for
this purpose, or via the formula editor.
Variables for difference, ratio and humidity
calculation
An alarm message is generated if the result of the
calculation lies outside the restricted range of
measurement.
Comment
Brackets
Functions
Exponential (x
Sign
Multiplication, division
Addition, subtraction
nalog input 8
a
y
)
83
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