IMAGO F3000 / 10.01 83
7 Setup Program
7.7.9 Math/logic
Four mathematical functions and eight logical formulae can be defined.
Math 1 — 4
Humidity
A psychrometric humidity sensor is used to calculate the relative humidity, via
the mathematical combination of the wet and dry temperatures.
Formula entry
- 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.
Math symbols
and functions
Variables
Selection/settings Description
Function
No function Difference, ratio and humidity calculation
A formula can be entered in the line provided for
this purpose, or via the formula editor.
Difference (a - b)
Ratio (a/b)
Humidity
Formula
Variable a
Variable b
(Analog selector) Variables for difference, ratio and humidity
calculation
Switched off
Measurement range restriction
Start -1999 to +9999 An alarm message is generated if the result of the
calculation lies outside the restricted range of
measurement.
End -1999 to +9999
k / bold = factory setting
Priority Math elements/functions
Comment
high ( )
Brackets
SQRT, MIN, MAX, LOG, LN, SIN,
COS, TAN, ABS, EXP, INT, FRC
Functions
**
Exponential (x
y
)
+, -
Sign
*, /
Multiplication, division
low +, -
Addition, subtraction
Variable name
Comment
E1 — E8
Analog input 1 to
a
nalog input 8
XRF
Relative humidity
XKE
Core temperature
XC
X C-value
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