Simex SRT-94-XA, Руководство пользователя

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User manual - METER SRT-94-XA
7.3.4. ”OutP” menu
This menu contains parameters of current output control. Menu is available if the device
is equipped witch current output.
Current output can be controlled depend on both present measured value and peak
value (if peak detection is enabled).
“Omod” - current output mode, can be set to values:
” oFF ” - current output disabled ,
” 0-20 ” - current output enabled with 0 ÷ 20 mA mode ,
“ 4-20 ”
- current output enabled with 4 ÷ 20 mA mode,
” modb ” - current output controlled via RS-485 interface.
”OUtL”
- this parameter determines the input value for which the output current is minimal
(0 mA or 4 mA depend of current output mode „
Omod
”).
“OUtH” - this parameter determines the input value for which the output current is equal
20mA.
The output current value is calculated due to formulas given below:
I
out
=
W − " OUtL"
"OUtH" − "OUtL"
× 16 mA  4 mA for output range 4 ÷ 20 mA
I
out
=
W − "OUtL"
"OUtH" − "OUtL"
× 20 mA for output range 0 ÷ 20 mA
where “
W
” denotes the displayed value.
“ OutL ” parameter can be greater than “ OutH ”. In this case the conversion
characteristic is reversed, it means that if input value raises the output current falls.
” Lo r ”, ” Hi r ” - this parameters define the output current range (maximum range 0 to 24 mA).
If calculated output value I
out
exceeds defined range then current output
generates the current equal to upper or lower border of the defined range. The
parameters define the percentage extension of nominal current range 4-20 mA
(with 0,1% resolution).
Parameter “ Lo r ” defines lower border of the range due to formula:
I
min
= 4 mA - 4 mA × “ Lo r ” %.
This parameter can be set from 0 to 99.9%.
Parameter “Hi r” defines lower border of the range due to formula:
I
max
= 20 mA + 20 mA × “
Hi r
” %.
This parameter can be set from 0 to 19.9%.
In example on page 31 of the DISPLAY VALUES CALCULATION paragraph
the procedure of the current outputs determining is presented in details.
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