Simex SRP-147, Руководство пользователя

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User manual - METER SRP-147
Figure 7.3 E xample of definition of permissible range of input signal -
“ Lo r ” and “ Hi r ” parameters ( “4-20” mode)
The “Lo r” parameter is important if input is set to “4-20” , “1-5” or “2-10” mode
only, and determines lower border of the permissible range. If input is set to
“0-20” , “0-5” or “0-10” mode then lower border of the permissible range is
always 0.
For example if input is set to
“4-20”
mode, then lower border is calculated due to
expression: I
min
= 4 mA - 4 mA ×
“Lo r”
%.
The “Lo r” value can be set from 0 to 99.9%.
Parameter “Hi r” determines the upper border of the permissible range accordingly
to the expression (for all modes).
For example if input is set to
“4-20” mode, then upper border is calculated due to
expression: I
max
= 20 mA + 20 mA ×
“Hi r”
%.
The value of
“Hi r”
can be set from 0 to 19.9%
In example no 1 of the DISPLAY VALUES CALCULATION paragraph the
procedure of the permissible input range determining is presented in details.
If the measurement value does not exceed permissible measurement range but
displayed value exceeds range -999 ÷ 9999, the warning
”-Ov-”
is displayed rather
than the calculated result.
34
” Lo r ” = 75,0% (3 mA)
” Hi r ” = 5,0 % (1 mA)
4 21
permissible measurement range
measurement result is displayed
regardless on nominal range exceeding
nominal measurement range (4-20mA)
[mA]
20 22
1
0
I
min
I
max
display
message ”
-Lo- ”
display
message ”
-Hi- ”
i