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Device Functions Proline Promag 55
7 Block OUTPUTS
Hauser
59
VALUE 0_4 mA
(4002)
Use this function to assign the 0/4 mA current a value. The value can be higher or lower
than the value assigned to 20 mA (function VALUE 20 mA (4003)). Positive and negative
values are permissible, depending on the measured variable in question (e.g. volume
flow).
Example:
4 mA assigned value = –250 l/h
20 mA assigned value = +750 l/h
Calculated current value = 8 mA (at zero flow)
Note that values with different signs cannot be entered for 0/4 mA and 20 mA (function
4003) if SYMMETRY is the setting selected for the MEASURING MODE function (4004).
In this case the message "INPUT RANGE EXCEEDED" appears on the display.
Example for STANDARD measuring mode:
A0001223
➀
= Initial value (0 to 20 mA)
➁
= Lower signal on alarm level: depends on the setting in the function CURRENT SPAN
➂
= Initial value (4 to 20 mA): depends on the setting in the function CURRENT SPAN
➃
= Full scale value (0/4 to 20 mA): depends on the setting in the function CURRENT SPAN
➄
= Maximum current value: depends on the setting in the function CURRENT SPAN
➅
= Failsafe mode (upper signal on alarm level): depends on the setting in the functions CURRENT
SPAN (s. Page 58) and FAILSAFE MODE, (s. Page 65)
A = Measuring range (the minimum measuring range has to exceed the value that correlates with a
flow velocity of 0.3 m/s)
User input:
5-digit floating-point number, with sign
Factory setting:
0 [unit]
!
Note!
• The appropriate unit is taken from the function UNIT VOLUME FLOW (0402) or
UNIT MASS FLOW (0400), (see Page 16 or Page 15).
• When conductivity is selected the value 0_4 mA must be equal or >0.
"
Caution!
The current output responds differently, depending on the parameters set in the various
functions. Some examples of parameter settings and their effect on the current output are
given in the following section.
(continued on next page)
Function description
OUTPUTS
➞
CURRENT OUTPUT (1 to 2)
➞
CONFIGURATION
0
3
4
5
6
I [mA]
2
A
1
Q
Содержание Proline Promag 55
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