FMC Technologies Proline Promass 83 E - Function Description

Issue/Rev. 0.2 (12/12) MN0M023 • Page 65
Device Functions Proline Promass 83 7 Block OUTPUTS
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), see page 67). Positive and negative values are permissible, depending on the
measured variable in question (e.g. mass flow).
Example:
4 mA assigned value = - 250 kg/h
20 mA assigned value = +750 kg/h
Calculated current value = 8 mA (at zero flow)
! Note!
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
m = Initial value (0 to 20 mA)
n = Lower signal on alarm level: depends on the setting in the function CURRENT SPAN
o= Initial value (4 to 20 mA): depends on the setting in the function CURRENT SPAN
p= Full scale value (0/4 to 20 mA): depends on the setting in the function CURRENT SPAN
q= Maximum current value: depends on the setting in the function CURRENT SPAN
r= Failsafe mode (upper signal on alarm level): depends on the setting in the functions
CURRENT SPAN (page 64) and FAILSAFE MODE, (page 60)
A = Measuring range
User input:
5-digit floating-point number, with sign
Factory setting:
0 [kg/h] or 0.5 [kg/l] or –50 [°C]
! Note!
• The appropriate unit is taken from the following functions:
– UNIT MASS FLOW (0400)
– UNIT VOLUME FLOW (0402)
– UNIT CORRECTED VOLUME FLOW (0404)
– UNIT DENSITY (0420)
– UNIT REFERENCE DENSITY (0421)
– UNIT TEMPERATURE (0422)
(see page 17 till page 21).
• If the option BATCH UPWARDS or BATCH DOWNWARDS (only possible with the
optional software package BATCHING) is selected in the function ASSIGN CURRENT
OUTPUT (4000), the value 0/4 mA is automatically specified in this function and
cannot be edited.
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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.
Function description
OUTPUTS o CURRENT OUTPUT (1...3) o CONFIGURATION
0
3
4
5
6
I [mA]
2
A
1
Q