Stratos Multi E401N
201
13.4.2 Current Characteristic (FW-E006)
The FW-E006 add-on function must be activated in the device with a TAN for the specifiable current
characteristic. ➜
Option Activation, p. 47
Assignment of output current to process variables in 1-mA increments.
Settings can be changed in:
Parameter Setting
Inputs and Outputs
Current Outputs
01. Open the Current Output I1 or Current Output I2 submenus.
02. Usage: On
03. Select the process variable.
04. Characteristic: Table
✓ The Table submenu is displayed.
05. Open the Table submenu.
06. Enter process variable values.
The entered values must be continuously rising or falling.
13.4.3 Concentration Determination (FW-E009)
The FW-E009 add-on function must be activated in the device with a TAN for the concentration deter-
mination. ➜
Option Activation, p. 47
The substance concentration in percent by weight (wt%) is determined for H
2
SO
4
, HNO
3
, HCl, NaOH,
NaCl, and Oleum.
Conditions for Concentration Determination
The following pages present the conductivity curves depending on substance concentration and
medium temperature.
The following conditions must be met for a reliable concentration determination:
• For calculation of concentration, the medium to be measured must be a purely binary mixture
(e.g. water-hydrochloric acid). Presence of other dissolved substances (e.g. salts) leads to incorrect
concentration values.
• In the region of small slopes (e.g. at the range limits) small changes in conductivity can correspond
to large changes in concentration. This may lead to an unsteady display of the concentration value.
• As the concentration value is calculated from the measured conductivity and temperature values,
accurate temperature measurement is very important. Therefore, you should make sure that
conductivity sensor and process medium are in thermal equilibrium.
Settings can be changed in the Concentration submenu:
Parameter Setting
[I] [II] … Cond(I)
Concentration
01. Concentration: On
02. Select the medium.
You can define limits for warning and failure messages for the concentration value:
Parameter Setting
[I] [II] … Cond(I)
Messages
Concentration Messages ➜ Messages, p. 82
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