EN
8.1.2 Flow Value via the Analog Interface
The internal software of the BioProTT
TM
FlowMCP-a
maps the flow value from the flow value set at 4 mA
to the flow value set at 20 mA (both can be set on the
web interface) linearly to 4 mA - 20 mA. The current
output of the flow value can be read as follows:
•
0 mA indicates a broken cable, circuit, or power
leakage
•
currents of 0.5 mA indicate invalid flow conditions
such as, e.g. low coupling or an error condition
like an invalid sensor or a sensor that has not
yet been recognized (for more information, refer
to chapter 10 "Troubleshooting").
•
the value for the range between 1 mA to <4 mA
depends on the value set for 4 mA on the web
interface (see no. 15 in chapter 6.4.2 "Set-Up
Page of the BioProTT
TM
FlowMCP-a") as the graph
(compare Figure 23) is a linear continuation of
the graph between 4 mA to 20 mA.
Please note:
This means, that the flow value within the range of 1 mA to <4 mA can also be negative in case the flow value
at 4 mA was set to "0".
•
4 mA equals the flow value set for the parameter " flow value at 4 mA" on the web interface
•
20 mA equals the flow value set for the parameter " flow value at 20 mA" on the web interface
The default settings for "flow value at 4 mA" and "flow value at 20 mA" upon first connecting a sensor are:
•
0 for "flow value at 4 mA"
•
Qmax of the connected sensor for "flow value at 20 mA"
When another sensor is connected to the flow channel for the first time, the Qmax of the new sensor is used
as "flow value at 20 mA".
It is possible to store the settings for "flow value at 4 mA" and "flow value at 20 mA" for a total of 16 different
sensors on the BioProTT
TM
FlowMCP.
Figure 21: Flow chart flow on analog output
BioProTT™ FlowMCP
Page 50
Copyright em-tec GmbH
D214-703 BioProTT™FlowMCP – User Manual – V4.0
