Hach ORBISPHERE K-M1100 User Manual page 69

Inputs/Outputs Menu
Analog outputs
There are three analog outputs available. These outputs are configurable in terms of function, content,
and behavior through the instrument menus. Analog outputs are used to output a current which is a
function (e.g. a linear characteristic) of a measurement: AOut = f (M). The analog outputs can be
typically connected to a PLC. Knowing the function (f), the PLC can compute the value of the
measurement.
Instrument
configuration
Standard event
indication
Extended event
indication
Gas concentration
Temperature
68
•
•
For some events (sensor out, purge failure, etc.) the actual measurement is
not significant, but the PLC needs to know how the analog output behaves
in these cases. Two "Event indication modes" are available:
•
•
Refer to
The "Extended event indication" mode is only available when the 4-20 mA
output is selected. In this mode, the range between 0 mA and 4 mA is used
to indicate selected events. The events are defined using the channel
configuration option. Refer to
Table 1 Standard event indication
Event output range
Analog output
0-20 mA
20 mA
20 mA
Select analog output range of current:
4-20 mA or 0-20 mA
The 4-20 mA range (recommended) allows for an extended event
indication mode that can be selected and configured (default = standard
mode)
Standard mode (default)
Extended mode
Table 1 Standard event indication
Channel configuration on page
4-20 mA
• Channel out
• Sensor out
20 mA
• Thermal cut-off
• Interfering gas error
• Channel out
20 mA
• Sensor out
below.
69.
Event