Lumel N31U - Alarm Output

25
N31U User manual
Failure to observe the above dependence will disable the individual characte-
ristic and set the error ag in the meter status register.
An example of the graphic interpretation of the individual characteristic is
shown in the Fig. 11.
The approximating functions strongly di󰀨er from the linear function, so it is
important to keep in mind that the higher the number of the introduced points,
the smaller the linearization error of the function.
The value for the measuring values smaller than X1 is converted according to
the rst linear function determined on the basis of the points (X1, Y1) and (X2,
Y2). Similarly, the conversion for the measured values higher than the last
entered point is made using the last selected function.
5.4.2 Alarm output
N31U meters are equipped with one alarm output as standard. The alarm output
element is an electromagnetic transmitter.
Alarm output is independently congured and can be congured to work in one of
six modes. It is possible to select the value controlling the alarm (see Fig. 9), dene
the alarm state change thresholds and dene delays alarm activation and deacti-
vation for each of the alarms. Fig. 12 shows how the alarms work in n-on, n-o󰀨,
o󰀨 and on modes. Additional manual working modes H-on and H-oFF enable to
permanently activate or deactivate the alarms. An additional REG operation mode
has also been added to the alarm type settings. In this mode, the alarm status is
controlled via the RS-485 interface by MODBUS protocol registers.
Fig. 11: Example of the individual characteristic.
Measuring value
Expected value