K-Patents PR-23 - Manual (Page 54)

46 PR-23 instruction manual
Note: The line at the bottom of the Output menu display indicates the current
configuration of the selected mA output, e.g. in Figure 6.10 mA Output 1 has been
configured to send the concentration reading of Sensor B.
Figure 6.10 The Output menu for mA Output 1
− To change the sensor the selected output is assigned to, select
1 SENSOR in the Output
menu.
− To change output source for the selected output, select
2 SOURCE .
Note: Selecting 1 NOT DEFINED ’turns off’ the selected output.
− The
3 ZERO value sets the value when the signal is 4 mA. The default zero value is
0.00, the unit depends on the source and display unit set for the sensor in question
(and can thus be for example 0 BRIX or 0 °F).
− The
4 SPAN sets the range, i.e. the value given when the signal is 20 mA.
Example: If your measurement unit is CONC% and you want to measure the range
15–25 CONC%, first choose concentration as mA output source. Then set the zero
value at 15 and span at 10. This means that the output signal is 4 mA at 15 CONC% and
20 mA at 15+10=25 CONC%. To change this output to range 10–30 CONC%, change
zero to 10 and span to 20 (10+20=30).
−
5 DEFAULT OUTPUT sets a mA default output value that the instrument returns to in
certain malfunction situations. The value can be set to a low or high mA value, e.g.
3.0 mA or 22 mA. For a list of malfunctions that are affected, see section 8.4.
Note: NAMUR is an international association of users of automation in process in-
dustries. The association recommendation NE 43 promotes a standardization of the
signal level for failure information. The goal of NE 43 is to set a basis for proactively
using transmitter failure signals in process control strategies. Using these failure sig-
nals, instrument faults are separated from process measurements.