K-Patents PR-23 - Page 58

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PR-23 instrucon manual
− First select 5 CALIBRATION in the Main menu and enter password if necessary.
Then select 2 OUTPUTS in the Calibration menu. In the Outputs menu, select 5 mA
OUTPUTS.
− Select the mA output, 1 or 2, to get to the Output menu (Figure 6.10 below) where
the output can be conigured.
Note: The line at the bottom of the Output menu display indicates the current
coniguration of the selected mA output, e.g. in Figure 6.10 mA Output 1 has been
conigured 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 Out-
put 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%, irst 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. The factory setting for default output is 3.4 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.