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PR-23 instrucon manual
6.2.7 Hold funcons with DD-23
The K-Patents Digital Divert Control System DD-23 uses the displayed concentration
value in its decision logic. Due to this, the external hold functionality must not be
used with a DD-23, as it could potentially render the system unsafe by freezing the
measurement result.
The "hold during wash" must be used with DD-23. Otherwise the signal damping com-
bined with low nD values caused by the wash process may give erroneous information
to the DD-23 after the wash is over.
The selection of tolerance time with DD-23 requires a careful risk analysis. The use of
the tolerance time functionality does not slow down the response of the instrument
when the instrument is in NORMAL OPERATION. It does, however, slow down the mal-
function alarm in the DD-23 in case the process pipe becomes empty or some other
reason makes the optical image impossible to interpret. The recommended value for
tolerance time is 5 seconds when a DTR is used in a DD-23 system.
6.3 Conguring refractometer system
The Indicating transmitter has two built-in 4–20 mA outputs (mA OUTPUT 1, mA
OUTPUT 2), two relay contact outputs (RELAY 1, RELAY 2), and four switch inputs
(SWITCH 1,
SWITCH 2, SWITCH 3, SWITCH 4). Each of these resources can be freely assigned to either
sensor A or sensor B.
6.3.1 Conguring relays
For the electrical properties of the built-in relays, see Section 3.3.3. Each of the two
relays can be conigured individually to either Sensor A or Sensor B, i.e. 0–2 relays can
be assigned to a sensor. Relays can also be opened and closed manually, mainly to test
them.
To conigure the relays, follow the instructions below:
1. Select 5 CALIBRATION from the Main menu.
2. Select 3 RELAYS from the Calibration menu.
3. Select the relay, either 1 RELAY 1 or 2 RELAY 2, to be conigured.
4. In the Relay menu (see Figure 6.6) select 1 SENSOR to assign the current relay to
either Sensor A or Sensor B.
Note: The current assignment of the relay is shown at the bottom of the Re-
lay menu display, e.g. Figure 6.6 Relay 1 is assigned to Sensor A with function
Low limit.
5. In the relay menu, select 2 FUNCTION to set the relay function:
1 FUNCTION NOT DEFINED Factory setting.
2 FUNCTION NORMAL OPERATION Closed contact if diagnostic message is NORMAL
OPERATION during HOLD (see Section 6.3.2). The
contact is also closed when message is NO SAMPLE.
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