K-Patents PR-23 - Manual (Page 50)

42 PR-23 instruction manual
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 malfunc-
tion 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 toler-
ance time is 5 seconds when a DTR is used in a DD-23 system.
6.3 Configuring relays
For the electrical properties of the built-in relays, see Section 3.3.3. Each of the two
relays can be configured 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 configure 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 configured.
4. In the Relay menu (see Figure 6.6) select 1 SENSOR to assign the current relay to ei-
ther 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.
Figure 6.6 Relay menu for Relay 1
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 6.4).
The contact is also closed when message
is
NO SAMPLE .
3 FUNCTION INSTRUMENT OK Closed contact if there is no equipment
malfunction.