46
PR-23 instruction manual
6.2.7 Hold functions with DD-23
The 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 Configuring 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 as-
signed to either sensor A or sensor B.
6.3.1 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
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
NOT DEFINED
Factory setting.
2
NORMAL OPERATION
Closed contact if diagnostic message is
NORMAL OPERA-
TION
during
HOLD
(see Section 6.3.2). The contact is also
closed when message is
NO SAMPLE
.
Summary of Contents for K-PATENTS PR-23 AX Series
Page 1: ...IM EN PR23 v 2 00 Instruction Manual Vaisala K PATENTS Process Refractometer PR 23...
Page 2: ......
Page 4: ......
Page 17: ...2 Inline refractometer sensor 7 2 2 2 PR 23 mounting guide...
Page 26: ...16 PR 23 instruction manual...
Page 29: ...4 Prism wash systems 19 Figure 4 1 A prism wash system for steam non sanitary...
Page 30: ...20 PR 23 instruction manual Figure 4 2 A sanitary prism wash system for steam...
Page 32: ...22 PR 23 instruction manual Figure 4 5 Wiring for a prism wash system for steam...
Page 33: ...4 Prism wash systems 23 Figure 4 6 A prism wash system for high pressure water non sanitary...
Page 34: ...24 PR 23 instruction manual Figure 4 7 A sanitary prism wash system for high pressure water...
Page 35: ...4 Prism wash systems 25 Figure 4 8 Wiring for a prism wash system for high pressure water...
Page 40: ...30 PR 23 instruction manual...
Page 50: ...40 PR 23 instruction manual...
Page 72: ...62 PR 23 instruction manual...
Page 174: ...164 PR 23 instruction manual...
Page 179: ...11 Safe Drive 169 11 3 3 Safe Drive steam wash system parts...
Page 186: ...176 PR 23 instruction manual 11 4 2 Wiring Figure 11 9 PR 23 SD system wiring...
Page 204: ...194 PR 23 instruction manual Figure 11 19 Markings on the retractor handle...
Page 206: ...196 PR 23 instruction manual...
Page 218: ...208 PR 23 instruction manual...
Page 226: ...216 PR 23 instruction manual...
Page 230: ...220 PR 23 instruction manual...
Page 232: ...222...
Page 238: ...228...
Page 240: ...230...
Page 242: ...232...
Page 244: ...234...
Page 246: ...www vaisala com...
