Configuring Ma Outputs - Vaisala PR-23 Series User Manual

PR-23 Series User Guide
4. To set the switch function, select Switch > 2 FUNCTION.
The current assignment of the switch is shown at the bottom of the Switch menu
display. For example, in the previous figure, switch 1 is assigned to sensor A with
function Wash stop.
Function name
1 NOT DEFINED
2 HOLD
3 WASH STOP
4 REMOTE WASH
5 SCALE SELECT
6 CALIBRATION SEAL
5. If you chose SCALE SELECT as switch function, select Switch > 3 SCALE CHEMICAL to
enter the parameters for the chemical curve assigned to the switch. For more
information on chemical curves and chemical curve parameters, see
(page 74).
6. If necessary, the chemical curve assigned to a switch can be adjusted by field
calibration parameters. Select Switch > 4 SCALE FIELD to enter the parameters. For
more information on field calibration and field calibration parameters, see
calibration (page
7.3.3 Configuring mA outputs
For the electrical properties of the two output signals, see
(page 27).
70
75).
Description
Factory setting.
When used with a built-in wash relay, this
function is useful for an intermittent
process: the prism is washed when the
process stops (as indicated by contact
closure). The wash is repeated when the
process restarts (if the stop lasts over 60 s).
The signal is on hold between
washes.When used with an external
independent timer, contact closure holds
the output signal.
Switch closure prevents wash cycle. It can
be used to prevent wash action when the
process pipe is empty. The message WASH
STOP displays when a wash cycle is
initiated.
At switch closure the system waits for an
external wash command before initiating
wash.
Any chemical curve and associated field
calibration scale can be selected by switch
closure. The scales assigned to each switch
independently.
Contact closure prevents access to
calibration and configuration ("external
password"). Can be used to seal the
calibration.
Chemical curve
Connecting indicating transmitter
IM-EN-PR23-E
Field