Hanna Instruments PCA 310 - Manual (Page 35)

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READ ON DEMAND
When this function is selected, (“General Menu” - “System
Functions” - “Manual commands” - “Read On Demand”) a
new chlorine measuring cycle is immediately started.
This command is useful when calibrate or whenever an imme-
diate result is needed.
Note: The read on demand function is active only when the analyzer
is in automatic mode.
DIRECT READ
For rapid diagnostics of the measuring cell, the converter read-
ings for dark (cell LED off) and blank (cell LED on) could be
consulted.
To display the dark reading activate the “General Menu” -
“System Functions” - “Dark Read” function. After confirma-
tion the dark value is displayed.
To display the blank reading activate the “General Menu” -
“System Functions” - “Blank Read” function. After confirma-
tion the blank value is displayed.
If the cell work correctly, the values must be between -20000
and 20000 with a minimum difference blank – dark of 20000
converter points.
SYSTEM ERROR RELAY
The PCA 320-330 controller has a single system error relay
for all measured parameters.
To allow chlorine errors to activate the relay, set “Chlorine
Menu” - “Alarm&Err Chlorine” - “Err.Relay” to Active.
For pH errors set the item “pH Menu” - “Alarms&Err pH” -
“Err. Relay” to Active.
For ORP errors set the item “ORP Menu” - “Alarms&Err ORP”
- “Err. Relay” to Active.
For temperature errors set the item “Temperature Menu” -
“Alarms&Err Temp.” - “Err. Relay” to Active.
Manual Commands
Dark Read
Blank Read
Change Pass: 0000