Process Errors - Hanna Instruments BL120 Instruction Manual

Note: The logging period is higher than the measure period. Any alarm condition that occurred between logging moments
is captured and logged even if the alarm conditions are no longer active on first log (event) after the alarm.
Any alarm condition will inactivate the dosing pumps. During an alarm condition:
• An  (High alarm)  (Low alarm) icon will appear close to parameter value which triggered the alarm.
• STATUS LED will turn RED and start blinking.
• SERVICE LED will start blinking.
• The regulator pump status LEDs will be Off.
• The ALARM message is displayed close to the pump icon.
• Help on measurement screens will display the active alarms.

9.3. PROCESS ERRORS

Process errors are errors that could occur during process and may affect the pH control, ORP control or both.
Possible events:
• No probe – triggered if probe is disconnected.
• Hold input active (the recirculation pump doesn't work) – triggered only if Hold input is enabled.
• Remote Hold (Deactivate the pumps,
check box in General Settings tab. After it has been triggered, a notiffication message will appear on LCD. The remote hold
can be canceled immediately by pressing YES, or later, by pressing R-HOLD available in "Menu\Hanna Cloud Option".
• pH out of range – triggered if:
"Menu\pH options\Warnings and Errors "
• ORP out of range – triggered if:
"Menu\ORP options\Warnings and Errors "
• Temperature out of range – triggered if:
"Menu\Temperature options\Warnings and Errors "
• Low level in acid/base tank – triggered if a level sensor is used:
"Menu\pH options\Setup\Acid/base tank Input " and
"Menu\pH options\Setup\Warnings and Errors "
• Low level in Cl tank – triggered if a level sensor is used:
2
"Menu\ORP options\Setup\Cl
"Menu\ORP options\Setup\Warnings and Errors "
• pH dosing overtime – triggered if the acid pump is dosing full time or is dosing in proportional control band for more
than value specified in settings. See:
"Menu\pH options\Setup\Overtime xxxmin"
• ORP dosing overtime – the Cl
specified in settings. See:
"Menu\ORP options\Setup\Overtime xxxmin"
Note: pH/ORP dosing overtime process errors are erased only at controller restart or by Manual contol.
The overtime counters are reset when Hold Input is active.
Process Error Specifications
• A process error condition is evaluated only if it's enabled.
Note: "No probe", "Hold input active" and "Remote Hold" are not dependent on "Warnings and Errors
• An active alarm deenergizes the Alarm Relay if the Alarm Activates Relay is enabled.
BL122 & BL123) – remotely triggered by user when checking the Remote Hold
tank Input " and
2
pump is dosing full time or is dosing in proportional control band for more than value
2
" settings.

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