Liquid Dosing Control Manual
9.17.150 rev A – September 2020
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2.2.6 Dosing specific settings – Response Alarm / Dry Running Protection Alarm
Enable Response Alarm / Dry Running Protection Alarm
The response alarm is setup to trigger when the measured value does not reach the setpoint
within a certain time. A band around the setpoint must be configured in which the measure is
valid. The range in which the measure should be is se Maximum Limit and setpoint –
Minimum Limit.This alarm can be useful to indicate a potential problem in the liquid flow setup.
Examples
- Liquid supply vessel is empty
- Blocked fluid lines preventing liquid to be supplied or blocking the flow downstream
- Tubing is incorrectly dimensioned
For pump systems this alarm can be used to prevent Dry Running, which can damage the pump
head and reduce the lifetime.
Disable protected mode
- Write value 64 to parameter 7 – Init Reset
(unlock secured parameters)
Enable and set the Response Alarm
- Write value 2 to parameter 118 - Alarm Mode
(enable response alarm)
Value 0 = alarm disabled
Value 2 = alarm on limits related to setpoint (response alarm) 100%
- Write <delay time> to parameter 182 – Alarm Delay Time
(delay before alarm)
Value defined in seconds between detection and triggering an actual alarm
- Write <maximum limit> to parameter 116 – Alarm Maximum Limit (0 – 32000)
- Write <minimum limit> to parameter 117 – Alarm Minimum Limit
(0 – 32000)
0 – 32000 = 0 – 100%
A limit of 5% translates to a value of 1600
Define action when alarm triggers
- Write <setpoint mode> to parameter 120 – Alarm Setpoint Mode (enable alarm action)
Value 0 = no action
Value 1 = change setpoint to ‘Alarm new Setpoint’
- Write <alarm new setpoint> to parameter 121 – Alarm New Setpoint
(new setpoint)
Define new setpoint after alarm trigger, value 0 – 32000
Value 0 = 0% setpoint
Value 3200 = 10% setpoint
Enable protected mode
- Write value 82 to parameter 7 – Init Reset
(lock secured parameters)
