Instruction Manual Section 9: Alarm Relay Functions
LIQ-MAN-56 April 2017
Alarm Relay Functions 71
5. Setpoint: Enter the desired setpoints value. This will activate an alarm event when the
process measurement reaches the entered setpoint value. Press ENTER/MENU. See Table
9
-3 for entry limits.
6. Select NEXT Press ENTER/MENU to advance to the next setup screen.
7. Deadband: To set deadband as a measurement value, enter the change in the process
value needed after the relay deactivates to return to normal (and thereby preventing re-
peated alarm activation). Press ENTER/MENU.
8. Normal state: Set the normal alarm condition as Open or Closed and press
ENTER/MENU. Program the normal state to define the desired alarm default state to nor-
mally open or normally closed upon power up.
9. Select NEXT Press ENTER/MENU to advance to the next setup screen: Configure feed
relay.
10. Feed relay: Assign relay 2, 3, or 4 as a feed relay and press ENTER/MENU.
11. Linked to bleed relay: No entry required. The relay originally programmed as the Bleed
relay is displayed.
12. Delay time: Enter the time in minutes (X.X min) after the Bleed time is activated before
triggering this feed relay.
13. Feed time equals: Enter the percent of time that the Bleed timer is on (X.X%) to activate
this feed relay (for pumping make-up water chemicals).
* See Appendix 1 – HART and Device Variables
9.5 Totalizer Based Relay Activation
9.5.1 Description:
A totalizer based timer feeds chemicals for a preset period every time a programmed volume
of liquid has been added to or removed from a vessel. The relay energizes when the volume
has been reached and remains energized for a fixed time. The process repeats once the
volume has been reached again.
Totalizer Based Relay Activation triggers a relay at user-defined intervals based on
accumulated totalized flow. The scheme uses pulse inputs from a flow meter or 4-20mA
current input(s) from a flow transmitter to calculate total flow (as volume).
Relay Function Limits and Selections Default
Bleed and Feed NA NA
Logic Low/High High
Setpoint * *
Deadband * 0.000
Normal state Close/Open Open
Feed relay 1, 2, 3, 4 not assigned
Linked to bleed relay 1, 2, 3, 4 1
Delay time 0 - 999.9 min 1.0 min
Feed time equals 0 - 999.9% of bleed time 10.0% of bleed time
Normal state Close/Open Open
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