ATI
Q45C2 2E Conductivity System
Part 4 – Configuration
O & M Manual
Revision K (01/07)
- 36 -
Figure 4-3 Control Relay Example, Hysteresis and Two Opposite Phase Options
If Relay A Mode is set to Alarm Mode,
AL
, then the following
settings will appear in the Config Menu list automatically. In
this mode, two setpoints can be selected on the same relay,
to create an alarm band. Phase HI selection causes the
relay to energize outside of the band, and Phase LO causes
the relay to energize inside of the band. This feature
enables one relay to be used as a control relay while the
other is used as a HI-LO Alarm relay at the same time.
Setpoint A-LO must be set lower than Setpoint A-HI. When
AL mode is first selected, Setpoint A-LO is defaulted to 0.
Figure 4-4 is a visual description of a typical alarm relay
application.
Figure 4-4 Alarm Relay Example
Setpoint A-HI: 1.000 µS
Setpoint A-LO: 0.500 µS
Hyst
A-HI: 0.050
Hyst
A-LO: 0.05
Delay
A-HI: 000
Delay A-LO: 000
When value rises to
≥
1.000 µS, relay closes,
until value falls back to
≤
0.950 µS.
Settings:
When value falls to
≤
1.000 µS, relay closes,
until value rises back to
≥
1.050 µS.
When value rises to
≥
0.500 µS, relay closes,
until value falls back to
≤
0.450 µS.
When value falls to
≤
0.500 µS, relay
closes, until value rises back to
≥
0.550 µS.
*Setpnt A-HI
*Hyst A-HI
*Delay A-HI
*Setpnt A-LO
*Hyst A-LO
*Delay A-LO
