22
Relay
Action
Hysteresis
mode
Effective RELAY-
ON
Setpoint
Effective RELAY-
OFF
Setpoint
HIGH
CENTER
S.P.+ ½(H.V.)
S.P. -½ (H.V.)
HIGH EDGE
S.P.
S.P.
–(H.V)
LOW
CENTER
S.P.-½ (H.V.)
S.P.+½ (H.V.)
LOW EDGE
S.P
S.P.+(H.V.)
S.P. = Relay Set point
H.V.= Hysteresis value (DeadBand)
D. CONDUCTIVITY/TDS RELAYS
There are two
independent Relay
channels for the TDS or
conductivity display
which has independent
set point and HIGH or
LOW action setting (see
fig. 1
). The hysteresis
mode (center or edge,
see
figure 1.
) and
hysteresis value will be
used by both relays.
The action of the
relays is dependent on
set point, relay action
(HIGH or LOW),
hysteresis mode (Edge
or Center ) , hysteresis
value and the current
conductivity or TDS
display. (see
fig. 1
).
Fig. 1
hysteresis
hysteresis
LOW
SET
POINT
HIGH
SET
POINT
POINT
SET
HIGH
hysteresis
hysteresis
EDGE CONTROL
ON
ON
OFF
OFF
ON
ON
ON
OFF
ON
OFF
OFF
OFF
OFF
ON
ON
OFF
CENTER CONTROL
High set ON/OFF control
Low set ON/OFF control
Low set ON/OFF control
High set ON/OFF control
LOW
SET
POINT
SP
SP
COND.
COND.
COND.
COND.
