PART THREE - OPERATION
SECTION 4 - CONFIGURING THE ANALYZER
Rev. 2-300
Accu4™ Low-range Turbidimeter System
47
☞
Table A -- RELAY CONFIGURATION SETTINGS -- continued
Setting
Description
For CONTROL Relay (continued)
Deadband
Sets the range in which the relay remains on after the
measured value decreases below the setpoint value
(high phase relay) or increases above the setpoint
value (low phase relay).
Overfeed
Timer
Sets the time (0-999.9 min.) to limit how long the re-
lay can remain “on.” For more details on overfeed
timer operation, see Part Three, Section 7.
Off Delay
Sets a time (0-300 seconds) to delay the relay from
normally turning off.
On Delay
Sets a time (0-300 seconds) to delay the relay from
normally turning on.
For STATUS Relay
Fail
Sets the relay to turn on only when there is a FAIL
condition (analyzer, light source or detector) or a
sensor CHAMBER UNKNOWN condition.
Warn
Sets the relay to turn on only when there is a sensor
flow CHAMBER DIRTY condition.
All
Sets the relay to turn on when there is any abnormal
system condition (any FAIL condition, or sensor flow
CHAMBER DIRTY or UNKNOWN condition).
NOTE:
Also, it is possible to enter values that always keep
a relay active or inactive. To avoid this, be sure that
“low” values are lower than “high” values.
The “off delay” and “on delay” settings, available to
CONTROL or ALARM relays, may be beneficial in eliminat-
ing process “overshoot” when there are long process pipe
runs or delays in mixing.
Suppose Relay A is an ALARM. To set configuration values:
1.
With the
screen displayed, use
Ø
Ø
key
to select the “ACTIVATION” line.
2.
Press
ENTER key
to display
.
3.
Use
Ø
Ø
key
to select the appropriate relay setting line,
and press
ENTER key
to display its corresponding
edit/selection screen.
