Hach-Lange POLYMETRON 9500 User Manual - Manual (Page 33)

Option Description
LOW DEADBAND Sets the range where the relay remains on after the measured value increases above
the low alarm value. For example, if the low alarm is set for 1.0 and the low deadband is
set for 0.5, the relay remains on between 1.0 and 1.5. Default is 5% of the range.
HIGH DEADBAND Sets the range where the relay remains on after the measured value decreases below
the high alarm value. For example, if the high alarm is set for 4.0 and the high deadband
is set for 0.5, the relay remains on between 3.5 and 4.0. Default is 5% of the range.
OFF DELAY Sets a time (0-300 seconds) to delay the relay from normally turning off (default:
0 seconds).
ON DELAY Sets a delay time for the relay to turn on (default: 0 seconds).
Figure 17 Alarm function
1 High alarm 4 Low alarm 7 Time (x-axis)
2 High deadband 5 ON delay 8 Source (y-axis)
3 Low deadband 6 OFF delay
• Feeder control function (refer to Figure 18 and Figure 19 )
Option Description
PHASE Defines the relay status if the process value exceeds the setpoint.
HIGH (default)—turns the relay on when the process value exceeds the setpoint.
LOW—turns the relay on when the process value falls below the setpoint.
SET SETPOINT Sets the process value at which the relay toggles. The default value is different for each
sensor.
DEADBAND Sets the area for an amount of change necessary after the relay setpoint is reached in
order to satisfy a condition.
OVERFEED TIMER Sets a time period for de-activating an active relay if the process setpoint cannot be
reached. Once an overfeed alarm is present, it must be manually reset.
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