Hach Polymetron 9500 User Manual page 32

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