YSI 5200 - Manual (Page 48)

YSI Incorporated 46 5200 Recirculating System Monitor
NOTE: Set Point, Control and Alarm System Menus are only available when a Manual Display Range is
selected (see Section 5.3.3 DO System, Setup Menu, Display Range) and the DO Interval is set to
Off (DO is on continuously). See Section 5.3.3 DO System, Setup Menu, Interval.
NOTE: DO readings are still compensated for salinity changes even if conductivity is disabled.
Calibration
Calibration is covered in Section 6 Calibration. DO can be calibrated in either % saturation
(recommended) or mg/L. See Section 6.2.2 Dissolved Oxygen Calibration for details.
Set Point Menu
Set Point Menu selections for DO are SetPoint, Range1 Low, Range1 High, Range2 Low, Range2 High,
Alarm Low and Alarm High.
SetPoint
The DO Set Point defines the optimum DO level that you wish the YSI 5200 to maintain in the aquatic
environment.
Figure 5-6 DO Setpoints
The DO system uses a more advanced control system employing two control ranges instead of just one as
in the other parameters (See Figure 5-6). The dual range design allows you to change the way oxygen
levels are managed in the system if the DO level moves out of the first range and into the second. This
provides the ability, for example, to use an air injection system (controlled by range 1) to maintain DO
levels for the first range and a pure oxygen injection system (controlled by range 2) as a backup should
the DO level continue to fall.
If the YSI 5200 senses that the DO level is outside of the operating Range #1 it will turn on the Range #1
control system. If the DO level continues to move outside of operating Range #2 then Range #2 control
system will activate.
NOTE: To allow for DO probe stabilization, the 5200 waits for two minutes after being powered up
before activating DO alarms or control.
Control Menu
After entering the DO set point and ranges, use the Control Menu to select which relay each range or
alarm will activate.
High
Alarm
Setpoint Low
Alarm
Setpoint
Optimal
Setpoint
Value
High
Alarm
ON
Low
Alarm
ON
Low
Control
Setpoint
#2 ON
(DO only)
High
Control
Setpoint
#2 ON
(DO Only)
Low
Control
Setpoint
#1 ON
High
Control
Setpoint
#1 ON
Acceptable
Operating
Range
Low
Control
ON
Hi
Control
ON