YSI 5200 - Manual (Page 57)

YSI Incorporated 55 5200 Recirculating System Monitor
NOTE: Set Point, Control and Alarm System Menus are only available when a Manual Display
Range is selected. See Section 5.3.6 Conductivity System, Setup Menu, Display Range.
Calibration
Calibration is covered in Section 6 Calibration. See Section 6.2.3 Conductivity Calibration for details.
Set Point Menu
Conductivity control, like pH, can operate in two different ways. It can operate the same as most other
5200 control systems—when the parameter value reaches the low or high range setpoint, control is
activated until the value returns to the optimal setpoint. Or, it can operate in a timed mode—when the
value reaches the low or high range setpoint, control is activated for a fixed length of time (Dose Time)
regardless of whether or not the value returns to the optimal set point. The 5200 then waits for a fixed
length of time (Dose Wait) before checking the value of the parameter and applying additional control.
The default method of Conductivity control is the timed mode. To select the normal mode, set the Dose
Time to 0.
When using timed mode, additional values must be entered on the Set Points Menu, including the dose
and dwell (Dose Wait) values. The dose time allows you to establish the length of time a dose is
administered and the dwell time allows for a period between doses to prevent over-applying a dose.
SetPoint
The Conductivity Set Point defines the optimum Conductivity level that you wish the YSI 5200 to
maintain in the aquatic environment. See Section 5.3.1 Entering Setpoint and Range Values for an
overview of control functions.
Dose Up
Dose Up in seconds (time per dose) is the amount of time that the YSI 5200 will dose to bring the
conductivity level back up into the target operating range to the optimal Set Point. The acceptable values
for dosing are from 1 to 999 seconds. A Dose Up Wait time forces the YSI 5200 to wait before applying
another dose. This will prevent the value from rising too fast. Set to 0 to select normal conductivity
control (see Section 5.3.6 Conductivity System, Set Point Menu).
WARNING: If the 5200 is instructed (by AquaManager) to transmit logged data during the Dose Up
cycle, dose time will be extended until data transmission is complete (up to 3½ minutes maximum with a
full data log).
Dose Up Wait
Dose Up Wait (in minutes), or dwell time, is the length of time that the YSI 5200 will wait until dosing
can occur again. This feature prevents overdosing a system with a dosing solution and protects against
“short cycling” of equipment.
Dose Down
Dose Down (in seconds) controls the length of time the 5200 will dose. The range is from 0 to 999
seconds. A Dose Down Wait time forces the YSI 5200 to wait before applying another dose. This will
prevent the value from dropping too fast.
WARNING: If the 5200 is instructed (by AquaManager) to transmit logged data during the Dose Down
cycle, dose time will be extended until data transmission is complete (up to 3½ minutes maximum with a
full data log).