YSI 5200 - Manual (Page 38)

YSI Incorporated 36 5200 Recirculating System Monitor
Figure 5-3 Setpoints and Ranges
When these values are entered, the system will operate as illustrated in Figure 5-3. As long as the water
quality parameters remain within the acceptable operating range, no control or alarm will be activated. If,
however, a parameter rises above or falls below the acceptable operating range, the YSI 5200 will activate
the appropriate control device. The control device remains in operation until the parameter returns to the
Set Point value.
As you enter a Set Point value, the YSI 5200 may prompt you if there are problems with the set up. If the
High or Low value breaches the optimal Set Point, you will see an Autofix question displayed that will
automatically adjust your High or Low value to a value
±0.1 or ±0.01 to the high or low side of your
optimal Set Point depending on the parameter of interest. For example, pH will be adjusted to the
hundredths place while DO will be adjusted to the tenths place.
If you had your optimal Set Point at 8.0 mg/L for DO and the Low range at 7.8 and the High range at 8.2
and you changed your optimal Set Point to 7.7 then attempted to escape without resetting the High and
Low ranges, you would see the following displayed:
S e t p o i n t E r r o r s .
A u t o F i x ? Y E S
If you choose YES, the Low range Set Point would automatically be adjusted to 7.6, but the High range
Set Point would remain 8.2 because it did not get breached.
IMPORTANT: For Controlling Applications, it is highly recommended that you use Alarms and verify
all Set Point, Alarm and Control Range settings.
This product has been designed and tested to provide trouble free service. However, as with all
microprocessor based products, there is potential for failure which could cause loss of control functions.
Proper QC procedures can reduce the potential for failure. See 11.3 Recommended Quality Assurance
Protocol.
The default set point and alarm values loaded during factory configuration are shown below.
High
Alarm
Setpoint Low
Alarm
Setpoint
Optimal
Setpoint
Value
High
Alarm
ON
Low
Alarm
ON
Low
Control
Setpoint
ON
High
Control
Setpoint
ON
Acceptable
Operating
Range
Low
Control
ON
Hi
Control
ON