YSI 600DW-B Sonde - Manual (Page 98)

Sondes Section 2
To edit one of the following menu items choose the number or letter that corresponds to it.
TDS constant=0.65 This selection allows you to set the constant used to calculate TDS. TDS in g/L is
calculated by multiplying this constant times the specific conductance in mS/cm. This
item will only appear if the conductivity sensor is enabled in the “Sensors enabled”
menu. See Section 5, Principles of Operation for more information on the TDS
parameter.
Cl2 temp co=2.5 %/C
This selection allows you to input the free chlorine temperature coefficient. Do
not change this value unless you consult YSI Customer Service. This item will only
appear if the free chlorine sensor is enabled in the Sensors menu.
Cl2 warm up=60 This selection allows you to set the amount of time allowed for Cl2 warm up in seconds.
Normally the default value of 60 seconds is adequate for most applications. However,
there may be certain situations in which greater free chlorine accuracy can be attained by
increasing this time. Consult YSI Customer Service if you feel that your Cl2 warm up
time is incorrect. This item will only appear if the free chlorine sensor is enabled in the
Sensors menu.
(*)Wait for Cl2 When this feature is enabled, the sonde is forced to wait for the Cl2 warm up time to
expire before displaying any readings. Note that in SDI12 mode or while calibrating the
Cl2 sensor, the warm up time is used regardless of the activation of this item. Disabling
this item allows you to see data without having to wait during the Cl2 warm up time.
Under normal operating conditions, this item should be turned off. If you are using
the sonde with a data logger in RS232 mode and will be turning the sonde “on” and “off”
for each sample, then you may want to enable this item so that only stable Cl2 data are
recorded. This item will only appear if the Cl2 sensor is enabled in the Sensors menu.
Wipes=1
If a turbidity, chlorophyll, or rhodamine WT sensor is enabled, this selection will
determine the number of cleaning cycles which will occur when the wiper is activated
manually or automatically. Since the wiper functions bidirectionally, a selection of “1”
results in two passes of the wiper over the optical face. In most applications, a single
cleaning cycle is adequate to keep the optical surface free of bubbles and fouling.
However, in particularly harsh environments additional cleaning cycles may be needed
and can be selected here. This item will only appear if a turbidity, chlorophyll, or
rhodamine WT sensor is enabled in the Sensors menu.
Wipe Int=1
In applications where a turbidity, chlorophyll, or rhodamine WT probe is installed in the
sonde and the instrument is collecting data in the SDI-12 communication mode, the wiper
mechanism of the probe should be activated automatically in a periodic manner to clean
the optical surface for fouling and bubbles. The value entered at this selection is the
number of minutes between each automatic cleaning cycle. Thus, if Wipe Int is set to
“5” and the instrument is in the Run mode, the wiper will activate every 5 minutes with
no manual input. This item will only appear if a turbidity, chlorophyll, or rhodamine WT
sensor is enabled in the Sensors menu.
The value of Wipe Int is sometimes overridden when the instrument is set up in the
Unattended sampling mode. Under these conditions, the wiper will be automatically
activated at the interval assigned in the Unattended setup rather than that assigned in
Wipe Int. Thus, in an Unattended study setup at a 15 minute sampling interval, the wiper
will be activated only once every 15 minutes rather than at the indicated Wipe Int of 1
minute.
YSI Incorporated Drinking Water Monitoring Systems Operations Manual 2-91