Sondes
Section
2
YSI Incorporated
Drinking Water Monitoring Systems Operations Manual
2-68
Return to the Main menu using the
Esc
key and select
2-Calibrate
and then
4-Free Cl2.
At the prompt, input the independently determined free chlorine value and press
Enter
. A display similar
to that shown below will appear on either the computer monitor or the 650 display. The calibration will
occur automatically after the countdown on the screen reaches zero.
After the warm-up time is complete, the readings just before and just after calibration are displayed. When
you press
Enter
, the screen returns to the Free Chlorine Calibration menu.
FREE CHLORINE WITH SONDE ATTACHED TO 6500 PROCESS MONITOR
See
Appendix G. Using Your Drinking Water Sonde with a YSI
6500 Process Monitor
for enhanced calibration instructions and a detailed description of the Sample and
Hold feature.
NOTE CAREFULLY:
The 6572 free chlorine sensor MUST be calibrated
in situ
, i.e. in flowing drinking
water whose free chlorine content has been determined by an independent method. In many cases, the
independent method involves the use of the DPD Colorimetric Method as defined in Section 4500-Cl G of
Standard Methods for the Examination of Water and Wastewater
. Relatively inexpensive colorimeters,
such as the YSI Models 9000 and 9100 and the Hach Model 5870000, are available for carrying out the
DPD method to determine the free chlorine in the effluent of the flow cell associated with the 6920DW or
600DW-B drinking water studies.
In most cases, the free chlorine sensor should be calibrated AFTER it has been attached to the 6500 Process
Monitor for 2-3 hours to assure the stabilization of the free chlorine sensor in the flowing tap water. See
-------------Advanced setup-----------
1-(*)VT100 emulation
2-( )Power up to Menu
3-( )Power up to Run
4-( )Comma radix
5-(*)Auto sleep RS232
6-(*)Auto sleep SDI12
7-( )Multi SDI12
8-( )Full SDI12
Select option (0 for previous menu): 0
===================================================================
Temp SpCond Sal Cl2 Cl2 Chrg Depth pH NH4+ N NO3- N Turbid
C mS/cm ppt mg/L feet mg/L mg/L NTU
-------------------------------------------------------------------
Stabilizing: 38
