YSI APPENDIX F - Manual

Quick Start Guide to Drinking Water Studies Appendix F
APPENDIX F
QUICK START GUIDE TO DRINKING WATER
MONITORING
Introduction: This Quick Start guide is designed to allow users who are already familiar with the basic use
of YSI 6-series sondes for surface or groundwater applications to get up and running quickly in drinking
water applications. Users who have not previously used 6-series sondes should carefully read the 6-series
sonde manual supplied with the drinking water sondes prior to beginning any studies and only use this
Quick Start guide after a thorough understanding of the use of the YSI multiparameter instruments has been
gained.
Description of YSI Drinking Water (DW) Sondes: The 6920DW and 600DW-B drinking water sondes
have many identical features to other YSI 6-series instruments as detailed below:
• They interface to computers, the YSI 650 display/logger, the YSI 6500 process monitor, and data
collection platforms.
• They utilize the same cables.
• The calibration of all sensors other than free chlorine is carried out in the same way.
• Discrete Sampling and Unattended Sampling studies are set up in the same way.
However, there are some key differences from the standard YSI 6-series sondes:
• The sonde contains a new circuit board which will allow the measurement of free chlorine instead
of dissolved oxygen. At the present time, dissolved oxygen cannot be measured with DW sondes.
• The new free chlorine probe is very similar in appearance to the Rapid Pulse dissolved oxygen
probe and is designed to fit in the “DO” port of the sonde. The free chlorine sensor will probably
be ordered as an accessory with each DW sonde.
• The DW systems are designed for use in flow cell applications and the appropriate flow cell
should have been ordered with your DW sonde. The sonde can be used in drinking water tanks
without the flow cell, but the flow dependence of the free chlorine sensor may result in a
significant compromise in accuracy under these conditions.
• The free chlorine probe must be calibrated in situ versus a known chlorine value – usually
determined from a DPD analysis.
• The membrane of the free chlorine sensor is a different material (polyvinylidene fluoride) from
that used with YSI dissolved oxygen sensors (Teflon or polyethylene) and must be installed using
special tools.
• The electrolyte used with the free chlorine sensor is different from that used with YSI dissolved
oxygen sensors. Dissolved oxygen electrolyte should not be used with the free chlorine sensor.
YSI Incorporated Drinking Water Monitoring Systems Operations Manual F-1