YSI 6500 Environmental Process Monitor - Manual (Page 5)

SECTION 1 INTRODUCTION
The 6500 Environmental Process Monitor is designed for configuration with YSI 6-Series
sonde(s) to measure up to fifteen water quality parameters. All sensors that perform the parameter
measurements are located on the 6-Series sonde, which is submersed and secured in the medium.
Conversion of the sensor signals from analog to digital is performed by microprocessor based
electronics located in the 6-Series sonde interior. The signals are transmitted via cabling to the
6500 Environmental Process Monitor using SDI-12 protocol.
The 6500 Environmental Process Monitor can be used for a wide variety of sampling and
monitoring applications, including, monitoring at either municipal or industrial wastewater
treatment plants, drinking water intake, source water, and a variety of other applications. Other
municipal and industrial process applications encompass a wide range of matrices (e.g., influent
and aeration basins) and the overall performance of the 6-Series sonde is typically site-specific,
particularly with regard to fouling of the sensors. In addition, the industrial end-user should be
aware of potential incompatibility of their process environment with the operating range and/or
the construction materials of the sonde body and the sensors.
1.1 6500 MONITOR FEATURES
Water quality parameter data can be viewed on the liquid crystal display (LCD) of the 6500
Monitor. Additionally, the 6500 Monitor contains 8 x 4-20 mA loop outputs that can be assigned
to the various parameters. The 4-20 mA loop outputs provide the means for logging parameter
data either (1) by direct recording of the loop outputs with a data logging device or (2) by
interfacing the loop outputs with a SCADA system. A set of 4 relays is also present that can be
activated by pre-set limit values. The relays are intended to drive alarm indicators, such as lamps,
horns or automatic phone dialer systems.
System set-up, including calibration of the 6-
Series Sonde sensors, can be performed at the
site with the 6500 Monitor front panel keys
and LCD or in the laboratory with a personal
computer or a YSI 610 Display/Logger.
Ports for up to three non-metallic watertight
conduit fittings are located on the 6500
Monitor bottom panel and provide the means
for connecting the AC power input, the 4-20
mA loop outputs and the relay output
conductors via conduit to the I/O plate located
within the 6500 Monitor enclosure.
Connection of the 6-Series Sonde to the 6500
Monitor is accomplished with a watertight connector located on the bottom panel of the 6500
Monitor. There are two means to connect the 6-Series Sonde to the 6500 Monitor. The sonde
may be connected directly via the sonde cable, or if the sonde is not
located in the vicinity of the
6500 Monitor installation, an optional YSI #6508 Junction Box may be used with customer-
supplied cabling.
Enter
Esc
Cal
6500 6500
EN VIRO N MEN TAL EN VIRO N MEN TAL MO N ITO RIN G MO N ITO RIN G SYSTEM SYSTEM
21.2 Temp
7.35 DO
6.53 pH
4-20 mA out
Relay output
AC power in
Sonde cable
w/ MS-8
Effluent Stream
Sonde
Alarms
SCADA