YSI 5200 - Manual (Page 19)

YSI Incorporated 17 5200 Recirculating System Monitor
3.5 Installing the 5562 or 5561 Probe Assemblies
CAUTION: Keep pH and ORP probe tips IN A MOIST ENVIRONMENT at all times.
After you have chosen suitable sites for the monitor and probe, proceed with the probe installation as
described below.
Avoid routing probe cabling near wiring associated with rotating machinery and/or equipment involving
electrical switching or regulation. In all cases, it is desirable to locate the probes away from sources of
electrical interference such as UV sterilizers, florescent lighting, ballasts, pumps, etc. Consider placing
probe cabling in grounded metallic conduit if unstable readings appear due to electromagnetic
interference.
The 5200 can be configured with either a 5562 multiprobe assembly (DO, Conductivity, Temperature,
and optional pH or pH/ORP sensors) or a 5561 DO/Temp probe assembly.
NOTES: When the 5200’s control functions are to be used, probe placement will be critical to the
operation of the system. Consequently, a professional should be consulted when designing the
system.
Water flow is important to the operation of the DO sensor. In addition, the mixing action provided
by water flow ensures that the area of sampled water is representative of the entire body of water.
Probe installation steps:
1. Select a suitable location for the probe assembly that allows for adequate water flow across the
DO sensor (approximately 0.5 ft/sec).
2. Select a method of securing the probe assembly.
3. Determine a method of routing and securing the cable.
In-Filter Location— A common place for probe location is in the filter. Installing probes in a filter or
sump requires that the probe be secured or hung in an area that will allow for adequate water flow across
the DO sensor (approximately .5 ft/sec).
In-Filter Location Using a Float—A float installation keeps probes at a constant depth, and is
economical to purchase or construct.
To construct a probe float, cut a hole (slightly smaller than the probe diameter) through a small piece of
Styrofoam. Insert the probe into the float so that the entire sensor guard protrudes through the Styrofoam
and the sensors are completely submerged.
In-Tank Location—Installing the probe assembly in a tank requires that the assembly be secured or
hung in an area that will allow for adequate water flow across the DO sensor (approximately 0.5 ft/sec). It
is preferred that the probe be secured so that the cable is not constantly flexed.
If using the 5562, the probe assembly can be secured using the 5205 Probe Mounting Kit or 6511 Probe
Rail Mount Kit. See Section 3.5.2 5205 and 6511 – Optional Probe Mount Kits for 5562 Probes. A
mounting kit is not available for the 5561 probe.
In-Line Location Using a Tee-Fitting—Although in-line probe placement is more time consuming and
requires some extra plumbing, it has been found to be a very effective and safe way to place probes. In-
line placement gives accurate readings because water is moving across the probe tips at all times. It also
minimizes biological growth on the sensors.
IMPORTANT NOTE: When maintenance and/or calibration of the sensors is required, the probe
assembly will have to be removed from the in-line fitting. Take this into account when designing the
system. If water flow must be maintained during maintenance, by-pass plumbing will be required.