YSI 5200A - Manual (Page 18)

YSI 5200A
34 YSI 5200A
35
to these measurements. Therefore, it is essential to have accurate measurements
at the sensors’ location. Locate the sensors of the probe assembly according to the
following specifications.
Place the sensor end of the probe assembly:
in a location that represents the entire system •
where the water flow is at least 3 inches per second (7.6 cm/sec) if using •
the 2.0 mil PE membrane or at least 6 inches per second (15.24 cm/sec)
for 2.0 mil Teflon membrane
in a location that is free from debris (e.g. algae); ideally at a 45˚ angle from •
vertical position and directed with the flow - figure 3.10
Figure 3.10
in a well mixed, free-flowing area; midstream and mid-depth typically gives •
representative readings; the probe assembly and cable are fully submersible
up to the cable connector
submersed at all times so liquid level fluctuations do not expose the sen- •
sors to the atmosphere
so probe cabling is not routed near rotating machinery and/or equipment •
involving electrical switching or regulation
so that the probe assembly and cabling are located away from sources of •
electrical interference such as UV sterilizers, florescent lighting, ballasts,
pumps, any high voltage peripheral devices, etc.
CAUTION : run high and low voltage cabling through separate bulkhead fitting
and conduit
where regular maintenance, including calibration can easily be done. •
Calibrations are performed using the 5200A front panel.
Note:
All YSI sensors, except the temperature sensor on the 5561 cable, are field -
Installation and Wiring
replaceable. Individual sensors can be ordered and replaced by the user
without returning the probe/cable assembly to the factory.
YSI 5561 Probe Assembly
The YSI 5561 probe assembly includes a DO and temperature sensor. The DO sensor
is shipped with a dry membrane. A new membrane with fresh electrolyte must be
installed on the DO sensor prior to use. Complete instructions are provided with
the sensor and membrane kits.
Notes:
- Replace the dry, shipping cap membrane with a 2 mil PE (blue) membrane
or 2.0 mil Teflon (gray) membrane following the instructions provided
with the membrane kit.
Do not discard the calibration/storage cup. It is used for calibrating and -
storing the sensor when not in use.
Allow approximately 10 to 15 minutes after the 5200A is powered on, or -
after servicing the DO sensor, for the polarographic sensor to stabilize.
Figure 3.11 shows the external parts of the YSI 5561 probe assembly.
Figure 3.11
Installation and Wiring