Ysi 5561 probe assembly – YSI 5200A User Manual

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YSI 5200A

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.

Installation and Wiring

Note:

- All YSI sensors, except the temperature sensor on the 5561 cable, are field

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