YSI 5500D-1 - Manual (Page 19)

YSI 5X00
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YSI 5X00
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• Since the ProODO utilizes optical luminescent technology, continuous
sample movement or stirring is not required. (Please note however that flow
does increase response time of sensor.) The probe will fit into a 300 mL BOD
bottle for taking initial and final BOD readings. For best results in a BOD
bottle, a stirring device should be used to properly mix the sample and to
keep solids from settling at the bottom.
• Allow the temperature readings to stabilize and wait approximately 25-35
seconds for the DO readings to stabilize.
• in a location that is free from debris (e.g. algae); ideally at a 45˚ angle from
vertical position and directed with the flow.
• 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 sensors
to the atmosphere.
• so the sensor/probe cabling is not routed near rotating machinery and/or
equipment involving electrical switching or regulation
• so that the sensor 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 and
conduit
In addition to the above considerations, locate the temperature sensor(s):
• in a location that accurately reflects the temperature of the DO sensor it
is monitoring.
YSI 5422 Polarographic DO/Temperature Probe Assembly
The YSI 5422 probe assembly includes a polarographic DO and temperature sensor.
The DO sensor is shipped with a red protective cap. Remove the red cap and install
a new membrane with fresh electrolyte onto the DO sensor prior to use. Complete
instructions are provided with the sensor and membrane kit.
Figure 3.11 shows the external parts of the YSI 5422 probe assembly.
After installing the probe in its monitoring location, Wire Sensors - page 50 for
wiring directions.
Probes should be serviced on a regular basis. See DO Probe Maintenance - page
191. Allow approximately 10 to 15 minutes after the 5X00 is powered on, or after
servicing the DO sensor, for the polarographic sensor to stabilize.
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Figure 3.11
YSI 5420 (Galvanic DO) and YSI 5421 (Galvanic DO/Tempera-
ture) probe assembly
The YSI 5420 probe/cable assembly includes a galvanic DO sensor. The YSI 5421
includes a galvanic DO and temperature sensor. The DO sensor on both of these
cables 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 kit.
Figure 3.12 shows the external parts of the YSI 5420 probe/cable assembly.
After installing the probe in its monitoring location, see Wire Sensors - page 50
for wiring directions.
Probes should be serviced on a regular basis. See DO Probe Maintenance - page 191.
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Installation and Wiring Installation and Wiring