Ysi 5420 And Ysi 5421 (Galvanic) Probe Assemblies; Ysi 626250 Odo (Optical Dissolved Oxygen) Sensor - YSI MultiDO 5400 User Manual

CAUTION: run high and low voltage cabling through separate bulkhead and
conduit
•
where regular maintenance, including calibration can easily be done. Cali-
brations are performed using the 5X00 front panel.
Note:
- If a 5420 or 5421 sensor requires replacement, the entire probe/cable assembly
must to be replaced.
Locate sensor end of probe assembly:
5500
•
in a location that represents the entire system
•
Insert the probe into sample. Move the probe in the sample to release any
air bubbles and to provide a fresh sample to the sensor cap. This movement
is only necessary when first inserting the probe into the sample.
•
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
Installation and Wiring
YSI 5X00
36

YSI 5420 and YSI 5421 (Galvanic) probe assemblies

5400
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 49
for wiring directions.
Probes should be serviced on a regular basis. See DO Probe Maintenance - page 211.
Figure 3.12

YSI 626250 ODO (Optical Dissolved Oxygen) sensor

5500
The YSI 626250 probe assembly includes an ODO sensor and sensor cap. Sensor
cap refers to the removable sensing cap that is replaced about once per year (Figure
3.12a) YSI 626250 probe assembly includes a temperature sensor. An instruction
sheet is included with replacement sensor caps. This instruction sheet is important
because it includes the calibration coefficients for your sensor cap. After using this
sheet for general probe setup, be sure to store it in a safe place in case you need to
reload these calibration coefficients in the unlikely event that they are ever deleted
from the probe.
Installation and Wiring
YSI 5X00
37