Manual

YSI 5X00
35
YSI 5X00
34
For accurate DO measurements, ensure that the temperature reading for each DO
channel is representative of the temperature at that DO sensor’s location.
is is important when using the same temperature input source for multiple DO
sensors. Example - if the temperature source for DO1 and DO2 is the temperature
sensor connected to Aux 3 at the DO1 sensor location, it is important that the tem-
perature at the DO2 sensor location is the same as at DO1 sensor location.
See Chapter 4 Sensor Setup - page 137, for information on conguring 5X00
sensor systems. User dened sensor conguration items include:
- Display format (i.e. units of measure. For example, mg/L or % saturation,
°C or °F)
- Temperature source
- Salinity input value (user entered salinity value of the water being moni-
tored)
- Elevation monitoring system
- Setpoint, control, and alarm values and ranges
- Control and alarm relay assignments
Location Considerations
Readings gathered at the sensor location(s) are data logged and processed by the
5X00 instrument. Output control and alarm devices are congured to respond to
sensor values. erefore, it is essential to have accurate readings at the sensor loca-
tion. Locate sensors according to the below specications.
Locate sensor end of probe assembly:
• in a location that represents the entire system
• where the water ow 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 Teon membrane
• in a location that is free from debris (e.g. algae); ideally at a 45˚ angle from
vertical position and directed with the ow - gure 3.10
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Figure 3.10
• in a well mixed, free-owing 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 uctuations 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, orescent lighting, ballasts,
pumps, any high voltage peripheral devices, etc.
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:
- e YSI 5422 DO sensor is eld replaceable and can be replaced without
replacing the probe cabling. e 5420 and 5421 DO sensors are not replace-
able. If a 5420 or 5421 sensor requires replacement, the entire probe/cable
assembly needs to be replaced.
Locate sensor end of probe assembly:
• 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. is movement
is only necessary when rst inserting the probe into the sample.
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Installation and Wiring
Installation and Wiring