Manual

YSI 5X00

Figure 3.12

YSI 626250 ODO (Optical Dissolved Oxygen) sensor

e 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. is instruction sheet is important

because it includes the calibration coecients for your sensor cap. Aer using this

sheet for general probe setup, be sure to store it in a safe place in case you need to

reload these calibration coecients in the unlikely event that they are ever deleted

from the probe.

Figure 3.12a

5500

Directions to prepare the ODO probe for the rst time:

1. Remove the metal probe guard from the probe by turning it counterclock-

wise.

2. Remove the red storage cap which contains a moist sponge from the end of

the probe by pulling it straight o the sensor. Save this to use later for long

term storage.

3. Reinstall the probe guard by sliding it carefully over the sensor and then

threading it onto the cable/probe assembly with a clock.

4. Calibrate probe - page 85.

Notes:

- A new cable/probe assembly already has a sensor cap installed and the sensor

cap coecients are preloaded into the probe at the factory.

- Perform ODO calibration whenever ODO caps are replaced see Calibration

page 85.

Install Temperature Sensors

e 5X00 system will support 4 Temperature/Aux Analog inputs. Temperature sen-

sors are included on YSI 5421 (galvanic), 5422 (polarographc) and 626250 sensor

and/or sensor assemblies. Alternate temperature sensors can be used but must be

thermistors with 10K at 25C . See Appendix 6 Alpha Curve - page 236.

Aer installing the temperature sensor in its monitoring location, see Wire Tem-

perature Sensors - page 54.

Probes should be serviced on a regular basis. See Probe Maintenance - page 191.

Wiring Information

System components must be wired correctly to ensure reliable performance and

accurate data collection. Directions are provided on the following pages for wiring

all components and peripheral devices.

PCBs

ere are four printed circuit boards (PCBs) inside the 5X00 enclosure. ey are:

- Display board (mounted in the front panel)

- I/O board is attached to a metal plate inside the enclosure and is visible when

front panel is removed

- DO daughter board mounted to the I/O Board

- Control board (connected to the under side of the I/O Board)

Installation and Wiring