Thermo Fisher Scientific ECDOTPII-S User Manual

Instruction Sheet

ECDOGEN-S / ECDOTPII-S

Submersible Galvanic Dissolved Oxygen Sensor

Blk 55, Ayer Rajah

Crescent, #04-16/24 Singapore 139949

+65 6778 6876

+65 67730836 fax

www.thermofisher.com

HOW DISSOLVED OXYGEN SENSORS WORK

Your Dissolved Oxygen (DO) Probe is a galvanic electrochemistry device; i.e. it does not require power from your meter or controller to generate its signal. The Sensorex DO Probe will provide a millivolt signal proportional to the concentration of oxygen in the water. DO probes do not measure oxygen directly. They measure the partial pressure of oxygen in the water, which is directly proportional to the percent saturation of oxygen in the water. The concentration (mg/L or ppm) can be calculated based upon the oxygen solubility, temperature, salinity, and total atmospheric pressure. Your Dissolved Oxygen Probe consists of a cathode, anode, and an electrolyte separated from your process fluid by an oxygen permeable membrane. The oxygen passing through the membrane reacts with the cathode, giving up electrons, which produce an electrical current. A Pt 100 RTD temperature sensor is also included.

Electrical Connections

First connect the sensor to the DO instrument as follows:

DO + Red DO - Yellow TC+ Red, White TC – Black

GETTING YOUR DO SENSOR READY TO USE

Remove clear wire and label from vent hole on top of DO sensor as shown in FIG 1. Discard these parts after removing.

CALIBRATION

The simplest method to calibrate your DO sensor is in air, since air is saturated with oxygen. You may also bubble oxygen or air. The sensor is pre-calibrated at the factory (see Specifications Section for calibration range). If you want a 2-point calibration, a saturated solution of sodium sulfite (Na2SO3) is suggested. 17g Sodium sulfite in 125mL DI water is more than enough. Sodium sulfite will not reach a true zero output but it should reach less than 1 mV (see Specifications Section for range).

www.thermofisher.com

+ 4 hidden pages