PASCO Specialty & Mfg. PS-2108 User Manual download pdf (Page 10)

PASPort Dissolved Oxygen Sensor Model No. PS-2108

General Sampling Procedure

1. Immerse the Dissolved Oxygen probe into the test solution until the silver temperature

compensation band is submerged.

2. Click the Start button on the DataStudio tool bar or select Monitor Data from the

Experiment menu.

3. Gently, swirl the probe for a minute or two until the dissolved oxygen readings stabilize

around a value. As an alternative, use a magnetic stirrer to slowly stir the test solution (do

not stir fast enough to entrain air bubbles or form a large vortex.

Measurements in a Controlled Laboratory Setting

In a laboratory setting, you can make long-term measurements of dissolved oxygen levels by

gently and continuously stirring the solution with a magnetic stir plate and stir bar. Minimize

the surface area of the atmosphere/liquid interface to retard gas exchange with the

atmosphere. A vessel such as an Erlenmeyer flask or a large test tube works well.

Note: DO NOT USE MINERAL OIL, as it is difficult to clean from the membrane.

Using the Dissolved Oxygen Sensor with other PASCO Sensors:

Some PASCO sensors, including the Dissolved Oxygen Sensor, emit electrical signals into

the test solution and may interfere with other sensors taking simultaneous measurements. If

you want to take simultaneous measurements with the Dissolved Oxygen Sensor and another

PASCO sensor (such as the Conductivity Sensor or pH Sensor), conduct controlled

experiments and ensure that no intra-sensor interference occurs under your experimental

conditions.

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PASCO Specialty & Mfg. PS-2108 User Manual Page 10