The Pocket Colorimeter™ II or DR300 came with glass and plastic sample cells. Which ones should be used?

Document ID

Document ID TE500

Published Date

Published Date 12/19/2019
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Question
The Pocket Colorimeter™ II or DR300 came with glass and plastic sample cells. Which ones should be used?
Summary
Sample cells for Pocket Colorimeter II and DR300
Answer

The different sample cells correspond to different concentration ranges in the instrument. Many Pocket Colorimeters have a low and high range. For example, the DR300 for Chlorine (Product # LPV445.97.00110) measures chlorine in a low range mode from 0.02 - 2.00 mg/L Cl2, and in a high range mode from 0.1 - 8.0 mg/L Cl2.

The step-by-step procedure is different for the low vs. high range.
  • Glass sample cells should be used when measuring in the low range mode
  • Plastic cells should be used when measuring in the high range mode.
If using the Pocket Colorimeter II for pH and Chlorine, use the glass sample cells when measuring pH and the plastic cells when measuring chlorine. The plastic cells have a shorter pathlength, and the calibration is different when glass vs. plastic cells are used. If a glass cell is used for a range that is calibrated with a plastic sample cell, the readings will be erroneously high.

Note: The plastic cell used with older model Pocket Colorimeters will not fit correctly in the Pocket Colorimeter II or DR300. Use Sample Cell: 1" Round Plastic 10 mL with 1cm Pathlength (Product #4864302) with the Pocket Colorimeter II and DR300.

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