What can be done to adjust the DRB 200 temperature test when the value is off from 150 °C?

Document ID

Document ID TE668

Published Date

Published Date 05/03/2018
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Question
What can be done to adjust the DRB 200 temperature test when the value is off from 150 °C?
Summary
DRB 200 reactor will not pass the instrument temperature test.
Answer
The typical accuracy is +/- 2C. The most common reason for a DRB 200 reactor to measure high (153-155 C) is that the reactor has not reached equilibrium. When the reactor starts heating towards the set temperature, it will initially overshoot the temperature by about 2 C and then cool down to set point. The reactor should be allowed to heat at 150 C for 30 minutes and then the reactor will pass this test.

The operater can create a custom user program by telling the instrument to heat higher or lower than the required temperature so that the instrument reaches the desired temperature. For example, if the reactor stabilizes at 146 C when set to 150 C, the operater could create a custom program that heats to 154 C so that it will stabalize at 150 C (doing this may take some trial and error). The operator should not attempt any other temperature adjust on the DRB 200, since a mistake can damage the unit (while doing the alternate procedure is harmless). Calibration should be performed annually by a Hach authorized service technician.

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