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_ _ _ —=Environmenta <br /> 4. Record temperature value for the sample from the bottom scale of the meter display <br /> in degrees Celsius. Allow time for the probe temperature to equilibrate with that of <br /> the sample solution before reading. Record the temperature value on the field data <br /> sheet and/or in the bound field logbook, as applicable. <br /> The YSI Model 33 meter has been factory-calibrated for temperature. The probe contains a <br /> precision thermistor temperature sensor of +0.1 degrees Celsius and +0.3 degrees Celsius at 40 <br /> degrees Celsius. Quarterly, check the meter against a National Institute of Standards and <br /> Technology-certified field laboratory thermometer. Agreement should by within 0.5 degrees <br /> Celsius. <br /> CONDUCTIVITY MEASUREMENT <br /> Probe Calibration Procedure <br /> At the beginning of each day, calibrate the conductivity cell (probe) and the meter together as a <br /> system to achieve maximum measurement accuracy in the field. The following method applies <br /> to the YSI Model 33 meter. If another meter is used, refer to manufacturer's directions. <br /> Calibration of the probe and meter shall be accomplished using certified YSI Conductivity <br /> Calibrator Solution #3161, #3163, or equivalent certified calibrator solution. The YSI Model 33 <br /> meter shall be calibrated as follows: <br /> 1. Select a glass or plastic container several inches taller than the probe and at least 2- <br /> inches greater in diameter. Clean this container with DS/DI water and dry with a <br /> clean cloth or paper towel. <br /> • <br /> CO2127 <br />