pH Sensor Sample Clauses

pH Sensor. 3.7.1 Select the 3-point option to calibrate the pH probe using three calibration standards. In this procedure, the pH sensor is calibrated with a pH 7 buffer and two additional buffers (ideally pH buffers of ~4 and ~10). 3.7.2 Pour the correct amount of pH buffer in a clean and dry or pre-rinsed calibration cup, making sure the sensor’s glass bulb is in solution by at least 1cm. Allow at least 1 minute for temperature equilibration before proceeding. 3.7.3 Calibrate"-> " pH or pH/ORP" -> "pH". 3.7.4 Select the number of points desired for the calibration. Enter the value(s) of the pH buffer(s) that will be used for the calibration. 3.7.5 Observe the temperature reading above the standard value. The actual pH value of all buffers varies with temperature. Enter the correct value from the bottle label for your calibration temperature for maximum accuracy. For example, the pH of one manufacturer’s pH 7 Buffer is 6.994 at 25˚C, but 7.012 at 20˚C. 3.7.6 Click Start Calibration. 3.7.7 Observe the readings under Current and Pending data points and when they are Stable (or data shows no significant change for approximately 40 seconds), click Apply to accept this calibration point. 3.7.8 Confirm that the Pending data value is close to the Set Point value. 3.7.9 Click Proceed and wait for the software to prompt you to move the sensor to the next standard solution. 3.7.10 Rinse the sensor in deionized water. If possible, rinse sensor with extra pH buffer solution to avoid dilution of the next buffer solution. Pour the correct amount of an additional pH buffer standard into a clean, dry or pre-rinsed calibration cup, and carefully immerse the probe end of the sonde into the solution. Allow at least 1 minute for temperature equilibration before proceeding. 3.7.11 Repeat the calibration procedure and click Apply when the data are stable. Rinse the sensor and pour additional pH buffer, if necessary. Repeat calibration procedure for the third point and click Apply when data are stable.