Instruction Manuals - Cole-Parmer

Instruction Manual pH 1100/ 21003 PH CALIBRATION & MEASUREMENT3.1 pH calibrationThis meter is capable of up to 5 point calibration with selectable buffer sets (USA, NIST, Bf1, Bf2 or any 5 custom buffersof your choice). The meter retains stored pH calibrations even when turned off. For best accuracy, we recommend thatyou perform at least a 2-point calibration using buffers that bracket (one above and one below) the expected samplerange. A single point cal is possible only at the offset points namely 7.00 or 6.86. For custom buffer sets, you mustperform at least a 2 point calibration.Selectable buffer sets:USA: 1.68, 4.01, 7.00, 10.01, 12.45NIST: 1.68, 4.01, 6.86, 9.18, 12.45Bf1: 1.68, 4.01, 7.00, 9.18, 12.45Bf2: 1.68, 4.01, 6.86, 10.01, 12.45Any 5 user selected custom buffersTo select which buffer sets you wish to use see Section 10.2.2: Program pH Buffer Setup: P1.0 in the pH/Temp setupmode (page 30).When you recalibrate your meter, old pH calibration points are replaced on a point by point basis. For example, if youpreviously calibrated your meter at pH 4.01, 7.00, and 10.01, and you recalibrate at pH 7.00, the meter retains the oldcalibration data at pH 4.01 and pH 10.01. To view current calibration points, see Section 10.2.8: Program pH Cal DataP1.6 in the pH/Temp setup mode (page 35).If you choose to recalibrate to only 1 or 2 pH values, the older calibration values you do not calibrate to will remain stored.These old stored calibration values may cause accuracy loss when your readings are close to the old values. To clear oldcalibration data, reset the meter as shown in Section 10.2.9 Program pH Cal Reset: P1.7 in the pH/Temp setup mode(page 36).3.1.1 Automatic Temperature Compensation (ATC)If you will be taking pH measurement using Automatic TemperatureCompensation (ATC), you must perform your pH calibration withATC temperature probe attached. Attach the temperature probe tothe rear of the meter. The ATC mode annunciator shows on thedisplay. See Figure 11. Insert the probe into the pH buffer solutionalong with your pH electrode.If manual temperature compensation is preferred, do not plug atemperature probe into the meter. The MTC mode annunciatorshows on the display. See Figure 12. The default manualtemperature compensation is 25.0°C. To change the manualtemperature compensation default, see Section 9 TemperatureCalibration for instructions (page 26).7.179pH 25.3°C ATCJan 18 2002 08:46:25Figure 117.179pH 25.3°C MTCJan 18 2002 08:46:25Figure 1211