Pr o Minent

8 Operating Menu / DescriptionPermanent displays7.20750pHmVvalue 1value 2stop-key7.20 pH750 mVvalue 1 7.00 pHset point 7.20 pHctrlout 0 %value 2 750 mVset point 750 mVctrlout 0 %The permanent displays 1 to 4 serve information on fault messages/causes (see also table on page 24) aswell as on operating values/settings.CalibrationCalibration of pH probe:The calibration of the pH probe uses a two-point calibration method (zero point, slope). As buffer pH 7 (zeropoint calibration) and pH 4 (slope calibration) are factory-set. If other buffers are to be used, the defaults inthe complete operating menu (menu A, B) may be altered. During calibration control is stopped andmetering is reduced to the set base load. The output 0/4...20 mA (measuring value) will be frozen. Aftersuccessful calibration, all fault determinations relating to the measuring value are started again. The currentprobe data (zero point/slope) will be displayed.Acalibration?calibration pHzero p.: -3.1 mVslope at 25 °C58.32 mV/pHcalibration pHbuffer 1: 7.00 pHmea. val: 7.00 pHsignal: -3.1 mVcalibration pHprobe in bufferbuffer: 7.00 pHcalibration pHcalib. 1 activeplease wait!-3.1 mVcalibration pHbuffer 2: 4.00 pHmea. val: 4.00 pHsignal: 157 mVcalibration pHprobe in bufferbuffer: 4.00 pHcalibration pHcalib. 2 activeplease wait!157 mVcalibration pHzero p.: -3.1 mVslope at 25 °C53.70 mV/pHBPossible valuesInitial value Increment Lower value Upper value RemarksBuffer values pH 7 pH 0.01 pH -2 pH 16 Error messages when both bufferspH 4too close (