A pH electrode that is properly manufactured and kept clean will retain its measuring integrity for quite a long time.
The most common cause for pH measurement inaccuracies is an unclean or improperly cleaned electrode. This is very important to note because, during calibration, the instrument assumes that the electrode is clean and that the standardization curve created during the calibration process will remain a valid reference until the next calibration.
pH meters on the market today will allow an offset of approximately +/-60 mV. The deviation from 0 mV is not unusual, in fact it represents the true characteristics of the pH electrode. The deviation from 0 mV becomes a problem if it is the result of calibrating a dirty electrode.
HI 221 & HI 223 compare the characteristics of the pH electrode from one calibration to the next. In case of large variances in the electrode condition that can only be the result of a soiled sensor, these meters alert the user that the electrode needs to be properly cleaned prior to calibration and measuring.
Range pH -2.00 to 16.00 pH; -2.000 to 16.000 pH Range mV +/-699.9 mV; +/-2000 mV Range Temperature -20.0 to 120.0C Resolution pH 0.01 pH; 0.001 pH Resolution mV 0.1 (+/-999.9 mV); 1 (+/-2000 mV) Resolution Temperature 0.1C Accuracy pH +/-0.01 pH;+/-0.002 pH Accuracy mV +/-0.2 (+/-699.9 mV); +/-0.5 (+/-999.9 mV); +/-1 (+/-2000 mV) Accuracy Temperature +/-0.4C Calibration Check status of electrode condition and response time,
status of the buffer solution during calibration pH Calibration automatic, up to 5 points with 7 memorized values
(pH 1.68, 4.01, 6.86, 7.01, 9.18, 10.01, 12.45) Temperature Compensation manual or automatic, -20.0 to -120.0C (-4 to 248F) pH Electrode HI 1131B, glass-body, double junction, refillable,
BNC connector, 1 m (3.3') cable (included) Temperature Probe HI 7669/2W with 1 m (3.3') cable (included) PC Connection RS232 opto-isolated serial port Data Logging 500 samples Input Impedance 1012 Ohm Power Supply 12 Vdc adapter (included) Environment 0 to 50C (32 to 122F); RH max 95% Dimensions 240 x 182 x 74 mm (9.4 x 7.2 x 2.9") Weight 1.1 kg (2.4 lb.)
HI 223 is supplied with HI 1131P refillable pH electrode (glass-body, BNC & Pin with 1m cable), HI 7669/2W stainless steel temperature probe, HI 76404 electrode holder, pH 4 and pH 7 buffer sachets, electrode refilling solution, 12 Vdc power adapter and instructions
Whenever your requirements demand the highest quality pH meter, rest assured that The Lab Depot has you covered. As with any laboratory supplies and lab equipment, always look to The Lab Depot for the best value. We are your source for over 750,000 products, in addition to the Hanna pH meter, and all of our lab equipment is covered by excellent warranties.
1.800.733.2522
