Comparison of Metrohm pH and pH/ion meters for field, laboratory and plant

pH meter	826 pH mobile	827 pH lab	780 pH Meter	781 pH/Ion Meter
Measurement ranges:
pH	pH 0…14 (-8…22)	pH 0…14 (-8…22)	pH 0...14 (±20.000)	pH 0...14 (±20.000)
mV	±1200 mV	±1200 mV	±2200 mV	±2200 mV
Temperature °C	Pt1000 -150...+250 NTC –5…+250	Pt1000 -150...+250 NTC –5…+250	Pt1000 -50...+250°C NTC -20 ... +250	Pt1000 -50 ...+250°C NTC -20 ... +250
Concentration	-	-	-	1E-38...1E+38
Resolution:
pH	0.001 pH	0.001 pH	0.001 pH	0.001 pH
Potential	0.1 mV	0.1 mV	0.1 mV	0.1 mV
Temperature	0.1 °C	0.1 °C	0.1 °C	0.1 °C
pH calibration (number of buffers)	1 to 3	1 to 3	1 to 9	1 to 9
Automatic consideration of the temperature behavior of the stored buffer solutions	Yes	Yes	Yes	Yes
Automatic buffer recognition	Yes (Metrohm, Precisa, NIST, DIN, Fisher, Fluka, Mettler, Merck Titrisol®, Merck Certipur®, Beckman, Radiometer, Baker, Hamilton)	Yes (Metrohm, Precisa, NIST, DIN, Fisher, Fluka, Mettler, Merck Titrisol®, Merck Certipur®, Beckman, Radiometer, Baker, Hamilton)	Yes (Metrohm, Precisa, NIST, DIN, Fisher, Fluka, Mettler, Merck Titrisol®, Merck Certipur®, Beckman, Radiometer, Baker, Hamilton)	Yes (Metrohm, Precisa, NIST, DIN, Fisher, Fluka, Mettler, Merck Titrisol®, Merck Certipur®, Beckman, Radiometer, Baker, Hamilton)
Storage of calibration data with curve	Data only	Data only	Yes	Yes
Automatic temperature compensation	NTC/Pt1000	NTC/Pt1000	NTC/Pt1000	NTC/Pt1000
Automatic electrode test	-	-	for aqueous, non-aqueous and gel electrodes	for aqueous, non-aqueous and gel electrodes
Automatic standard addition with Dosimat	-	-	-	Yes
Stability check (drift display)	Yes	Yes	Yes	Yes
Simultaneous display of pH and temperature	Yes	Yes	Yes	Yes
Electrode inputs (high impedance)	1	1	1	1
Ipol electrode input (KF & wine analysis)	-	-	-	-
Method/result memory	-/Yes	-/Yes	Yes/Yes	Yes/Yes
Result printout conforming to GLP/ISO	Yes	Yes	Yes	Yes
Plot function for pH/mV/temp versus time	-	-	Yes	Yes
Printer/PC connection	IrDA	IrDA	RS232	RS232
Remote stirrer control	-	-	Yes	Yes
Sample changer connection «Remote»	-	-	Option	Option
Output lines for limit value contacts	-	-	Option	Option
Analog output	-	-	-	-
Dialog guidance	E	E	E, G, F, Sp	E, G, F, Sp
Line operation with 100/115/220 V, 50/60 Hz	battery only	Yes	Yes	Yes
pH meter	826 pH mobile	827 pH lab	780 pH Meter	781 pH/Ion Meter

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