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Comparison of the 780 pH Meter and the 781 pH/Ion Meter

 

 

780 pH Meter

 

781 pH/Ion Meter
Measuring ranges
pH
Potential
Temperature
- Pt 1000
- NTC
Concentration
0...14 (±20.000)
±2200 mV

-150.0...+250.0 °C
-20.0...+250.0 °C
0...14(±20.000)
±2200 mV

-150.0...+250.0 °C
-20.0...+250.0 °C
10-38 ... 10+38
Resolution
pH
Potential
Temperature
0.001
0.1 mV
0.1 °C
0.001
0.1 mV
0.1 °C
Concentration mode
Automatic calibration curve with Dosimat
Automatic standard addition with Dosimat
--
--
X
X
 
pH calibration (number of buffers)  
1 to 9
 
1 to 9
Automatic adjustment for the temperature characteristics of the stored buffer solutions  
X
 
X
Automatic buffer recognition  
X
 
X
Automatic temperature compensation  
X
 
X
Automatic self-diagnosis  
X
 
X
Automatic electrode test
for different types of pH electrodes
 
X
 
X
Stability control (drift indicator)  
X
 
X
Simultaneous display of pH and temperature  
X
 
X
Electrode input (high impedance)  
1
 
1
Temperature measuring input
for Pt 1000 and NTC
 
X
 
X
Method storage  
X
 
X
Result storage (including additional data)  
100 measured values
 
100 measured values
GLP-compliant result printout  
X
 
X
Automatic monitoring functions  
validation, service, calibration, diagnosis
 
validation, service, calibration, diagnosis
User identification and field for signature on report  
X
 
X
Plot function (versus time)  
pH, mV, °C
 
pH, mV, °C, concentration
Output lines for limit value contacts  
Option
 
Option
Dialog guidance in the following languages  
English, German, French, Spanish
 
English, German, French, Spanish
Connections  
 
RS 232C  
printer or PC
 
printer or PC
MSB (Metrohm Serial Bus)  
X
 
X
for stirrer control  
X
 
X
for PC keyboard and barcode reader  
X
 
X
"Remote" sample changer  
Option
 
Option
Power supply  
100...240 V, 50...60 Hz
 
100...240 V, 50...60 Hz
         
   

780 pH Meter

 

781 pH/Ion Meter

 
   
Analytical instruments in Swiss quality