
53
pH/ORP
Users can choose between a pH sensor or a combination pH/ORP sensor to measure these parameters. pH describes the acid and
base characteristics of water. A pH of 7.0 is neutral; values below 7 are acidic; values above 7 are alkaline.
The ProSwap Logger measures pH with two electrodes combined in the same probe: one for hydrogen ions and one as a reference.
The sensor is a glass bulb filled with a solution of stable pH (usually 7) and the inside of the glass surface experiences constant
binding of H+ ions. The outside of the bulb is exposed to the sample, where the concentration of hydrogen ions varies. The
resulting differential creates a potential read by the meter versus the stable potential of the reference.
Specifications
pH
Units
pH units
Temperature
Operating
Storage
-5 to +50°C
0 to 60°C
Range
0 to 14 units
Accuracy
±0.1 pH units within ±10°C
of calibration temperature;
±0.2 pH units for entire
temp range
Response
T63<3 sec
Resolution
0.01 units
Sensor Type
Glass combination
electrode
ORP
Units
millivolts
Temperature
Operating
Storage
-5 to +50°C
0 to 60°C
Range
-999 to +999 mV
Accuracy
±20 mV in Redox standard
solution
Response
T63<5 sec
Resolution
0.1 mV
Sensor Type
Platinum button
Guarded
Sensor Tip
Replaceable
Sensor Base
Sensors, Calibration, and Maintenance
4.7