pg
|
21
2.9
pH and ORP
Sensor Overview
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. ORP designates the oxidizing-reducing potential of a water sample and is useful for
water which contains a high concentration of redox-active species, such as the salts of many metals and strong
oxidizing (chlorine) and reducing (sulfite ion) agents. However, ORP is a non-specific measurement—the
measured potential is reflective of a combination of the effects of all the dissolved species in the medium.
Users should be careful not to overinterpret ORP data unless specific information about the site is known.
1.9
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
(see pg 12)
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
(see pg 12)
Resolution
0.1 mV
Sensor Type
Platinum button
(continued)
EXOISE1, EXOISE2,
EXOISE5, EXOISE6,
599795, 599797
