4210 Flow Meter
Section 4 Optional Equipment
4-22
Figure 4-7 D.O. Parameter Module
4.11.6 Calibrating the D.O.
Probe
1. Prepare the probe as described above (fill the probe cavity
with electrolyte and seat the membrane).
Note
You must use the Isco Temperature Probe with the D.O. Probe
to provide temperature compensation.
2. Wrap both the D.O. Probe and the Temperature Probe in a
damp cloth. Wait ten minutes for them to stabilize, then
proceed.
Table 4-4 D.O. Probe Specifications
Cathode Gold
Anode Silver
Membrane FEP Teflon; 2 mil standard
Electrolyte Half-saturated KCl (Potassium Chloride)
Temp. Range 0 to +45
o
C
Polarizing Voltage 0.8 Volts (Nominal)
Probe Current in Air at 30
°
C 19 microamps (nominal)
Probe Current in Nitrogen at
30
°
C 0.15 microamps or less
Connection 12 ft. (3.2 m) cable with 5-pin male M/S
connector
Response Time Typical response for dissolved oxygen,
using supplied membranes, is 90% in 20
seconds. Response at low dissolved oxy-
gen levels is typically 90% in 60 seconds.
To Next Page
Loading...
