Teledyne 4220 D.O. Probe Specifications, Calibrating the D.O. Probe with a Flow Meter

4220 Flow Meter

Section 5 Options and Accessories

	probe. Use only 2-mil membranes with D.O. probes
	connected to Isco flow meters.
Table 5-4 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° 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 connec-
		tor
Response Time		Typical response for dissolved oxygen, using
		supplied membranes, is 90% in 20 seconds.
		Response at low dissolved oxygen levels is typ-
		ically 90% in 60 seconds.

Figure 5-6 D.O. Parameter Module

5.10.6Calibrating the D.O. Probe with a Flow Meter

You must use the Isco 270 D.O. Module box between the probe and flow meter; this extends the distance between the probe and the flow meter to 1,000 feet.

Prepare the probe as described above if this has not already been done (fill the probe cavity with electrolyte and seat the mem- brane).

5-22