| Oxygen-sensor for O2-measurements
in liquids  The amperometric
oxygen-sensor with integrated NTC temperature sensor is used for measuring the soluted
oxygen in liquids. The amount of soluted oxygen depends on the medium temperature and the
actual atmospheric pressure.
The sensor consists of a 2-electrode measuring cell acc. to Clark with an operational
electrode and a counter electrode. Both electrodes are in an electrolyte system, which is
separated from the probe by a gas-permeable membrane. The working electrode reduces the
oxygen-molecule to hydroxide-ions. During this electrochemical reaction there is a current
from the counter electrode to the operational electrode, which is a measure for the
oxygen-concentration within the solution to be measured.
| Specifications for FY A640-O2 |
| Mearusing range |
O2-concentration: 0,0 … 40,0
mg/l (ati 0 … 40°C)
O2-saturation: 0 … 260% (temperature-compensated for 5
… 50°C)
temperature: –5,00 … 50,00°C |
| Electrodes |
operational electrode: Pt, counter electrode: Ag/AgCl |
| Membrane |
Teflon, changeable cap of plexiglass |
| Shaft |
PVC, length 155 mm, Ø 12 mm |
| Operating temperature |
-5 … 50°C |
| Nominal temperature |
25°C |
| Pressure compensation |
by manual entry or additional sensor for atmospheric pressure
FD A612 MA |
| Response time t90% |
90% final displayed value approx. 10-15 s |
| Zero current |
free of zero current (< 2nA) |
| Measurement current |
approx. 700 nA (at O2-saturation) |
| Accuracy |
± 1% of meas. value, ± 1% of final value (at nominal
temperature) |
| Speed of in-flow |
approx. 10 cm/s |
| Storage temperature |
-10 to 50°C |
| Immersion depth |
30 mm |
| Filling volume (electrolyte) |
0.6 ml |
| Voltage of polarisation |
650 mV |
| Operation time |
several months with one electrode filling |
| Total lifetime |
several years (depending on application) |
| Order No. |
Description |
| FY A640-O2 |
O2 sensor for measurement in liquids with 20 ml
solution in PE bottle for filling the electrode and 1.5 m ALMEMO®-cable |
| Accessories |
| ZB 9640 AS |
Alignment set consisting of: vessel for alignment of
saturation, 25 g sodium sulfide in 20 ml-PE-bottle for preparing the zero solution |
| ZB 9640 NL |
20 ml solution in PE-bottle for refilling the O2-sensor |
| ZB 9640 EM |
Membrane cap with protection for replacement (2 pieces in
lock-up bag) |
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