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ZD 21 for oxygen
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| Description | Detection range | Signal output | Part No. | |
| Oxygen, built-in sensor | O2 | 25 Vol % | 0,2 .. 1 mA | 2210004 |
| Oxygen, built-in sensor | O2 | 25 Vol % | 4 .. 20 mA | 2210009 |
| Oxygen, external sensor | O2 | 25 Vol % | 0,2 .. 1 mA | 2210014 |
| Oxygen, external sensor | O2 | 25 Vol % | 4 .. 20 mA | 2210019 |