GfG ZD 21

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ZD 21 Series

Oxygen Detector

· Extremely stable oxygen (O2) sensor lasts 5 years · Fast response· No influences from pressure, humidity, or temperature

· No damage from carbon dioxide (CO2)

Low cost long-term solution

A particularly long sensor life makes the ZD 21 a low cost transmitter for oxygen monitoring. The expected lifetime of the sensor is 5 years in continuous operation. A robust aluminum casing protects the sensor and the circuitry from impacts, splashed water, and dirt.

Prevention of oxygen deficiency

The ZD 21 is an "intelligent" transmitter. The comprehensive electronics allow for easy operation and maintenance and also increase operational safety and accuracy. In less than 2 seconds the ZD 21 responds to oxygen escaping from a leak. This extremely short response time allows the time to take measures to prevent considerable damage.

Technical Data
Gas Oxygen (O2)	Response time T90 less than 2 seconds
Detection range 0 to 25 volume %	Signal output 0.2 to 1 mA or 4 to 20 mA
Detection principle Zirconia (ZD)	Power supply 10 to 32 VDC / 3 W
Gas supply Diffusion	Ambient temperature -13 to +122°F / -25 to +50°C
Humidity 0 to 99 % r.h.	Expected sensor life Greater than 5 years
Pressure 920 to 1,100 hPA	Casing protection IP 54
Cable gland PG 11	Dimensions 3.94x3.94x2.24 inches (100x100x57) (HxWxD)
Lengths of cable towards controller Up to 300 m (3x0.75 mm cable) More than 300 m (3x1.5 mm cable) shielded cable	Weight .812 lbs. / .37 kg