GfG DynaGard 25 O2

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Dynagard 25 Series Single Point Fixed O₂ Monitoring System

· Easy installation

· Local display and horn / strobe

· Adjustable alarm points

· On-board relays for external controls

· 4-20 mA output

Simple and Effective

The Dynagard 25 Series accurately measures oxygen levels. The unit offers a local display, a horn / strobe, and a linear 4-20 mA output. The Dynagard 25 Series offers a safe and reliable gas warning system.

Alarm Points

Each alarm can be adjusted separately. The alarm point values can be freely adjusted within the detection range of the transmitter. Every alarm point value can be set to over range / under range, latching / non-latching, or resettable / non-resettable.

Alarm Relays

The controller provides four voltage-free relays for the three alarms and one fault warning. The relays may be used to control additional alarm devices like lights or horns. They can even prompt specific counter measures to prevent or limit dangers from gases or vapors.

ZD 21 Zirconia Sensor
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 an oxygen deficiency. The sensor has a platinum coating on the inside and outside of the ceramic cylinder. Oxygen is electrochemically reduced at the cathode.
The voltage produced is proportional to the next difference in the partial pressures of oxygen in the reference gas versus the sampled gas. This extremely short response time allows the user the time to take measures to prevent consideable damage.

Technical Data
Gases Oxygen (O2)	Alarms 3 alarm points User adjustable within the detection range
Detection range 0-25% volume	Alarm Functions Available Over range / under range Latching / non-latching Resettable / non-resettable Hysteresis adjustable Delay-time 0 to 2 minutes Alarm thresholds adjustable
Detection principal Zirconia oxide
Expected sensor life 5 years +
Gas supply Diffusion	Relays 3 alarm points, 1 fault – voltage free Factory settings A1 - strobe A2 - open A3 - horn Fault - open Voltage: 250 VAC 50/60 Hz or 250 VDC maximum
Humidity 0 to 99 %r.h. non-condensing
Temperature range 32 to +122°F / 0 to +55°C
Pressure 920 to 1,100 hPA	Output signal Linear 4-20 mA
Power supply 24 VDC wall pack	Horn Low - 70 dB at 10 ft. per UL 464 High - 83 dB at 10 ft. per UL 464
Weight 6.5 lbs. (2.95 kg)	Strobe Light output on axis (cd) Low - 35 High - 68
Display 3-digit LED display for linear measurement values, service 1 LED green – operational status 1 LED yellow – fault 3 LEDs red – alarm Display of maximum / minimum values	Dimensions 11x7x2.75 inches (27.9x17.8x7 cm) (HxWxD)