Gas and Specialty Sensors


Product Bar End
Product Bar End


Kele Oxygen Sensor OS-1

Kele Oxygen Sensor


The Kele Model OS-1 Oxygen Sensor is a dependable, economical oxygen sensor designed to monitor oxygen levels in ambient air. The oxygen sensors have a jumper-selectable analog output for interfacing with a BAS controller and an SPDT relay output to activate an alarm in the event of oxygen depletion due to a refrigerant leak. The oxygen monitoring units are powered by 24 volt AC or DC and are housed in a rugged polystyrene enclosure for dust and moisture protection. The Model OS-1 is designed to be used as part of a building automation system or HVAC application for air safety. It helps to prevent the formation of a hazardous environment when properly installed and maintained.


(Wholesale customers, log in for your special pricing)

Please call for product availability


No accessories found
  • 4-20 mA, 0-5 VDC, or 0-10 VDC output, jumper-selectable
  • SPDT alarm relay
  • 24VAC/VDC power
  • 0% to 25% range
  • Rugged polystyrene enclosure

Supply Voltage:24 VAC @ 6 VA or 24 VDC @ 250 mA


Signal Output:(jumper selectable)

4-20 mA (300Ω max):

0-5 VDC (20 kΩ min):

0-10 VDC (20 kΩ min):

Measurement Range:0% to 25% oxygen

Sensing Technology:Galvanic cell

Life Expectancy:Approximately five years @ 68℉ (20°C) in ambient air

Response Time:Approximately 12 seconds

Relay Type:SPDT 24 VAC/VDC @ 0.5A, factory set @ 19.5%

Operating Temperature:40° to 104°F (5° to 40°C)

Operating Humidity:10% to 95% non-condensing

Weight:1.25 lb (0.57 kg)

Warranty:1 year

Download Additional Data

document   OS-1 Catalog Page
document   OS-1 Installation Instructions