SPDT non-latching relay.NO & NC contacts are available. Relay commutates at set point. Contact rating: 5 A at 250 VAC
Zero Buttonallows re-zeroing of sensor output.

  • Model Number: OEM-3
  • Data Sheet: Date Sheet File
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Product Specification


The OEM-3 is a system to control ozone generators and alarms based on an adjustable ozone concentration set point. It is designed to work with user-replaceable sensor modules that are preconfigured for ozone detection ranges of 0-0.1 ppm, 0-1 ppm, and 0-10 ppm. The desired set point is specified when ordering. For example: a 1 ppm OEM-3 would be OEM-3-1, and the replacement ozone sensor module would be OEM-O3-1. The Eco Sensors’ SM-100 may be used to operate the sensor modules remotely at cable lengths  up to 8 m (25 ft).

The OEM-3 incorporates the power supply, final sensor signal processing, set-point controls, analog output signals, and the output relay. The user-replaceable sensor module includes the ozone sensor and its associated electronics in a square, flat board with an edge connector. The sensor module is pre-calibrated in our lab so that the sensor module and OEM-3 work together as a calibrated system. If the sensor module is damaged or loses accuracy, it is simply replaced by another pre-calibrated module.

The controller design incorporates hysteresis and a time delay (set at 8 seconds) to eliminate chatter and other excessive interactions between the sensor and generator. The SPDT relay contacts will handle up to 5 A at 250 VAC. The OEM-3 should not be used outdoors or in the presence of NOx, nitric acid, acid gases, or halogen compound fumes (see Precautions section).


  • SPDT non-latching relay.NO & NC contacts are available. Relay commutates at set point. Contact rating: 5 A at 250 VAC
  • Zero Buttonallows re-zeroing of sensor output.
  • 0-2 V analog voltage outputwhich is a buffered version of the sensor module signal. 1 V represents the calibration point of the sensor module.
  • 4-20mAcurrent outputwhich is proportional to the sensor module’s output. 12 mA represents the calibration point of the sensor module.
  • Driver circuit for an audible alarm, including an acknowledge switch input to silence this alarm. The alarm will turn on again after the ozone level drops below the switch threshold and then rises again.
  • SM-100 extension cables up to 8 mare available for remote mounting of the sensor module

OEM-3 OZONE CONTROLLER Performance Specifications:

Sensor Technology

Electrochemical (EC)

Max Setpoint




Lower Detection Limit

0.03 ppm


0.3 ppm


0.005 ppm




The greater of:

± 20% of reading

or ± 0.03 ppm

The greater of:

± 10% of reading

or ± 0.05 ppm

The greater of:

± 10% of reading or

± 0.2 ppm

Response Time

< 30s TO 50% FS,<180s to 90% FS

Turn-on, turn-off time


8 seconds standard. Other times by request

Relay ratings:

SPDT non-latching. Contacts: 5 A at 250 VAC

Data Update Rate

1 second



Yes [10-40C]


Temperature Range

50 °F to 86 °F (10 °C to 30 °C)

Recommended Humidity


25 - 75% RH

Warm-up Time

1 hour before testing; for best results allow 12 hours before

continued use

Supply Voltage

12-24 VDC or VAC, 250 mA.

Size of board

83 X 83 mm (3.25" X 3.25"). Requires 28 mm (1.125") clearance

from top surface of board and 6 mm (.250") clearance from bottom

surface of the board.

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