I would like to commend Ozone Solutions for their quality workmanship and superior customer service. Ozone Solutions provided us with a well-designed ozone sparge system with plenty of room inside to move around and perform the operation and maintenance on the ozone system. You were extremely helpful during the engineering, planning, and building process...

Phone: (712) 439-6880
Hours: 8 AM - 5 PM Central Time

OS-4: High Range Ozone Monitor

Ozone Monitor with Remote Sensor


  • Easy to install
  • Pre-calibrated, replaceable sensor chip
  • User-adjustable relays for ozone control
  • Consider: Wall-Mount. Range: 0 - 20 ppm. Display: LCD. Outputs: Analog, Digital, Relays.

(See Full Specifications)

OS-4X $755.00
Stock: In Stock

Buy Options:


add International Plug Adapter for $30.00 (More Info)
add DL-SC-3 Datalogger and Software for $250.00 (More Info)
add RAP-2 Strobe/Alarm for $500.00 (More Info)
add EE-2 Protective Sensor Enclosure for $250.00 (More Info)
add R-25 Control Relay for $225.00 (More Info)


The OS-4 ozone monitor has a range of 0.03-20.0 PPM and a remotely-mounted sensor that can be up to 100 meters (390 ft) away from the sensor base*. Relay contacts enable action at any user-defined set-point (up to 20 ppm), and a variety of outputs allow connection to data loggers, PLC's, or building-monitoring systems. Digital display of ozone level. Simple and inexpensive.

Monitor Quick Comparison:
Portable: No
Range: 0.03-20.00 ppm
Display: LCD
Alarm: No
Outputs: Yes
Datalogging: No
Indoor/Outdoor: Indoor

*Longer cable lengths possible, depending on cable quality, electrical interference and environment. E-mail for details.

Optional AccessoriesDescription
International Plug Adapter220V/50Hz Power Option necessary for overseas use.
DL-SC-3 Datalogger and SoftwareEcosensors data logging data cable bundle and ecosensors datalogging software for RS-232 transmitting SMX/SM-EC sensors.
RAP-2 Strobe/Alarm The RAP-2 Remote Alarm Panel is for alarming when signals from ozone monitors or an ozone sensor reaches a preset limit or set-point.
EE-2 Protective EnclosureAdd Protection to your ozone sensor with the dust and water proof enclosure.
R-25 Control Relay R-25 Relay provides the heavy duty relay necessary for ozone generator or alarm control when using an Eco-Sensors ozone sensor.


Range 0.03 - 20 ppm (30 - 20000 ppb)
Accuracy 10 to 15%
Resolution 0.01 ppm (10 ppb)
Display Units ppm
Response Time 1 minute
Detection Method HMOS
Display Digital and LED indicator
Alarm Visual Panel LED
Internal Datalogging no
Analog Outputs
0 - 2 VDC, 4 - 20 mA,
Communication Protocol RS-232
Temperature Range 32 to 104°F (0.0 to 40°C)
Humidity Range 0 to 80%

Native Power

8 - 24 VDC 0.3 A

Included Option

120 VAC 60 Hz Adapter

Available Option

220 VAC 50 Hz Adapter
Dimensions 5 x 2.5 x 1.5 inches (12.7 x 6.4 x 3.8 cm)
Weight 0.44 lbs (0.2 kg)
= 1.946097 N
= 0.4375 lb
= 0.198447 kg
= 198.446661 g
= 198,446.661194 mg
= 7 oz
Supporting Documents User Manual and NIST Traceable Calibration Sheet included
Warranty 1 Years
Multi-Gas Capable no
Relays 2

How It Works

Last Updated: April 6, 2015

The above information is from and is copyrighted by Ozone Solutions Inc.
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8 AM - 5 PM Central Time
Phone: (712) 439-6880
Toll Free: (888) 892-0303 (USA Only)
Fax: (712) 439-6733