S-900 : Transmitter and Controller

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Product Overview

Aero-Qual Gas Monitoring

The Series 900 Fixed Ozone Gas Detector is a flexible monitor compatible with 4 ranges of ozone sensor as well as a temperature and humidity sensor, if required. It is designed to measure and control ozone concentrations and communicate to a variety of hardware systems. The monitor can operate in three ways:

  1. As a relay controller with user configured set points to control an external device such as an ozone generator or initiate an alarm.
  2. As an ozone transmitter via the 4-20 mA output which allows connection to a PLC or current sensing device to provide ozone concentration information for applications such as health and safety monitoring.
  3. As an ozone network via the RS485 digital output to enable ozone monitoring at several indoor locations with information being logged to a central point.

The S900 Ozone Gas Detector is lightweight, discrete and easily wall mountable. It requires a 12V power supply which is user configured to allow flexibility in the locations it can be installed. The sensor heads are simple to replace and can be sent back to Aeroqual for recalibration. The sensor heads available with the S900 Fixed Ozone Monitor can be found under the sensors tab.

There is also free to download configuration and networking software available under the downloads tab. The configuration software allows for quick and easy configuration of the alarm and control setpoints. The networking software can be used to log data from a network of monitors to a single PC.

Monitor Quick Comparison: 
Portable: No 
Range: Multiple 
Display: None 
Alarm: Relays 
Outputs: Multiple 
Datalogging: No 
Indoor / Outdoor: Indoor

Optional Accessories Description
DL-2 Datalloger Kit 4-20mA The DL-2 Datalogger easily stores up to 43,000 datapoints! Data is instantly & quickly transferred to the computer with included USB Cable & Windows XP compatible software.
R-20 Control Relay Easy on/off ozone generator or alarm control
RS485 to USB Converter Serial RS 485 to USB Converter for connecting S900, S930, S940, SM70, to PC


  • Low and high alarm signals with control diagnostics
  • Outputs include 4-20 mA, RS-485 and relays
  • Multiple sensor ranges available
  • Optional Temperature and Relative Humidity Sensor (order as S-905)
  • Can utilize sensor heads for other ranges and gases
  • Consider: Wall-Mount. Range: Multiple. Display: None. Outputs: Multiple.
 More Information
Weight 0.44 lbs (0.19 kg)
Electrical 12 VDC (User Supplied - no adapter included) 0.8 A
Dimensions 2.5 x 5 x 5 inches (6.4 x 12.7 x 12.7 cm)
Warranty 1 Years
Display None
Temperature Range 23 to 122°F (-5 to 50°C)
Supporting Documents User Manual and NIST Traceable Calibration Sheet included
Alarm Relays - 2 alarms (2 alarm setpoints for Low and High Alarm)
Humidity Range 0 to 95%
Internal Datalogging Yes
Display Units None
Communication Protocol RS-485
Relays 1

S-900 Specifications S-900 User Guide Available Sensors
S-900 Specifications S-900 User Guide S-900 User Guide


Warranty Information

Seller warrants that all Products will conform to the Specifications and will be free from defects in material workmanship and programming. Claims for Products not complying with this warranty shall be submitted by Buyer no later than 12 months from delivery date to Buyer. Seller shall promptly repair or replace, at its option and expense, non-complying Products. The shipment of non-complying Products by Buyer to Seller, and the return shipment of repaired or replacement Products by Seller to Buyer shall be at Seller's expense, unless it shall be determined that Buyer returned a Product that was in compliance, in which case such cost shall be borne by Buyer and, if paid by Seller, these expenses shall be reimbursed by Buyer within thirty (30) days of notice by Seller. Buyer shall receive a credit for any non-complying Products returned for repair or replacement. All non-complying Products shall be returned to Seller (at its offices or as otherwise instructed) no later than 30 days as of the date the non-compliance of any such Product has been discovered. Seller is NOT responsible for any/all damages suffered to the Products that is caused by the Buyer. Such as but not limited to damage by wrong electrical current, damage through crush or dropping the product, damage through untrained users of Product, damage through improper operations.