TOM-2 Total Oxidizer Monitoring & Mitigation

The TOM-2 Total Oxidizer Monitoring & Mitigation system (patent pending) from EMS Healthcare LLC is designed for the continuous regulation of oxygen below the limit of 23.6 percent in combined-use vacuum systems. The heart of the monitoring & mitigation system is a PLC that interfaces to an oxygen sensor, a vacuum transducer, and a control valve. The unit monitors oxygen concentration and vacuum pressure and takes appropriate action based on these input parameters. The PLC operates a valve plumbed to a regulated gas source (e.g., carbon dioxide or nitrogen) or ambient air to maintain levels below the critical threshold of 23.6%. Maintaining system vacuum pressure is always prioritized over oxygen levels; as long as vacuum pressure remains acceptable, increasing oxygen levels to the vacuum pump inlet will be mitigated.

The TOM-2 is recommended for use in all healthcare facilities where oxygen from patient procedures is evacuated through oil-lubricated vacuum pumps. The TOM-2 continuously monitors and logs total oxygen concentration in order to provide periodic reports for compliance purposes.

Download additional documentation below.



  • Oxygen concentration monitoring from 0% to 95%
  • Oxygen alarm at 23.6% (NC contacts open on alarm)
  • Oxygen mitigation using ambient air, nitrogen or CO2
  • Vacuum pressure override to prioritize patient vacuum levels over oxygen mitigation
  • Continuous data logging of oxygen concentration, vacuum pressure, and mitigation operation
  • Statistics tracking of minimum/maximum levels for oxygen and vacuum pressure, number of mitigation cycles
  • System fault monitoring

General Specifications

Performance Specifications
  • Sensor Type: Long Life Zirconium Oxide Sensor Cell 0-95%
  • Response Time: Within 1 second of any change in oxidizer levels
  • Accuracy: ± 0.5% of FS
  • Repeatability: ± 1% of reading
  • Operating Temp: -40° to 122°F (-40° to +50°C)
  • Humidity: 0 – 98% RH, non-condensing
Signal Outputs
  • Local Display: Touchscreen indicating O2 concentration, vacuum pressure, and alarm indication
  • Alarm Output: 2-wire dry contact, normally open relay commanded closed during normal operation (open on alarm of 23.6% O2 or loss of power)

Electrical Requirements
  • Power: 120VAC external power, 23 watts maximum

Physical Characteristics
  • Dimensions: 8" (W) x 12" (H) x 6" (D) inches
  • Weight: 10.0 pounds (4.5 kg) including sensors and solenoid valve
  • Enclosure Type: NEMA 1, 2, 3, 4, 4X rated

PDF Downloads

TOM-2 Cut Sheet Rev E
TOM-2095B Operators Manual Rev ETOM-2095M Operators Manual Rev OD