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VOXI Fixed VOC Monitor

Professional gas detection and alarm systems


The VOXI series of fixed transmitters utilize photo-ionization detection (PID) technology to monitor volatile organic compounds (VOCs) at resolutions of 1 ppb with the MP812 and 10 ppb with the MP815. A built-in heater prevents the condensation of moisture in the transmitter under high-humidity conditions. Innovative designs of the ultraviolet (UV) 10.6 eV lamp and electrometer reduce contamination, producing more accurate and stable readings and extending maintenance intervals. Mobile apps and a Bluetooth controller make on-site configuration, testing and trouble-shooting easy and handy. The OLED display is visible from a distance even under strong lighting, while data and alarms are continuously sent to a controller wirelessly or via cables. Major applications include VOC emission monitoring around petrochemical plants, manufacturing and processing facilities.


  • Fast response t90 < 5s
  • Wide range of operation -40°C to +70°C
  • 1 ppb VOC resolution
  • Auto ranging & zeroing
  • Built-in heater to prevent condensation
  • Innovative PID for performance & long life
  • Easy access to clean sensor and lamp
  • OLED display for maximum visibility outdoors
  • 450 Correction Factors
  • 4-20mA, Modbus communication protocol
  • 3 relays and output to strobes and horns
  • Mobile apps and Bluetooth controller for handy configuration and testing
  • VOC emission monitoring

Transmitter Specifications

Size 8.39 x 7.09 x 5.00 in (213 × 180 x 127mm)
Weight 3.3 lbs (1.5 kg)
Temperature -40°C to +70°C
Humidity 0 to 100% RH
Sensor 10.6eV Photo-ionization Detection (PID)
Gases Volatile Organic Compounds (VOCs): benzene, toluene, ethers, esters, alcohols, solvents, fuels, fumigants, ammonia, etc.
Ranges, accuracies & response 0.001-200ppm ±2% full scale (MP812)
0.01-5,000ppm ±5% full scale (MP815)
Auto-ranging 4-digit display
Response time t90 < 5 sec
Sampling Diaphragm pump at 250 cc/min up to 100 ft.
Power <5W, 12-30 VDC
Outputs Analog: 4-20mA (3 wires)
Digital: RS-485, CAN or ModBus
3 relays, 1 port to external strobe and horn
IP rating IP-66
Housing entries 2 conduit entries, 3/4″ NPT
Approvals Ex d IIC T6 Gb (IECEx pending)
Housing Aluminum alloy
Event log Up to 10 alarm events
Tool Remote controller and Android apps
Alarms OLED flashing, external strobe and horn
Display 128×64 OLED: Real-time readings, gas type, measurement unit, pump, Bluetooth and wireless statuses if available
Installation Pipe holding, wall mount
Warranty 2 years including PID sensor


  • Oil, gas & refineries
  • Chemical plants
  • Manufacturing & processing
  • Pulp paper & waste water treatment
  • Pharmaceutical, solvent recovery
  • Paints, coatings & adhesives
  • Fumigants
  • Air quality control
  • Environmental cleanup

Optional Accessories

  • Intrinsically safe Android phone
  • Strobe and horn
  • Calibration gas cylinder with regulator
  • Filters