Q46/84 Hydrogen Peroxide Monitor from ATI

ATI’s Model Q46/84 Hydrogen Peroxide Monitor is designed to continuously measure the concentration of H2O2 in aqueous systems.


ATI’s Model Q46/84 Hydrogen Peroxide Monitor is designed to continuously measure the concentration of H2O2 in aqueous systems. Using a direct peroxide sensor, the unit responds rapidly to changes in concentration, enabling operators to control chemical feed to maintain specific targets. With both digital and analog communication available, the Q46 is adaptable to a wide variety of peroxide monitoring applications.

Hydrogen Peroxide (H2O2) is an extremely strong oxidizer which is widely used in bleaching application in the paper industry and is sometimes added to water systems for the purpose of disinfection. In addition, it is used in wastewater collection systems to remove hydrogen sulfide that destroys concrete pipe and manhole structures. Peroxide application in aqueous systems, like most chemical treatment processes, function most efficiently with accurate measurement and control.

Hydrogen Peroxide sensors are amperimetric devices isolated from the water by a peroxide permeable membrane. As peroxide diffuses through this membrane, it comes in contact with an active electrode and is oxidized on the surface. The net effect is that the sensor generates a current proportional to H2O2 concentration. An integral RTD in the sensor provides for automatic temperature compensation, allowing the sensor to operate accurately over a range of 0-50°C.

Peroxide sensors are capable of operating over a fairly broad concentration range, from a low range of 0-2 ppm up to a high range of 0-200 ppm. Systems will operate with good sensitivity down to 0.05 ppm and respond to changes in concentration within about 60 seconds, making them useful for automatic control.


  • rogrammable range options from 0-2 PPM up to 0-200 PPM provide maximum application flexibility
  • AC or DC Power Options
  • Two isolated 4-20 mA outputs are standard, with an option for a third output if required. Default setting provides analog outputs for H2O2
  • Standard PID control function assignable to one analog output
  • Available in either Profibus-DP, Modbus-RTU, Modbus-TCP/IP, or Ethernet-IP
  • Three SPDT relays are standard, with relay functions programmable for alarm, control, or trouble indication. Three additional low power relays available as an option
  • NEMA 4X (IP-66) enclosure is suitable for wall, pipe, or panel mounting
  • Back-lit large LCD display provides clear visibility in any lighting conditions. A scrolling second line on the display provides additional information and programming prompts
  • Flow control and flowcell options

Hydrogen Peroxide sensors require a steady flow of sample across the membrane at the tip of the sensing assembly. ATI offers options for flowcells, including the standard constant-head overflow system, and a sealed flowcell for pressures up to 50 psi. For simplicity of installation, complete flow control assemblies are available. Panel assemblies are available with or without a flow switch and can greatly reduce installation time.

Specifications – Monitor

Display Range 0-2.000, 0-20.00, 0-200.00 ppm
Repeatability ±0.05 ppm
Temperature Drift 0.01% of span/°C
Accuracy 0.1 ppm of selected range
Linearity 0.1% of selected range
Analog Output Two isolated 4-20 mA, 500 Ω load maximum, 3rd output optional
Relays Three SPDT 6A@250VAC, 5A@24VDC
Display 4 digit, 0.75″ numeric LCD with 12 character second line, LED back light
Enclosure NEMA 4X (IP-66) Polycarbonate, V-0 flammabiltiy
Operating Temperature -40 to 60°C
Weight 6 pounds
Zero Drift <0.01 ppm/month

Specifications -mSensors & Flowcells

H2O2 Sensor Membraned covered polargraphic
Materials PVC
Response Time 90% in 60 seconds
Temperature Limits 0 to 50°C
Pressure Limits 0-50 psig
Sensor Cable 25′ standard
Sensor Flowcell Clear acrylic constant head overflow standard, sealed acrylic flowcell optional
Sample Connections ¼” id hose barb inlet, ½” id hose barb drain for standard flowcell
Temperature Sensot Internal Pt100 RTD
Sample Flow 5-15 GPH (0.3-1.0 LPM)

Ordering Information

For pricing please call AFC International at 800-952-3293, 219-987-6825 or fax 219-987-6826 or email sales@afcintl.com.


Q46/84 Hydrogen Peroxide Monitor Literature

  • ATI is now a Badger Meter brand

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