The AMI Model 70 provides a complete low cost solution when measuring percent levels of oxygen in the range of 0-25% for general-purpose applications.

This very compact, rugged analyzer combines state-of-the-art microprocessor based electronics with a simple, straightforward user interface.

The large 3½ digit display auto-ranges for maximum resolution, while one of the four standard user selectable output ranges remains fixed in your range of interest.

Other standard features include two fully adjustable oxygen alarm settings, a system failure alarm, and dual outputs: 0-1VDC and isolated 4-20mA.

Standard output ranges include: 0-1%, 0-5%, 0-10%, and 0-25%. Optional ranges available are: 0-50% and 0-95%.

This complete package employs a revolutionary long life zirconium oxide sensor that provides unmatched stability and accuracy even in rapid and extreme temperature swings from -4°F to +130°F. It requires only ambient air for its annual calibration. The long life sensor lasts up to 10 years when used continuously for measurements in the range of 0-21% oxygen and longer if used intermittently.

This eliminates the need to purchase, stock, frequently calibrate or replace the standard galvanic type oxygen sensors, greatly reducing overall costs.

AMI guarantees
higher quality and exceptional services
at a lower price.

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The Model 70 responds rapidly to changes in oxygen levels (90% FS.<12sec.) partially due to its unique sample system. It consists of a compact cellblock with precision-machined passages and critical orifice. This replaces the traditional approach of using several feet of tubing, compression fittings and a needle valve. Our design automatically controls flow rates with varying inlet pressures from 1 to 30psi. and is not flow sensitive in the range of .1 to 10 SCFH.

The Model 70 is truly a high performance, low cost solution panel mount analyzer for general-purpose applications.

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  • Standard output ranges: 0-1%, 0-5%, 0-10%, 0-25% (0-50%, 0-95% optional)
  • Dual outputs: 0-1VDC and isolated
    4-20mA
  • Power requirements:
    10-28VDC, <3Watts
  • Minimum detection:
    0.05% of oxygen or 500ppm
  • Repeatability: 0.05% of range
  • Operating temperature:
    -4°F to 130°F (-20°C to 55°C)
  • Diurnal temperature specification:
    < 1% over temperature range
  • 90% response: < 12 sec
  • Alarms: 2-fully adjustable oxygen
    concentration alarms. Form C contacts.
    110VAC/3A
  • Trouble alarm: Form C contacts. 110VAC/3A.
  • Area Classification: General purpose
  • Weight: < 3lb
  • Dimensions: 4.20"H x 6.40"W x 3.00"D
  • Mounting: Panel mount
  • Sample connections:
    S.S. compression fittings

  • Large auto ranging 3½ digit LCD
  • 4-user selectable output rages to choose from: 0-1%, 0-5%, 0-10%, 0-25%.
    (0-50% and 0-95% optional)
  • Dual outputs: 0-1VDC, isolated 4-20mA
  • RFI protected
  • 10-year life zirconium oxide sensor
  • Rugged compact design
  • Unaffected by change in flow rate
    (.1 to 5 SCFH)
  • 2-fully adjustable oxygen concentration alarms. Form C contacts.
  • Trouble relay. Form C contacts.
  • Security function
  • No calibration or support gases necessary
  • 2 year warranty
  • Unmatched stability over a extreme range of temperature. -4°F to 130°F (-20°C to +55°C).
  • Unaffected by continuous CO2 background gases


  • Long life sensor
  • Low original cost and virtually maintenance free over its entire life
  • Requires no support or calibration gases (other than ambient air)
  • No annual sensor replacement or sensor shelf life issues
  • Virtually unaffected by changes in temperature from -4°F to 130°F

  • Nitrogen skid
  • Flue Gas
  • Air Separation and Liquefaction
  • Quality Assurance
  • Laboratory studies
  • Saturation diving
  • Gas Purity Certification
  • Many other applications