AMI Model 201R series offers a complete line of percent oxygen analyzers utilizing a new modular approach. With our recent engineering breakthroughs, we can now provide simple and user-friendly solutions for a variety of applications. This includes a single gas stream measurement or sequenced multiple gas stream measurements for either positive pressure or ambient pressure requirements.

We have outfitted the 201R series with a comprehensive state-of-the art electronics and complete sample handling package using our patent pending cell block technology.

Our advanced modular approach allows the 201R series to tackle any combination of requirements while maintaining the same compact panel mount dimensions of
9.0"W x 5.0"H x 6.5"D.

The standard electronics features include:

  • 2-Fully adjustable oxygen concentration alarm
    set points. Form C contacts rated @ 5 amps.
  • Programmable alarm delays: delay settings range
    from 0-300min. This feature prevents nuisance
    alarms due to quick oxygen spikes or short-term
    operator error.
  • User configurable alarm setting: alarm logic
    choices include latching, non-latching, fail-safe, and
    non-failsafe.
  • 4-User selectable output ranges:
    0-1%, 0-5%, 0-10% and an air calibration range of 0-25%
    Optional ranges: 0-1000ppm, 0-50% or 0-100%
  • Programmable hold off/alarm bypass button:
    prevents false alarms while performing monthly
    calibrations. Allows the technician to bypass both
    alarms for a user selectable time of 0-120 min.
  • High-resolution single range LCD: rapidly reads
    from 0.00% to 25.0% without LCD range changing
    delays or the need for manual range switch
    adjustments.
  • Data logger: logs data for 15 days @ 1min intervals,
    30 days @ 2 min intervals, etc.
  • Sensor calibration factor: indicates remaining
    sensor life.
  • Three-user selectable security levels: allows
    complete front panel access, span only access, or no
    front panel access.
  • Isolated 4-20mA. output.
  • Simple, intuitive user interface.

The 201R series offers the following range of options while maintaining the compact dimensions previously described:

  1. Model 201RS: Comprehensive electronics package with complete sample system for a single positive pressure gas stream, including: flow control valve, flow meter, internal solenoid valves for shut off and sample/span gas selection.
  2. Model 201RSP: Comprehensive electronics package with complete sample system for a single ambient pressure to low-pressure application. Sample system includes: long life sample pump, flow control valve, flow meter, internal span gas and shut off solenoid valves.
  3. Model 201RSM: Comprehensive electronics package with complete sample system for up
    to 5 separate positive pressure gas streams, including: flow control valve, flow meter and internal solenoid valves for programmable 5-channel sequencer.
  4. Model 201RSPM: Comprehensive electronics package with complete sample system for up to 5 separate ambient pressure to low-pressure gas streams. Sample system includes: long life sample pump, flow control valve, flow meter and internal solenoid valves for programmable 5-channel sequencer.

AMI's patented cellblock begins with a single compact metallic block that undergoes a complex machining process, followed with corrosion-resistant nickel plating. The block contains a series of drilled intersecting gas passages and mounted directly on it are: a custom designed flow control valve, flow meter, internal span gas and isolation gas solenoid and compression fittings. All become an integral part of the cellblock.

This eliminates the techniques used by competitors of piecing several lengths of tubing between numerous compression fittings, valving and a flow meter. In using this approach, they add many potential leak paths, increase response times and the need for additional space.

Lastly, our front panel sensor access makes O2 sensor installation or replacement quick and easy without tools or the need to remove any sensitive components. This process takesless than one minute!

Our advanced design approach has separated us from the competition with the highest performance, yet lowest cost oxygen analyzer in the industry.


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

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  • 4 user selectable output ranges to choose from
  • High resolution 3 ½ digit LCD
  • 2 fully adjustable oxygen concentration alarms
  • Alarm delays
  • Alarm hold off/Bypass
  • RFI protected
  • 4-20mA. isolated analog output signal
  • Data logger
  • RS-232 bi-directional communication for advanced features
  • Advanced analog output calibration feature
  • Power requirements: 115/230VAC power
  • Low minimum detection limit
  • Excellent repeatability
  • Single gas or multiple gas streams for positive pressure
  • Single gas or multiple gas streams for atmospheric pressure
  • Patented Cellblock Technology: Allows for all components such as: flow control valve, flow meter, miniature electronic controlled gas and span solenoid valving, compression fittings to be an integral part of the cellblock, eliminating long lengths of tubing and fittings. Other benefits of this design include: compact size, faster response times and front panel sensor access without the need for tools.
  • Area Classification: Designed to meet General Purpose requirements
  • Unaffected by changes in flow rate from 0.1 to 2.0 SCFH
  • Panel mount
  • Compact size
  • 2 year warranty for analyzer, parts and labor
  • 6 month sensor warranty, life expectancy 1-2 years

  • 4 user selectable output ranges to choose from: 0-1%, 0-5%, 0-10% and 25%
  • Optional ranges: 0-1000ppm, 0-50% or 0-100%
    The user selection of an output range simultaneously controls the two alarms, the analog output and the data logger so that all 4 functions operate on the same range
  • Digital display: High resolution 3 ½ digit LCD. Reads full scale from 0.00% to 25.0% independently of output range selection
  • Alarms: 2 fully adjustable oxygen concentration alarms
    Dry contacts 5A. @24VDC/115VAC
  • Alarm delays: Programmable from 0-300 minutes
  • Alarm hold off: Programmable from 0-120 minutes
  • Isolated analog output signal: 4-20mA
    Represents the output range selected: 0-1%, 0-5%, 0-10% and 25%
  • Data logger: Logs data for 15 days @ 1 minute intervals, 30 days @ 2 minute intervals, etc.
    Represents the output range selected: 0-1%, 0-5%, 0-10% and 25%
  • Power requirements: 115VAC/230, 3-10watts depending on 201R model selected
  • Minimum detection:
    0.01% of oxygen
  • Repeatability:
    +/- 0.2% of range or +/- 0.1% of oxygen, whichever is greater
  • Operating temperature range:
    32° to 115° F
  • Diurnal temperature specification:
    < +/- 3 % of scale over temperature range
  • 90% full scale response times for specified range:
    0-25% <10 seconds with P-2 inert background gas sensor
    0-25% < 35 seconds with P-3 CO2 background gas sensor
    0-100% <35 seconds with P-4 100% O2 gas sensor
  • Area Classification: Designed to meet General Purpose requirements
  • Inlet gas pressure for Model 201RS and Model 201RSM: 0.5 to 30psig
    Model 201RS is for use in a single gas stream only
    Model 201RSM is for use in 1-5 multi gas streams with built-in programmable sequencer
  • Inlet gas pressure for Model 201RSP and Model 201RSPM: atmospheric pressure
    Model 201RSP is for use in a single gas stream drawing from atmospheric pressure
    Model 201RSPM is for use 1-5 multi gas streams with built-in programmable sequencer drawing from atmospheric pressures
  • Expected pump life for Models 201RSP and 201RSPM: 2+ years
  • Gas connections: ¼" 316 S.S. compression fittings
  • Wetted parts: 316 S.S. fittings, electroless nickel plated cellblock, gold plated contacts, acrylic flow meter and Viton O-rings
  • Unaffected by changes in flow rate from 0.1 to 2.0 SCFH
  • Mounting: panel mount
  • Dimensions: 9.0"W x 5.0"H x 6.5"D
  • Weight: 8-10 lbs. depending on 201R model selected