Model 3000MA​​​​

Paramagnetic Oxygen Analyzer​​​



The 3000MA analyzers are versatile, microprocessor based instruments specifically designed to detect oxygen in a variety of gases. They are precise, cost effective instruments capable of measuring percent oxygen in as low as the 0-1% range. Drawing on the solid performance of the highly successful 3000 Series control platform, these provide the user with a wide variety of features and options to satisfy virtually an​y application.

Leader in Oxygen

These can be ordered as a standard unit or as a part of a larger analytical system. With over 50 years of analytical instrument experience, Teledyne supplies sensors, custom engineered  analyzers and complete monitoring systems to satisfy unique applications. From portables to on-line units, in microprocessor based or analog configurations, no other manufacturer comes close to matching Teledyne’s breadth of instrumentation.

Paramagnetic Sensor

The physical property distinguishing oxygen from other gases is its paramagnetism. The paramagnetic sensor consists of two spheres arranged in the form of a dumbbell suspended in a symmetrical, non-uniform magnetic field. When the surrounding gas contains oxygen, the dumbbell spheres rotate out of the magnetic field by the relatively strong attraction of oxygen.

A light beam focused on a mirror attached to the dumbbell reflects asymmetrically onto two photo diodes resulting in a voltage shift. The voltage difference produces a current used to drive the dumbbells back to the original position. The current flow required to maintain the null position is directly proportional to the oxygen concentration and is shown linearly in volume percent oxygen in the display. Properly maintained paramagnetic sensors last for years with little or no attention making them ideal for critical measurements in the low percent range.​


The analyzers offer three dynamic, user configurable ranges plus auto-ranging and can be calibrated in any range. The instrument is linear on all three ranges, eliminating the need to recalibrate while switching between ranges. The analyzers come standard with an isolated 4-20 mADC output for oxygen concentration and range identification. Additionally, a bi-directional RS-232C serial communication interface provides for remote monitoring and control of span and zero functions. Auto-calibration capabilities also come as a standard feature in the 3000 series platform.

Additional Advantages

  • Linearity of analysis across three user-selectable ranges

  • Auto-ranging to follow process upsets

  • Auto-calibration electronics standard

Sample Gas Conditioning Requirements

​Sample Inlet Pressure​

​5 to 20 psig (regulate to fixed inlet pressure)

​Sample Flow

​1 to 2 SCFH

​Sample Dewpoint

​Non-condensing at ambient pressure

​Sample Temperature

​32° to 122°F (0° to 50°C)

​Detector Wetted Parts

​​Acrylic Glass, Epoxy Resin, Glass, Gold, Steel, Viton


  • Proven, robust paramagnetic sensor

  • Three user-selectable ranges plus cal range

  • Signal and Range ID output: isolated 4-20 mADC

  • Programmable auto-ranging

  • Two fully adjustable concentration alarm set points with programmable relay functions, Form C contacts, 3A resistive

  • Calibration contact span/zero, Form A normally open contact, 3A resistive

  • Self diagnostics with Form C failure alarm contacts

  • Full duplex RS-232C​ communication link

  • Five digit oxygen concentration LED display

  • 2 x 20 alphanumeric vacuum fluorescent display for set up and diagnostics

  • Brass sample passages and fittings

  • Universal power supply: 100-240 VAC / 50-60 Hz

  • Remote calibration digital inputs

  • Microprocessor based

  • Exceptional performance, price value

  • Advanced paramagnetic sensor

  • Designed for air separation industry


​3 user selectable ranges; typical ranges 0-5% to 0-100%; auto-ranging with ID output (lower ranges available)
Calibration range: 0-25%
​± 1% of FS at constant temperature
± 5% of FS over operating temperature range on factory default analysis ranges (once thermal equilibrium has been achieved)
​Response Time
​90% of FS in <10 seconds at 77°F (25°C)
​1% O2
​Zero:    1% O2/1 month
Span:   1% FS/1 month
​32° to 113°F (0° to 45°C)
​Two 0-1 VDC & two 4-20 mADC​ isolated (concentration and range ID)
One system failure alarm contact to detect power failure
Two adjustable concentration threshold alarms with fully programmable set points
​Analysis Display:     5 digit red LED, 3/5" high numerals
Menu Display:          20 character, 2 line vacuum fluorescent
Digital Interface:     Full duplex RS-232C communications port
​Universal AC input ranges, 100 to 240 VAC, 50/60 Hz, 70 watts max
​6.96"H x 8.7"W x 12.2"L (control unit)
(17.68 x 221.0 x 310.0 cm)
​C - Electronically operated cal​/zero valves​


  • Monitoring inert gas blanketing

  • Air separation and liquefaction

  • Chemical reaction monitoring

  • Emissions monitoring

  • Petrochemical process control

  • Quality assurance

  • Gas analysis certification​