HORIBA Europe GmbH

- Model APMA-370 - Ambient Carbon Monoxide Monitor



The APMA-370 is a device for continuously monitoring CO concentrations using a Non-dispersion cross modulation infrared analysis method. The APMA-370 employs an independent, internal dry-method sampling device to achieve the highest levels of sensitivity and accuracy. The dry method, due to its capability for continuously monitoring and instantaneously analyzing of gas in its unaltered state as well as its minimal maintenance requirements, has been a preferred method for monitoring the atmospheric pollution.

  • The cross flow modulation type, infrared-absorption technology eliminates the need for adjusting optical alignment. For the user, this means very stable and sensitive (5 ppm F.S.) measurements.
  • The APMA-370 uses an AS type (antishock) interference-compensating detector, and a purified reference gas. The reference gas is generated by purging the sample through an oxidation process, where an oxidizing catalyst burns the CO to CO2. These features eliminate interference from other elements, resulting in highly accurate measurements.
  • The APMA-370 does not use such components as reflecting mirrors, that attract foreign matter. This means the optical bench stays clean assuring you of stable results over long periods of time.

Cross flow modulation, Infrared (NDIR) absorption technology

Conventional technology uses an optical chopper to obtain modulation signals. Instead, the APMA-370 uses solenoid valve cross flow modulation. Fixed amounts of the sample gas and the reference gas are injected alternately into the measurement cell. With the cross flow-modulation method, if the same gas is used for both the sample gas and the reference gas {e.g., zero gas could be used for both), no modulation signal will be generated. This has the great advantage that, in principle, when analyzing minute amounts of gas there is no generation of zero-drift. An additional advantage is that the elimination of rotary sectors precludes the need for optical adjustment. These features assure greatly improved stability over long periods of measurement. A further improvement is that in the front chamber of the detector, the measurable components, including interference components, are detected; in the rear chamber, only interference components are detected. By means of subtraction processing, the actual signal obtained is one that has very little interference.

  • Approval according to EN 14626: TÜV 936/21204643/B
  • Continuous measurement of CO in ambient air
  • 'Cross Flow' Modulation principle for stable measurements
  • interference-compensating detector to suppress the influences of moisture
  • Critical orifice for constant flow
  • Pressure and temperature compensated
  • Optimized components to reduce maintenance costs and power consumption
  • Reduced weight design allows easier handling
  • Internal sample gas pump
  • Optional module for internal control function
  • Large LCD touch-screen display (117 x 88 mm)
  • Password protection against unauthorized access
  • Remote software for an external operation
  • High connectivity via RS232, Ethernet or analog (optional)
  • Internal memory for different average values, calibration history and alarm history
  • CF slot allows for memory expansion

  • Principle: Cross flow modulation, non-dispersive infrared (NDIR) absorption technology
  • Application: CO in ambient air
  • Range: Standard ranges: 0-10/20/50/100 ppm; 0-5/10/20/50 ppm; auto range ~ manual range selectable; can be operated by remote switching.
    Optional (measurable) ranges: 4 ranges selectable from 0-100 ppm, within 10 times range ratio; auto range ~ manual range selectable; can be operated by remote switching.
  • Repeatability: ±1.0% of F.S.
  • Linearity: ±1.0% of F.S.
  • Sample gas flow rate: Approx. 1.5L/min
  • Indication: Measured value, range, alarm, maintenance screen
  • Alarms: During AIC, zero calibration error, span calibration error, temperature error in catalyzer, etc.
  • On-screen messages are available in four languages: English, German, French, and Japanese.
  • Input/output:
    • 0-1 V/0-10 V/4-20 mA, to be specified (2 systems: either (1) momentary value and integrated or (2) moving average value)
    • Contact input/output
    • RS-232C
  • Power: 100/110/115/120/220/230/240 VAC, 50/60 Hz (to be specified)
  • Dimensions: 430(W) x 550(D) x 221(H) mm
  • Mass: Approx. 16 kg.

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