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OMS 420 Details 001
OMS 420 Details 002

OMS 420 – Insitu Oxygen / Combustibles Monitor

OMS 420 Details 001
OMS 420 Details 002
In-Situ Oxygen and Combustibles (COe) Transmitter
  • All combustions with combustion temperatures up to max. 3,092 °F (1,700 °C) (see different models)
  • Die casting aluminum enclosure with electronics, keyboard, up-front display of O₂ and COe*
  • COe measurement
  • Compressed air back-purge with control valve complete with electronics

Description

Features:

  • In-situ combustion optimization monitor
  • Oxygen and Combustibles (COe) Transmitter
  • combination of O2 and COe for ideal combustion efficiency
  • Superior Design for Superior Results!
  • Real-time measurements
  • Unique, heated solid electrolyte combustibles sensor
  • Easy access to sensors for fast and simple service

Benefits:

  • Make your combustion process more cost-effective.
  • Get the data to show your organization cares about the environment.

Applications:

Gas Turbines / Compressor Stations / Boiler Manufacturers / Iron & Steel Industry / Power Plants / Refineries / Petrochem

 

 

The MRU OMS 420 Series Transmitters are offered in four different versions: Compact, Remote mount, High-temp, or Ex for hazardous locations.  The OMS 420’s are  the ideal choice to optimize fuel efficiency on combustion sources, with a number of advantages over other transmitters.

  • The addition of our unique combustibles sensor allows safe operation with a lower Excess Air Ration, translating in to higher efficiencies
  • The MRU Combustibles Sensor is accurate and stable even down to 1% oxygen – No dilution is needed.
  • The Flow Guidance Tube design allows the sensor to be mounted near the back of the transmitter to make service fast, easy, and no need for system shutdown.
  • Mounting versatility
  • Available Auto Calibration

Better sensors and design for better performance and reliability

  • Zirconium dioxide O2 sensor has long life, fast response, high stability & low energy consumption
  • Heated Solid Electrolyte COe sensor has high accuracy/sensitivity, fast response, long life, and stable down to 1% oxygen -No dilution air required,
  • Flow Guidance Tube allows easy access to the sensors and are suitable for high dust / particulate or high temperature applications to 3000°F with probe lengths to 6′
  • Optional Auto Calibration
Measurement component Measuring range Resolution Accuracy
O2 Oxygen 0 … 25 Vol. % absolute 0.01 % ± 0.2 % or ± 5 % of reading*
COe Combustibles 0 … 1,000 ppm 1 ppm ± 50 ppm or ± 10 % of reading*

 

General technical data  
Warm-up time min. 30 min.
Flange DN65 PN6 flange, Ø 6.3” (160 mm)
Probe tube 12” … 6.5-foot (300 … 2,000 mm) Ø 2.36” (60 mm)
Flange temperature min. 158 ° F … max. 302 °F (+70 … max. +150 °C) (condensation moisture must be avoided)
Response time/T90 < 10 sec.
Analog output 2x current loop 4 … 20 mA, with galvanic isolation linearized for both 0 … 25.00 % O₂
and 0 … 1,000 ppm COe (user definable settings in 0.5 % steps are possible)
Digital output RS 485 (with Modbus protocol, without galvanic isolation)
Power supply

18 … 24 Vdc (for model OMS 420 compact), 90 … 100 W

Electronics of the transmitter with local microprocessor, display and 4 push-buttons
Calibration inlet with test gas fitting for 6/4 mm tube calibration gas supplied manually
Back-purge inlet NA – Only possible with the RT, HT, and EX models!
Ambient temperature of electronics -4 … 140 °F (-20 … +60 °C)
Enclosure Transmitter die cast aluminum, 6.3“ x 6.3“ x 2.36“ (160 x 160 x 60 mm) and 7.87“ (200 mm) probe tube, Ø 1.97“ (50 mm)
Protection class IP65
Weight approx. 7.7 lbs. (3.5 kg) (without probe and flange)

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Download Brochure MEX

Download Selection Chart

 

 

 

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TEST