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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 or automatically via. pneumatic unit PU 420
Back-purge inlet
Only possible with the RT, HT, and EX models! min. 6 … 8 bar compressed air with quick connector for 8 mm tube
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)
