M90 CO2 – carbon dioxide monitor</span>

The Model M90 is designed to monitor percent level CO₂ concentrations in natural gas applications. An infrared, dual-beam technology is incorporated into the design of the instrument. The M90 can be included as an additional measurement with other Envent analyzers, or can be offered as a stand-alone analyzer with an integrated sample conditioning system.

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Features

Dual-Beam NDIR Technology.
Long-term stability.
Low power consumption (2 watts).
Dual alarm outputs.
4-20 mA output.
RS-232 and RS-485 Modbus communications.
Two Adjustable set point control relays.
The M90 dual-beam infra-red carbon dioxide detection system continuously measures and corrects for the short and long-term concentration changes that caused measurement errors in first generation (single beam) carbon dioxide sensors.

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Certification

Intertek Certification

Applications

CO₂ is measured routinely in natural gas for product quality and process control purposes. Common ranges are from 0-5% for sales gas and up to 0-30% for inlet CO₂ concentration. Some H₂S removal chemical processes can be fine-tuned by slip stream as much CO₂ as possible to gain volume but not so much as to exceed pipeline tariff limits of typically 2-4%. CO₂ is also a combustion byproduct and needs to be quantified.

Value

The M90 dual-beam IR CO₂-detection system continuously measures and corrects for the short and long-term changes that caused measurement errors in first-generation, single-beam CO₂ sensors. The M90 is a compact CO₂ sensor which uses less than 2 watts of operating power, provides linearized analog or digital measurement outputs. Options include adjustable set point control relays.

The M90 offers industry-leading value in price for Class 1, Division 1 Groups C & D hazardous locations. Standard range is 0-20 % CO₂ but other ranges available upon request.

Specifications

Electrical classification	Class I, Div1 Groups C & D
Operating Principle	Dual-beam, non-dispersive infrared (NDIR).
Detector	Sapphire window with glass frit seal
Sensing Cell Proof Pressure (Sample cell only)	2 PSI (13.8 KPa) gauge pressure
Measurement Range	0–20% or 0-100% CO₂
Repeatability	± 0.1 % CO₂
Drift	Less than 2.5% of reading/year
Accuracy	± 3% of reading or 0.1% CO₂ at cal temperature, ± 5% of reading or 0.1% CO₂ over full operating temperature range.
Warm U Time	Less than 5 minutes
Operating Humidity	Sensing Cell: 0–100% RH (non-condensing). Electronics: 0 – 90% RH (non-condensing).
Storage Temperature	-20 to 60°C (-4 to 140°F).
Storage Humidity	0–90% RH (non condensing).
Analog Output	Isolated 4–20 mA
Digital Interface	RS-485 & RS-232
Operating Power	24 VDC at 2 Watts standard. 12 VDC, 120/240 VAC optional
Source Life	10 years minimum
Alarm Outputs	2 solid state drivers 2 Amp, 30 VDC maximum
Standard Sample System	Inlet filter (1500psig/103bar max). SS single stage regulator (3000psig/207bar max). Flow meter (100psig/6.9bar max).