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Envent Engineering Ltd.

M90 CO2 Monitor
Carbon Dioxide Monitor

M90 CO2 Monitor
M90 CO2 Monitor

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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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 classificationClass I, Div1 Groups C & D
Operating PrincipleDual-beam, non-dispersive infrared (NDIR).
DetectorSapphire window with glass frit seal
Sensing Cell Proof Pressure (Sample cell only)2 PSI (13.8 KPa) gauge pressure
Measurement Range0–20% or 0-100% CO2
Repeatability± 0.1 % CO2
DriftLess 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 TimeLess than 5 minutes
Operating HumiditySensing Cell: 0–100% RH (non-condensing).
Electronics: 0 – 90% RH (non-condensing).
Storage Temperature-20 to 60°C (-4 to 140°F).
Storage Humidity0–90% RH (non condensing).
Analog OutputIsolated 4–20 mA
Digital InterfaceRS-485 & RS-232
Operating Power24 VDC at 2 Watts standard.
12 VDC, 120/240 VAC optional
Source Life10 years minimum
Alarm Outputs2 solid state drivers 2 Amp, 30 VDC maximum
Standard Sample SystemInlet filter (1500psig/103bar max).
SS single stage regulator (3000psig/207bar max).
Flow meter (100psig/6.9bar max).

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