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Micro Motion SGM Gas Specific Gravity Meter
Northeast Controls is pleased to be the authorized Emerson representative to sell this product line for Municipal Water and Wastewater applications, and as part of an overall Integrated Solution for all applications and industries.
A Gas Specific Gravity Meter designed to provide a fast-response, direct measurement of gas specific gravity, molecular weight and relative density.

Gas Specific Gravity Meter Overview

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Micro Motion SGM Gas Specific Gravity Meter


Specific gravity range
0.1 to 3 typical
Up to ± 0.1% of reading
Reference chamber pressure
1.2 to 7.0 bar absolute at 20 °C (17 to 101 psi absolute at 68 °F)
Supply pressure
Minimum1.4 bara (20 psia)
Maximum 12 bara (174 psia)
Temperature range
–18 °C to +50 °C (–0 °F to +122 °F)
Interior liner: 416 stainless steel
Pressure housing:316L stainless steel
Reference chamber:Aluminum alloy
Local display (optional)
Segmented two-line LCD screen.
Can be rotated on transmitter, in 90-degree increments, for ease of viewing.
Suitable for hazardous area operation.
Optical switch controls for hazardous area configuration and display.
Glass lens.
Three-color LED indicates meter and alert status.
Display functions
View process variables
View and acknowledge alerts
Configure mA and RS-485 outputs
Supports Known Density Verification (KDV).
Supports multiple languages
Transmitter output channels
Available output channels (depending on the Electronics Interface option):
One or two externally powered (passive) 4–20 mA outputs
Channel A is 4–20 mA + HART
Channel B is 4–20 mA
One externally powered (passive) Time Period Signal (TPS)output
One externally powered (passive) Discrete output
One Modbus/RS-485 output
Meter approvals, calibrations, and certifications
Agencies and types of approval available:


  • Quickly and directly measure gas specific gravity, molecular weight, relative and base density
  • Simultaneously calculate up to four gas purity curves to support each cycle of hydrogen-cooled generator operation
  • Purge without the need to reconfigure or recalibrate
  • See multivariable outputs including hydrogen purity, calorific value/BTU, Wobbe Index and mass or standard volume flow
  • Expand usage with a hazardous area-approved, head-mounted transmitter that supports local configuration and display
  • Quickly verify meter health and status using advanced internal diagnostics
  • Support multiple simultaneous protocols for connection to DCS, PLC and flow computers
  • Interact with our detailed schematic tool to learn more about our Dedicated Density and Viscosity Meters