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Micro Motion SGM Gas Specific Gravity Meter
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 3D model to learn more about our Compact Density Meters