Accurate and efficient gas measurement for custody transfer with the TwinSonic Plus Ultrasonic Meter

The TwinSonic Plus Ultrasonic Meter combines two measurements in one meter body: The Honeywell Elster Q.Sonicplus 6-path (two single and four double reflection paths) for the fiscal measurement and the CheckSonic 2-path (two single reflection paths) for the “check” measurement. Each measurement has its own independent series 6 signal processing unit (SPU) with color graphic touch screen display.

This meter provides additional measurement confidence by offering an internal pressure and temperature sensors for a more accurate calculation of Reynolds number and dynamic body correction. This ensures a repeatable and accurate flow measurement, even when process conditions vary or differ from calibrated conditions.


TwinSonic Plus Ultrasonic Meter Features

  • Two totally independent flow meters in one meter body providing fiscal measurement with verification
  • Flow profile detection with swirl and asymmetry measurement
  • Titanium-encapsulated, intrinsically safe transducers
  • Diagnostic detection of liquid and dirt build-up
  • Bi-directional measurement
  • Internal temperature sensor
  • No moving parts
  • No pressure drop
  • SonicExplorer PC Software for configuration, diagnostics and health care

TwinSonic Plus Ultrasonic Meter Specifications

Technical data
Measurement Principle
Ultrasonic transit time measurement
10″ to 36″—larger sizes available upon request (DN 250 to DN 900)
Pressure Range
8 bar (116 psi) to 150 bar (2175 psi); minimum pressure depending on size and gas composition
Process Temperature Range
Standard: -40°C to +80°C (-40°F to +176°F)
Extended: -50°C to +80°C (-58°F to +176°F)
Ambient Temperature Range
Standard: -40°C to +85°C (-40°F to +185°F)
Extended: -50°C to +85°C (-58°F to +185°F)
Typical Uncertainty
0.5% of reading after dry calibration
0.2% of reading after flow calibration
0.1% of reading after flow calibration and linearization
0.5-1% depending on application
Body Materials
Low-temperature carbon steel ≤ 12″: ASTM A350-LF2 Cl.1 ≥ 14″: ASTM A333 grade 6/ASTM A350-LF2 Cl.1
Stainless steel ≤ 12″: ASTM A182-F316 ≥ 14″: ASTM A312-TP316L/ASTM A182-F316L
Other materials on request
Body Construction Details
≤ 16″: reduced bore, 7° tapered inlet (forged) ≥ 18″: full bore (machined and welded)
Material Certificate
EN 10204 3.1 (3.2 on request)
Pressure Reference Point
½” NPT (G½ on request)
Electronic Enclosure Material
Copper free aluminium, stainless steel (optional)
Power Supply
Nominal 24 V DC (18-30 V DC), 10-20 W (depending on installed optional cards)
Local Display
GUI, 4.3″ widescreen graphical colour display with 7 capacitive soft keys (touch)
2 serial ports (RS 232/485 configurable)
1 Ethernet port/high speed VDSL (VDSL option replaces Ethernet port)
2 frequency outputs, 0 to 3 kHz
2 digital outputs
2 analogue outputs
1 USB port (device)
Communications Protocol
MMS (Manufacturing Message Specification)
Built-in web server
Metrological Approval
MID T10335 (optional for primary measurement only)
MID Accuracy
Class 1.0
Hazardous Area Approvals
ATEX: II 2 G Ex d ia [ia] IIB+H2 T6 Gb
IECEx: Ex d ia [ia] IIB+H2 T6 Gb
FM: Class I, Division 1, Group A to D T6
CSA: Class I, Division 1, Groups B, C and D T6; Ex d ia [ia] IIB+H2 T6 optional for primary measurement
Ingress Protection
IP66 /NEMA Type 4X