Measurement accuracy with the FLOWSIC 500 Ultrasonic Gas Meter

The latest technology for the ultimate in measurement accuracy: The FLOWSIC500 ultrasonic compact gas meter from SICK enables extremely accurate natural gas distribution measurement. Thanks to its lack of mechanical moving parts, the FLOWSIC500 is rugged, reliable, and maintenance-free – allowing for a significant reduction in operating costs. It is overload-proof, accurate and is monitored by an intelligent diagnostics system. Recalibration is extremely straightforward, as it is simply a matter of exchanging the cartridge.

The FLOWSIC500 can easily be integrated into existing measuring stations. It operates either in a self-sufficient energy configuration or in failsafe network operation with battery back-up. It complies with all pertinent standards and directives. When used in transfer stations and measuring stations, the FLOWSIC500 provides the security of a continuous and blockage-free gas supply.



  • Cutting-edge technology: ultrasound
  • Diagnostics and permanent operational check
  • Rugged and reliable due to lack of moving parts
  • Exchangeable cartridge
  • Straight inlet/outlet zone not required
  • Overload-proof
  • Optional integrated flow conversion / date registration
  • Battery or intrinsically safe power supply


FLOWSIC500 Ultrasonic Gas Meter Specifications

Technical Data
Measured Values
Volume a. c., volumetric flow a. c., gas velocity, volume s. c. (*), volume flow under s.c. (*) (*) additional function included with integrated volume correction
Measurement Principle
Ultrasonic transit time difference measurement
Measuring Medium
Natural gas (dry, odorized)
Measuring Ranges
Volumetric flow a. c., DN 50 1 … 160 m³/h
Volumetric flow a. c., DN 80 2.5 … 400 m³/h
Volumetric flow a. c., DN 100 4 … 650 m³/h
Volumetric flow a. c., DN 150 4 … 1,000 m³/h
≤ 0.1 %
Accuracy class 1; typical error limits
Qmin up to 0.1 Qmax: ≤ ± 1 % 0.1
Qmax up to Qmax: ≤ ± 0.5 %
Accuracy class 1; maximum allowed error limits
Qmin up to 0.1 Qmax: ≤ ± 2 % 0.1
Qmax up to Qmax: ≤ ± 1 %
After high pressure flow calibration: ±0.2 % at test pressure; otherwise ±0.5 %
Diagnostics Functions
Permanent monitoring of measured values
Gas Temperature
–25 °C … +60 °C
Optional: –40 °C … +70 °C
Operating Pressure
PN16 (EN 1092-1): 0 bar (g) … 16 bar (g)
Class 150 (ASME B16.5): 0 bar (g) … 20 bar (g)
Ambient Temperature
–25 °C … +60 °C
Optional: –40 °C … +70 °C
Storage Temperature
–40 °C … +80 °C
MID: 2014/32/EU
OIML R 137-1&2:2012
EN 12405: 2010 (for integrated flow conversion)
IECEx Ex ia [ia] IIC T4 Gb, Ex op is IIC T4 Gb
ATEX II 2G Ex ia [ia] IIC T4 Gb, II 2G Ex op is IIC T4 Gb
NEC/CEC (US/CA) CSA: I.S. for Class 1 Division 1 Groups C and D T4; Ex/AEx ia IIB T4 Ga
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