Sentinel LCT - Ultrasonic Flow Meter for Liquid Custody Transfer

Sentinel LCT Flow Meter

Sentinel LCT is uniquely designed to meet the strict requirements for custody transfer of hydrocarbons. Its four-path, Robust Path Configuration provides trouble-free operation that will not drift, even when the liquid product changes in the line.







Sentinel LCT Features

  • Viscosity independent
  • Fully welded construction with no moving parts and no filters or strainers
  • Full bore design, no pressure drop
  • Robust Path Configuration
  • Built-in flow computer
  • Custody Transfer Approval to OIML R117, Accuracy Class 0.3
  • Custody transfer measurement
  • Allocation measurement
  • Pipeline leak detection
  • Crude oil and refined products

Operation and Performance

Sentinel LCT has been designed in accordance with OIML R117-1, MID MI-005 and API MPMS 5.8.

Fluid Types Liquid Hydrocarbons
Flow Measurement Correlation transit time mode
Linearity < ± 0.15% of measured volume for flow rates between 2 and 30 ft/s (0.5 and 10 m/s)
Uncertainty of Meter Factor < ± 0.027% according to API MPMS 5.8
Zero Stability < 0.003 ft/s (0.0009 m/s)
Viscosity Range 0 to 500 cSt Consult factory for higher viscosity numbers
Reynolds Range > Re 10,000, consult factory for lower Reynolds numbers
Process Temperature -40°to +120°C (-40° to +248°F) standard
-200° to +600°C (-328° to +1112°F) extended, consult factory
Ambient Temperature -40° to 60°C (-40° to 140°F)
Storage Temperature -40° to 85°C (-40° to 176°F)

Meter Body

Path Configuration Four path Robust Path Configuration™
Meter Body Materials Carbon steel A105/A350LF2
Stainless steel A182, Gr 304/304L
Stainless steel A182, Gr 316/316L
Others on request.
Pipe Sizes 4 in (100 mm) to 24 in (600 mm)
Others on request
Flange Ratings 150 #
300 #
600 #
Others on request
Pipe Schedules 40S
Others on request
PED Compliance PED Cat III, module H
Installation Requirement Meter must be installed with 20D straight piping upstream and 5D straight piping downstream Inlet and outlet piping shall match the meter ID within 1%. In case 20D inlet cannot be mounted, a 10D inlet with tube bundle flow conditioned could be applied.
Pressure, temperature and density connections must be located in the downstream piping. The 20D upstream piping (or 10D with flow conditioner) must be free of items that could disturb the flow profile.


Electronics Enclosure Material Epoxy coated aluminium; SS316 upon request
Dimension Weight: 45 lb (20.4 kg)
Size (lxhxd): 13 x 11 x 9 in (33 x 28 x 23 cm)
Environmental Protection IP66
Power Supply 100 to 240 VAC
12 to 32 VDC
Power Consumption Less than 15 watts
Display High contrast 128 x 64 pixel graphical display with LED illumination.
Outputs Two frequency/pulse outputs, isolated
Two alarm relays
One 4/20 mA output with HART
Inputs Two 4/20 mA and one 100 ohm RTD input for density, pressure and temperature input (option). Three 4/20 mA inputs for density, pressure and temperature input (option).
Digital Interfaces HART over 4/20 mA output
PanaLink over RS232/485/USB
Modbus over RS232/485 (option)
Flow Computer Functionality Integrated flow computer with full P and T volume corrections according to API 11.1
Hazardous Area Certifications USA/Canada: Class 1, Div 1, Groups B, C, & D
Europe: ATEX II 2 G Ex d IIC (Ex d IIC as option); Ex de is optional
IEC Ex: Ex d IIC (Ex d IIC as option); de is optional
CE Compliance 2004/108/EC EMC Directive
2006/95/EC LVD

Custody Transfer Approvals

OIML R117-1 by NMi

Country-specific approvals (consult factory)

The custody transfer approvals are valid for the flowmeter only. These approvals are not applicable for the built-in flow computer.




Descriptions English
PanaView for Sentinel Operating Manual PanaView for Sentinel Operating Manual
Sentinel LCT Data Sheet Sentinel LCT Data Sheet
Sentinel LCT Operating Manual Sentinel LCT Operating Manual