Diesel Flow Meter

Fuel-Terminal & Fleet Build

Accuracy ±0.5% standard
Turndown 1:10 to 1:20
Working pressure 4.0 MPa standard

Line sizes DN4 to DN300 covering small dosing, retail dispensers, fleet card-lock, terminal manifolds, and large-bore bunker transfer
316L body + 2Cr13 impeller standard for diesel sulfur tolerance, duplex impeller available for biodiesel
CNEX Ex d IIC T6 zone-1 hazardous-area certification ships standard for fuel service

Configure & Price Request Engineering Quote

LWGY Liquid Turbine Flow Meter; instrument body with display head

Diesel meters serve fuel terminals, retail dispensers, fleet card-lock cabinets, and biodiesel batching; wherever volume reconciles to billing or fuel-quality cert. LWGY 316L body + 2Cr13 impeller take residual sulfur in EN 590 / ASTM D975 diesel; CNEX Ex d IIC T6 zone-1 ships standard. Accuracy ±0.5% of rate, the custody class for terminal transfer.

Benefits

316L body for diesel sulfur tolerance
2Cr13 impeller standard, duplex for biodiesel
CNEX Ex d IIC T6 zone-1 ships standard
±0.5% of rate custody class; ISO 9001 cal cert
4-20 mA + HART, RS-485, pulse, GPRS-IoT
5–7 business days from the factory

Typical applications

Four diesel-fuel zones where LWGY is the standard specification.

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Terminal manifold custody-transfer

Truck-loading 30–200 m³/h reconciles to ±0.5% vs truck-tank gauge. Depot/marine-bunker DN200–DN300 at 800–1800 m³/h, ±0.5% of rate.

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Fleet card-lock and on-site dispensing

Card-lock dispensers 1–10 m³/h totalize per vehicle/driver/cost-center. Pulse drives K-factor counter; GPRS-IoT pushes daily volume; Ex d zone-1 covers cabinet zone.

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Retail underground-tank dispensers

Submersible-pump discharge tank-to-island totalizes 4–20 m³/h to station POS for shift reconciliation. IP67 handles pump-pit submergence; ±0.5% meets weights-and-measures interval.

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Biodiesel batching and B-grade blending

B5/B20/B100 batching where volumetric ratio drives fuel-quality cert. Duplex impeller upgrade takes methyl-ester chemistry that retires 2Cr13. 4-20 mA + HART drives batch setpoint.

Flow range by pipe size.

Volumetric flow range for standard-grade diesel (≈830 kg/m³ at 15 °C) across the full LWGY Series range, DN4 to DN300, covering laboratory dosing, retail submersible-pump lines, terminal manifold custody-transfer, and large-bore bunker / depot transfer.

DN	Inches	Normal range (m³/h)	Extended range (m³/h)	Connection
DN4	1/8″	0.04 – 0.25	0.04 – 0.4	Threaded
DN6	1/4″	0.1 – 0.6	0.06 – 0.6	Threaded
DN10	3/8″	0.2 – 1.2	0.15 – 1.5	Threaded
DN15	1/2″	0.6 – 6	0.4 – 8	Threaded / Flanged
DN20	3/4″	0.8 – 8	0.45 – 9	Threaded / Flanged
DN25	1″	1 – 10	0.5 – 10	Threaded / Flanged
DN32	1-1/4″	1.5 – 15	0.8 – 15	Threaded / Flanged
DN40	1-1/2″	2 – 20	1 – 20	Threaded / Flanged
DN50	2″	4 – 40	2 – 40	Threaded / Flanged
DN65	2-1/2″	7 – 70	4 – 70	Threaded / Flanged
DN80	3″	10 – 100	5 – 100	Threaded / Flanged
DN100	4″	20 – 200	10 – 200	Threaded / Flanged
DN125	5″	25 – 250	13 – 250	Flanged
DN150	6″	30 – 300	15 – 300	Flanged
DN200	8″	80 – 800	40 – 800	Flanged
DN250	10″	125 – 1250	60 – 1250	Flanged
DN300	12″	180 – 1800	90 – 1800	Flanged

Specifications

Measurement principle	Velocity-type liquid turbine; torque-balance impeller cuts magnetic pickup, pulse train proportional to volumetric flow
Standard	JB/T9246-2016 turbine flow sensor
Pipe size range	DN4 – DN300 (1/8″ – 12″) full LWGY Series; DN4–DN10 dosing / lab, DN15–DN100 retail + fleet, DN125–DN300 terminal + bunker transfer
Accuracy	±0.5% of rate standard (custody class), ±1.0% economy build; ISO 9001 calibration certificate with each meter
Turndown	1:10 (DN15 – DN50), 1:20 (DN65 – DN100)
Working pressure	4.0 MPa (H4) standard, 6.3 / 10.0 MPa available; ANSI 150 / 300 / 600 LB flange options
Medium temperature	−20 to +120 °C (room-temperature type, standard) covers all diesel service including hot-jacket return service; −40 to +180 °C (high-temperature type) optional for cold-climate winter diesel below −20 °C; per LWGY 2-tier specification
Ambient temperature	−20 to +65 °C
Body material	316L (code 6) standard for diesel sulfur tolerance, 304 (code 4) optional, custom (X) on request
Impeller material	2Cr13 (code C) standard, duplex stainless (code G) for biodiesel above B20, 430F (code F) economy
Connection	Threaded (DN4 – DN50, G1/2 to G2-1/2 or NPT), flanged (DN15 – DN300, ANSI 150 / 300 / 600 / 900 / 1500 LB or PN 1.6 / 2.5 / 4.0 / 6.3 MPa)
Output signals	4-20 mA (2-wire), HART (5), RS-485 Modbus-RTU (4), pulse 3-wire (2), GPRS-IoT (6)
Power supply	24 V DC (U code) standard, 3.6 V lithium battery (V code) for unattended remote sites (≈0.3 mA standby, 5-year typical service life)
Hazardous area	CNEX Ex d IIC T6 zone-1 standard for fuel-terminal, retail dispenser, and underground-tank pump-pit service
Ingress protection	IP65 / IP66 / IP67 (IP67 standard for retail underground-tank submersible-pump installations)
Transmitter form	Integrated (S code) for indoor terminal racks, remote (F code) for retail dispenser cabinets where the rotor mount is buried
Approvals	EMC 2014/30/EU (Annex II), CE, JB/T9246-2016 calibration certificate with each meter

Installation

Five install rules, with diesel-specific guidance for terminal-manifold and dispenser pump-pit service.

Run pipe full; air pockets read as phantom flow.
10D upstream / 5D downstream; 20D after a 90° elbow, 50D after a partial-open valve.
Bench-test pulse before pipeline insertion; verify pickup-coil and wiring before burying the meter.
Slow first-fill; open outlet last; flow shock on a dry rotor spalls the bearing.
Cable ≤ 1000 m, ground ≤ 10 Ω, 6-month bearing inspection.

Frequently asked questions

Why is the diesel turbine meter built on 316L body and 2Cr13 impeller instead of 304?+

Diesel under EN 590 / ASTM D975 carries residual sulfur and thiol species that pit 304 stainless within 12 to 24 months. 316L molybdenum body resists pitting; the 2Cr13 martensitic impeller holds bearing tolerance better than 430F. For B20+ biodiesel specify the duplex impeller (code G); methyl-ester chemistry retires 2Cr13 within 24 months.

What bore range covers terminal custody-transfer vs retail dispenser service?+

DN4 to DN300 covers every diesel service class on a single model. Lab dosing DN4–DN10 at 0.04 to 1.5 m³/h. Retail submersible-pump DN25–DN40 at 4 to 20 m³/h. Fleet card-lock DN20–DN25 at 1 to 10 m³/h. Terminal custody-transfer DN50–DN100 at 30 to 200 m³/h. Bunker / depot DN150–DN300 at 250 to 1800 m³/h.

What is the difference between this model and the gasoline-flow-meter?+

Both run LWGY with 316L body + Ex d zone-1. Diesel model covers DN4 to DN300 for low-volatility hydrocarbon (terminal, retail, fleet, biodiesel). Gasoline model runs DN15 to DN80 with tighter zone-1 group-IIB cert documentation for higher-volatility, lower-flash-point service. Both ship 5–7 business days. Pick by product handled.

Why is Ex d zone-1 mandatory and not zone-2 for fuel service?+

Diesel terminal manifolds, retail submersible-pump connections, and fleet card-lock cabinets are IEC zone-1 (NEC Class I Div 1); flammable vapor present in normal operation. Zone-1 mandates Ex d (flameproof) on every electrical enclosure. CNEX Ex d IIC T6 ships standard. Specify zone-1 group-IIA / IIB at order; zone-2 sites can accept zone-1 cert without requalification.

How accurate is the meter for terminal custody-transfer accounting?+

Standard ±0.5% across 1:10 to 1:20 turndown. Terminal custody-transfer runs on the same ±0.5% custody class; specify a multi-point witnessed calibration at order if the local tariff regime requires it. Standard ±0.5% covers fleet, biodiesel, and retail-station service.

What output signal pairs with terminal SCADA and retail dispenser controllers?+

Terminal SCADA (Honeywell Experion, Emerson DeltaV, Schneider EcoStruxure) runs 4-20 mA + HART or RS-485 Modbus-RTU. Retail dispenser controllers (Wayne, Gilbarco, Tatsuno, Tokheim) accept the pulse output for K-factor scaling at the dispenser head. Unattended remote sites: specify GPRS-IoT (code 6) + 3.6 V lithium battery (V code).

What is the lead time and what certification ships standard?+

Lead time is 5–7 business days, factory direct. CNEX Ex d IIC T6 zone-1 ships standard. EMC 2014/30/EU (Annex II) ships standard. JB/T9246-2016 calibration certificate ships with each meter. IP65/66/67 selectable; IP66 typical for outdoor terminal-manifold, IP67 standard for underground-tank submersible-pump connections.

Need help sizing the diesel build?

Send pipe size, service, flow rate, Ex zone, and SCADA/dispenser controller. Flow engineer returns DN, body/impeller code, output, ballpark price in 4 hours.