Product Description

The LXLG series horizontal vane wheel water meter (also known as Woltmann type) is the most widely used mechanical flow meter in agricultural irrigation. Its internal vane rotates like a water wheel as water flows axially through the meter, driving a gear train that accumulates the volume on a mechanical register.

Designed specifically for the challenging conditions of irrigation, this meter tolerates small amounts of sand, weeds, and other impurities commonly found in open water sources. It features low pressure loss, high flow capacity, and a removable measuring mechanism for easy maintenance without breaking the pipeline.

WINMETER offers the full range from DN50 to DN300, covering applications from small farms to large irrigation districts.

Key Features

Designed for Agricultural Irrigation: Suitable for river, canal, well, lake water and reclaimed water irrigation.
Can be Used as Sewage Water Meter: Durable construction allows metering of agricultural wastewater and reclaimed water.
Removable Mechanism: The internal measuring unit can be replaced without removing the meter body from the pipeline – easy maintenance.
Anti‑Blockage Design: Special vane wheel structure resists wrapping by weeds, sand, and debris.
High Flow Capacity: Horizontal vane wheel design ensures low pressure loss and high flow rates up to DN300.
Long Service Life: Ductile iron body with epoxy coating, metal cover, wear‑resistant components.
Hermetically Sealed Register: Copper case prevents fogging, ensures clear long‑term reading.
Pulse Output Optional: Ready for remote reading (reed switch / Hall sensor) to connect with SCADA or IoT systems.

Working Principle

Water enters the meter axially, passes through a flow straightener, and drives a horizontally mounted vane wheel. The rotational speed of the vane is proportional to the flow velocity. Through a gear reduction mechanism, the rotation is transmitted to a mechanical register, displaying the total volume passed.

Technical Specifications

Parameter	Details
Model	LXLG-50 to LXLG-300
Nominal Diameter	DN50 / DN65 / DN80 / DN100 / DN125 / DN150 / DN200 / DN250 / DN300
Overload Flow (Q4)	31.25 - 1250 m³/h (see flow table)
Permanent Flow (Q3)	25-1000 m³/h (see flow table)
R‑ratio	R50 / R80 optional (acc. to ISO 4064)
Accuracy	Cold water: • Low zone (Q1 ≤ Q < Q2): ±5% • High zone (Q2 ≤ Q ≤ Q4): ±2% Hot water: • Whole range: ±3% (≤90°C)
Temperature Class	T50 (≤50°C) / T90 (≤90°C) optional
Pressure Rating	PN10 / PN16 optional
Pressure Loss	ΔP ≤ 63 kPa at Q3, meets ΔP25 class
Installation	Horizontal (register facing up)
Connection	Flanged (GB/T 9119 / ISO 7005 / ANSI / DIN optional)
Body Material	Ductile iron with epoxy coating
Vane Material	Reinforced nylon / wear‑resistant engineering plastic
Register	Dry‑dial, copper case, anti‑fog
Minimum Reading	0.01 m³ (all sizes)
Maximum Reading	9,999,999 m³ (all sizes)
Protection Class	IP68 optional (submersible)

product-3050-2148

Flow Rate Parameters

Model	Unit	LXLC-50	LXLC-65	LXLC-80	LXLC-100	LXLC-125	LXLC-150	LXLC-200	LXLC-250	LXLC-300
Nominal Diameter	mm(inch)	2"	2-1/2"	3"	4"	5"	6"	8"	10"	12"
Overload Flow (Q4)	m³/h	31.25	50	78.75	125	200	312.5	500	787.5	1250
Permanent Flow (Q3)	m³/h	25	40	63	100	160	250	400	630	1000
Transitional Flow (Q2)	m³/h	0.5	0.8	1.26	2	3.2	5	8	12.6	7.5
Minimum Flow (Q1)	m³/h	0.3125	0.5	0.787	1.25	2	3.125	5	7.875	12.5
Minimum Reading	m³	0.001	0.001	0.001	0.001	-	0.01	0.01	0.01	0.01
Maximum Reading	m³	9,999,999	9,999,999	9,999,999	9,999,999	99,999,999	99,999,999	99,999,999	99,999,999	999,999,999
Temperature Class	T/°C	T50/T90
Pressure Rating	MPa	1.0/1.6
Pressure Loss Class	MPa	△P63
Installation Direction	-	Horizontal

product-3523-1860

Dimensions & Flange Details

product-2906-2254

Model	DN (mm)	Inch	Length L (mm)	Height H (mm)	Flange OD D (mm)	Bolt Circle D1 (mm)	Bolt Holes
LXLG-50	50	2"	200	253	165	125	4‑M16
LXLG-65	65	2½"	200	268	185	145	4‑M16
LXLG-80	80	3"	225	284	200	160	8‑M16
LXLG-100	100	4"	250	295	220	180	8‑M16
LXLG-125	125	5"	250	310	250	210	8‑M16
LXLG-150	150	6"	300	339	285	240	8‑M20
LXLG-200	200	8"	350	382	340	295	8‑M20 (PN10) / 12‑M20 (PN16)
LXLG-250	250	10"	400	433	395	350	8‑M20 (PN10) / 12‑M24 (PN16)
LXLG-300	300	12"	450	483	445	400	8‑M20 (PN10) / 12‑M24 (PN16)

*Note: Flanges according to GB/T 9119 PN10/PN16. ANSI, DIN options available on request.*

Applications

Mainline agricultural irrigation metering
Pump station discharge monitoring
River, lake, and reservoir water intake
Farm water management
Aquaculture supply
Reclaimed water / wastewater irrigation
Large irrigation district canals (DN250/DN300)

Selection Guide

1. Choose Diameter
Select based on your permanent flow rate (Q3). Recommended operating range: 70%‑100% of Q3.

DN250: Q3 = 630 m³/h → recommended 440‑630 m³/h

DN300: Q3 = 1000 m³/h → recommended 700‑1000 m³/h

2. Choose Accuracy (R‑ratio)

R50: standard

R80: higher sensitivity for low flow applications

3. Choose Temperature Class

T50: cold water ≤50°C

T90: hot water ≤90°C (accuracy ±3%)

4. Choose Material & Pressure

Standard: ductile iron + epoxy, PN10

High pressure: PN16

Corrosive media: bronze / stainless steel body

5. Choose Function

Basic: mechanical register only

Pulse output: reed switch / Hall sensor for remote reading

Smart: LCD + NB‑IoT / 4G for real‑time monitoring

6. Choose Flange Standard
Default: GB/T 9119 PN10/PN16. ANSI 150LB, DIN etc. available.

7. Check Installation Conditions

Straight pipe upstream ≥10×DN, downstream ≥5×DN

Flow direction arrow must match

Install a strainer if water contains large debris (especially for DN250/DN300)

Installation & Maintenance

1. Installation Tips:

Flush pipeline thoroughly before installation.
Install shut‑off valves before and after the meter.
Mount horizontally with register facing upward.
For large sizes (DN250, DN300), use lifting equipment and ensure pipe alignment to avoid stress on the meter body.

2. Maintenance:

Removable mechanism: The internal measuring unit can be extracted without removing the meter body – easy cleaning or replacement.
Periodically check register operation.
Close valves if meter is unused for long periods.
Protect from freezing in winter (drain or insulate).
Clean glass if fogging occurs.

Packaging & Shipping

Packaging: Bubble wrap + wooden crate (all large sizes DN250/DN300 in strong wooden crates).
Delivery time: Stock items 48h; custom orders (DN250/DN300) 7‑15 working days.
Shipping: DHL, FedEx, sea freight, or truck (DN250/DN300 recommended by truck).

FAQ

Q: What is the difference between a horizontal vane wheel meter and a standard water meter?
A: The horizontal vane (Woltmann) meter has an axial flow design, offering very low pressure loss and high flow capacity. Its vane shape is less sensitive to debris, making it ideal for irrigation.

Q: Can it be used in muddy water?
A: Yes, it tolerates sand and small fibers. For extremely muddy water, a pre‑filter or settling tank is recommended to prolong life.

Q: Can it really be used for sewage water?
A: It is suitable for agricultural wastewater and reclaimed water due to its wear‑resistant materials and anti‑clog design. For aggressive industrial effluent, an electromagnetic meter is recommended.

Q: What is the advantage of a removable mechanism?
A: You can service or replace the internal measuring part without dismantling the meter body – minimal downtime and easy maintenance.

Q: What is the difference between cold water and hot water versions?
A: Cold water (T50) ≤50°C, accuracy ±2%/±5%; hot water (T90) ≤90°C, accuracy ±3% over whole range.

Q: Does it need power?
A: Basic mechanical version needs no power. Pulse output and smart versions require external power or battery.

Q: How heavy are DN250 and DN300 meters?
A: DN250: ~60‑80kg; DN300: ~80‑100kg. Lifting equipment is necessary during installation. WINMETER can provide on‑site guidance if needed.