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KF510 Inline Impeller Flow Sensor

The KF510 Inline Impeller Flow Sensor is commonly used for liquid flow measurement in industries such as water, petroleum, and chemicals, including water supply and drainage systems and hydraulic systems. It features a simple structure, easy installation, and wide application in industrial fields and laboratories. Its measurement principle is based on the fact that when fluid flows through the flow meter, it drives the impeller to rotate; the impeller’s rotational speed is positively correlated with the fluid velocity. The impeller drives a magnetoelectric device, converting the mechanical rotation into electrical pulse signals. By calculating the pulse frequency, the instantaneous or cumulative flow rate of the fluid is obtained.

It comes in two connection styles, making it suitable for almost any line: KF510-FA with flange connections (DN32 to DN250) and KF510-VA with threaded connections (DN10 to DN50). Together, they cover DN10 through DN250.

RFQ Paddle Wheel Flow Meters

Features

KF510 Inline Impeller Flow Sensor Thread Mount

Flange-threaded connection for easy installation;
Intuitive measurement with linear correlation between speed and flow rate;
High measurement accuracy; Accurate to ±1.5% FS, with ±0.5% repeatability.
Simple structure, easy maintenance, and low maintenance cost;
Can measure clean liquids such as water and oil, with a wide range and broad applicability;
Sensitive to flow rate changes, with rapid response and real-time reflection of flow velocity fluctuations.
Outputs 4-20 mA, pulse (passive) and RS485. Runs on DC24V or battery.
Corrosion-resistant wetted parts: PVDF/PTFE impeller, ceramic shaft and fluororubber (FKM) seal.

Working Principle

The KF510 Inline Impeller Flow Sensor works by using a flow meter to rotate an impeller as fluid flows through it. The impeller’s rotation speed is directly proportional to the fluid velocity. The impeller drives a magnetoelectric device, which converts the mechanical rotation into electrical pulse signals. By calculating the pulse frequency, the instantaneous or cumulative flow rate of the fluid can be determined.

Technical Parameters

Parameter	KF510-FA (Flange)	KF510-VA (Threaded)
Connection type	Flange	Threaded
Wetted materials	Impeller: PVDF, PTFE; Shaft: ceramic; Seal: fluororubber (FKM)	Impeller: PVDF; Shaft: ceramic; Seal: fluororubber (FKM)
Nominal bore	DN32 – DN250	DN10 – DN50
Velocity range	0.3 – 6 m/s	0.3 – 6 m/s
Accuracy	±1.5% FS (full scale)	±1.5% FS (full scale)
Repeatability	±0.5%	±0.5%
Ambient temperature	-20℃ ~ 65℃	-20℃ ~ 65℃
Medium temperature	-20℃ ~ 80℃	-20℃ ~ 80℃ (PVDF)
Working pressure	0.8 MPa or 1.0 MPa	0.8 MPa or 1.0 MPa
Display / housing size	100 mm × 100 mm	100 mm × 100 mm
Installation	Panel mount (cutout 95×95 mm); inline integral	Panel mount (cutout 95×95 mm); inline integral
Power supply	DC24V; optional battery	DC24V; optional battery
Output signal	4-20 mA + pulse (passive) + RS485	4-20 mA + pulse (passive) + RS485
Power consumption	2 W	2 W
Protection class	IP65	IP65

KF510 Inline Impeller Flow Sensor Flange Mounting Dimensions

Flange Model Selection – KF510-FA (DN32-DN250)

Code	Bore	Inch	Flow range (m³/h)	Working pressure	Dimensions L×D×K×H (mm)	Bolt holes N-Φd
32	DN32	1-1/4″	1 – 20	0.8 MPa	200×140×100×187	4-Φ18
40	DN40	1-1/2″	2 – 24	0.8 MPa	200×150×110×192	4-Φ18
50	DN50	2″	4 – 40	0.8 MPa	200×165×125×198.5	4-Φ18
65	DN65	2-1/2″	6 – 60	0.8 MPa	200×185×145×205	4-Φ18
80	DN80	3″	10 – 100	0.8 MPa	200×200×160×212	8-Φ18
100	DN100	4″	15 – 150	0.8 MPa	250×220×180×222	8-Φ18
125	DN125	5″	20 – 200	0.8 MPa	250×250×210×233	8-Φ18
150	DN150	6″	40 – 400	0.8 MPa	300×285×240×247	8-Φ18
200	DN200	8″	60 – 600	0.8 MPa	350×340×295×267	8-Φ18
250	DN250	10″	100 – 1000	0.8 MPa	400×395×350×287	12-Φ22

Dimensions per manufacturer datasheet: L = face-to-face length, D = flange outer diameter, K = bolt-circle diameter, H = height. N-Φd = number of bolt holes × bolt-hole diameter (e.g. 4-Φ18 = 4 holes of Ø18 mm).

KF510 Inline Impeller Flow Sensor Thread Mounting Dimensions

Threaded Model Selection – KF510-VA (DN10-DN50)

Code	Bore	External thread	Flow range (m³/h)	Working pressure	A (mm)	B (mm)
10	DN10	G3/8″	0.1 – 1.8	1.0 MPa	152	121
15	DN15	G1/2″	0.2 – 4	1.0 MPa	152	130
20	DN20	G3/4″	0.3 – 6	1.0 MPa	158	134
25	DN25	G1″	0.5 – 12	0.8 MPa	158	141
40	DN40	G1-1/2″	2 – 24	0.8 MPa	168	175
50	DN50	G2″	4 – 40	0.8 MPa	184	175

A and B are overall dimensions as listed in the manufacturer datasheet.

Application Industries

The KF510 measures liquid flow across a wide range of industries:

Petrochemical Industry
Metallurgical Industry
Textile Industry
Pharmaceutical Industry
Semiconductor Industry
Food and Beverage Industry
Paper and Pulp Industry
Power Plants
Urban Water Supply and Drainage
Environmental Protection
New Energy Industry
Shipbuilding Industry

Order Guide

Order code structure (8 fields): Series – Installation – Bore – Connection – Function – Power – Alarm – Unit

Flange example: KF510-FA-A-32-3-AT-1-4-1 | Threaded example: KF510-VA-A-10-1-AT-1-1-1

Field	Options
Series	KF510-FA = flange connection; KF510-VA = threaded connection
Installation	A = Integral (compact); B = Remote (separate / split)
Bore	Per selection table – Flange: 32-250; Threaded: 10-50
Connection	Flange: 1 = GB flange, 2 = ANSI flange, 3 = JIS flange. Threaded: 1 = G thread, 2 = NPT thread
Transmitter function	AT = instantaneous + totalized flow; AF = + current (4-20 mA) output; AC = + pulse output; AD = + RS485
Power	1 = Battery (no signal output); 2 = DC 24V
Alarm	1 = High-limit alarm; 2 = Low-limit alarm; 3 = Batch / dosing control; 4 = No alarm
Flow unit	1 = L/s, 2 = L/min, 3 = L/h, 4 = m³/s, 5 = m³/min, 6 = m³/h, 7 = G/s, 8 = G/min, 9 = G/h (G = gallon)

Connection codes follow the order listed in the manufacturer datasheet. Confirm flange standard (GB / ANSI / JIS) and rating with the supplier when ordering.

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Zhang Wei

Zhang Wei, possesses 20 years of experience as an automation instrumentation engineer, specializing in the research, design, installation, commissioning, and maintenance of automation instruments.

Face to various instrument communication protocols (such as Modbus, Profibus, etc.), with solid hardware circuit design and software programming skills (proficient in C language and PLC programming). Has extensive project experience; projects he has led and participated in have all achieved outstanding results, improving product accuracy, reducing costs, and increasing production efficiency.

Possesses excellent communication and coordination skills and a strong team spirit, enabling him to quickly respond to customer needs and provide high-quality automation instrumentation solutions.