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LFP Series RF Capacitance Level Transmitter

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Product introduction

The RF capacitance level transmitter operates based on the principle that changes in material or liquid level cause a change in capacitance. The probe and the conductive tank wall form an equivalent capacitor. When the probe is in air, the capacitance (CA) is low. As material fills the tank and adheres to the probe, the capacitance increases. When the tank is full and the probe is completely covered, the capacitance reaches its maximum (CB). The measurable range is the difference in capacitance (ΔC = CB - CA), recommended for use within ΔC = 25 to 2000 pF.

Key Features Composition Structure Standard Size 1 Standard Size 1 Selection Table

Low power consumption, easy wiring (2-wire system)

Max. current consumption: 20mA

Excellent linearity (<±1% FS or ±0.5pF)

Temperature compensation, low temp. coefficient (±0.2% FS/°C or 0.1pF/°C)

Easy two-point calibration

No blind zones, suitable for all types of tanks

Resistant to high temperature, high pressure, and corrosive environments

On-site LED display

Model	LFP10 (Rod, PP-coated)	LFP20 (Rod, PP-coated)	LFP21 (High-temp Rod, PFA-coated)
Sensing Material	SUS304 cable + PP coating	SUS304 cable + PFA coating	SUS304 + PFA coating
Ambient Temp.	-40~85°C	-40~85°C	-40~85°C
LCD Display Temp.	-20~85°C	-20~85°C	-20~85°C
Operating Temp.	-40~85°C	-40~85°C	-40~200°C
Operating Voltage	18~30VDC	18~30VDC	18~30VDC
Analog Output	4~20mA (2-wire)	4~20mA (2-wire)	4~20mA (2-wire)
Digital Output	HART (optional)	HART (optional)	HART (optional)
Detection Range	20~2000pF	20~2000pF	20~2000pF
Accuracy	±1% FS or ±0.5pF	±1% FS or ±0.5pF	±1% FS or ±0.5pF
Temp. Effect	<±0.2% FS/°C or 0.1pF/°C	<±0.2% FS/°C or 0.1pF/°C	<±0.2% FS/°C or 0.1pF/°C
Enclosure Protection	IP65	IP65	IP65
Process Connection	1"PT or 1"x5kg/cm²	1"PT or 1"x5kg/cm²	1"PT or 1"x5kg/cm²
Weight	Approx. 2.3kg (1m)	Approx. 2.3kg (1m)	Approx. 2.8kg (1m)
Pressure	32kg/cm²	32kg/cm²	32kg/cm²
Note: High-temperature rod versions must use PFA coating (Model LFP21 series).

Model	LFP30 (Cable, PP-coated)	LFP31 (High-temp Cable, PFA-coated)	LFP40 (Standard Rod Type)
Sensing Material	SUS304 cable + PP coating	SUS304 cable + PFA coating	SUS304 + PFA or PP
Ambient Temp.	-40~85°C	-40~85°C	-40~85°C
LCD Display Temp.	-20~85°C	-20~85°C	-20~85°C
Operating Temp.	-40~85°C	-40~200°C	-40~85°C (customizable to 200°C)
Operating Voltage	18~30VDC	18~30VDC	18~30VDC
Analog Output	4~20mA (2-wire)	4~20mA (2-wire)	4~20mA (2-wire)
Digital Output	HART (optional)	HART (optional)	HART (optional)
Detection Range	20~2000pF	20~2000pF	20~2000pF
Accuracy	±1% FS or ±0.5pF	±1% FS or ±0.5pF	±1% FS or ±0.5pF
Temp. Effect	<±0.2% FS/°C or 0.1pF/°C	<±0.2% FS/°C or 0.1pF/°C	<±0.2% FS/°C or 0.1pF/°C
Enclosure Protection	IP65	IP65	IP65
Process Connection	1"PT or 1"x5kg/cm²	1"PT or 1"x5kg/cm²	1"PT or 1"x5kg/cm²
Weight	Approx. 2.3kg (1m)	Approx. 2.3kg (1m)	Approx. 2.8kg (1m)
Pressure	32kg/cm²	32kg/cm²	32kg/cm²
Note: High-temperature cable models must use PFA coating (Model LFP31 series).

LFP-	N	1	TD	4	Q	1	L0	T	P	Detailed
LFP-										Right Column (LFP Series RF Capacitance Level Transmitter)
Certification	N									Non-Ex-proof
	I									Intrinsically Safe: Ex ia IICT4/T6 Ga/Gb
	D									Explosion-Proof: Ex d IICT4/T6 Ga/Gb
输出方式		1								24VDC, Output: 4-20mA (2-wire)
输出方式		2								24VDC, Output: 4-20mA + HART (2-wire)
Process Connection			TD							3/4" PT Thread
			TE							G1 Thread
			TG							1" PT Thread (Standard)
			FA							DN25 PN1.6 RF Flange
			FD							DN50 PN1.6 RF Flange
			SS							Special thread (≥3/4") or flange (≥DN25) available
Wetted Material				4						SUS304 + PFA
				6						SUS304 + PTFE (Sintered)
				7						SUS304 + Ceramic (200–600°C)
				8						SUS316 + Ceramic (200–600°C)
				9						SUS310S + Ceramic (200–1100°C)
Housing Material					A					Aluminum alloy with coating
Electrical Interface						1				M20* 1.5
						2				1/2NPT
						3				Special available
Insertion Length							L0			Rod Type: Standard (300–500mm)
							LA			Extended (500–3000mm)
							LB			Cable Type: Extended (3000–10000mm)
							LC			Compact Rod (150–300mm)
							LD			Flat Plate Type
							L...			Custom
Temperature Range								T		Temperature：-40-80℃
Temperature Range								T...		Other max values available (Max 260°C)
Pressure Range									P	Normal pressure
Pressure Range									P...	Custom pressure values (bar)
Note: This selection table is for technical reference only. Final factory model codes will reflect selected options.

Shanghai Kayuan Electronic
Technology Co., Ltd.

Shanghai Kayuan Electronic Technology Co.,Ltd is an enterprise specializing in the production and R & D of industrial sensors and controllers. Its main products include switches and sensors for flow, pressure, temperature, and liquid level.

In 2008, our assembly plant was established in Shanghai China,PAKU INTELLIGENT EQUIPMENT(SHANGHAI)CO.,LTD a subsidiary of Kayuan to produce the PAKU series of products. We adopt advanced technology and manufacturing processes across the board. With our professional design and production technology, comprehensive product lines, excellent quality, and sales network services, we can not only provide users with timely and professional technical support but also offer high - quality one - stop services.

The company has set up various departments such as the purchasing department, R & D department, quality management department, finance department, sales department, after - sales department, general office, laboratory, archive room, calibration workshop, production workshop, inspection area, storage area, shipping area, and tea break rooms, aiming to provide products of excellent quality and sincere services.

We adhere to the customer - centric concept of creating value for customers. According to the industry needs of customers, we continuously update technology and optimize services, aiming to become a leader in the field of process automation.

PAKU products are now widely used in different industries, including automation complete sets of equipment, petroleum equipment, chemical equipment, power equipment, welding equipment, steel equipment, metallurgical equipment, automobiles, and water treatment. We have served many customers at home and abroad, and our products are sold to countries such as Canada, the United States, Brazil, Indonesia, Vietnam, Thailand, and Russia.

In the increasingly competitive global market in the future, PAKU will, as always, serve a wide range of domestic and foreign customers with excellent quality, reasonable and competitive prices, on-time delivery, and perfect after-sales service. We welcome extensive cooperation with OEM and ODM customers.