Oil cleanliness sensor

Model：WJ-4

Brand：fengtu

Oil cleanliness sensor uses photoresist method to quickly and accurately detect oil contamination levels and output particle count and contamination level....

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1、Oil cleanliness sensor Product Introduction

Oil cleanliness sensor uses photoresist method to quickly and accurately detect oil contamination levels and output particle count and contamination level.Oil cleanliness sensor WJ-4 is a sensor designed to monitor the size, quantity distribution, and corresponding contamination level of particles within an oil sample. It offers numerous advantages, including rapid detection speed, strong anti-interference capabilities, high precision, and excellent repeatability; its high-precision sensor ensures both high resolution and accuracy.

2、Oil cleanliness sensor Application Areas

Hydraulic power units, gearboxes, diesel engines, turbines, air compressors, and similar equipment.

3、Oil cleanliness sensor Applicable Oils

Industrial Lubricants: Hydraulic oil, gear oil, turbine oil, transformer oil.

Engine Oils: Diesel engine oil, aviation engine oil.

Light Fuels: Gasoline, kerosene, aviation fuel.

4、Oil cleanliness sensor Measurement Principle

Oil cleanliness sensor employs the Light Extinction method (also referred to as the Extinction or Light Blockage method)—as prescribed by ISO 4402 and ISO 11171—to assess fluid contamination levels.

A parallel light beam passes perpendicularly through a sample flow cell with a cross-sectional area of A, striking a photoelectric receiver. When the fluid stream contains no particles, the circuit outputs a voltage of E. When a particle with a projected area of a passes through the flow cell, it obstructs the parallel beam, causing the transmitted light to attenuate; at this moment, the circuit outputs a negative pulse with an amplitude of E。: E。=-(a/A)×E。

If the particle is spherical—or is characterized by an equivalent diameter d—and E equals 10 V, then E。=-7.854×d/A; that is, the projected area of the particle and the amplitude of the pulse voltage exhibit a linear relationship.

5、Oil cleanliness sensor Technical Parameters

Measurement indicators
Detection range	1～100μm			4～70μm
Measurement channel	1µm, 2µm, 5µm, 10µm, 15µm, 25µm, 50µm, 100µm
	4µm(c); 4.6µm(c); 6µm(c); 10µm(c); 14µm(c); 21µm(c); 38µm(c); 70µm(c)
Detect flow rate	10～300mL/min recommended to use 25mL/min
Inspection cycle	5～60S (5S/gear)
Measurement repeatability	RSD<5%
Measurement accuracy	Number of particles ±20% (or ±1 cleanliness grade)
Built-in grade standards	NAS1638, ISO4406, GJB420A, GJB420B
Electrical parameters
Digital signal output		RS485 MODBUS RTU/ASCII code
Working voltage		DC24V±10%
Working current		＜200mA
Light source type		Semiconductor laser
Temperature parameters
		Working temperature		Fluid temperature		Storage temperature
		-20～60℃		-20～125℃		-40～85℃
Structural parameters
		In and out of the oil interface		Protection level		Size
		G1/8-Φ6 with an outer diameter of 6mm low-pressure swivel hose.		IP65		101mm148mm71mm
Other parameters
		Allow oil pressure				Sensor weight
		≤2MPa, 2～40MPa (with pressure reducing valve)				165g
Communication protocol-wire;
Red	Black		Brown		Blue		——
DC24V+	DC24V-(GND)		RS485A/+		RS485B/-		——