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Particle Counter Sensor
Ref. JWJ4
ISO cleanliness level in the hydraulic circuit, in real time.
1–100 µmmeasuring range
RSD < 5%repeatability
5–60 sdetection period
±1grade accuracy
Overview
Oil cleanliness watched inside the circuit itself
Based on the light-blockage principle, measures size, quantity and contamination level of solid particles in real time, with high resolution and repeatability.
What it measures
What it measures
Solid particles
1–100 µm / 4–70 µm (c)
Size, quantity and distribution of particles in the flow.
Cleanliness level
ISO 4406 · NAS 1638 · GJB420A/B
Contamination grade computed by the built-in standards.
Repeatability
RSD < 5%
Stable readings with strong immunity to interference.
How it works
Measurement principle
Light-blockage (photoresistance) principle: counts and sizes solid particles crossing an optical beam.
1
Flow through the optical cellOil passes through the sensor at 10–300 mL/min (25 mL/min recommended).
2
Light blockageA diode laser lights the flow and each particle blocks the beam.
3
Counting and sizingBlockage becomes size counts and a contamination grade.
4
OutputResults over RS485 MODBUS RTU or ASCII, every 5–60 s.
Technical data
Specifications
Code
JWJ4
Range
1–100 µm / 4–70 µm (c)
Size channels
1 / 2 / 5 / 10 / 15 / 25 / 50 / 100 µm
Cleanliness
ISO 4406 · NAS 1638 · GJB420A/B
Detection flow
10–300 mL/min (rec. 25)
Output
RS485 MODBUS RTU / ASCII
Power supply
DC 24 V ±10% · < 200 mA
Pressure
≤ 2 MPa · 2–40 MPa with pressure-reducing valve
Oil ports
G1/8 · Ø6 mm tubing
Dimensions / Weight
100×75×71 mm · 800 g
Protection
IP65
Full specifications in the official datasheet.
From the sensor to your system
Integration & Outputs
◉Particle Counter Sensorinstalled at the measurement point
⇄RS485 MODBUS RTU / ASCIIopen industrial protocol
🖥PLC / SCADAyour alarms and history, in your standard
RS485 MODBUS RTU / ASCII
Common questions
FAQ
What is the ISO 4406 code?
The standard that expresses oil cleanliness from particle counts by size. The sensor delivers the ISO 4406 grade directly, plus NAS 1638 and GJB420A/B.
How often does it measure?
The detection period is adjustable from 5 to 60 seconds, in continuous operation.
Where is it applied?
Hydraulic systems, turbines, aviation and transformers, among other critical circuits.
Which fluids does it monitor?
Hydraulic, lubricating, transformer (insulating), turbine, gear and engine oil, aviation kerosene and water-based hydraulic fluids, plus organic liquids and polymer solutions.
