AvCount3 Particle Counter – SA1100-3

AvCount3 Particle Counter for Skydrol – SA1105-0

The AvCount3 for Skydrol is a compact bench-top automatic particle counter, specifically designed to measure the particulate of Skydrol hydraulic fluid.

Skydrol is an advanced fire-resistant aviation hydraulic fluid that inhibits corrosion and prevents erosion damage to servo valves. It has been approved by most airframe manufacturers including Airbus, Boeing, and BAE Systems, and has been used in their products for over 40 years.

Due to the highly corrosive nature of Skydrol material this special version of the AvCount3 is fitted with Isolast seals and a protective inner case.

Methods: ASTM D7619; ASTM D7647; ASTM D975; IP 565; Defence Standard 91-091; Defence Standard 91-86; IP PM FA; GOST 17216; ISO 4406; ISO 60970; NAS 1638; SAE 4059


  • ISO 11171 calibration
  • Cumulative counts/ml
  • ISO 4406 cleanliness codes
  • Color touch screen
  • Dilution ratio calculation
  • Real-time display of test progress
  • User-programmable
  • LIMS, network, and VNC connectivity
  • Programmable alarm limits
  • User and sample identification
  • 14 embedded test methods
  • Integral printer
  • 500,000 test memory
  • In-field verification and calibration
  • FFKM seals, compatible with synthetic oils

Cost Savings

  • Low operator time due to simplicity of set up and automation, giving operators the option to work on something else and reduce labor costs
  • Small test volume, 10 ml (without flush), can reduce cost and waste
  • LIMS or network compatibility for quick result interpretation, increasing productivity
  • In-field calibration eliminates time and costs associated with sending the instrument to a service center

Ease of Use

  • Features a simple user interface with a touchscreen display
  • The fully-automated test means extensive operator training is not required before using the instrument
  • User-defined test methods are easily programmed

Enhanced Functionality

  • Dilution protocol for testing of high viscosity samples
  • Real-time display of test progress and ability to view previous results whilst running a sample
  • Password-protected levels for security
  • 14 embedded methods for fuel and oil testing
  • User and sample identification – track and trace

Precision and Accuracy

  • Fully automatic test sequence and consistent sample handling ensures test repeatability and reproducibility
  • ISO 11171 calibration protocol
  • Programmable alarm limits 
  • QC analysis allows analysis of results in accordance with ASTM D6299


Principle of operation

Laser obscuration

Test methods

14 embedded test methods, user-programmable including ASTM D7619; IP 565; ISO 4406; NAS 1638; SAE 4059; GOST 17216

Particle size range

ISO 11171: 4μm(c) to 70μm(c) (calibration for larger sizes available on request)

Test duration

Less than 3 minutes

Pressure (max)

Online pressure 10 bar gauge

Sample temperature range

Ambient 0 to 70 °C

Operating temperature range

Ambient 5 to 40 °C

Relative humidity (max)

80% @ 40 °C

Sampling method

Bottle sample and continuous

Programmable test method parameters (via PC)


Protocol (number of repeat measurements, flush volume before the first measurement, flush volume between measurements, flush between measurements)

Single or automated repeat tests, interval between repeat tests

Display and control system

Real-time test progress and results, touchscreen


Measuring channels

16 size channels displayed on the instrument, 4μm(c) to 70μm(c) and 2μm to 100μm (ISO 4402 sizes)

Counts per measurement (max)

60,000 per ml

Coincidence error limit

60,000 particles/ml ≥4μm(c) with ≤ 5% co-incidence error (ISO 11171)

Sample viscosity (max)

68 mm2/s (using an internal pump), 200 mm2/s (pressure fed @ 3 bar gauge) (SA1950-0 Sample Delivery System is available as an accessory)

Sample volume (typ)

80 ml for ASTM D7619 & IP 565, from 20 ml for other methods (includes flush cycles)

Sample delivery

Integral Dual Piston Pump (DPS) downstream of the cell

Sample flow rate

30 ml/min ±5 ml/min

Data Management

Results format

Cumulative, Particles/ml, ISO 4406 cleanliness codes/classesNumerical and graphical display


500,000 result memory
Print via internal printer, export to LIMS, USB or QR code


RJ45 Ethernet or USB

Number of calibration points

16 (MTD)

Power requirements


100/240 V, 50/60 Hz, Auto-sensing universal power supply


Size (HxWxD) / Weight

370 x 230 x 270 mm / 6 kg