Fluke 985 Airborne Particle Counter

The Fluke 985 Airborne Particle Counter is a precision instrument designed for monitoring and classifying airborne particulate matter in controlled environments. Used widely in HVAC commissioning, cleanroom validation, and industrial hygiene, this handheld device provides real-time particle concentration data across six size channels. Its isokinetic sampling probe ensures representative measurements, while the built-in laser diode and dual-mode counting capability make it a versatile tool for technicians and engineers who need reliable air quality data.

Fluke 985 Key Features

The Fluke 985 delivers comprehensive particle analysis with six size channels ranging from 0.3 μm to 10.0 μm, allowing detailed classification of airborne contaminants. The instrument operates at a sample flow rate of 0.1 cfm (2.83 L/min) using a 775 nm to 795 nm, 90 mW class 3B laser diode. Counting modes include raw counts and concentration calculations in #/m³, #/ft³, and #/liter, available in both cumulative and differential formats. With 50% counting efficiency at 0.3 μm and 100% efficiency for particles above 0.45 μm per ISO 21501, the Fluke 985 meets industry standards for accuracy. Additional features include a 10,000-record rotating data buffer, adjustable delay time from 0 to 24 hours, and dual communication options via USB or Ethernet for seamless data transfer.

• Channels: 0.3 μm, 0.5 μm, 1.0 μm, 2.0 μm, 5.0 μm, 10.0 μm
• Flow rate: 0.1 cfm (2.83 L/min)
• Light source: 775 nm to 795 nm, 90 mW class 3B laser
• Count modes: Raw counts, #/m³, #/ft³, #/liter (Cumulative or Differential)
• Counting efficiency: 50% @ 0.3 μm; 100% for particles > 0.45 μm (per ISO 21501)
• Zero count: 1 count / 5 minute (JIS B9921)
• Concentration limits: 10% at 4,000,000 particles per ft³ (per ISO 21501)
• Data storage: 10,000 records (rotating buffer)
• Alarms: Counts, low battery, sensor fail
• Delay time: 0 to 24 hours
• Sample inlet: Isokinetic probe
• Security: Administrator password control (optional)
• Communication mode: USB or Ethernet
• Dimensions (L x W x D): 27.2 x 9.9 x 5.3 cm (10.7 x 3.9 x 2.1 in)
• Weight: 0.68 kg (1.5 lb)
• Power adapter: 100 V AC to 240 V AC, 12 V DC, 2.5 A
• Rechargeable battery: Li-ion 7.4 V 2600 mAh; 10 hours typical use (5 hours continuous sampling) / 3.5 hours
• Calibration: PSL particles in air (NIST traceable)
• Operating environment: 50°F to 104°F (10°C to 40°C) / < 95% non-condensing relative humidity
• Storage environment: 14°F to 122°F (-10°C to 50°C)/Up to 98% non-condensing relative humidity
• Warranty: One-year
• Accessories included: Cradle for charging and convenient USB and Ethernet communications, ENET CAT5E 7 foot cable, USB-A to MINI-B 6 foot cable, 12 V dc power supply, zero count inlet-filter, filter adapter, sample inlet protective cap, hard case, getting started manual and users manual CD

Fluke 985 Specifications