Handheld Airborne Particle Counter
Model 227A/227B

Applications
? Monitor and verify cleanrooms
? Test filters in place
? Track down particle sources
? Monitor: LAF and biohazard benches; Cleanroom laundries; HVAC systems; Computer rooms; Food and beverage packaging; Hospitals: Pharmacy and surgery; Indoor Air Quality (IAQ); Aerospace Assembly; Medical Device Assembly; Automotive: Paint spray booths; Filter performance

The Model 227 Portable Airborne Particle Counter offers the features and sensitivity of larger instruments and easy handheld operation. Weighing only two pounds, the Model 227 features a sensitivity of 0.3 micron (227B) or a sensitivity of 0.5 micron (227A), is fully self-contained, and uses reliable laser diode technology. It connects to a remote printer or computer, and can be part of a facility-monitoring system.
The Model 227 counts two sizes of particles simultaneously. Sample times can be set for up to 24 hours. Count data are stored in memory for easy transfer to a printer or computer. To make the most of its portability, the Model 227 features several counting modes for quick analysis of cleanroom conditions. The concentration mode gives a continuously updated approximation of the number of particles per cubic foot or per liter. The approximation is based on a user-selectable sample period of one to ten seconds. In the auto mode, it automatically takes a specified number of samples and stops, allowing unattended operation. The average mode calculates the average, minimum, and maximum count after a specified number of samples.
In beep mode, the Model 227 sounds a beep each time it counts a specified number of particles. This is useful for locating leaks in filters.
To protect your cleanroom, the Model 227 contains an exhaust filter. The pump and sensor are turned off when the battery charge drops below a safe operating level, maintaining power to preserve data stored in memory. The Met One Model 227: a handful of information.

Specifications

• Size Channels (¥ìm): 227A ch1 0.5
  ch2 selectable-0.7, 1.0, 3.0, or 5.0
  227B ch1 0.3
  ch2 selectable-0.5, 1.0, 3.0, or 5.0
  
• Flow Rate: 0.1 cfm (2.83 Ipm)
  
• Light Source: Laser diode (30,000 hours mean time between failure)
  
• Factory Calibration: Mono-dispersed polystyrene spheres (NIST traceable)
  
• Display: 4-line LCD, 7 digits
  
• Outputs: RS232C/RS485 for computer or printer
  
• Location Labels: 100, appear on printout
  
• Data Storage: 200 samples, rotating buffer
  
• Sample and Hold Times: 1 second to 24 hours
  
• Count Alarms: 1 to 9,999,999 each channel
  
• Concentration Mode: 1 second samples, 1 to 10 samples averaged, display updated every second; displays counts/ft3 or liter
  
• Power AC: adapter or internal battery pack
  
• Battery: Rechargeable NiMH
  
• Battery Recharge Time: 90% in 10 hours: 100% in 12 hours
  
• Operating Time: 8 hours continuous
  
• Size: 4" wide x 6.9" high x 2.3" deep (10.3 x 17.5 x 5.9 cm)
  
• Weight: 2.1 Ibs (0.97 kg)
  
• Environment Operating: 55 to 84¡ÆF (12 to 29¡ÆC),
  20 to 95% relative humidity, non-condensing
  Storage -40 to 160¡ÆF (-40 to 70¡ÆC),
  up to 98% relative humidity, non-condensing
  
• Accessories Included: Isokinetic Probe (direct mount); Purge Filter; Recharger Stand; AC Adapter; Operator's Manual
  
• When ordering, specify:
  Basic Sensitivity 0.3 micron (227B) or 0.5 micron (227A)
  Power (AC) AC adapters for 100 VAC, 115 VAC, or 230 VAC

Optional Accessories

• Relative Humidity/Temperature Sensor
• High Pressure Diffuser
• Particle Vision PortAll Software
• Printer, external
• Carrying/Shipping Case