3.4.3.2 Sample probe guidelines
The position of an isokinetic probe is very important for count accuracy. Refer to the sampling guidelines and Figure 4 on page 9 before installation.
Sampling guidelines
• Keep the sample probe a minimum of 12 inches from loose materials, dust, liquids and sprays.
• Keep the sample probe a minimum of 12 inches from potential contamination sources such as an instrument exhaust fan.
• Laminar flow—install at least 1 sample probe per 25 sq. ft. of surface area.
• Turbulent flow—install at least 2 sample probes per clean room.
• Position the sampling probe to face the direction of flow (refer to Figure 4 on page 9).
• Powders will contaminate the sensor and cause incorrect results or a counter failure.
• Liquids will contaminate the internal optics of the sensor and change the calibration of the counter. Liquids can be suspended in air in the form of oil droplets.
• The vapors from drying adhesives or other chemicals can permanently coat the sensor optics or other internal parts.
• All types of smoke will contaminate the sensor.
• Vapors that contain corrosives will quickly cause permanent damage to the optics or electronics of the counter.
3.5 Wiring safety information
When making any wiring connection to the instrument, obey the warnings and notes that follow. Obey all warnings and notes in the installation sections. For more safety information refer to section 2.1 on page 5.
Important Note: Always remove power to the instrument before an electrical connection is made.
Electrostatic discharge (ESD) considerations
To keep hazards and ESD risks to a minimum, remove power to the instrument when a maintenance procedure does not require power.
Internal electronic components can be damaged by static electricity. This damage can cause degraded instrument performance or instrument failure.
To prevent ESD damage to the instrument, complete the following steps:
• Before touching an electronic component, discharge static electricity from the body.
Touch an earth-grounded metal surface such as the chassis of an instrument or a metal conduit or pipe.
• To keep static build-up to a minimum, avoid excessive movement. Transport static-sensitive components in anti-static containers or packaging.
• To discharge static electricity from the body and keep it discharged, wear a wrist strap connected by a wire to earth ground.
• Handle all static-sensitive components in a static-safe area. If possible, use anti-static floor pads and work bench pads