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3.4.3.2 Sample probe guidelines
3.5 Wiring safety information
The position of an isokinetic probe is very important for count accuracy. Refer to the
sampling guidelines and
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
•
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.
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
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.
Figure 4 on page 9
before installation.
5.
Installation
Figure 4 on page
9).
17
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