Distributor of Desco: Excellent Integrated System Limited
Datasheet of 60480 - EMITTER BOARD O'HD IONIZER PAIR
Contact us: [email protected] Website: www.integrated-circuit.com
TB-2087
Page 5 of 8
•
VR3 and VR4
- are adjustments to center the alarm
and to change the alarm sensitivity. These
adjustments are covered in the section titled
"Calibration Instructions".
•
ALARM SWITCH
- this switch provides an audible
alarm to supplement the flashing red PWR light
when the unit needs cleaning.
Operation
After the unit is mounted securely and connected to a
properly wired outlet, turn the key switch to the set
position. The performance of the ionizer is directly
related to the airflow on the area to be protected.
Generally, try to use the highest setting possible
without disturbing the operator or the work in process.
After allowing the unit to run for several minutes, a
charged plate analyzer can be used to check the
balance and performance. We recommend doing this
at the time of the initial installation, so that data can be
collected and saved for future reference. Place the
charged plate monitor directly under each fan and
record the float (balance) voltage. If all fans are offset
slightly in the same direction, the (+) or (-) BAL
buttons can be used to correct the offset. If the
balance varies from a positive offset to a negative
offset between fans, the individual fan zone controls
can be touched up slightly as required.
It is not uncommon to find differences between ionizers
from bench to bench or even between fans on ionizers
during initial setup. This is often caused by the
presence of objects on or around the bench. Large
metal objects nearby or machines or equipment on the
bench will often cause a shift in the offset voltage at
that area. The individual zone controls of the C/E
ionizers allow this to be compensated for during initial
setup.
After balance offsets have been checked, the decay
performance of each fan should be measured and
recorded. This information will be useful to establish a
maintenance schedule. When decay times begin to
increase significantly, or if the red PWR light begins to
flash, emitter cleaning is usually indicated. By
recording the time intervals between the first few
cleanings, a maintenance schedule can be developed.
After initial setup and testing has been done, the key
switch can be set to the LOCK position and normal
workstation use resumed.
If the ionizer is used in a manner not specified by
the manufacturer, the protection provided by the
ionizer may be impaired.
Maintenance
"As with all ionizers, periodic maintenance will be
needed to provide optimum performance." (Reference:
IEC 61340-5-2:1paragraph 5.2.9).
The frequency of monitoring ionizers really depends on
how and where they are used. Since the majority of
them use a fan to transport the ions to the working
area, the cleanliness of the air directly affects their
performance over time and how often the emitters
should be cleaned.
EIA-625 recommends checking ionizers every 6
months, but this may not be suitable for many
programs particularly since an out-of-balance may
exist for months before it is checked again. ANSI/ESD
S20.20 paragraph 6.1.3.1 Compliance Verification Plan
Requirement states: "Test equipment shall be selected
to make measurements of appropriate properties of the
technical requirements that are incorporated into the
ESD program plan." And paragraph 6.1.3.2.
Compliance Verification Plan Guidance states: "In
addition to internal audits, external audits
(Organization and supplier of ESDS items) should be
performed to ensure compliance with planned
requirements. Verifications should include routine
checks of the Technical Requirements in the Plan.
The frequency of verification checks should be based
on the control item usage, its durability and associated
risk of failure."
Under normal conditions the ionizer will attract dirt and
dust (especially on the emitter and fan guards). To
maintain optimum performance, cleaning must be done
on a regular basis. The electrodes should be cleaned
at least every 6 months. However, more frequent
cleaning may be required if used in environments with
more contaminants.
This was a major factor in the design process of the
C/E ionizer. The Replacement Emitter Cassette can
be removed to another area, and the emitters are then
very accessible. Although we could not eliminate the
maintenance, we have made it far easier and to clean
than ever before.
• Turn the key switch to the OFF position.
• Grasp the Replaceable Emitter Cassette ejector
levers at the center and pivot outward about 90
degrees.
• Grasping the right and left corners, pull the
Replaceable Emitter Cassette straight out of the
ionizer.
DESCO WEST
- 3651 Walnut Avenue, Chino, CA 91710 • (909) 627-8178 • Fax (909) 627-7449
DESCO EAST
- 90 Hudson Road, Canton, MA 02021 • (781) 821-8370 • Fax (781) 575-0172 • Web Site: http://www.desco.com
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