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distinctive blue light.  This makes it
readily apparent that the ionizer has
its settings locked, preventing
unauthorized adjustment.

• 

AIRFLOW

- this display indicates

relative airflow output from the fans.
If the key switch is in the "SET"
position and the "+" or "-" button are
pressed and held, the fan speed will
increase or decrease with a
corresponding change in the
AIRFLOW display.  As fan speed is
increased, the display will move to
the right.

• MINOR ADJUSTMENTS
ACCESS

- each fan zone may be

balanced separately. The adjustments
are designed for minor corrections to
balance one fan to another.  Overall
balance adjustments should be done
with the "BAL" switches on the end
panel.

• 

VR6, VR5, VR2, and VR1

- are

the zone balance adjustments for the
zones 1 through 4 respectively.
Zone 1 is closest to the right end.  
24" models will only have VR6 and
VR5 adjustments. These adjustments
are covered in the section titled
"Calibration Instructions".
• 

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
analyzer 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 61340-5-2:1
paragraph 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

TB-6529

Page 5 of 9

© 2007 DESCO INDUSTRIES INC.

Employee Owned

Содержание 50606

Страница 1: ...D IONIZER OWNER S MANUAL Made in America DESCO EMIT WEST 3651 Walnut Avenue Chino CA 91710 909 627 8178 Fax 909 627 7449 DESCO EMIT EAST 90 Hudson Road Canton MA 02021 1407 781 821 8370 Fax 781 575 0172 Web Site DescoEMIT com 2007 DESCO INDUSTRIES INC Employee Owned ...

Страница 2: ... on process necessary insulators and isolated semiconductors Some examples of process necessary insulators are the PC board itself plastic test stands plastic housing where a PCB may be mounted as well as computer monitor screens and regular cleaning wipes Examples of floating or isolated conductors are loaded PCB mounted in a stand where the pins are not contacting the dissipative workstation Ion...

Страница 3: ...be daisy chained Fuse 5x20mm 3 amp time lag Air Flow 80 170 CFM 24 model 160 340 CFM 48 model Emitters 100 Tungsten replaceable Ionization Type Steady state DC Balance 0 10 volts at set up at 24 above charged plate analyzer Weight 6 2 lbs 24 model 11 1 lbs 48 model Size 2 x 6 x 24 2 x 6 x 48 Mounting 2 mounting holes each end Installation The Desco EMIT s C E ionizer is designed to mount above the...

Страница 4: ...are used to adjust the balance of the ionizer and are used in conjunction with a charged plate analyzer Pressing the symbol will shift the balance offset positive while pressing the symbol will shift it negative Adjustment should be made with a charged plate analyzer located 24 directly under the ionizer The BAL controls like the FAN speed are only adjustable when the key switch is in the SET posi...

Страница 5: ...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 o...

Страница 6: ... straight out of the ionizer The Replaceable Emitter Cassettes can then be replaced with a spare cassette or removed to another area for cleaning Cleaning of the Replaceable Emitter Cassette can be accomplished with a stiff brush or lint free swab and isopropyl alcohol or other residue free cleaning solvent The Replaceable Emitter Cassettes or the individual removable tungsten emitters can also be...

Страница 7: ...te of CPA Do this for all fans Ionizer that is over 18 will have a slightly higher decay time Adjust Alarm Setting 1 Turn VR3 counter clockwise to where the alarm starts or when the status LED turns RED While turning VR3 clockwise count how many turns until unit starts alarming again Divide that number of turns in half and subtract 3 5 turns to give you the number of turns you need to turn VR3 cou...

Страница 8: ...arged plate analyzer under any of the fans push and hold the BAL switch to find its most positive point use the BAL switch to find its most negative point calculate the midpoint and set the balance using the BAL buttons to that point Example if the most positive point is 40V and its most negative point is 10V you would set the balance to 15V 5 Adjust each fan s output by placing the charged plate ...

Страница 9: ...to defects or damage due to accidents neglect misuse alterations operator error or failure to properly maintain clean or repair products Limit of Liability In no event will Desco EMIT or any seller be responsible or liable for any injury loss or damage direct or consequential arising out of the use of or the inability to use the product Before using users shall determine the suitability of the pro...

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