Desco TB-2016 Service manual

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DESCO WEST - 3651 Walnut Avenue, Chino, CA 91710 • [phone] • Fax [phone]
DESCO EAST - One Colgate Way, Canton, MA 02021-1407 • [phone] • Fax [phone] • Website: Desco.com
TB-2016 Page 1 of 5 © 2012 DESCO INDUSTRIES, INC.
Employee Owned
Made in the
United States of America
Bench Top Blower Ionizer
Installation, Operation and Maintenance
Description
This ionizing unit is a self-balancing bench top ionizer. The
ionizer’s patented (US Patent 5,008,594) Faraday Balance
System assures low offset voltage or balance automatically.
It offers greater efficiency and easier cleaning than
conventional ionizers. The Bench Top Ionizer is designed
to neutralize static electricity from insulators and isolated
conductors in localized work areas in assembly rooms, wave
solder lines, laboratories, QC, test stations, packing and
shipping areas and clean rooms.
Ionizers are useful in limiting electrostatic charge generation,
ElectroStatic Discharge, and ElectroStatic Attraction, as
well as preventing equipment latch-up. ANSI/ESD S20.20
Paragraph 6.2.3.1 Protected Areas Requirement states:
“Ionization or other charge mitigating techniques shall be
used at the workstation to neutralize electrostatic fields on
all process essential insulators if the electrostatic field is
considered a threat.” 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. Ionization is not effective on items that have
large capacitance, like people and carts; however, ionizers
should be considered as a method for charge neutralization
in cases where grounding cannot be achieved.
Air ionization can neutralize the static charge on insulated
and isolated objects by producing separate charges in
the molecules of the gases of the surrounding air. When
an electrostatic charge is present on objects in the work
environment, it will be neutralized by attracting opposite
polarity charges from the ionized air. Note that ionization
systems should not be used as a primary means of
charge control on conductors or people. (Reference: IEC
61340-5-2:1 paragraph 5.2.9).
January 2012
Ionizer Selection
ANSI/ESD S20.20 section 6.1.1.2. ESD Control Program
Plan Guidance states: “The Plan should include a listing of
the specific type of ESD protective materials and equipment
used in the Program.” When selecting an ionizer, life cycle
costs should be considered, including:
- equipment cost
- installation cost
- operation and maintenance cost
The Desco Bench Top Blower Ionizer is available in the
following models:
Item Voltage Power Cord
19500 120V North America
19520 220V None
TECHNICAL BULLETIN TB-2016
Figure 1. Desco Bench Top Blower Ionizer
Packaging
1 Bench Top Blower Ionizer
1 Power Cord, 6' (19500 only)
1 Cleaning Brush
1 Filter and Guard Assembly
1 Certificate of Calibration
Installation
The unit is normally mounted at one end of a workbench or
area to be neutralized. It may also be mounted to a wall or
shelf. The ionizer’s neutralization (discharge) times will be
best from approximately 6" to 42" in front of the unit and will
drop off as the distance from the unit increases.
18"
12"
42"
6"
Figure 2. Area of optimum charge neutralization

DESCO WEST - 3651 Walnut Avenue, Chino, CA 91710 • [phone] • Fax [phone]
DESCO EAST - One Colgate Way, Canton, MA 02021-1407 • [phone] • Fax [phone] • Website: Desco.com
TB-2016 Page 2 of 5 © 2012 DESCO INDUSTRIES, INC.
Employee Owned
Mount the unit in the desired position. You can bolt the
stand to a wall or under a shelf as desired. For best results,
the unit should be mounted so that no obstructions exist
between the output area and the area to be neutralized.
of the technical requirements that are incorporated into
the ESD program plan.” And section 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 and
accumulate dirt and dust (especially on the emitter
electrodes). To maintain optimum performance, cleaning
must be performed on a regular basis. The electrodes
should be cleaned at least as often as indicated in the next
section. However, more frequent cleaning may be required if
used in environments with more contaminants.
METHOD 1 (Every 6 months)
The Bench Top Blower Ionizer comes with an easy-cleaning
brush which should be stored in a convenient location.
Disconnect power to the ionizer. Then slide the brush
through the grill and across the electrodes several times to
remove the dirt and dust.
Figure 3. Wall or shelf mounting of the ionizer
Set both front panel rocker switches in the “off” position.
Connect the IEC plug into the connector on the back panel
of the ionizer, press firmly to ensure that the cord is properly
attached. Install the power cord into a properly grounded
outlet. The ionizer must be grounded for proper operation.
Desco recommends the 19219 Ground Hub Continuous
Monitor or 98130 AC Outlet Analyzer to check the ground.
Operation
Turn on the power switch and adjust fan speed for the
desired air flow. Higher air flow will result in a faster
neutralization rate.
Aim the unit so that the maximum airflow is directed at the
items or area to be neutralized.
The left rocker switch turns on a heater which will raise the
temperature of the output air to about 10°F above ambient.
The heater is only to offset the chill factor of the moving air.
It is not intended to warm the workstation.
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 section 6.1.3.1 Compliance
Verification Plan Requirement states: “Test equipment shall
be selected to make measurements of appropriate properties
Figure 4. Cleaning the electrodes (method 1)
METHOD 2 (Annually)
To remove heavier accumulations of dirt and dust, use clean,
compressed air. Disconnect power to the ionizer. With
one hand firmly on top of the ionizer, aim com pressed air
through the front grill, directly at the pins. A few passes back
and forth with the nozzle is sufficient.
Figure 5. Cleaning the electrodes (method 2)

DESCO WEST - 3651 Walnut Avenue, Chino, CA 91710 • [phone] • Fax [phone]
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Employee Owned
METHOD 3 (As needed in harsh environments)
This cleaning method will remove all contaminants. Since
this method requires direct contact with emitter electrodes,
it is critical that the ionizer be unplugged before beginning
this cleaning process. Disconnect power to the ionizer.
Dampen the end of a non-linting cotton swab with isopropyl
alcohol. Alcohol is flammable. Extreme caution should
be used when handling any flammable solvent. Reaching
carefully through the grill bars, gently wipe each electrode
until clean. Avoid bending any electrodes. If any electrodes
become dislodged, nudge them with the tail end of the
cleaning brush until they remain no less than 1/4" from any
object. Wait 15 minutes for alcohol to evaporate before
plugging in the ionizer.
THEORY OF OPERATION
The Bench Top Blower Ionizer employs a safe non-nuclear
AC ionization source. AC systems utilize emitter electrodes
that are switched rapidly between positive and negative high
voltage, usually at the power line frequency (50/60 Hz). The
ionizer’s unique Faraday Balance System monitors ion output
and automatically adjusts the unit to reach an equilibrium
at low offset voltage or balanced ion flow. The ionizer is
designed to achieve balance under extreme conditions and is
uniquely able to maintain balance in most any environment.
Ions are emitted in an efficient laminar flow. This reduces
air turbulence and ion recombination, prolongs cleanliness
and increases efficiency. The ionizer’s unique tri-metallic ion
emitter electrodes produce a high ion output for rapid charge
dissipation.
The Bench Top Blower Ionizer is engineered for efficiency
and durability, making this bench top ionizer highly
dependable and cost effective.
Figure 6. Cleaning the electrodes (method 3)
ADJUSTMENT
There are no user adjustable or serviceable parts inside the
ionizer. Adjusting or dismantling your ionizer may create
dangerous conditions and unauthorized modifications will
void the product warranty. Servicing should be performed
only at the factory, or by a technician trained in high voltage
circuits. See warranty section for repair information.
Figure 7. Components of the Faraday Balance System
Balanced
Ion
Flow
Grill
Bars
Electrodes Faraday Cage
Fan
Air Flow
Neutralization Efciency (Decay Time)
The comparative efciency of bench top ionizers is
determined by a standard test published by the ESD As-
sociation (Draft standard S 3.1). The decay rates mea-
sured using this standard for the ionizer are shown in the
following diagram. The performance of the ionizer was
measured with the unit positioned at varying distances
with the fan speed on high.

DESCO WEST - 3651 Walnut Avenue, Chino, CA 91710 • [phone] • Fax [phone]
DESCO EAST - One Colgate Way, Canton, MA 02021-1407 • [phone] • Fax [phone] • Website: Desco.com
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Employee Owned
Neutralization (Discharge) Times
All data was taken with the fan speed set to high with the filter removed. All time measurements are in seconds.
TP1 + >60
- >60
12" 12" 12"
12"
12"
TP4 + >60
- >60
TP7 +28.0
-32.0
TP10 +18.0
-20.0
TP2 +1.2
-1.4
TP5 +1.5
-2.0
TP8 +2.3
-3.0
TP11 +3.1
-4.0
TP3 + >60
- >60
TP6 + >60
- >60
TP9 +20.0
-23.0
TP12 +15.0
-20.0
Bench Top
Blower Ionizer
Air Flow
Charged Plate
12"
Figure 8. Neutralization (Discharge) Times of item 19500 at 120VAC, 60Hz input
TP1 + >60
- >60
12" 12" 12"
12"
12"
TP4 + >60
- >60
TP7 +38.0
-46.0
TP10 +21.0
-28.0
TP2 +1.4
-1.6
TP5 +2.0
-2.5
TP8 +2.9
-3.7
TP11 +3.9
-4.9
TP3 + >60
- >60
TP6 + >60
- >60
TP9 +35.0
-40.0
TP12 +19.0
-25.0
Bench Top
Blower Ionizer
Air Flow
Charged Plate
12"
Figure 9. Neutralization (Discharge) Times of item 19500 at 100VAC, 50Hz input

DESCO WEST - 3651 Walnut Avenue, Chino, CA 91710 • [phone] • Fax [phone]
DESCO EAST - One Colgate Way, Canton, MA 02021-1407 • [phone] • Fax [phone] • Website: Desco.com
TB-2016 Page 5 of 5 © 2012 DESCO INDUSTRIES, INC.
Employee Owned
Specifications
Input:
19500 120 VAC - 50/60 Hz - 3.0 Amps
19520 220 VAC - 50/60 Hz - 1.5 Amps
Fuse Type:
19500 Slow blow 5 amp
19520 Slow blow 3 amp
Output: 4.5kV at 50 - 60 nano amps
Air Flow: Adjustable 117 CFM maximum
Balance Voltage*: ±5V
Dimensions: 11" x 9" x 7"
Weight:
19500 13 Pounds
19520 16 Pounds
Cord:
19500 Cord with three wire IEC plug
(ground required)
19520 Not included
*Desco ionizers meet the ANSI/ESD S20.20 minimum
recommended technical requirement range of less than ±50
Volts voltage offset tested in accordance with ANSI/ESD
STM3.1. Desco models 19500 and 19520 greatly exceed
the requirement providing ±5 Volt auto-balancing.
Limited Warranty
Desco expressly warrants that for a period of one (1) year from the date
of purchase Desco Ionizers will be free of defects in material (parts) and
workmanship (labor). Within the warranty period, a credit for purchase
of replacement Desco Ionizers, or, at Desco’s option, the Ionizer will be
repaired or replaced free of charge. If product credit is issued, the amount
will be calculated by multiplying the unused portion of the expected one
year life times the original unit purchase price. Call our Customer Service
Department at 909-627-8178 (Chino, CA) or 781-821-8370 (Canton, MA)
for a Return Material Authorization (RMA) and proper shipping instructions
and address. Please include a copy of your original packing slip, invoice,
or other proof of date of purchase. Any unit under warranty should be
shipped prepaid to the Desco factory. Warranty replacements will take
approximately two weeks.
If your unit is out of warranty, call our Customer Service Department at
909-627-8178 (Chino, CA) or 781-821-8370 (Canton, MA) for a Return
Material Authorization (RMA) and proper shipping instructions and
address. Desco will quote repair charges necessary to bring your unit up
to factory standards.
Warranty Exclusions
THE FOREGOING EXPRESS WARRANTY IS MADE IN LIEU OF
ALL OTHER PRODUCT WARRANTIES, EXPRESSED AND IMPLIED,
INCLUDING MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE WHICH ARE SPECIFICALLY DISCLAIMED. The express
warranty will not apply 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 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 product for their intended use, and users assume all risk
and liability whatsoever in connection therewith.
TP1 + >60
- >60
12" 12" 12"
12"
12"
TP4 + >60
- >60
TP7 +51.0
-59.0
TP10 +25.0
-38.0
TP2 +1.3
-1.5
TP5 +1.9
-2.5
TP8 +2.8
-3.6
TP11 +3.7
-4.9
TP3 + >60
- >60
TP6 + >60
- >60
TP9 +35.0
-41.0
TP12 +21.0
-26.0
Bench Top
Blower Ionizer
Air Flow
Charged Plate
12"
Figure 10. Neutralization (Discharge) Times of item 19520 at 230VAC, 50Hz input