Desco 19520 User manual

DESCO WEST - 3651 Walnut Avenue, Chino, CA 91710 • [phone]
DESCO EAST - One Colgate Way, Canton, MA 02021-1407 • [phone] • Website: Desco.com
TB-2016 Page 1 of 6 © 2015 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 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).
October 2015
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 Input Voltage Power Cord
19500 120VAC North America
19520 220VAC Not Included
Packaging
1 Bench Top Blower Ionizer
1 Power Cord, 6' (19500 only)
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.
TECHNICAL BULLETIN TB-2016
Figure 1. Desco Bench Top Blower Ionizer
18"
12"
42"
6"
Figure 2. Area of optimum charge neutralization

DESCO WEST - 3651 Walnut Avenue, Chino, CA 91710 • [phone]
DESCO EAST - One Colgate Way, Canton, MA 02021-1407 • [phone] • Website: Desco.com
TB-2016 Page 2 of 6 © 2015 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.
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 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 (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 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 98132 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.
Figure 4. Cleaning the electrodes using compressed air

DESCO WEST - 3651 Walnut Avenue, Chino, CA 91710 • [phone]
DESCO EAST - One Colgate Way, Canton, MA 02021-1407 • [phone] • Website: Desco.com
TB-2016 Page 3 of 6 © 2015 DESCO INDUSTRIES, INC.
Employee Owned
METHOD 2 (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 5. Cleaning the electrodes using a cotton swab
dampened with isopropyl alcohol
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 6. Components of the Faraday Balance System
Balanced
Ion
Flow
Grill
Bars
Electrodes Faraday Cage
Fan
Air Flow

DESCO WEST - 3651 Walnut Avenue, Chino, CA 91710 • [phone]
DESCO EAST - One Colgate Way, Canton, MA 02021-1407 • [phone] • Website: Desco.com
TB-2016 Page 4 of 6 © 2015 DESCO INDUSTRIES, INC.
Employee Owned
Neutralization (Discharge) Times
All data was taken with the fan speed set to high. All time measurements are in seconds.
NOTE: Discharge times in seconds are representative only and are not a guarantee. Discharge times are actual
measurements recorded in a factory ambient environment.
Per ANSI/ESD S20.20, the test method for Product Qualification test is ANSI/ESD STM3.1, and for Compliance
Verification is ESD TR53 which advises “Measurements should be made at the location where ESD sensitive items
are to be ionized.” A larger area may require additional ionizers. Per S20.20 the required limit for ionizer discharge
time is user defined. Use Table to determine the number of ionizers to achieve ionization of area to be neutralized
to meet your company’s ESD control plan specified discharge times.
The comparative efficiency of bench top ionizers is determined by a standard test published by the ESD
Association: ANSI/ESD STM 3.1. Typical positive and negative decay times (1000V - 100V) measured using this
standard are shown in the figures below. The performance of the ionizer was measured with the unit positioned as
shown, with the fan speed on high and without a filter.
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 7. Neutralization (Discharge) Times of item 19500 at 120VAC, 60Hz input

DESCO WEST - 3651 Walnut Avenue, Chino, CA 91710 • [phone]
DESCO EAST - One Colgate Way, Canton, MA 02021-1407 • [phone] • Website: Desco.com
TB-2016 Page 5 of 6 © 2015 DESCO INDUSTRIES, INC.
Employee Owned
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 9. Neutralization (Discharge) Times of item 19520 at 230VAC, 50Hz 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 8. Neutralization (Discharge) Times of item 19500 at 100VAC, 50Hz input

DESCO WEST - 3651 Walnut Avenue, Chino, CA 91710 • [phone]
DESCO EAST - One Colgate Way, Canton, MA 02021-1407 • [phone] • Website: Desco.com
TB-2016 Page 6 of 6 © 2015 DESCO INDUSTRIES, INC.
Employee Owned
Limited Warranty, Warranty Exclusions, Limit of
Liability and RMA Request Instructions
See the Desco Terms and Conditions -
http://desco.descoindustries.com/TermsAndConditions.aspx
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 outperform the requirement providing ±5 Volt
auto-balancing.

Mouser Electronics
Authorized Distributor
Click to View Pricing, Inventory, Delivery & Lifecycle Information:
Desco:
19500