Desco 19500 Installation and operating instructions

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).
The bench top ionizer is NIST calibrated and is available in
two models. Both models come equipped with universal IEC
cord connectors.
Model Voltage / Hz IEC Cord
19500 120 / 50-60 Yes
19520 220 / 50-60 No
IONIZER SELECTION
ANSI/ESD S20.20 paragraph 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; and operation and maintenance cost.
The unit is normally mounted at one end of a workbench or
area to be neutralized. It may also be wall mounted or
mounted on a shelf. The ionizer’s decay time (neutralization
efficiency) will be best from approximately 6" to 42" in front
of the unit, and will drop off as the distance from the unit
increases.
Figure 2. Area of optimum charge neutralization.
Installation
Remove the ionizer from the carton and inspect for shipping
damage. Included with the unit should be:
1 power cord, 6' IEC type (120V only)
1 cleaning brush
1 filter and guard assembly
Figure 1. Bench Top Ionizer
Description
This ionizing unit is a self-balancing bench top ionizer. The
ionizer’s patented* Faraday Balance System assures
perfect ion balance automatically. It offers greater efficiency
and easier cleaning than conventional ionizers. The Bench
Top Ionizer is designed to neutralize static electricity from
insulators 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 preventing electrostatic charge
generation, ElectroStatic Discharge, ElectroStatic Attraction,
as well as preventing equipment latch-up and safety related
shock. 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."
Ionization is used to neutralize charges 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. 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
TB-2016 December 2008 Page 1 of 4
Bench Top Ionizer
Installation, Operation, and Maintenance Made in America
*Manufactured under U.S. patent #5,008,594
© 2008 DESCO INDUSTRIES INC.
Employee Owned
TECHNICAL BULLETIN TB-2016
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176 - TestEquipmentDepot.com

TB-2016 Page 2 of 4
Figure 3. Wall or shelf mounting of the ionizer.
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.
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 bench top ionizer must be grounded
for proper operation. We recommend Item #98130 to check
ground point.
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-
2:1paragraph 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 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 (At least every 6 months)
The Bench Top Ionizer comes with an easy-cleaning brush
which should be stored in a convenient location. It is
important to 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 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 compressed air
through the front grill, directly at pins. A few passes back
and forth with the nozzle is sufficient.
Figure 5. Cleaning the electrodes (Method 2).
© 2008 DESCO INDUSTRIES INC.
Employee Owned

TB-2016 Page 3 of 4
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.
Figure 6. Cleaning the electrodes (Method 3).
Neutralization Efficiency (Decay Time)
The comparative efficiency of bench top ionizers is
determined by a standard test published by the ESD
Association (Draft standard S 3.1). The decay rates
measured 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.
Theory of Operation
The Bench Top Ionizer employs a safe non-nuclear AC
ionization source. AC systems utilize emitters 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 perfectly balanced ion flow. The ionizer is
designed to achieve balance under extreme conditions and
is uniquely able to maintain balance in almost 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 Ionizer is engineered for efficiency and
durability. The Faraday Balancing System reduces the need
for annual calibration, making this bench top ionizer highly
dependable and cost effective.
Figure 8. Components of the Faraday Balance System.
Testing and Calibration
Test using a version of EOS/ESD STM3.1. Observe and
record offset voltage (float voltage) in voltage, measure of
discharge time for +1000volts to +100volts and -1000volts
to -100volts in seconds.
Equipment and tools used:
- Charged Plate Monitor (CPM)
- Medium sizes insulative flat head screw driver
Set-up:
1. Refer to EOS/ESD STM3.1, 6.3 Worksurface Ionization. Test
should be performed on static dissipative worksurface. Testing
technician and worksurface needs to be properly grounded.
2. Refer to figure 11 - Test locations for bench top ionizer on page
11. Front of ionizer needs to be 12" away from surface of CPM
plate, for TP2.
Testing:
Lab environment should be at 75°F at +/-5°F, relative humidity at
45% at +/-5% RH. Observe offset voltage for no less than 10sec
before recording.
CHARGE DECAY TIME CONSTANTS
Notes: 1) Decay times are from +1000 volts to <100 volts in
accordance with ANSI EOS/ESD S3.1
2) Data taken using full fan speed
1 ft. Charged Plate
ESD TEST SET UP Static Dissipative Workbench Surface
Figure 7. Decay time in seconds from 1000 volts to 100
volts on a 6" x 6" charged plate per ANSI EOS/ESD S3.1.
© 2008 DESCO INDUSTRIES INC.
Employee Owned

Limited Warranty
Desco expressly warrants that for a period of one (1) year from the
date of purchase, Desco Bench Top Ionizers will be free of defects
in material (parts) and workmanship (labor). Within the warranty
period, a unit will be tested, repaired or replaced at Desco’s option,
free of charge. Call Customer Service at 909-627-8178 (Chino, CA)
or 781-821-8370 (Canton, MA) for Return Material Authorization
(RMA) and proper shipping instructions and address. You should
include a copy of your original packing slip, invoice, or other proof
of purchase date. Any unit under warranty should be shipped
prepaid to the Desco factory. Warranty repairs will take
approximately two weeks.
If your unit is out of warranty, Desco will quote repair charges
necessary to bring your unit to factory standards. Call Customer
Service at 909-627-8178 (Chino, CA) or 781-821-8370 (Canton,
MA) for Return Material Authorization (RMA) and proper shipping
instructions and address. Ship your unit freight prepaid.
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
Electronic ionizers use high voltage corona discharge and should
not be used in or near flammable or explosive environments. 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 deter-
mine the suitability of the product for their intended use, and users
assume all risk and liability whatsoever in connection therewith.
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.
Health
There are no known health risks associated with our
devices. The emitters work at about 4-6 kV and can create
ozone, but there have been no significant measurement of
ozone from our emitter sets, as all our existing units test
well below the OSHA limit of 0.05 ppm ozone. For
additional safety information, see "Dispelling an Old Myth"
written by William Metz of Hewlett-Packard published in
Evaluation Engineering magazine, September
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: 4.5 KV at 50 - 60 nano amps
Airflow: Adjustable 117 CFM maximum
Balance Voltage*: ±5v
Size: 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 EOS/ESD S3.1.
Desco models 19500 and 19520 greatly exceed the requirement
providing ±5 volt auto balancing.
© 2008 DESCO INDUSTRIES INC.
Employee Owned
MFG Specifications Recorded Values
Offset voltage
(floating voltage)
in voltage
+/-10 volts at TP2
(1 foot)
Discharge time,
+1000volts to
+100volts in
seconds
2 sec or less at
TP2 (1 foot)
Discharge time, -
1000volts to
-100volts in
seconds
2 sec or less at
TP2 (1 foot)
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