Desco EMIT 50552 Installation guide

TB-6519 12/06 Page 1 of 3
Portable Ionization Test Kit
Operation and Maintenance
DESCO EMIT WEST - 3651 WalnutAvenue, Chino, CA 91710 • [phone] • Fax [phone]
DESCO EMIT EAST - 90 Hudson Road, Canton, MA 02021-1407 • [phone] • Fax [phone] • Web Site: DescoEMIT.com
above components along with the model 50551 fieldmeter. The
50551 digital fieldmeter is sold separately.
Inspection
Remove the kit from the carton and inspect for damage. Each
kit includes:
1 50551 Digital Field Meter
1 Isolated Plate Assembly
1 ±1000 Volt Charger
1 9 Volt alkaline battery (installed)
1 Carrying case
Taking Balance Measurements
The Portable Ionization Test Kit has been designed to match
the compact size and hand held convenience of the 50551
Digital Field Meter. Use the following procedure to verify the
balance of air ionization equipment. This quick and easy
procedure will help determine if the piece of ionization
equipment is working within the manufacturer's specifications
or user requirements. It is extremely important that ionizers
be checked regularly for balance. An ionizer operating in
an out-of-balance state can damage sensitive electronic
componets or assemblies.
Figure 2. Installing the isolated plate assembly on the 50551
Digital Fieldmeter
Figure 1. 50551 Digital Fieldmeter and 50552 Portable
Ionization Test Kit
Description
The Desco EMIT Portable Ionization Test Kit allows the 50551
Digital Fieldmeter to be used to monitor the balance of
ionization equipment. The test kit also includes a Charger used
to place a 1000V charge on the isolated adapter plate
assembly, making it possible to also measure the neutralization
performance of air ionization equipment. The 50552 Test Kit
was designed to be used in conjunction with the 50551 Digital
Fieldmeter, providing a highly portable and cost effective
means of verifying the performance of a wide variety of
ionization equipment.
NOTE: The 50551 Digital Fieldmeter is designed to operate
only with the 50552 Portable Ionization Test Kit. It is not
compatible with other brands.
Currently there are no established standards describing a
periodic verification device or procedure for air ionizers. The
Desco EMIT Portable Ionization Test Kit has been designed to
make measurements that correspond to those made by using
a charged plate analyzer and ESD Association's Standard 3.1.
While the Ionization Test Kit provides convenience and
portability, it does not meet all of the requirements of the ESD
Association Standard. We recommend our Charged Plate
Analyzer if precise measurements are required.
The Portable Ionization Test Kit includes a slide-on isolated
plate assembly, a ±1000 volt charging unit and a durable
thermoplastic carrying case with custom cut-outs for all of the
TECHNICAL BULLETIN TB-6519
© 2006 DESCO INDUSTRIES INC.
Employee Owned
Made in America

TB-6519 Page 2 of 3
DESCO EMIT WEST - 3651 WalnutAvenue, Chino, CA 91710 • [phone] • Fax [phone]
DESCO EMIT EAST - 90 Hudson Road, Canton, MA 02021-1407 • [phone] • Fax [phone] • Web Site: DescoEMIT.com
1. INSTALLING THE ISOLATED PLATE ASSEMBLY - The
case of the Model 50551 Fieldmeter has two slots along its
slides. The top slot is closest to the front of the instrument.
Slide the tabs of the adapter Plate ground plate into the top
slot of the meter case as far as they go.
Figure 3. Zeroing the Fieldmeter
2. ZERO THE INSTRUMENT - Make connection between the
Adapter Plate and the meter case either through your finger or
a test lead. Face the Fieldmeter away from charged objects
and press the ON/ZERO button. Hold until the display reads
zero. The instrument may also be zeroed by pointing it toward
a known grounded surface (such as the palm of the opposite
hand) and depressing the ON/ZERO button. Although you
must be careful not to contact the recessed sensor plate, the
amount of spacing between the instrument and the target is
not critical when zeroing the instrument. NOTE: The 50551
has a conductive case that provides a ground reference for the
measuring circuit. For accurate measurements it is necessary
that the person holding the meter be properly grounded.
Figure 4. Taking a balance measurement.
3. TAKE A MEASUREMENT - Locate the meter in an ionized
environment at the appropriate distance from the device under
test. The static field displayed is the actual balance of the
ionizer or voltage offset. NOTE: When testing pulsed ionizer
systems, the voltage displayed is constantly changing. This
pulse rate may be faster than the display update rate of the
fieldmeter, therefore the displayed voltage is an average of the
actual voltage. The output of the fieldmeter is useful in this
situation for more accurate measurements.
Taking Discharge Measurements
In order to verify that an ionizer is operating properly it is also
important that its ability to neutralize or discharge static
electricity is measured. The following procedure will measure
an ionizer's discharge time.
1. OPERATING THE CHARGING UNIT - The Model 50552
has a momentary push-button that turns on the power to the
unit. Holding the button down supplies power to the output
terminals.
2. OUTPUT CONTACTS - Two output contacts are provided.
They are connected to an internal power source. When one
contact is connected to ground the other contact will provide a
charge of the indicated polarity. The charger is designed so
that an operator can press the power button and touch an
output contact, simultaneously with the fingers of the same
hand.
Figure 5. Charging unit controls.
3. POLARITY SELECTION - The terminals are labeled (+) and
(-). To provide a POSITIVE voltage output, connect the
negative (-) terminal to ground. Press and hold the power
switch. To provide a NEGATIVE voltage output, connect the
positive (+) terminal to ground. Press and hold the power
switch.
4. GROUNDING - IMPORTANT! For the charging unit to work
correctly, the operator or the fieldmeter must be properly
grounded. A ground path between an output contact must
exist.
5. IONIZER DISCHARGE TIME MEASUREMENTS - Locate
the 50551 and the Adapter Plate in the appropriate location for
measurements.
6. POSITIVE DISCHARGE MEASUREMENT - For positive
discharge measurement, touch the negative
(-) terminal of the charger while pressing the charging button
BENCHTOP IONIZER
OVERHEAD IONIZER
© 2006 DESCO INDUSTRIES INC.
Employee Owned

TB-6519 Page 3 of 3
DESCO EMIT WEST - 3651 WalnutAvenue, Chino, CA 91710 • [phone] • Fax [phone]
DESCO EMIT EAST - 90 Hudson Road, Canton, MA 02021-1407 • [phone] • Fax [phone] • Web Site: DescoEMIT.com
on the charger. Momentarily touch the positive terminal to the
adapter plate. The 50551reads approximately +1.10kV. By
using a stop watch or other timing device, determine the time
needed for the voltages to decrease from +1.10kV to +.01kV.
This is the positive discharge time.
7. NEGATIVE DISCHARGE MEASUREMENTS - For negative
discharge measurements, touch the (+) output terminal while
pressing the charging button on the charger. Momentarily touch
the negative terminal to the adapter plate. Follow the
instructions for the positive discharge measurement above.
IMPORTANT: A ground path must be provided between one of
the output terminals of the charging unit and the ground
reference of the Fieldmeter and Adapter Plate. This is normally
provided by holding the Charger in one hand and the
Fieldmeter with Adapter Plate in the other. If this is not
possible, you must use a test lead to connect one to the
charger output terminals and the fieldmeter ground connection.
Figure 6. Taking decay measurements.
Calibration
The overall accuracy of the 50552 Test Kit and the 50551
digital fieldmeter is +/- 5% nominal. Calibration of the meter
and the Ionization Test Kit should only be performed by the
factory. Both the 50552 and the 50551 are calibrated to NIST
traceable standards. Contact our Customer Service
Department for details.
Maintenance
BATTERY CARE
The battery in the Model 50552 and 50551 should be replaced
annually and whenever you plan an extended period of
unattended monitoring. See specifications for battery
replacement type.
CLEANING
It is important to keep the insulators on the adapter plate clean
and free of contaminates that may cause surface leakage. To
test the performance of the adapter plate, charge the plate and
note the discharge rate in a non-ionized area. The self
discharge rate to 10% of original voltage should not be less
than five minutes.
The area around the aperture of the Model 50551 must be
kept clean to ensure accurate, drift-free readings. Never touch
the aperture with anything. To remove dust or other particulate
matter, use low-pressure instrument-grade air. To remove more
severe contamination, spray or flush with the smallest practical
amount of clean technical-grade of isopropyl alcohol. Then
allow the instrument to air dry for several hours.
Specifications
Isolated Plate Assembly
Plate Capacitance: 13 picofards ± 2 picofards
Range: 0 to ± 2kV, higher voltages may
be measured
Grounding: Connection through conductive
case of Model 50551
Field meter
Weight: 1.5 oz.
Charging Unit
Output: 1100VDC monimal, <1:A Max.
Output Terminals: Two acorn buttons labeled for
"+" and "-"
Load Regulation: Better than 8% NL to FL where
FL = 109ohms
Battery Type: 9 volt alkaline
Battery Life: 40 hours
Temperature Range: +10° to +30°C (+50° to +86°F)
Relative Humidity: 10% to 80% non-condensing
Dimensions: 3.75"L x 2.88"W x 1"D
(9.53 x 7.32 x 2.54cm)
Weight: 2.8 oz. (79 gm)
Limited Warranty
Desco EMIT expressly warrants that for a period of five (5) years from the date of
purchase, Desco EMIT Ionization Test Kits will be free of defects in material (parts)
and workmanship (labor). Within the warranty period, a credit for purchase of
replacement Desco EMIT products, or, at Desco EMIT's option, the product 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 five 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 EMIT 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 01892 665313 (Crowborough, U.K.) for a Return Material
Authorization (RMA) and proper shipping instructions and address. Desco EMIT
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 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 product
for their intended use, and users assume all risk and liability whatsoever in
connection therewith.
© 2006 DESCO INDUSTRIES INC.
Employee Owned