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the cord from the operator jack. In the case of removing the
cord from the jack, the audio alarm will only sound for about
eight seconds.
Whenever the coil cord is accidentally withdrawn from the jack,
or if continuity from the user to the satellite remote unit is not
maintained, the alarm sounds, the green Operator LED turns
off and the red Operator LED turns on.
WORK SURFACE CHANNEL
The 19230's Work Surfaces monitoring circuitry is sufficiently
sensitive to detect extremely low current, allowing it to be used
with mats having a resistance of up to 1x 107 ohms (10
megohms). If user desire not to monitor worksurface, mat
circuit can be bypassed with switch, located at the rear of the
satellite.
When the monitor is connected to a static dissipative work
surface, the amount of current that flows is a function of the
total resistance between the monitor and through the work
surface to ground. When the resistance of the work surface is
below a present threshold, the monitor will indicate good.
Conversely, if the resistance level is high when compared to
the monitor's reference, the unit will alarm. This is an
integrating resistance measuring circuit, therefore it is relatively
insensitive to externally induced electromagnetic fields. The
resistance threshold is factory set to 10 megohms (1 x 107
ohms). Custom worksurface range available upon request. Call
for details.
Note: Per ESD S6.1, Grounding paragraph 4.1.1 "Every
element to be grounded at an ESD protected station shall be
connected to the same common point ground." The ESD
control plan should include a tailoring** statement that
continuous monitors are used and that consistent with
manufacturer's design grounding is via AC adapter cord to
equipment ground.
Specifications
Supervisor Jack
Resistance to Ground
47 K ohms typical
Work Surface Limit*
Set to 10 Megohms (1 x 107 ohms)
Operating Voltage
120 VAC, 50-60 Hz
Response time to alarm
< 50 mS
Operating Temperature
0 - 40°C
Long Term Drift
<0.5% per Decade
(1st Decade is 1 hr)
Size (less bracket)
3.25" x 4.75" x 1.1"
Note: Work surface must have a conductive layer such as Dual
Layer Rubber or Dissipative 3-Layer Vinyl or Micastat
Dissipative Laminate with conductive buried layers. Desco
Continuous Monitors are not recommended for use with
homogeneous matting.
DESCO WEST - 3651 Walnut Avenue, Chino, CA 91710 (909) 627-8178 Fax (909) 627-7449
DESCO EAST - One Colgate Way, Canton, MA 02021-1407 (781) 821-8370 Fax (781) 575-0172 Web Site: http://www.Desco.com
Limited Warranty
Desco expressly warrants that for a period of five (5) years from the
date of purchase Desco Continuous Monitors will be free of defects in
material (parts) and workmanship (labor). Within the warranty period,
a credit for purchase of replacement Desco Continuous Monitors, or,
at Desco's option, the Continuous Monitor 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 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
.
Maintenance and Calibration
The Dual Operator Workstation Continuous Monitor is solid
state and designed to be maintenance free. The 19230 and
19231 are calibrated to NIST traceable standards. There are
no user adjustments that can be made. Because of the
impedance sensing nature of the test circuit, special
equipment is required for calibration. We recommend that
calibration be performed annually, using the Desco #98220
Continuous Monitor Calibration Unit. The Calibration Unit is a
most important product which allows the customer to perform
NIST traceable calibration on continuous monitors and can be
used to fulfill ANSI/ESD S20.20 Paragraph 6.2.2.2 Personnel
Grounding Guidance, "Personnel should check constant
monitoring devices (when used) to ensure that they are
functional and operating before ESDS products are handled.
In addition, constant monitoring devices should be functionally
checked periodically to ensure that they are operating as
designed." The #98220 is designed to be used on the shop
floor at the workstation, virtually eliminating downtime,
verifying that the continuous monitor is operating within
tolerances.
*Limits can be varied and set to 1 gigohm maximum.
2009 DESCO INDUSTRIES INC.
Employee Owned