DESCO WEST
- 3651 Walnut Avenue, Chino, CA 91710 • (909) 627-8178
DESCO EAST
- One Colgate Way, Canton, MA 02021-1407 • (781) 821-8370 • Website:
Desco.com
TB-3083
Page 1 of 5
© 2020 DESCO INDUSTRIES INC
Employee Owned
December 2020
Dual-Wire Dual Operator Monitor
Installation, Operation and Maintenance
Description
The Desco
19662
Dual-Wire Dual Operator Monitor
monitors two operators and two ESD worksurfaces
eliminating the need for periodic testing and
record keeping of wrist straps. The Dual-Wire Dual
Operator Monitor uses low-voltage steady state DC
continuous-loop technology to continuously monitor
(versus pulsed or intermittent) dual-wire wrist strap
functionality. Independent audio and visual alarm
conditions identify the status of the worksurfaces and
operators. Two operator remotes with 10 foot cables are
included for use at adjacent workstations. Each monitor
is calibrated with accepted procedures and standards
traceable to the National Institute of Standards and
Technology (NIST) and includes a NIST certificate.
Dual Wire Monitor Technology
Desco dual wire dual operator monitors uses a loop
electrical resistance technology. A +5 or +8 volt test
signal1 is generated by the monitor and placed on one
conductor of the dual wire wrist strap. The test voltage
is bridged to the opposite conductor through the skin of
the wearer of the wristband and returned to the monitor.
Resistance is monitored with a stable continuous signal
through one conductor, across the skin of the operator,
and returning to the monitor through the opposite
conductor. Desco dual wire dual operator monitors
determine that the operator’s path-to-ground is between
the 10 or 35 megohms2 upper limit (adjustable) and 1
megohm1 lower limit.
1. See Operator Test Voltage section below for pass/
fail specs. User should determine if these voltages
can damage the device being handled. Other
lower voltage monitoring systems may need to be
considered.
2. See Operator Test Range section below for pass/fail
specs.
Figure 1. Desco 19662 Dual-Wire Dual Operator Monitor
TECHNICAL BULLETIN TB-3083
Made in the
United States of America
ANSI/ESD S20.20 section 7.3 states “Compliance
verification records shall be established and maintained
to provide evidence of conformity to the technical
requirements.” Per ANSI/ESD S1.1 Annex A.3 Daily
(wrist strap system) testing may be omitted if constant
monitoring used.” Per ESD Handbook ESD TR 20.20
section 5.3.2.4.4 “Typical Test programs recommend
that wrist straps that are used daily should be tested
daily. However, if the products that are being produced
are of such value that knowledge of a continuous,
reliable ground is needed, and then continuous
monitoring should be considered or even required.”
The Dual-Wire Dual Operator Monitor and its
accessories are available in the following item numbers:
Item
Description
19662
Dual-Wire Dual Operator Monitor
19663
Mounting Brackets
50524
Limit Comparator
50525
Replacement Operator Remote Kit, Black
50526
Replacement Operator Remote Kit, White
19262
Replacement Power Adapter, 12 VDC
Packaging
19662
Dual-Wire Dual Operator Monitor
1 Dual-Wire Dual Operator Monitor
1 Power Adapter, 12VDC, with interchangeable plugs
(North America, UK/Asia, Europe)
2 Operator Remotes with Attached Cables
(1 Black, 1 White)
2 White Mat Monitor Cords
1 Monitor Ground Cord
1 Certificate of Calibration
19663
Mounting Brackets
2 Mounting Brackets
4 Pan Head Screws, 8-32 x 1/8"
