EMIT
- 3651 Walnut Avenue, Chino, CA 91710 • (909) 664-9980 • Website:
TB-6557
Page 1 of 4
© 2011 DESCO INDUSTRIES, INC.
Employee Owned
Multi-Ground Continuous Monitor
Installation, Operation and Maintenance
November 2011
TECHNICAL BULLETIN TB-6557
Description
The EMIT Multi-Ground Continuous Monitor is a continuous
monitor designed to verify that a worksurface, shelving, or
equipment is connected to ground which depending upon
the value of a company’s ESD sensitive items should be a
continuous task. The Multi-Ground Continuous Monitor can
individually monitor eight ESD protective elements. If there
is an interruption in the connection to ground, the Multi-
Ground Continuous Monitor will provide both a visual and
audible alarm. ESD protective elements are to be
periodically checked, but a failure between checks may
expose ESD sensitive products to damage from
electrostatic discharge. The entire amount of products
produced after passing a periodic check and the failure
being detected could be suspect.
Per ESD Handbook TR20.20 section 5.3.9.3.1 Worksurface
Ground Monitoring “Some continuous monitors can monitor
worksurface ground connections. A test signal is passed
through the worksurface and ground connections.
Discontinuity or over limit resistance changes cause the
monitor to alarm. Worksurface monitors test the electrical
connection between the monitor, the worksurface, and the
ground point. The monitor however, will not detect
insulative contamination on the worksurface and alternative
test methods such as those outlined in ESD S 4.1 can be
used to isolate this problem.”
Per ESD TR 12-01 Section 3.2 Equipment “Wrist strap
monitor may also monitor equipment ground connections in
a manner similar to worksurfaces.”
Packaging
1 Multi-Ground Continuous Monitor
1 Interchangeable Plug Power Supply
1 Multi-Ground Hub Kit
1 Right Angle Ground Wire, 12' Long
1 Ground Wire with Ring Terminal, 10' Long
2 Mounting Screws
1 Certificate of Calibration
Figure 1. EMIT 50570 Multi-Ground Continuous Monitor.
Features and Components
STATUS LEDS
A. Ground Status LEDs 1-8:
B. Ground Hub LED:
C. Power LED:
CONNECTIONS
B. Relay Terminals:
Can be used to output to a light
tower or Programmable Logic Controller.
Terminals 1 & 2 = normally open
Terminals 2 & 3 = normally closed
1 A@ 30 VDC (Rating)
Made in the
United States of America
A
B C
Figure 2. Front view LEDs.
B
C
D
E F
Figure 3. Multi-Ground Continuous Monitor
connectections.
LED Color Status
Green Circuit is within set limit
Red Circuit is greater than set limit
Off Desired circuit is set to OFF
LED Color Status
Green Terminal GND-H is less than
1.5 ohms from Ground Reference
Red Terminal GND-H is greater than
2 ohms from Ground Reference
LED Color Status
Green Circuit is within set limit
Red Circuit is greater than set limit
Off Desired circuit is set to OFF
US Patents 6,205,048 & 6,052,053
