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EMIT 

- 3651 Walnut Avenue, Chino, CA 91710 • (909) 664-9980 • Website: 

DescoEMIT.com

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

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