Vermason 225208 Installation, Operation And Maintenance Manual

SINGLE CONTINUOUS MONITOR FOR
WRIST STRAP AND BENCHMAT
Installation, Operation and Maintenance

UNIT C, 4TH DIMENSION, FOURTH AVENUE, LETCHWORTH, HERTS, SG6 2TD UK

Phone: [phone], Fax: [phone] • e-mail: [e-mail], Internet: Vermason.co.uk

TB-7562 December 2008 Page 1 of 2 © 2008 Vermason

Figure 1. 225208 Single Continuous

Monitor.

Description

The 225208 continuous monitoring
system provides constant monitoring
of personnel and work surface
grounding. It operates using a
current loop and dual wrist strap
system. It uses a low-test voltage
and current which makes it suitable
for use with most ESD sensitive
items. The unit is unaffected by
capacitance variations associated
with personnel and environmental
conditions. It is suitable for use in
some clean rooms. The resistance
thresholds are set to meet the
requirements of EN 61340-5-1 but
they can be altered if required.

Leading companies use continuous
monitors as a cost effective
component in satisfying some of the
audit and check requirements of EN
61340-5-1. Wrist strap testing
“Where continuous monitoring is
used, no additional testing is
required.” (EN 61340-1, per A.5.2)

“The wrist band will normally be worn
for several hours at a time so it
needs to be comfortable while
making good contact with the skin. It
is a good idea to check the wrist
strap every time it is applied.
Constant on line monitors can be
used to that any breaks will be
immediately found.” (EN 61340-5-2
section 5.2.7)

Inspection

Remove the test unit from the carton
and inspect for shipping damages.

Each 225208 unit should include the
following:

1 Single Continuous monitoring

unit, item #225207
1 Dual fabric wrist band
1 Dual cord for dual wrist band
1 Remote connecting box (with a

monitored socket and guest

connection) complete with

mounting screws
2 mat grounding cords, 2.5m

long, 10 mm socket / 4mm

banana plug
1 monitor grounding cord,

2.5m long, 4mm plug/ring

terminal
1 Power supply UK
1 Screws, adhesive hook and loop

straps for mounting monitor

1 Washers, studs, screws for

connecting to bench top

Installation

1. Determine the mounting location of

the monitor (225207) and remote

boxes (225204). The monitor can

easily be mounted on top of the

work surface or underneath a shelf

using double-sided adhesive hook

and loop straps, or the supplied

screws. The front panel should be

readily visible to the operators.

The remote box should be

mounted in an easily accessible

position, as the operator has to be

connected to this box.

2. Wire the remote boxes to the

monitor by connecting the stereo

jack plug to the jack socket

mounted on the back panel of the

monitor. This cord provides a path

to ground for the monitored wrist

strap socket and the guest socket,

as well as the monitoring signal.

The picture on the right shows

how to connect the remote boxes

to the back panel of the

instrument.

3. Mount two 10 mm press-studs on

the work surface about 5 cm

apart. Two types of press-studs

are included with the kit; choose
the most convenient one for your
surface. If using hard laminate
ensure that both press-studs are
making connection with the
conductive layer. It is generally
good to use the supplied rubber
washer to ensure optimum
connection, whatever the type of
surface. Place it under the stud
on the surface.

4. It is possible to connect the mats
in two different ways:

Solution 1: connect one stud to

the earth and the other to the
monitor.

Note: The earth loop is monitored
with this method of wiring, if the
earth cord is disconnected, the
instrument will alarm

Figure 2. 225208 Wiring Solution 1.

Solution 2: Connect both
studs on the mat to the
monitor using two 230385
cords.

Note: The earth loop is not
monitored with this method of
wiring. If the earth cord is
disconnected, the instrument will
not alarm. However, the two mat
testing circuits are fully
independent.
Use only this wiring solution if the
bench top resistance is very high
and the standard connection
method does not provide
satisfactory results. With this
method, the earth cord must be
hard-wired and tested regularly.

TECHNICAL BULLETIN TB-7562

Made in Britain

Solution 2 ensures correct
threshold monitoring of the mat's
resistance. Use Solution 2 only if
Solution 1 does not provide
satisfactory results. However, the
advantage of solution 1 is that the
mat and the instrument ground
connections are monitored which
is more meaningful than the mat
resistance.

5. Connect the system to earth
facility using a cord inserted into
the 4mm plug socket

6. Plug the DC power supply plug
(224700) into the power jack in the
rear of the unit. Route the wire
from the supply to a nearby mains
socket and plug the power supply
into the socket.

Unit Operation

Install the operator wristband and
ground cord (225200 and 225202).
The right-angled plug inserts into the
socket on the yellow remote box. The
wrist strap is monitored as soon as
the cord is connected to the remote
box socket.

Note: The remote box is fitted with
three sockets, a jack stereo socket
and two 4mm plug socket. The latter
are for guest use, and are not
monitored.

The front panel

The LED located in the centre of the
unit indicates the status of the
workstation. On the far right of the
unit is an orange LED indicating that
the unit is powered.
The workstation status is indicated
via 4 LED and a buzzer. The buzzer
and the two red LED labeled "Low"
and "High" indicate if the wrist strap
resistance, when worn, is lower than

0.75MΩ or higher than 35MΩ .

These LED should not come on
when the resistance of the wrist strap
is within these limits. Assuming
Solution 1 has been chosen, the LED
labeled "Mat" will turn red when the
resistance to ground of the work
surface is higher than 100MΩ .

Limited Warranty

Vermason expressly warrants that for a period
of one (1) year from the date of purchase,
Vermason

Single Continuous Monitor For Wrist

Strap and Benchmats

will be free of defects in
material (parts) and workmanship (labour).
Within the warranty period, a unit will be
tested, repaired or replaced at Vermason’s
option, free of charge. Call Customer Service
at

0044 (0) 1462 672005

for a Return Material
Authorisation (RMA) and for proper shipping
instructions and address. Any unit under
warranty should be shipped prepaid to the
Vermason factory. You should include a copy
of your original packing slip, invoice, or other
proof of purchase date. Warranty repairs will
take approximately two weeks.

If your unit is out of warranty, Vermason will
quote repair charges necessary to bring your
unit to factory standards. Call Customer
Service at

0044 (0) 1462 672005

for a Return
Material Authorisation (RMA) and proper
shipping instructions and address.

Warranty Exclusions

THE FOREGOING EXPRESS WARRANTY IS
MADE IN LIEU OF ALL OTHER PRODUCT
WARRANTIES, EXPRESSED AND IMPLIED,
INCLUDING MERCHANTABILITYAND
FITNESS FOR APARTICULAR 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 Vermason 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.

Should the mat resistance be below
this limit, and the worn wrist strap
resistance be between 0.75 and
35MΩ limits, the green "OK" LED
should turn on and the buzzer will
remain silent.

Parking a station

When an operator has to leave the
work area, his wrist strap monitor
should be parked by unplugging his
wrist strap ground cord from the
remote box. In this situation the
green "OK" LED will not illuminate
and the buzzer will remain silent.

Certification

Depending upon the requirements of
a facility, periodic verification of the
monitoring unit may be performed
using a calibrated decade box
Vermason product code 223000.
The calibration procedure is
described in the Instructions for Use
of this decade box.

Specifications

Test voltage: Max 5 Volts DC
Test current: Max 5µA
Resistance settings

Lower limit: 0.7-0.8MΩ

adjustable from 0.5
to 2MΩ

Upper limit: 34-36MΩ adjustable

from 25 to 50MΩ

Accuracy, mat test:

± 10% (both mat connectors wired to
the monitor, wiring solution 1).

Calibration, mat test:

90-100MΩ (fully adjustable from 25
to 110MΩ )

Station status indication via 4 LED
+power-on LED

Station parking facility (unplug wrist
strap from remote box)

UNIT C, 4TH DIMENSION, FOURTH AVENUE, LETCHWORTH, HERTS, SG6 2TD UK

Phone: [phone], Fax: [phone] • e-mail: [e-mail], Internet: Vermason.co.uk

TB-7562 Page 2 of 2