CL500-en-GB_V1.2 8/15
2
Introduction
Congratulations
on
your
purchase
of
the
CL500
chlorine
tester.
The
CL500
is
a
revolutionary
first
of
its
kind
measurement
device
that
measures
free
and
total
Chlorine
from
0.00
to
3.50
ppm.
The
electrode
method
employed
is
approved
by
the
U.S.
Environmental
Protection
Agency
(EPA)
as
an
acceptable
method
for
wastewater
compliance
monitoring
of
total
chlorine.
For
this
type
of
electrode
method,
a
reagent
tablet
must
be
added
to
the
measurement
solution
before
testing.
The
advantages
of
the
CL500
for
the
user
include:
easy
to
use
and
maintain,
high
accuracy,
self
‐
calibration,
and
fast
response.
This
meter
is
shipped
fully
tested
and
calibrated
and,
with
proper
use,
will
provide
years
of
reliable
service.
Please
visit
our
website
(www.extech.com)
to
check
for
the
latest
version
of
this
User
Guide,
Product
Updates,
and
Customer
Support.
Applications
The
CL500
can
be
used
wherever
a
measurement
of
the
total
chlorine
in
water
as
needed.
This
is
also
referred
to
as
total
residual
chlorine.
It
measures
the
total
of
all
chlorine
present
in
all
forms,
including
dissolved
free
chlorine,
chloramines,
hypochlorous
acid,
and
hypochlorite
ion.
Typical
applications
include
Total
Chlorine
measurements
of
discharge
water
from
water
treatment
plants,
public
drinking
water
supplies
and
cooling
towers,
and
free
chlorine
measurements
of
the
disinfectant
properties
in
swimming
pools
and
cooling
water
applications.
Meter
Description
CL500
Front
Panel
Description
1.
Test
Bottle
Chamber
2.
Test
Bottle
Chamber
latch
3.
LCD
display
4.
POWER
button
5.
HOLD
button
6.
REC
‐
MAX
‐
MIN
button
7.
ZERO
button
8.
TEST
‐
CAL
button
9.
Test
bottle
www.
.com
1.800.561.8187