10
1. Press
PWR
to turn the meter
ON
. The display will cycle
through “0” to “00000” and the meter will take up to 10
minutes to warm up due to the HCHO sensor.
2. The meter will count down from “9999” to “8888” and so on
until it reaches “0000.”
3. If there is no HCHO gas present the display
will show “ppm 0.00.” Temperature and RH
readings will alternate on the display.
4. Press
HOLD
to freeze the current reading on
the display. “Hold” will display.
5. Press
HOLD
to resume measurement.
Maximum/Minimum, Time Weighted Average, Short-Term
Exposure Limit
6. Press
MAX/MIN
to enter Maximum/Minimum Mode and
display the maximum reading since the meter was turned
on. “MAX” will display.
7. Press
MAX/MIN
to display the minimum reading since the
meter was turned on. “MIN” will display.
8. Press
MAX/MIN
to display the TWA for the last 8 hours, or
since the meter was turned on. “TWA” will display.
9. Press
MAX/MIN
to display the STEL for the last 15 minutes.
“STEL” will display.
10. Press MAX/MIN to display the 1-hour weighted average.
“1Hr” will display.
11. Press MAX/MIN to return to Normal Mode.
2015.06V1
3
emitted.
4.
Keep
away
from
alcohol
places
while
detecting
HCHO
concentration.
FACTORY
DEFAULT
SETTING
ReFactSet:
Recover
to
factory
setting
Function
Default
Power
Off
Reinstall
Battery
Temperature
unit
℃
Saved
unit
(
℃
or
℉
)
ReFactSet
Auto
Power
off
YES
ReFactSet
HCHO
Alarm
ON
ReFactSet
HCHO
Alarm
Value
0.08
ppm
Saved
Value
MAX/MIN/TWA/STEL
/1hr
Readings
Calculated
Since
power
ON
POWER:
Short
press
PWR
button
to
turn
on
the
meter
and
long
press
PWR
button
to
turn
off
the
meter.
There
are
two
ways
to
provide
power:
(a)
AAA
batteries
x
4pcs,
or
(b)
AC/DC
adaptor.
(a)
Battery
icon
shows
up
when
power
is
weak,
user
should
replace
with
new
batteries
immediately
as
the
readings
on
LCD
are
also
incorrect
due
to
weak
power.
(a)
For
short
time
measurement,
you
may
power
on
by
batteries.
For
logger
user
or
long
time
using,
you
must
connect
with
an
AC/DC
adaptor
for
long
time
use.
MEASUREMENT:
In
normal
measurement
mode,
turn
on
the
meter,
it
takes
couple
minutes
to
warm
up
due
to
HCHO
sensor’s
characteristic,
display
shows
ooooo,
after
warming
up
the
meter,
HCHO
shows
0.00ppm
if
the
environment
is
no
HCHO
gas
existed,
Temperature
and
Humidity
readings
show
interchangeably
on
second
layer
of
screen.
If
batteries
were
installed
for
couple
minute,
power
on
the
meter,
countdown
is
activating
immediately.
AUTO
POWER
OFF:
Meter
will
turn
off
automatically
in
15
minutes
when
no
use,
to
disable
auto
power
off
function
by
pressing
HOLD
and
PWR
buttons
when
power
is
off
,
“
n
”
shows
on
screen,
then
returns
to
normal
measurement.
Meter
defaults
auto
power
off.
For
long
time
logging,
please
remember
to
disable
auto
power
off
function.
MAX/MIN/TWA
8hr
/STEL
15min
/1Hr:
Press
MAX/MIN
button
to
review
maximum
or
minimum
or
TWA
(Time
Weighted
Average
in
8
hours),
STEL
(Short
‐
Term
Exposure
Limit
in
15
minutes)
and
1Hr
weight
average
readings
since
powered
on.
2015.06V1
4
During
this
mode,
long
press
HOLD
button
to
clear
all
maximum,
minimum
values,
now
all
parameters
show
current
reading,
now
“
CLr
”
shows
at
the
bottom
of
LCD
in
2
seconds,
then
automatically
return
to
normal
measurement
mode,
meter
restarts
to
memory
maximum
or
minimum
reading
since
last
clear
action
is
done.
Once
concentration
of
HCHO
exceeds
current
max
values,
readings
will
be
updated.
CHANGE
TEMPERATURE
OR
HCHO
UNIT:
Short
press
Unit
button
to
change
℃
or
℉
of
ambient
temperature.
Long
press
Unit
button
to
toggle
the
HCHO
unit
(ppm
or
mg/m
3
),
when
in
mg/m
3
mode,
the
icon
“ppm”
on
the
LCD
will
disappear.
SET
ALARM
AND
BEEPER:
The
meter
default
0.08ppm
as
HCHO
alarm
threshold
for
different
application,
long
press
SET
button
to
enter
alarm
threshold
setting,
press
HOLD
button
to
increase
value
,
press
BKLT
to
decrease
value
,
press
MODE
button
to
move
to
left
digit
,
press
MAX/MIN
button
to
move
to
right
digit.
Long
press
SET
button
to
save
the
changes,
screen
shows
“
SAVE
”
and
back
to
normal
measurement.
While
setting
alarm,”
SET
”
shows
on
bottom
of
screen.
After
set
up
the
alarm
threshold,
bell
icon
will
show
on
the
top
corner.
Once
the
reading
exceeds
the
threshold
value,
beep
sound
is
alarmed;
short
press
PWR
button
to
turn
off
beeper,
bell
icon
will
disappear
on
the
screen.
Short
press
PWR
again
to
activate
alarm
function.
HOLD:
Press
the
button
to
freeze
current
readings
on
screen
during
normal
measurement
mode.
Under
HOLD
function,
MAX.MIN
display
is
temporarily
void,
The
button
is
also
used
to
increase
the
value
while
setting
up
alarm
threshold.
HCHO
Unit
Selection
Temperature
Unit
Selection
