APO
HOLD MAX MIN AVG
ENTER
mmH O mmHg psi inH O inHg
hPa mbar Pa
Density (kg/m ) (ib/ft )
2
2
3
3
INTRODUCTION
This instrument is design to measure the differ-
ence between the pressures applied on the two ports
of the meter. With a Pitot tube (separate purchasing)
the meter also measures air speed.
Besides displaying result of current measurement,
and hold function the meter also store max / min /
max-min / avg values.
SAFETY INFORMATION
Only operate the measuring instrument properly,
for its intended purpose and within the units speci-
fied in the technical data. Do not use force.
Never store the product together with solvents,
acids or other aggressive substances.
Only carry out the maintenance and repair work
that is described in the documentation. Follow the
prescribed steps when doing so.
SPECIFICATIONS
Unit
Range
Resolution
mmH
2
O
0 to 1019.7
0.1
mmHg
0 to 75.00
0.01
psi
0 to 1.450
0.001
inH
2
O
0 to 40.14
0.01
inHg
0 to 2.953
0.001
hPa
0 to 100.00
0.01
mbar
0 to 100.00
0.01
Pa
0 to 10000
1
fpm
*
1
m/s
*
0.1
Accuracy:
Nominal temperature 22°C, ±1dgt)
±0.03 hPa(0 to 0.30 hPa),
±0.05 hPa(0.31 to 1.00 hPa),
±(0.1 hPa+1.5% of reading) (rest of range)
±0.3 mmH
2
O(0 to 3.0 mmH
2
O),
±0.5 mmH
2
O(3.1 to 10.2 mmH
2
O),
±(1.02 mmH
2
O + 1.5% of reading) (rest of range)
Measurement rate:
2 times/second.
Auto power off:
10 minutes.
Low battery indication:
The “
” is displayed
when the battery voltage drops below the operat-
ing level.
Operating Environment:
0°C to 50°C (32°F to
122°F) at < 70% R.H.
Storage Temperature:
-20°C to 60°C (-4°F to
140°F), 0 to 80% R.H. with battery removed from
meter.
Battery:
1.5Vx2pcs AAA size.
Battery Life:
85 hours typical.
Dimensions:
24.7mm(T) x 50.9mm(W) x 132.9
mm(H).
Weight:
Approx. 113g. (Including batteries)
OPERATIONS
There are 3 operation modes, namely Measure-
ment Mode, Set Mode and Hold Mode.
1. Turning on and off the meter:
When power is off, a short push on “ ” key turns
on the meter and enter Measurement Mode.
When power is on press and hold “ ” key for 2
seconds turns the power off.
Right after power on, all the indicators on the
LCD display lights up for one second.
2. Measurement Mode:
Before start measuring, disconnect the meter from
pressure sources, press “▲” key to zero the meter.
(When there is a measurement > 10hpa, Zeroing
function is disabled).
Connect the meter to the pressure sources, the
meter start measuring and refresh every 0.5 sec-
onds.
Backlight:
In measurement mode, a short push on “ ” key
turns on the backlight for dark environment, it
goes off automatically after 15 seconds if without
further operation.
3. Set Mode:
In set mode, user can select Unit , Density of Me-
dium and turn on/off APO function.(APO = Auto
Power Off, when APO is ON, the meter power off
automatically if no operation in 10 minutes.)
When power is off, press and hold “ ” key for 2
seconds to enter Set Mode.
3.1 Unit setting: Press “▲” key to change unit
(press and hold “▲” key, to scroll units),
press “MODE” to selection the unit and enter
next setting. If unit of air speed (fpm or m/s)
is selected, then next setting is density setting
otherwise APO setting.
3.2 Density of the medium setting: Press “▲” key
to change value (press and hold “▲” key to
scroll values), press “MODE” key to select
and enter APO On/Off setting (Max. Density:
0.624lb/ft
3
or 9.999kg/m
3
)
3.3 APO ON/OFF: short push on “▲” key
switches
between ON and OFF. Push “MODE” key to
select, exit Set Mode and Enter Measurement
Mode.
(Please refer to the section of Measurement
Mode.)
※
Note:
To turn off power in Set Mode abandon the
current setting and previous settings remain un-
changed. If “
” indicator appeared, the setting
value can works till power off but did not save to
meter.
4. Hold Mode:
In Measurement Mode, short push “Mode” key to
enter Hold Mode with indicator “HOLD” shows
at upper left corner of LCD.
Right after entering this mode, shown in the LCD
is the last measurement and the reading will not
be updated with new measurement.
Push “Mode” key each time the display changes
in following sequence:
4.1 Last Measurement: with indicator “HOLD”.
4.2 Maximum value recorded: with indicator
“HOLD” + “MAX”.
4.3 Minimum value recorded: with indicator
“HOLD” + “MIN”.
4.4 Maximum-Minimum value recorded: with in-
dicator “HOLD” + “MAX-MIN”.
4.5 Average of values recorded: with indicator
“HOLD” + “AVG”. (only for wind speed)
4.6 Exit the Hold Mode and return to Measure-
ment Mode.
To clear the recorded values:
In Hold Mode and during viewing MAX, MIN,
MAX-MIN or AVG, press and hold “Mode” key
for 2 seconds, to clear the recorded data and re-
turn to measurement mode.
Installing and Replacing Battery
A. Battery Cover
B. Battery
1. Power is supplied by 2pcs 1.5V (AAA SIZE).
2. The “
” appears in the display when battery
replacement is needed.
3. Push the Battery Cover and lift it in the direction
as shown in the figure.
4. Remove the batteries from battery compartment.
5. Replace with 2 new AAA batteries with polarity
as indicated on the bottom of Battery Compart-
ment.
6. Replace the Battery Cover.
※
Note:
When not use for long time remove battery
and don’t keep in place with high Temp, or
high humidity.
Cleaning
Periodically wipe the case with a damp cloth and
detergent, do not use abrasives or solvents.
HHC280
Differential Manometer
INSTRUCTION
SHEET
M5515/1015
Shop online at omega.com
SM
e-mail: [email protected]
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DIFFERENTIAL MANOMETER
HHC280
