Omega Products HHF5000 Installation Manual

Digital Anemometer HHF5000

Operating Instructions

Pressing this key once switches the instrument from OFF to ON or vice
versa. When switched on the HHF5000 will display for one second the

type of probe which is connected, i.e. 275 for the 2.75" (70mm) type or
100 for the 1" (25mm) size. If no probe is connected the instrument defaults to 275.
The values stored in the MAX and MIN memories are cleared each time the instrument
is switched off.

The MPS key converts the airspeed reading shown on the display to
metres per second, the FPM key converts the reading to feet per
minute. The measurement unit selected is shown by either MPS or
FPM on the right hand side of the display.

The 2S and 16S keys are used to select the period of time over
which the airspeed is measured, the default time period is two
seconds. Pressing the 2S key at any time starts a new two second

measurement cycle. The display will read 2S during that time, the
reading will then be displayed and subsequently updated every two seconds. The 16S
key sets the HHF5000 to measure the average airspeed over a sixteen second period.
A new sixteen second measurement is started each time the key is pressed. During
that time interval the display will show 16S and the MPS, FPM, MIN and MAX keys will
be disabled. At the end of the sixteen second period the averaged display reading will
be updated every two seconds. The 16S mode may be cancelled by pressing the 2S
key.

The MIN and MAX keys recall the lowest and highest airspeeds

measured by the HHF5000. Separate maximum and minimum values

are stored for the 2 second and 16 second measurement periods. In

this mode the display will alternate between the name of the
memory location (e.g. L2 for the minimum value measured using the 2 second
measurement period) and the numerical value stored in that location.

The airspeed continues to be measured while maximum or minimum values are being
displayed. Should a new maximum or minimum value be recorded the display will be
updated automatically. To cancel the display of the minimum or maximum values and
return the instrument to standard measurement mode the MIN or MAX key should be
pressed again. The maximum and minimum values are cleared by switching off the
HHF5000.

HHF5000 Specifications

RANGE: 2.75" (70mm) probe: 0.3 to 40 ms-1 (59 to 7875 ft min-1)

1.00" (25mm) probe: 0.3 to 35 ms-1 (59 to 6891 ft min-1)

ACCURACY: 2.75" (70mm) probe: ± 0.25% F.S plus ± 0.75% of reading
(SYSTEM) 1.00" (25mm) probe: ± 0.5% F.S plus ± 1.0% of reading

DISPLAY: 4-digit liquid crystal, 10mm character height

RESOLUTION: 0.01 ms-1 or 1 ft min-1

OPERATING Indicator: 0 to +50°C (32 to 122°F)
TEMPERATURE: Probes: -30 to +80°C (-22 to 176°F)

POWER SOURCE: 2 x 1 .5 volt alkaline LR6 (AA) cells

BATTERY LIFE: 250 hours approximately. Low battery warning after approximately

225 hours.

DIMENSIONS: 181 x 77 x 21.5 mm (indicator)

WEIGHT: 190g approx. with battery (indicator alone)

OTHER Automatic probe 'type identification
FEATURES: Automatic probe characteristic linearization

Switchable 2-second or 16-second measurement period
Maximum and minimum readings stored in memory

Omega Engineering Inc.,
One Omega Drive,
Stamford, CT 06907-0047
Tel: [phone]

www.omega.com

Cleaning

Light deposits on the blades of the vane may be wiped away using a swab moistened
with methylated spirit. This must be done with care so as to avoid disturbing the blade
pitch angle and calibration. In the event of heavy contamination it is
recommended that the probe be returned to the factory for overhaul and
recalibration. The plastic indicator case may be cleaned with a soft cloth moistened
with water and mild detergent - solvents must not be used.

Warranty

The Omega HHF5000 Digital Anemometer is guaranteed to be free of manufacturing
defects for a period of one year from the date of purchase. To obtain service under this
warranty the instrument should be returned in its original packaging to Omega
Engineering. This warranty excludes the batteries and damage due to battery leakage
or misuse of the instrument.

Kit contents

Each digital anemometer kit includes:

Quantity ltem

1 HHF5000 digital indicator
1 HHF5001 2.75" (70mm) or HHF5002 1.0" (25mm) diameter rotating vane

probe
2 Rigid extension rods
1 Rigid extension handle
1 Flexible extension piece
1 1 .5m connecting lead (2.75" probe only) Foam-lined
1 carrying case
2 1.5 volt alkaline LR6 (AA) cells (U.K. market only)
1 Operating instruction leaflet

Directional sensitivity

For accurate airspeed measurement the spindle of the anemometer probe should be
aligned precisely with the direction of the airflow. Both probe types are substantially
bi-directional but for highest accuracy it is recommended that the airflow should be in
the direction of flow used during factory calibration: with the 1" (25mm) probe the
arrow should point in the downstream direction (i.e. with the flow), and the cable
socket of the 2.75" (70mm) type should lie on the upstream side.

Battery replacement

The instrument is powered from 3.0 volts DC
supplied by two alkaline manganese 1.5 volt cells,
type LR6 (AA). These should be replaced when
the battery warning symbol appears on the
display. The low battery warning is given when
the voltage falls to 2.0 volts (1.0 volt per cell), at
which point the battery has approximately 25
hours life remaining. An internal voltage regulator
circuit ensures that the instrument continues to
function until the battery voltage falls to
approximately 1.8 volts. To replace the battery,
the compartment cover at the bottom of the
housing should be slid to the left allowing the
pivoted spring contact to swing clear. The battery
may then be withdrawn, gently shake the
instrument if necessary to loosen the cells. When fitting fresh cells, ensure that each
cell is inserted positive terminal first. Refit the battery compartment cover slide.

Note: Rough handling of the HHF5000 may interrupt the connection to the battery
causing the instrument to switch off. This does not indicate a fault and the instrument
may be reactivated by pressing the ON/OFF key.

Recommendations

DDoo

return the anemometer to its foam-lined carr ying case for storage and
transportation.
DDoo nnoott

touch the vane of the anemometer probe unless for cleaning.

DDoo nnoott

allow any object to strike the rotating vane of the probe.

DDoo nnoott

subject the anemometer probes to physical shock.

DDoo nnoott

allow the anemometer probe bearings to become contaminated.

DDoo nnoott

allow water to collect around the pick-up plate of the probe. Do not strain the
connecting leads.
DDoo nnoott

leave exhausted batteries in the instrument.

Calibration

Calibration of the HHF5000 anemometer is achieved by precise adjustment of the pitch
angle of the balanced vane blades of the anemometer probes. The blades are precisely
set to the correct pitch angle during manufacture and should not be adjusted by the
user. Omega Engineering offers a rapid in-house recalibration service for its airspeed
measurement products, please contact the Sales Office for details