Omega HHF-312 User guide

User’s Guide

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SM

HHF-312

Mini Anemometer-Psychrometer

With Compass And Memory

omega.com [email protected]

Servicing North America:

U.S.A.: Omega Engineering, Inc., One Omega Drive, P.O. Box 4047

Stamford, CT 06907-0047 USA

Toll-Free: 1-800-826-6342 (USA & Canada only)
Customer Service: 1-800-622-2378 (USA & Canada only)
Engineering Service: 1-800-872-9436 (USA & Canada only)
Tel: [phone] Fax: [phone]
e-mail: [email protected]

For Other Locations Visit omega.com/worldwide

The information contained in this document is believed to be correct, but OMEGA accepts no
liability for any errors it contains, and reserves the right to alter specifications without notice.

MINI ANEMOMETER-

PSYCHROMETER

WITH COMPASS

AND MEMORY

USER’S MANUAL

HHF-312

Please read this manual carefully and thoroughly before using this product.

TABLE OF CONTENTS

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 – 3

Key Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

What’s In the Package . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Product Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 – 5

Setup Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Activate Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Operating Instructions . . . . . . . . . . . . . . . . . . . . . . . 6 – 13

Measuring Air/Wind Speed and Temperatures . . 7 – 9
Displaying Min/Max/Avg Air and Wind Speeds

. . 9 – 10

Measuring Relative Humidity (RH) . . . . . . . . . . . . . 10

Measuring Barometric Pressure . . . . . . . . . . . . . . . 10

Storing and Recalling Records . . . . . . . . . . . . 11 – 12

Using and Calibrating the Compass . . . . . . . . 12 – 13

S

pecifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 – 14

intenance Tips . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Ma

INTRODUCTION

Thank you for purchasing OMEGA’s HHF-312 Mini-Anemometer­Psychrometer with Compass and
manual carefully and thoroughly before using the product.

2

Memory. Please read this user’s

The HHF-312 is a one-piece vane anemometer-psychrometer
that can measure all parameters needed to monitor environmental
conditions indoors or track weather conditions outdoors.

KEY FEATURES

• Measures:
Ambient temperature
Dew Point and Wet Bulb temperatures
Wind Chill Index (WCI)
Air/wind speed and direction
Relative humidity (RH)
Barometric pressure

• Stores/recalls 20 pairs of readings

• All temperatures displayable in °F (default) or °C

• Five available air/wind speed units: ft./min, mph, m/sec, km/hr,

knots

• Min, Max and Avg session values for air/wind speed

• Barometric pressure readings available in kPa or mbar

• Large backlit dual readout LCD

• 5-minute Auto Power Off

• Small and light enough for one-handed operation

• Includes vane and sensor cap with wrist strap

•

Tripod mount

• CE and RoHS approved

• 1 year limited warranty

3

WHAT’S IN THE PACKAGE

The meter comes in a blister pack with a “CR2032” button cell
pre-installed in the battery compartment. A hard copy of this
user’s manual is inside the blister card.

PRODUCT OVERVIEW

Fig. 1 below shows all controls, indicators and physical structures
of the HHF-312, as well as the location of the battery
compartment. Fig. 2 shows all possible indications on the
meter’s LCD.

Fig. 1. The controls,

indicators and
physical structures
of the HHF-312

A

A. Vane and sensor

protection cap
B. Vane
C. Temperature-humidity

sensor
D. LCD
E. Keypad
F. Battery compartment
G. Wrist strap
H. Threaded tripod

nting hole

mou

4

B

C

D

E

G

F

H

A. Air/wind

Q R A

B C D

speed mode

indicator
B. RH mode

indicator
C. Barometric

P

pressure

mode

indicator
D. Air/wind

O
N

M

speed

session

L

value

indicators

K J

I

E. Air/wind

speed units
F. Barometric pressure units
G. RH unit

Fig. 2.
All possible display
indications

H. Temperature units
I. Lower readout
J. Wind Chill Index, Dew Point and Wet Bulb indicators
K. Measurement HOLD indicator
L. Memory pointer
M. Memory counter
N. Memory recall mode indicator
O. Low battery indicator
P

. Compass
Q. Bearing readout
R. Upper readout

E

F

G

H

5

SETUP INSTRUCTIONS

ACTIVATE BATTERY

1. Turn the meter over and use your thumbs or a coin to turn the
battery compartment cover (Fig. 1, Callout F) clockwise
30 degrees, in the direction marked OPEN.

2. Pull and discard the tab under the pre-installed battery.

3. Replace the battery compartment cover and turn it
counterclockwise 30 degrees until it snaps shut.

Complete Setup by carefully removing the plas
th

e LCD.

film protecting

tic

OPERATING INSTRUCTIONS

To power on the HHF-312, press the red button. The LCD
will illuminate with the backlight on and show all possible display
indications for 2 seconds. The unit will then automatically enter
the measurement mode in which it was operating when it
powered off. The backlight will turn off after 15 seconds if no
front-panel button is pressed during that period. Pressing any
button begins another

T

o power off the HHF-312, press and hold the button for at

least 2 seconds.
To change measurement mode, start by pressing the MODE

button. This will cause the icon of the current mode to begin
flashing on the top line. Then press the SET button once or twice,
until the icon of the mode you want begins flashing on the top line.

The figure below shows the three measurement modes in their
sequence of selection using the SET b

15 seconds of backlight.

utton.

VEL

6

RH

BP

When the icon of the mode you want appears, flashing, on the top
line, press the MODE button once to stop it from flashing. Doing
this will cause one or more measurement unit icons below to
begin flashing. Press the MODE button again to stop those icons
from flashing. This causes the meter to enter real-time
measurement mode for the chosen parameter (air/wind speed,
RH or barometric pressure).

To hold

any pair of measurements (“freeze” the readouts), briefly

press (but do not hold) the button (which has HOLD stenciled
above it). To release the hold and resume displaying real-time
values, briefly press the button again. This function is very useful
for making measurements in low light or when the source of air or
wind is above your head, below your knees, or around a corner. You
can make a measurement,

hold it, and then read the display up to

5 minutes later after positioning the LCD at eye level.
W

y do you have only 5 minutes? To extend battery life, the

h
HHF-312 automatically powers itself off following any 5-minute
period in which no front-panel button is pressed.

MEASURING AIR/WIND SPEED AND
TEMPERATURES

To make an air/wind speed measurement, unsnap the vane
and sensor protection cap (Fig. 1, Callout A) and let it hang from
th

e unit by the wrist strap. Turn the vane at the top of the unit
perpendicular to the source of air or wind. It makes no difference
whether the front of back of the vane faces the flow. The
measured air/wind speed value will appear on the upper readout.
Allow a few seconds for the reading to stabilize.

The HHF-312’s factory default air/wind speed measurement unit
is feet/minute (ft/m). To chan
p

ressing the UNIT button. This will cause ft/m to begin flashing on

ge the air speed unit, begin by

the right side of the upper readout (Fig. 2, Callout E). Then, within
15 seconds (before the backlight extinguishes), press the SET

7

button. This will change the flashing ft/m term to mph, also
flashing. Press the SET button again and mph will turn to knots.
Press it again to change knots to m/s.

Press the SET button as many times as
necessary until the air/wind speed unit
you prefer appears, flashing, at the
right of the upper readout. To save this
unit, press the UNIT button. The figure
at right shows the five available
air/wind speed units
s

equence.

in their selection

When you press the UNIT button to
save your preferred air/wind speed unit, °F—the HHF-312
factory default temperature measurement unit—will begin
flashing in the lower right corner of the LCD. To keep °F as the
temperature measurement unit, begin by pressing the UNIT
button. This will cause °F to stop flashing and the meter to
resume displaying real-time air/wind speed and temperature
measurements. To change the temperature unit to °C, press the

S

ET button, followed by the UNIT button to save the selection.

The HHF-312 will “remember” the air/wind speed and
temperature units (as well as its operating mode and other
selected units and parameters) in use each time it powers off and
will resume operating in that mode and with those units upon
restart. So if you always use ft/m and °F for air/win
temp

erature measurements, you need not perform any of the

d speed and

above steps. And if you always use the same air/wind speed and
temperature units (other than ft/m and °F), you need only perform
the above procedure once. Unlike many instruments, changing the
battery does not reset all units to their factory default.

As mentioned earlier, the HHF-312 automatically begins
measuring and displaying ambient tempe

display o

8

ther temperatures whose calculation includes the

rature upon startup. To

effect of wind speed or humidity (Wind Chill Index, or Wet Bulb
and Dew Point temperatures, respectively), begin by pressing the
MODE button with the meter operating in air/wind speed mode
(with VEL appearing on the top line of the LCD). This will cause
VEL to begin flashing. Then press the MODE button again. On
meters that have come fresh from the factory, this will cause the
three terms WCI, DEW and WET to a

ower readout (Fig. 2, Callout J). Within 15 seconds (before the

l

ppear, flashing, above the

backlight turns off), press the SET button as many times as
necessary until the temperature you want appears by itself,
flashing, above the lower readout. Note that the temperature
below changes with each press of the SET button. To save the
temperature you want, press the MODE button while its
abbreviated term (WCI,

DEW or WET)

is flashing.

As with air/wind speed units, the type of temperature you select
and save becomes the display default until you change it.

When operating in Wind Chill Index mode, make sure the vane is
perpendicular to the wind direction.

DISPLAYING MIN/MAX/AVG AIR
AND WIND SPEEDS

The HHF-312 keeps track of the maximum and minimum
(fastest and slowest) and average air speed values recorded over
a measurement “session”—the period of time during which you

ure speeds at multiple locations and/or speeds of multiple

meas
devices. The session begins when you power on the HHF-312;
it typically ends 5 minutes after you finish making measurements
with the activation of the APO function.

The value of being able to quickly determine, for example, the
fastest and slowest fans of a group should be obvious.

To display the m

d

uring a measurement session, press the DISP button as many

aximum, minimum or average air/wind speed

times as necessary until the label of the desired value (Max, Min

9

or Avg) appears above the upper
readout (Fig. 2, Callout D). The figure
at right shows the three available
session parameters in their selection
sequence relative to real-time
measurement mode.

MEASURING RELATIVE
HUMIDITY (RH)

To enter RH mode, press the SET
button with VEL flashing on the top line of the LCD. This will
change the flashing term to RH. To stop RH from flashing, press
the MODE button.

ow

The HHF-312 will n

display real-time RH values on the upper
readout and the current Wind Chill Index or Dew Point or Wet Bulb
temperature on the lower readout. To change the unit of
temperature measurement to or from °F or °C, press the SET
button, followed by the UNIT button to save the selection. To leave
the unit unchanged, press the UNIT button.

MEASURING BAROMETRIC PRESSURE

T button with RH

To enter barometric pressure mode, press th

e SE
flashing on the top line of the LCD. This will change the flashing
term to BP. To stop BP from flashing, press the MODE button.

You can now enter your preference for using the metric or Imperial
unit for barometric pressure—the kilopascal (kPa) or millibar
(mBAR), respectively. To change kPa to mBAR, begin by pressing
the UNIT button. This will cause kPa to begin flashing between

lower readouts (Fig. 2, Callout F). Then press the

the uppe

r and

SET button, followed by the UNIT button to save the selection.
Saving the selected barometric pressure unit will cause the

default temperature unit at the right of the lower readout to begin
flashing. To change the unit, press the SET button, followed by the
UNIT button to save the selection. To leave the unit unchanged,
press the UNIT button.

10

STORING AND RECALLING RECORDS

The HHF-312 can store up to 20 pairs of the measurements
shown on the upper and lower readouts for later recall in
chronological order (the order in which they were stored).

To store the pair of readings currently on-screen, press the
REC button. The readings will be stored at the location indicated

by the memory counter (Fig. 2, Callout M) above the memory
pointer JOB (Callout L). N

ote that

each press of the REC button
increments the memory counter by 1. The HHF-312’s memory is
nonvolatile, so stored pairs of readings (collectively called a
Record) are retained when the meter powers off, and also after
the battery is changed.

To recall one or more readings, make sure the meter is
operating in one of the three real-time measurement modes
(air/wind speed, RH or barometric pressure), with no t

erms
flashing on screen. Then press the RCL/DEL button once. This
will replace the term JOB by the memory recall mode indicator
Rec (Fig. 2, Callout N) above. Both readouts will switch to
displaying the oldest record saved (the pair of readings in memory
location 01).

To display the next-newest record, press the SET button. Continue
pressing the SET button to sequentially display all stored records
in the orde

r in which they were saved. Pressing the SET button

with the newest record on-screen resets the memory counter to

01. To exit memory recall mode, briefly press (but do not hold) the
RCL/DEL button. This will replace the term Rec above the storage

location number by the term JOB below it.
When the HHF-312’s 20-record memory is full, pressing the

REC button will not store the current pair of readings—in other
words, the

memory is not over-writing. To store readings with a

full memory, you must delete one or more records manually.

11

To delete an individual record, first make sure the meter is
operating in one of the three real-time measurement modes.
Then,

1. Press the RCL/DEL button to enter memory recall mode, with

Rec replacing JOB at the lower left of the LCD.

2. Press the SET button repeatedly until the record to be deleted is

on-screen, with its memory location number shown below Rec.

ton

3. Briefly press (but do not hold) the REC but

to delete the
record. This will change Rec to JOB (indicating exit from
memory recall mode) and change the readouts to the next­newest pair of stored readings. If no newer readings have been
stored, the readouts will switch to the next-oldest pair of
readings.

To bulk-erase the memory (delete all records), press and hold
the REC button for at least 2 seconds with the meter operating in

time measurement modes. This will reset the

one of its three

real-

memory counter to 01.

USING AND CALIBRATING THE COMPASS

The HHF-312 is equipped with a magnetometer (electronic
compass) capable of displaying direction within 45 degrees using
the standard terms N, NE, E, SE, S, SW, W and NW. Bearings are
simultaneously shown in two places: in the upper left corner of
the LCD (Fig. 2, Callout Q), and below it at the end of an ar
po

inting in that direction (Callout P).

row

To provide accurate readings, the compass should be calibrated
after each battery replacement. To begin the calibration
process, take the meter outdoors to minimize the effects of
indoor electromagnetic interference (EMI). Then:

1. Use the MODE and SET buttons to place the meter in air/wind
speed measurement mode, with VEL visible but not flashing on

f the

the top line o

12

LCD.

2. Press and hold the RCL/DEL button until OH appears on the
upper readout and OL appears on the lower readout.

3. Holding the meter facing up in front of you, rotate your body
through three full 360° turns.

4. Press and hold the RCL/DEL button until OH and OL are
replaced by real-time air/wind speed and temperature readings
on the upper and lower readouts.

SPECIFICATIONS

Air/Wind Speed Measurement Range:

80 to 5910 ft./min (0.4 to 30 m/s)

Air/Wind Speed Measurement Accuracy:

±(3% of full-scale value + 40 ft./min (0.2 m/s))

Air/Wind Speed Measurement Resolution: 1 ft./min (0.1 m/s)
Temperature Measurement Range: -4° to 158°F (-20° to 70°C)
Temperature Measurement Accuracy: ±1.8°F (1°C) from 14° to

104°F (-10° to 40°C); ±3.6°F (2°C) elsewhere in range

Temperat
Relative Humidity (RH) Measurement Range: 0 to 100%
RH Measurement Accuracy/Resolution: ±3% from 20 to 80%RH;

Dew Point Measurement Range: -67° to 122°F (-55° to 50°C)
Wet Bulb Measurement Range: -31° to 122°F (-35° to 50°C)
Barometric Pressure Measurement Range:

Barometric Pressure Measurement Accuracy/Resolution:

Response Time: <2 seconds for air/wind speed

ure Measurement Resolution: 0.1°

±5% elsewhere/ 0.1%RH

30 to 120 kPa (300 to 1200 mbar)

±1

kPa (0.1 mbar), from 70 to 115 kPa (700 to 1150 mbar);

±2 kPa (0.2 mbar) elsewhere in range

13

Display Size: 1.34 x 0.94 in. (34 x 24mm)
Auto Power Off Trigger: 5 minutes of front-panel inactivity
Backlight Duration: 15 seconds (without front-panel activity)
Current Consumption: <3 mA with backlight off,

<10 mA with backlight on

Operating Temperature: -4°to 158°F (-20° to 70°C)

@ 5 to 95%RH, non-condensing

Storage Temperature (without battery): -22° to 140°F

(-30° to 60°C) @ <85%RH

83

Dimensions: 5.

x 2.08 x 0.87 in. (148 x 53 x 22mm)
Weight (without battery): 2.93 oz. (83g)
Power Source: (1) “CR2032” battery (pre-installed)

MAINTENANCE TIPS

When the icon appears on the left side of the LCD (Fig. 2,
Callout O), it’s time to change the anemometer’s “CR2032” battery
(although measurements will remain valid for several hours after
the icon first appears). To change the battery, follow the Setup
Instructions on p. 6.

Remove the battery if you do not expect to use the HHF-312 for
an extended period of time (months or years).

Replace the vane and
following each measurement session.

Do not drop or disassemble the unit or immerse it in water.
Do not operate the HHF-312:

• Near a magnet

• Near equipment like arc welders and induction heaters that

generate an electromagnetic field

sensor protection cap (Fig. 1, Callout A)

14

• In environments full of water vapor, dust or static electricity
To clean the housing or LCD, use a dry or damp cloth. Avoid using

chemical cleaners.

15

OMEGA ENGINEERING, INC. warrants this unit to be free of defects in materials and
workmanship for a period of 13 months from date of purchase. OMEGA’s Warranty adds
an additional one (1) month grace period to the normal one (1) year product warranty to
cover handling and shipping time. This ensures that OMEGA’s customers receive maximum
coverage on each product.

If the unit malfunctions, it must be returned to the factory for evaluation. OMEGA’s Customer
Service Department will issue an Authorized Return (AR) number immediately upon phone
or written request. Upon examination by OMEGA, if the unit is found to be defective, it
will be repaired or replaced at no charge. OMEGA’s WARRANTY does not apply to defects
resulting from any action of the purchaser, including but not limited to mishandling,
improper interfacing, operation outside of design limits, improper repair, or unauthorized
modification. This WARRANTY is VOID if the unit shows evidence of having been tampered
with or shows evidence of having been damaged as a result of excessive corrosion; or
current, heat, moisture or vibration; improper specification; misapplication; misuse or
other operating conditions outside of OMEGA’s control. Components in which wear is not
warranted, include but are not limited to contact points, fuses, and triacs.

OMEGA is pleased to offer suggestions on the use of its various products.
However, OMEGA neither assumes responsibility for any omissions or errors
nor assumes liability for any damages that result from the use of its products
in accordance with information provided by OMEGA, either verbal or written.
OMEGA warrants only that the parts manufactured by the company will be as
specified and free of defects. OMEGA MAKES NO OTHER WARRANTIES OR
REPRESENTATIONS OF ANY KIND WHATSOEVER, EXPRESSED OR IMPLIED,
EXCEPT THAT OF TITLE, AND ALL IMPLIED WARRANTIES INCLUDING ANY
WARRANTY OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE HEREBY DISCLAIMED. LIMITATION OF LIABILITY: The remedies of purchaser
set forth herein are exclusive, and the total liability of OMEGA with respect to
this order, whether based on contract, warranty, negligence, indemnification,
strict liability or otherwise, shall not exceed the purchase price of the component
upon which liability is based. In no event shall OMEGA be liable for consequential,
incidental or special damages.

CONDITIONS: Equipment sold by OMEGA is not intended to be used, nor shall it be used:
(1) as a “Basic Component” under 10 CFR 21 (NRC), used in or with any nuclear installation
or activity; or (2) in medical applications or used on humans. Should any Product(s) be
used in or with any nuclear installation or activity, medical application, used on humans, or
misused in any way, OMEGA assumes no responsibility as set forth in our basic WARRANTY/
DISCLAIMER language, and, additionally, purchaser will indemnify OMEGA and hold
OMEGA harmless from any liability or damage whatsoever arising out of the use of the
Product(s) in such a manner.

WARRANTY/ DISCLAIMER

Direct all warranty and repair requests/inquiries to the OMEGA Customer Service Department.
BEFORE RETURNING ANY PRODUCT(S) TO OMEGA, PURCHASER MUST OBTAIN AN
AUTHORIZED RETURN (AR) NUMBER FROM OMEGA’S CUSTOMER SERVICE DEPARTMENT
(IN ORDER TO AVOID PROCESSING DELAYS). The assigned AR number should then be
marked on the outside of the return package and on any correspondence. The purchaser is
responsible for shipping charges, freight, insurance and proper packaging to prevent breakage in
transit.

FOR WARRANTY RETURNS, please have
the following information available BEFORE
contacting OMEGA:

1. Purchase Order number under which the
product was PURCHASED,

2. Model and serial number of the product
under warranty, and

3. Repair instructions and/or specific
problems relative to the product.

OMEGA’s policy is to make running changes, not model changes, whenever an improvement
is possible. This affords our customers the latest in technology and engineering.
OMEGA is a registered trademark of OMEGA ENGINEERING, INC.
© Copyright 2015 OMEGA ENGINEERING, INC. All rights reserved. This document may not
be copied, photocopied, reproduced, translated, or reduced to any electronic medium or
machine-readable form, in whole or in part, without the prior written consent of OMEGA
ENGINEERING, INC.

RETURN REQUESTS/ INQUIRIES

FOR NON-WARRANTY REPAIRS,
OMEGA for current repair charges. Have
the following information available BEFORE
contacting OMEGA:

1. Purchase Order number to cover the COST
of the repair,

2. Model and serial number of the product, and

3. Repair instructions and/or specific problems

relative to the product.

consult

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Process Measurement and Control?

OMEGA…Of Course!

Shop online at omega.com

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