Omega Products HHP241 Installation Manual

User’s Guide

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HHP241 SERIES

Digital Manometer

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OMEGA Engineering, Inc.
One Omega Drive, P.O. Box 4047
Stamford, CT 06907-0047 USA
Toll-Free: 1-800-826-6342 TEL: [phone]
FAX: [phone] e-mail: [e-mail]

976 Bergar
Laval (Quebec), Canada H7L 5A1
Toll-Free: 1-800-826-6342 TEL: [phone]
FAX: [phone] e-mail: [e-mail]

For immediate technical or application assistance:

Servicing North America:

U.S.A. and Sales Service: 1-800-826-6342/1-800-TC-OMEGA
Canada: Customer Service: 1-800-622-2378/1-800-622-BEST

Mexico:

Engineering Service: 1-800-872-9436/1-800-USA-WHEN

En Espan˜ol: 001 [phone] FAX: [phone]
[e-mail] e-mail: [e-mail]

Servicing Europe:

Benelux: Managed by the United Kingdom Office

Czech Republic: Frystatska 184

France:

Germany/
Austria:

United Kingdom:

ISO 9001 Certified

Toll-Free: 0800 099 3344 TEL: [phone]
FAX: [phone] e-mail: [e-mail]

733 01 Karviná, Czech Republic
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FAX: [phone] e-mail: [e-mail]

Managed by the United Kingdom Office
Toll-Free: 0800 466 342 TEL: [phone]
FAX: [phone] e-mail: [e-mail]

Daimlerstrasse 26
D-75392 Deckenpfronn, Germany
Toll-Free: 0 800 6397678 TEL: [phone]
FAX: [phone] e-mail: [e-mail]

OMEGA Engineering Ltd.
One Omega Drive, River Bend Technology Centre
Northbank , Irlam, Manchester M44 5BD England
Toll-Free: 0800-488-488 TEL: [phone]
FAX: [phone] e-mail: [e-mail]

®

®

®

It is the policy of OMEGA Engineering, Inc. to comply with all worldwide
safety and EMC/EMI regulations that apply. OMEGA is constantly pursuing
certification of its products to the European New Approach Directives.
OMEGA will add the CE mark to every appropriate device upon certification.

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.
WARNING: These products are not designed for use in, and should not be
used for, human applications.

DIGITAL MANOMETER

USER MANUAL

This Digital Manometer handheld instrument is a
microcontroller-based sensing device used to directly measure
pressure of clean, dry, non-corrosive gases. Differential,
Gauge and Absolute pressure sensors are supported up to 100
PSI. Pressure can be displayed in selectable engineering units
of PSI, bar, mbar, kPa, mmHg, inHg, mmH2O or inH2O.

Page 1 of 17

Table of Contents

Introduction ...............................................................3

User Interface.......................................................... 4

Single Keypad Functions ...........................................4

ON/OFF (O) Key.................................................... 4

BACKLIGHT (B) Key ...........................................4

FUNC (F) Key ........................................................ 4

UNIT (U) Key......................................................... 4

Zeroing the Digital Manometer .................................5

Functional Modes ......................................................5

Liquid Crystal Display (LCD) ................................ 6

Engineering Units Select ........................................7

Record Mode .......................................................... 8

Auto Shut-Off .........................................................9

Field Recalibration ..................................................10

ZERO....................................................................10

SPAN.................................................................... 10

Restore Factory Defaults ......................................11

Specifications .......................................................... 12

Certification/Safety/Warnings .................................14

Changing the Batteries.............................................14

User Connections.....................................................16

Contact Information.................................................17

Page 2 of 17

Introduction

Thank you for purchasing the Digital Manometer (DM) handheld.

The DM has been designed using the latest technology to provide
reliable accuracy throughout its entire operating temperature range,
dependable operation, and exceptional battery life.

The compact design makes the unit easy to carry and the intuitive
user interface makes it easy to use.

Pressure measurements are displayed on a large, easy-to-read
liquid crystal display (LCD). This unit has two backlights: a green
backlight which is user activated, and an automatic red backlight
which indicates an error/over-range condition.

Four keys provide direct access to frequently used functions (like
Un

its, Backlight). Other, less frequently used functions (like Zero,
Span, and Record) are accessible via multiple key combinations. A
complete list of these functions is printed on the back of the case.

Page 3 of 17

User Interface

Single Keypad Functions

ON/OFF (O) Key

The ON/OFF key, represented by the standard ON/OFF symbol,
turns the DM ON or OFF (note: the ON/OFF key must be held
until the display turns on or off). Upon power on, the DM will
perform a self test, display all segments for approximately 1-2
seconds, then go into the normal pressure measure mode using the
last pressure units selected.

To view the calibrated accuracy and firmware revision, press and
hold the ON/OFF key for approximately 2 seconds upon power on.
The display will alternate between the calibrated accuracy and
firmware revision for as long as the ON/OFF key is held.

BACKLIGHT (B) Key

The BACKLIGHT key, represented by the standard light-bulb
symbol, turns the green display backlight on and off. The backlight
will remain on for approximately 20 seconds if not manually
turned off. To temporarily override the auto shut off feature, press
and hold the BACKLIGHT key for approximately 2 seconds (until
the backlight turns on-off-on).

FUNC (F) Key

This key selects the functional mode of the DM. Detailed
instructions are provided on the back of the unit and in the
subsequent sections.

UNIT (U) Key

This key selects the engineering unit of measure desired when the
DM is in NORMAL or TEMP mode.

Page 4 of 17

1. Zeroing the Digital Manometer

To Zero the DM, first turn off pressure sources and vent pressure
ports to atmosphere. Then simultaneously press and hold the F
and U keys until “F.CAL” is displayed. The display will read “---­” during the zeroing process. The process is complete when the
display changes from “----” to a “zero” reading.

Note: The DM can only be zeroed if the measured zero is within

±2.5% (of FS) of the factory calibrated zero limit. Further
details are provided under Field Recalibration.

2. Functional Modes

The DM supports NORMAL and TEMP modes. The NORMAL
mode of operation has an additional sub-mode referred to as
“REC” or record mode, which is described later.

For Pressure measurements:

The red backlight will illuminate when the DM is measuring
pressure values outside its calibrated range. When the red backlight
is on, the accuracy of these measurements is uncharacterized.

Beyond 110% of the calibrated range, “----” will be displayed. The
red backlight will be illuminated in both cases.

The minimum and maximum pressure the DM has measured is
permanently recorded for factory warranty issues.

For Temperature measurements:

• Selecting the TEMP mode (the °F or °C icon) will display the
internal ambient temperature of the DM.

o the UNIT key will toggle between °F and °C

The minimum and maximum temperature the DM has
measured is permanently recorded for factory warranty issues.

Page 5 of 17