Omega Products HHP242 Installation Manual

User’s Guide

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®

®

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.

PRESSURE CALIBRATOR

USER MANUAL

This Pressure Calibrator instrument is a microcontroller based
pressure sensing device that can be used to directly measure
pressure. 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 18

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 PC ........................................................5

Set Functional Mode...............................................5

Liquid Crystal Display (LCD) ................................7

Engineering Units Select.........................................8

Record Mode...........................................................9

Auto Shut-Off .......................................................10

Field Recalibration...................................................11

ZERO....................................................................11

SPAN ....................................................................12

Restore Factory Defaults.......................................12

Specifications...........................................................13

Certification/Safety/Warnings .................................15

Changing the Batteries.............................................15

User Connections.....................................................17

Contact Information.................................................18

Page 2 of 18

Introduction

Thank you for purchasing this Pressure Calibrator (PC) product.

The PC 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 Units,
Backlight). Other, less frequently used functions
Record) are accessible via multiple key combinations. A complete list of these
functions is printed on the back of the case.

ke Zero, Span, and

(li

Page 3 of 18

User Interface

Single Keypad Functions

ON/OFF (O) Key

The ON/OFF key, represented by the standard ON/OFF symbol, turns the PC
ON or OFF (note: the ON/OFF key must be held until the display turns on or
off). Upon power on, the PC 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 PC. There are 5 functional modes:
NORMAL (pressure measure), HOLD, MIN/MAX, AVE and TEMP.
Pressing FUNC repeatedly will cycle through these modes in the order listed.
Since HOLD is first in the sequence, measurements can be readily captured as
needed.

UNIT (U) Key

This key selects the engineering unit of measure desired when the PC is in
NORMAL and HOLD modes. The UNIT key selects MIN or MAX in
MIN/MAX mode, resets/restarts in AVE mode, and selects °C or °F in TEMP
mode.

Page 4 of 18

Zeroing the PC

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

Note: The PC can only be zeroed if the applied pressure is within ±1% of the

full scale range. Further details are provided under Field
Recalibration.

Set Functional Mode

There are 5 possible modes: NORMAL, HOLD, MIN/MAX, AVE and TEMP
(°F or °C). NORMAL (pressure measure mode) is the default on power up,
and is active when the latter four modes are not displayed on the LCD.

Functional Modes

HOLD Freezes the pressure measurement on the

display, however, the bar graph is still active
MIN/MAX Displays the MIN and MAX pressures
AVE Displays a filtered average of the pressure

measurements
TEMP Displays the internal ambient temperature of the

PC

The NORMAL mode has an additional sub mode referred to as “REC” or
record mode, which is described later.

keys until

Page 5 of 18