Omega Products HHP350 Installation Manual

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User’s Guide

HHP350 SERIES

High Accuracy Manometer

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MADE IN

Servicing North America:

U.S.A.:

OMEGA Engineering, Inc.

ISO 9001 Certified

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]

Canada:

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:

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

®

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

®

Mexico:

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

Servicing Europe:

Benelux: Managed by the United Kingdom Office

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

Czech Republic: Frystatska 184

733 01 Karviná, Czech Republic
Toll-Free: 0800-1-66342 TEL: [phone]
FAX: [phone] e-mail: [e-mail]

France:

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

Germany/Austria:

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

United Kingdom:

OMEGA Engineering Ltd.

ISO 9001 Certified

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]

OMEGAnet®On-Line Service Internet e-mail

omega.com [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.

USER MANUAL

SMART MANOMETER

The Smart Manometer products are microcontroller based
pressure sensing devices used to directly measure pressure.
Differential, Gauge, Absolute and Wet/Wet pressure sensors
are supported (see Specification section for supported types
and pressure ranges). Pressure can be displayed in selectable
engineering units of measure.

Features include Min/Max capture, display Hold, sensor Zero,
Leak Test, Record/View (up to 240 points), user selectable
damping and field recalibration. The manometer is powered
by four AA alkaline batteries for more than 100 hours of use.

Page 1 of 28

Table of Contents

User Interface ............................................................3

Keypad Functions..................................................3

On/Off & Backspace
MIN/MAX & UP
HOLD & DOWN
PRGM & ENTER

Key ............................... 3

Arrow Key......................... 3

Arrow Key ........................3

Key ...................................4

BACKLIGHT KEY............................................. 4

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

Program Mode..................................................... 5

Units Select ...........................................................6

User Unit Select ....................................................7

Flow Unit Select.................................................... 8

Damp Rate Select .................................................. 8

User Info Select...................................................10

Auto Shut-Off......................................................11

Lockout Select..................................................... 12

Header Name.......................................................13

Contrast Select..................................................... 14

Data Logging....................................................... 15

Leak Test............................................................. 16

Re-Calibration ..................................................... 17

RE-CALIBRATION – 1 Point EDIT & START 18

RE-CALIBRATION – 5 Point EDIT ..................19

RE-CALALIBRATION – 5 Point START .........19

RE-CALIBRATION – Restore Factory Defaults 21

Specifications .......................................................... 22

Certification/Safety/Warnings ................................. 24

Changing the Batteries.............................................24

User Connections.....................................................26

Contact Information.................................................28

Page 2 of 28

User Interface

1. Keypad Functions

ON/OFF & BACKSPACE
Turns the manometer on and enters the unit into the Measure
Mode. Pressing the key while in the Measure Mode turns the unit
off. It also serves as a backspace key when editing in the Program
Mode. The

without changing the previous setting. Pressing this key repeatedly
will return the user to the Measure Mode and then shut off the
manometer.

MIN/MAX & UP

In the Measure Mode activates the Min/Max function of the
manometer. When activated the minimum value is displayed on the
upper left of the display and the maximum value on the upper right.
This key also deactivates and resets this function. The
used to scroll through the programmable registers when the unit is
in the Program Mode. Once a programmable register is selected
the

HOLD & DOWN

In the Measure Mode toggles on/off the display Hold function.
This freezes the value displayed. If the MIN/MAX function is
activated, those values are also frozen. With HOLD activated, the
letter “H” appears in the lower left of the display. The
used to scroll through programmable registers with the unit in the

key takes the user out of a programmable register

ARROW KEY

key can be used to edit that register.

KEY

key is

ARROW KEY

key is

Page 3 of 28

Program Mode. Once a programmable register is selected the
key can be used to edit that register.

PRGM & ENTER
Puts the manometer into the Program Mode from the Measure
Mode. When in the Program Mode, pressing this key selects the

programmable register to be edited (with prompt for password if
Lockout is set). After the register has been edited, pressing the
PRGM key enters the new setting into the manometer’s non­volatile memory. This key also acts as a

input such as the header name and user units.

BACKLIGHT KEY

The BACKLIGHT key, represented by the standard light bulb
symbol, toggles the display backlight between green and off.

KEY

key when editing user

Page 4 of 28

2. Zeroing the Manometer

To zero the manometer, first turn off pressure sources and vent
pressure ports to atmosphere. The display should read close to zero.
Press the MIN/MAX and HOLD keys at the same time and then
release. This begins the zeroing process. The top line of the display
reads “ZERO IN PROGRESS” while the bottom line counts down
from 9. The process is complete when the unit returns to Measure
Mode. The lockout function, if enabled, does not interfere with the
zeroing of the manometer.

Note: The Smart Manometer can only be zeroed if the new zero
value is within +/-5% (of FS) of the original factory calibrated zero.
If the zero procedure generates a new zero value outside this limit
a “ZERO RANGE ERROR” message appears indicating that the
procedure failed.

3. Program Mode

The program mode is used to configure the manometer for
Measure Mode operation. After the PRGM key is pressed in
Measure Mode, the top line of the display reads “PROGRAM
MODE”. The bottom line reads “UNITS SELECT”. Press the

arrow keys to scroll through the Program Mode to the desired

register. The configurable registers that are found in Program

Mode are Units Select, Damp Rate Select, User Info Select,
Contrast Select, Data Logging, Leak Test and Exit. Two sub-
modes under “Units Select” are provided: User Unit Select and
Flow Unit Select. Press the PRGM key to select either of these

sub-modes and set up their respective function. The manometer
can be put into Program Mode at any time during Measure Mode
operation by pressing the PRGM key. If Lockout is set, the correct
code must be entered when prompted.

or

Page 5 of 28

Units Select

The standard engineering units available on the Smart Manometer
are:

PSI
inH

0 (@20°C, 60°F and 4°C)

2

2

Kg/cm
kPa
mbars
Bars
cmH

O (@ 20°C)

2

inHg (@ 0°C)
mmHg (@ 0°C)
User Units
Flow Units

To change the engineering units the manometer should be “ON”
and in Measure Mode. Then follow these steps:

Keystroke Display

1. Press the PRGM key. Top line reads “PROGRAM
MODE” and bottom line reads
“UNITS SELECT”.

2. Press the PRGM key. Top line reads “UNITS
SELECT” and bottom line shows
current engineering units.

3. Press the or arrow

key until desired

Engineering units on bottom line
of display change.

engineering unit is
displayed.

4. Press the PRGM key to

select the engineering unit.

Top line reads “PROGRAM
MODE” and bottom line reads
“UNITS SELECT”.

5. Press the arrow key. Bottom line reads “EXIT”.

6. Press the PRGM key. Display returns to Measure Mode
in new engineering units.

Page 6 of 28

User Unit Select

Engineering units not included in the standard selection can be
programmed into the manometer using the Units Select register in
the program mode. The value programmed into this register is
used to calculate the desired unit of measure. An example of
converting to “Feet of H2O” will be shown in the following steps,
using the conversation factor of 1 PSI = 2.30894 FT H2O.

Keystroke Display

1. Press the PRGM key. Top line reads “PROGRAM

2. Press the PRGM key. Top line reads “UNITS

3. Press the or arrow

key until “USER UNIT
SELECT” is displayed.

4. Press the PRGM key.

See note 1 at bottom of
this table.

5. Press the PRGM key to

change the value.

6. Start entering the

conversion factor by
pressing the
until the first digit reads 2.

7. Press the arrow key

to enter the value “2” and
advance the cursor to the
next digit.

8. Repeat step 6 and 7

until bottom line reads

2.30894

9. If an error is made use

the
the cursor back to the
incorrect digit. Then press

or arrow keys to

display the correct value.

10. Press the PRGM key

until the display changes.

See note 1 at bottom of

arrow key

arrow key to move

MODE” and bottom line reads
“UNITS SELECT”.

SELECT” and bottom line shows
current engineering units.
Top line reads “UNITS
SELECT”
Bottom line reads “USER UNIT
SELECT”.
Top line reads “VALUE=”.
Bottom line reads “CHANGE?:
YES”.
Top line reads “USER UNIT
VALUE”.
Top line reads “USER UNIT
VALUE”.
Bottom line reads “20000000”.

Cursor flashes to the right of the
“2”. Now numbers, decimal
point or blank space can be
entered.
Bottom line reads “2.30894”.
Last digit “4” is blinking.

The digit that is corrected is
blinking.

Top line reads “VALUE=”.
Bottom line reads “CHANGE?:
YES”.

Page 7 of 28

this table.

11. Press the PRGM key. Top line reads “USER UNIT
NAME”.

12. Follow steps 6-8

above to enter “FT H2O”.

Bottom line reads “FT H2O”.
Last letter “O” is blinking.

13. Press the PRGM key. Top line reads “PROGRAM
MODE”.
Bottom line reads “UNITS
SELECT”.

14. Press the arrow

Bottom line reads “EXIT”.

key.

15. Press the PRGM key. Manometer returns to Measure
Mode. Units Display shows “FT
H2O”.

Note 1: If at steps 4 or 10 the “VALUE=” is the desired value,
press the

or arrow key. This will toggle the bottom line from
the default “CHANGE?: YES” to “CHANGE?: NO”. Step 5
would then jump to step 10. Step 11 would then jump to step 13.

Flow Unit Select

Smart Manometers that use differential pressure sensors can be
programmed to read out flow measurement units such as CFM or
L/min. The primary element must be a differential pressure ­square root type device such as a pitot tube, orifice plate or venturi.

The flow constant and flow units description are programmed into
the manometer using the same keystrokes used in the User Unit
Select programming. At step 3 choose “FLOW UNIT SELECT”
instead of “USER UNIT SELECT”.

Calculate the Flow constant from the following equation:
F

= Q ÷ DP

c

½

where: Fc = Flow constant
Q = Flow rate

(from flow element calculation sheet)

DP = Differential pressure corresponding to Q
Example: If the DP is 25 units when the flow rate is 10,000 units,
then the Flow constant is 2,000.

Damp Rate Select

Adjustable exponential type damping is available to steady the
display when measuring pulsating pressure or flow. The Smart
Manometer has a range of damping rates; 0.1, 0.2, 0.5, 1, 2, 5, 10,
or 25 seconds. Exponential damping shows approximately 70% of
a step change in pressure upon the next display update. When set

Page 8 of 28