Omega HHP350 Series User manual

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User’s Guide
HHP350 SERIES
High Accuracy Manometer
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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]
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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.

Page 1 of 28
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 2 of 28
Table of Contents
User Interface ............................................................3
Keypad Functions..................................................3
On/Off & Backspace Key ...............................3
MIN/MAX & UP Arrow Key.........................3
HOLD & DOWN Arrow Key ........................3
PRGM & ENTER 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 Defaults21
Specifications ..........................................................22
Certification/Safety/Warnings .................................24
Changing the Batteries.............................................24
User Connections.....................................................26
Contact Information.................................................28

Page 3 of 28
User Interface
1. Keypad Functions
ON/OFF & BACKSPACE KEY
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 key takes the user out of a programmable register
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 ARROW KEY
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 key is
used to scroll through the programmable registers when the unit is
in the Program Mode. Once a programmable register is selected
the key can be used to edit that register.
HOLD & DOWN ARROW KEY
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 key is
used to scroll through programmable registers with the unit in the

Page 4 of 28
Program Mode. Once a programmable register is selected the
key can be used to edit that register.
PRGM & ENTER KEY
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 non-
volatile memory. This key also acts as a key when editing user
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.

Page 5 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 or
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.

Page 6 of 28
Units Select
The standard engineering units available on the Smart Manometer
are:
PSI
inH
2
0 (@20°C, 60°F and 4°C)
Kg/cm
2
kPa
mbars
Bars
cmH
2
O (@ 20°C)
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 unit is
displayed.
Engineering units on bottom line
of display change.
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 7 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
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 “USER UNIT
SELECT” is displayed.
Top line reads “UNITS
SELECT”
Bottom line reads “USER UNIT
SELECT”.
4. Press the PRGM key.
See note 1 at bottom of
this table.
Top line reads “VALUE=”.
Bottom line reads “CHANGE?:
YES”.
5. Press the PRGM key to
change the value.
Top line reads “USER UNIT
VALUE”.
6. Start entering the
conversion factor by
pressing the arrow key
until the first digit reads 2.
Top line reads “USER UNIT
VALUE”.
Bottom line reads “20000000”.
7. Press the arrow key
to enter the value “2” and
advance the cursor to the
next digit.
Cursor flashes to the right of the
“2”. Now numbers, decimal
point or blank space can be
entered.
8. Repeat step 6 and 7
until bottom line reads
2.30894
Bottom line reads “2.30894”.
Last digit “4” is blinking.
9. If an error is made use
the arrow key to move
the cursor back to the
incorrect digit. Then press
or arrow keys to
display the correct value.
The digit that is corrected is
blinking.
10. Press the PRGM key
until the display changes.
See note 1 at bottom of
Top line reads “VALUE=”.
Bottom line reads “CHANGE?:
YES”.

Page 8 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
key.
Bottom line reads “EXIT”.
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
c
= Q ÷ DP
½
where: F
c
= 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 9 of 28
for 5 second time constant, it takes 5 seconds from the time of the
step change until the manometer displays the full value of the new
pressure.
To set the damp rate:
Keystroke Display
1. Follow the steps on
page 4 to put the unit in
Program Mode
Top line reads
PROGRAM MODE” and
bottom line reads “UNITS
SELECT”.
2. Press the arrow
key.
Bottom line reads “DAMP
RATE SELECT”.
3. Press the PRGM key. Top line reads “DAMP
RATE SELECT”.
4. Press the or
arrow key until the
desire desired damp rate
is displayed on the
bottom line.
Bottom line shows damp
rate in seconds.
5. Press the PRGM key. Top line reads
“PROGRAM MODE” and
bottom line reads “UNITS
SELECT”.
6. Press the arrow
key.
Bottom line reads
“EXIT”.
7. Press the PRGM key. Returns to Measure Mode.

Page 10 of 28
User Info Select
The User Info Select registers are designed to provide the user with
information on the hardware and software in the manometer. This
register provides read only information on the sensor’s serial
number, software version and date of manufacture. It also allows
the user to edit the Auto Shut-Off, Lockout and Start-Up Header
Name features.
To configure the User Info Select registers follow the steps shown
on the following page.
Keystroke Display
1. From the Measure Mode
press the PRGM key.
Top line reads “PROGRAM
MODE” and bottom line reads
“UNITS SELECT”.
2. Press the arrow key
twice
Bottom line changes to “USER
INFO SELECT”.
3. Press the PRGM key. Bottom line shows serial
number.
4. Press the arrow key. Software version number
shown.
5. Press the arrow key. Manufacture date shown.
6. Press the arrow key.
Instructions to set AUTO
SHUT-OFF are in this
manual.
Top line reads “AUTO SHUT
OFF” and bottom line reads
“ENTER TO SELECT”.
7. Press the arrow key.
Instructions for using
LOCKOUT are on page 12.
Top line reads “LOCKOUT
CODE” and bottom line reads
“ENTER TO SELECT”.
8. Press the arrow key.
Instructions for editing the
Header are on page 13.
Top line reads “HEADER
NAME” and bottom line reads
“text”. The cursor flashes at
bottom left.
9. Press the arrow key to
go back to “USER INFO
SELECT” screen.
Top line reads “PROGRAM
MODE” and bottom line reads
“USER INFO SELECT”.

Page 11 of 28
Auto Shut-Off
Enabling the Auto Shut-Off feature allows the manometer to turn
itself off after a user selected period of keypad inactivity.
Selectable options include DISABLED, 10 Minutes (which is the
factory shipped default), 20 Minutes, 30 Minutes, 45 Minutes and
60 Minutes. Disabling this feature limits the manometer to being
turned off by using the ON/OFF key only.
To configure auto shut-off follow these steps:
Keystroke Display
1. Follow steps 1-6 in the
User Info Select table.
Top line reads “AUTO SHUT-
OFF” and bottom line reads
“ENTER TO SELECT”.
2. Press the PRGM key,
then the or arrow
keys until the desired
shut-off time is shown.
Top line reads “AUTO SHUT-
OFF” and bottom line toggles to
“DISABLED”, “10”, “20”, “30”,
“45” and “60” minutes .
3. Press the PRGM key. Desired Auto Shut-Off time is
selected, top line reads “AUTO
SHUT-OFF” and bottom line
reads “ENTER TO SELECT”.
4. Press the arrow key
twice.
Returns to Measure Mode.
Note: The “Auto Shut-Off” timer is suspended during Data
Logging and Leak Test sessions to prevent accidental loss of
information. Auto Shut-Off is re-instated after completion of Data-
Logging or Leak Test sessions.

Page 12 of 28
Lockout Select
Enabling the Lockout feature prevents unauthorized users from
making changes to the configuration of the manometer. To enter
the Program Mode, the user must first enter the “password” (two-
digit Lockout Code) within approximately 40 seconds when
prompted. Failure to enter the correct two digit code within
approximately 40 seconds will return the unit to Measure Mode.
Any two-digit numeric code can be programmed. The factory
Lockout Code of 00 (which is the default as shipped from the
factory) disables the Lockout.
To set the Lockout Code follow these steps:
Keystroke Display
1. From the Measure
Mode press the PRGM
key. If the Lockout is set,
enter the correct
“password” when
prompted.
Top line reads “PROGRAM
MODE” and bottom line reads
“UNITS SELECT”.
2. Press the arrow key
twice.
Bottom line reads “USER INFO
SELECT”.
3. Press the arrow key
then the arrow key four
times.
Top line reads “LOCKOUT
CODE” and bottom line reads
“ENTER TO SELECT”.
4. Press the arrow key,
then press the or
arrow keys to change the
first digit. Press the
arrow key to proceed.
Bottom line shows the old
Lockout Code. The cursor flashes
at the first position while the
value is changed, the cursor
moves to the right position once
the right arrow key is pressed.
5. Press the arrow key
when the desired code is
set. Lockout is activated.
Top line reads “LOCKOUT
CODE” and bottom line reads
“ENTER TO SELECT”.
6. Press the arrow key
twice.
Returns to Measure Mode.

Page 13 of 28
Header Name
Follow the steps below to edit the Header Name.
Keystroke Display
1. From the Measure Mode
press the PRGM key.
Top line reads “PROGRAM
MODE” and bottom line reads
“UNITS SELECT”.
2. Press the arrow key
twice.
Bottom line changes to “USER
INFO SELECT”.
3. Press the PRGM key. Bottom line shows serial
number.
4. Press the arrow key
five times.
Top line reads “HEADER
NAME” and bottom line reads
“text”. The cursor flashes at
bottom left.
5. If header is correct press
backspace key. If editing is
desired proceed to step 7.
Top line reads “PROGRAM
MODE” and bottom line reads
“USER INFO SELECT”.
6. Press the arrow key. Returns to Measure Mode.
7. Press the or arrow
keys to set the correct
alpha-numeric value.
Displays a number between 0
and 9, a letter from A to Z, / or a
blank space.
8. Press the arrow key to
accept entry.
Cursor advances one space to
right.
9. Repeat steps 8 and 9
until the desired Header is
shown.
10. If an error is made press
the back arrow key until the
cursor is over the incorrect
value. Follow step 8 to
correct. Press the arrow
key to advance the cursor
without changing values.
11. When the Header is
complete press the PRGM
key until header accepted.
Top line reads “PROGRAM
MODE” and bottom line reads
“UNITS SELECT”.
12. Press the arrow key. Returns to Measure Mode.

Page 14 of 28
Contrast Select
The Contrast Select register allows the user to adjust the character
contrast of the LCD display to provide the best visibility for the
ambient light conditions.
To adjust the contrast, follow these steps:
Keystroke Display
1. From the Measure Mode
press the PRGM key.
Top line reads “PROGRAM
MODE” and bottom line reads
“UNITS SELECT”.
2. Press the arrow key
three times.
Bottom line reads
“CONTRAST SELECT”.
3. Press the PRGM key. Top line reads “CONTRAST
SELECT” and bottom line
shows a numerical value.
4. Press the or arrow
keys to increase or decrease
the contrast value. A low
number gives maximum
contrast and a high number
gives minimum contrast.
LCD lightens or darkens
depending on the value set.
5. Press the PRGM key. Top line reads “PROGRAM
MODE” and bottom line reads
“UNITS SELECT”.
6. Press the arrow key. Returns to Measure Mode.
If an error is made during thecontrast adjustment, pressing the key
returns the display to the previous contrast setting.

Page 15 of 28
Data Logging
Data Logging can be used to record pressure measurements. Two
record modes are supported: automatic and manual. In automatic
mode, a pressure value is captured every 5 seconds for 20 minutes,
resulting in 240 stored values. In manual mode, a pressure value is
captured each time the PRGM key is pressed up to 240 values. The
data collected during a logging session can be viewed upon
completion.
Keystroke Display
1. From the Measure Mode
press the PRGM key.
Top line reads “PROGRAM
MODE” and bottom line reads
“UNITS SELECT”.
2. Press the arrow key
four times.
Bottom line reads “DATA
LOGGING”.
3. Press the PRGM key. Top line reads “DATA
LOGGING” and bottom line
reads “RECORD”.
4. Press the PRGM key. Top line reads “RECORD
MODE” and bottom line reads
“AUTO” or “MANUAL”.
5. Press the PRGM key at
AUTO to start automatic
logging or at MANUAL to
start manual logging mode.
Top line reads
“RECORDING X” and
bottom line reads “XX.XX
UNITS”. AUTO records value
every 5 seconds. Manual
records value each time PRGM
key is pressed.
6. To stop recording values
at any time, press the key.
Top line reads “DATA
LOGGING” and bottom line
reads “RECORD”.
7. To access recorded
values, press the key.
Top line reads “DATA
LOGGING” and bottom line
reads “VIEW”.
8. To view recorded values,
press the PRGM key.
Top line reads “DATA LOG:
1” and bottom line displays
the value. Continue pressing
the key to view all values.
9. Press the key 3 times. Returns to Measure Mode.
The “Auto Shut-Off” timer is disabled for Data Logging sessions.
Be sure to end the session to re-enable the Auto Shut-Off timer.

Page 16 of 28
Leak Test
The Leak Test feature allows the user to determine the leak rate in
the pneumatic system being monitored. Once configured, Leak
Test monitors the measured pressure over time and displays the
leak rate in the pressure units per minute at the conclusion of the
test. The maximum configurable leak test period is 1440 min (1
day). Pressing any key during the leak test will abort the test.
To enable Leak Test follow these steps:
Keystroke Display
1. From the Measure Mode
press the PRGM key.
Top line reads “PROGRAM
MODE” and bottom line reads
“UNITS SELECT”.
2. Press the arrow key
twice.
Bottom line reads “LEAK
TEST”
3. Press the PRGM key. Top line reads “LEAK TEST”
and bottom line reads
“CONFIGURE”.
4. Press the PRGM key. Top line reads “Leak Test
Period” & bottom “X.X MIN”.
5. Use the , & keys
to input test period
Bottom line reads desired
period; Ex. “ 20.0 MIN”.
6. Press the PRGM key. Top line reads “LEAK TEST”
and bottom line reads
“CONFIGURE”.
7. Press the arrow key
once.
Top line reads “LEAK TEST”
and bottom line reads “PRGM
TO START”.
8. Press the PRGM key. Top line displays MIN/MAX
pressure values at left/right.
Bottom line reads the current
pressure value and units.
At end of test period, top line
displays the leak rate in units
per minute. Bottom line shows
the current pressure reading.
The “Auto Shut-Off” timer is disabled for Leak Test sessions. Be
sure to end the session to re-enable the Auto Shut-Off timer.

Page 17 of 28
Re-Calibration
The manometer can be re-calibrated in the field for zero, span, and
linearity. The proper primary standards must be available prior to
calibrating the manometer. These standards should meet the
accuracy requirements for your company or industry. The factory
follows the guidelines established by ANSI / NCSL Z540-1-1994
which requires that the primary standard be 4 times more accurate
than the unit under test.
The re-calibration is not intended to replace the Factory Lab
Calibration Procedure. It is intended to correct the curve fit if the
actual sensor characteristics change slightly over time.
For sensors up to 200 PSI, the factory recommends a ±0.0015% of
reading deadweight tester. For sensors 200 PSI and above, a
±0.0030% of reading deadweight tester is recommended. If
calibrating using inches of water units, be sure to match the
reference temperature of water in both the unit under test and the
manometer.
1-point (within upper 50% of Full Scale), 5-point (nominal values
of 0%, 25%, 50%, 75% & 100% of Full Scale), and restore factory
default re-calibration options are offered. For the 5-Point re-
calibration, points 2, 3 and 4 can be adjusted within ±1% of
reading around the nominal values. Point #5 can be adjusted within
-1% of reading around nominal. Point #1 is fixed.
For example: for a 2000 inH2O sensor, Point # 2 (25%) can be
edited form 495 to 505 inH2O. Point #5 (100%) can be edited
from 1980 to 2000 inH2O.
The unit can only be re-calibrated if the calibration points are
within 5 times the accuracy of the original factory calibration (e.g.
@ 0.05% accuracy, the point limit is ±0.25% of Full Scale). If the
re-calibration procedure generates a new value outside this limit
the procedure will fail. In this case the unit would need to be
returned to the factory for service.
Once a re-calibration has been performed (either 1-point or 5-
point) the unit will continue to allow future re-calibrations only
with that type of re-calibration. In order to enable the other re-
calibration type, the user must first restore the re-calibration data to
the factory defaults.

Page 18 of 28
RE-CALIBRATION – 1 Point EDIT and START
To perform a 1-point re-calibration, apply a pressure between 50%
and 100% of Full Scale and then follow these steps:
Keystroke Display
1. With unit OFF, press and
hold the MIN/MAX key,
turn the unit on by pressing
the ON/OFF key, then
release MIN/MAX.
Top line reads “RE-CAL”.
Bottom line reads “EDIT”.
2. Press the arrow key
until “START” is displayed
on the bottom line.
Top line reads “RE-CAL”.
Bottom line reads “START”.
3. Press the PRGM key. Top line reads “RE-CAL
START”.
Bottom line reads “1-POINT”.
4. Press the PRGM key. Top line reads “CAL POINT”
and bottom line displays the
cal point value.
5. Press the or arrow
keys to edit the selected
digit. Use the or arrow
keys to change the cursor
position. Value entered must
be 50-100% of FS.
Bottom line displays the cal
point value. The cursor flashes
at the first position while the
value is changed, then moves
to the right position when the
right arrow key is pressed.
6. Press the arrow key
while on the right most digit
to proceed.
Top line reads “APPLY:”
Bottom line displays the “CAL
POINT” value.
7. Apply the input pressure
indicated using an
appropriate reference
standard; press PRGM key.
Top line reads “RE-CAL”.
Bottom line reads “START”,
Manometer has been
recalibrated.
8. Press the arrow key. Returns to Measure Mode