Omega HHP360 Series User manual

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U.S.A. Omega Engineering, Inc.
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(USA & Canada only)
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(USA & Canada only)
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(USA & Canada only)
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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.

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USER MANUAL
PRECISION ABSOLUTE MANOMETER
The Precision Absolute Manometer is a microprocessor based
pressure sensing device used to directly measure pressure
relative to absolute zero. Model HHP360-A measures pressure
from 0 – 17.403 PSIA and model HHP360-B measures
pressure from 0 – 38.674 PSIA. Pressure can be displayed in a
variety of English and S.I. engineering units. All HHP360s
include a Tare function, a Min/Max function, selectable damp
rates and altitude displayed in feet or meters. The HHP360
can also display barometric pressure corrected to sea level.

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Table of Contents
User Interface ............................................................ 5
Keypad Functions .................................................. 5
ON/OFF & BACKSPACE  KEY ................ 5
MIN/MAX & UP  ARROW KEY .............. 5
TARE & DOWN  KEY .............................. 6
PRGM & ENTER  KEY.............................. 6
BACKLIGHT KEY ........................................ 6
Zeroing the Manometer ......................................... 7
Program Mode ..................................................... 12
Units Select ......................................................... 13
Displaying Altitude (US Standard Atmosphere
1962) ................................................................... 14
Display User Defined Altitude ............................ 15
Pressure Corrected to Sea Level .......................... 17
Damp Rate Select ................................................ 19
User Info Select ................................................... 20
Auto Shut-Off ...................................................... 21
Lockout Select ..................................................... 22
Header Name ....................................................... 23
Contrast Select..................................................... 24
Data Logging ....................................................... 25
Leak Test ............................................................. 26
Re-Calibration ......................................................... 27
Re-Calibration – 1 Point EDIT and START ....... 28
Re-Calibration – 5 Point EDIT ............................ 29
Re-Calibration – 5 Point START ........................ 30
Re-Calibration – Restore Factory Defaults ......... 31
Specifications .......................................................... 32
Certification / Safety / Warnings ............................. 33
Changing the Batteries ............................................. 33

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User Interface
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.

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TARE & DOWN

KEY
In the Measure Mode toggles on/off the Tare function. The Tare
function is designed to set the display value to “0”. With Tare
activated, the letter “T” appears in the lower left of the display.
The  key is used to scroll through programmable registers with
the unit in the 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.

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Zeroing the Manometer
The HHP360 is a stable and precise instrument. However, on
occasion the handheld should have a new zero taken. This is done
to remove zero drift that can occur since it was last zeroed. The
HHP360 can be zeroed only if the new applied zero is within ± 1%
FS of the original factory calibration zero. This prevents accidental
zeroing at atmospheric pressure or other relatively high pressures.
If outside this limit a “ZERO RANGE ERROR” message appears
and the manometer will not zero.
The HHP360 provides three mechanisms for re-zeroing:
1. Referenced to Absolute Zero: This traditional and
preferred method takes a “snapshot” of the measured
pressure when a vacuum of less than 100 microns
Absolute is applied to the sensor.
2. Factory Zero: This method restores the calibration curve
to the original zero taken at the factory. Note that this
feature is intended for comparison purposes, and should
not be used for real pressure measurement, as any zero-
drift will not be compensated.
3. User-Adjusted Zero: This method allows the user to
enter any pressure value when a known reference is
applied (for example, the local barometer). The
manometer will compare its actual measured value with
the entered value, and calculate a new zero reference
based on the offset.

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1. To zero the manometer using Referenced to Absolute Zero,
start with the unit turned OFF and use the following
keystroke sequence:
Keystroke
Display
1. Press ON/OF button.
The display briefly shows the
header name and full scale range
of the unit in the last engineering
units selected. The manometer
then goes into the Measure
Mode where the applied pressure
and engineering unit of measure
are displayed.
2. Connect the HHP360 to
a vacuum source capable
of a vacuum of 100
microns absolute pressure
or less.
3. Pull a full vacuum.
Display should read close to
zero. (See note on next page)
4. Press MIN/MAX and
TARE keys at the same
time. (See figure 1 below.)
Top line of display reads
“ZEROING SOURCE:”
Bottom line of display reads
“REF TO ABS ZERO”
5. Press the PRGM key.
Top line of display reads “ZERO
IN PROGRESS” while bottom
line counts down from 9. Zeroing
is complete when unit returns to
Measure Mode.
Figure 1

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2. To zero the manometer using Factory Zero, start with the
unit turn ON and in Measure Mode and use the following
keystroke sequence:
Keystroke
Display
1. Press MIN/MAX
and TARE keys at
the same time. (See
figure 1 above.)
Top line of display reads
“ZEROING SOURCE:” Bottom
line of display reads “REF TO
ABS ZERO”
2. Press ▲ or ▼ arrow
key until desired
zero function is
shown on the bottom
line.
Bottom line of display
reads “FACTORY ZERO”
3. Press the PRGM
key.
Zeroing is complete when unit
returns to Measure Mode.
NOTE: The HHP360 can be zeroed only if the new applied zero is
within ± 1% FS of the original factory calibration zero. If outside
this limit a “ZERO RANGE ERROR” message appears and the
manometer will not zero. Contact the factory for support in this
case.

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3. To zero the manometer using User-Adjusted Zero, start with
the unit turn ON and in Measure Mode and use the
following keystroke sequence:
Keystroke
Display
1. Apply a known,
accurate pressure
source. This may be
true atmospheric
pressure, with known
reference defined by a
local barometer.
2. Press MIN/MAX and
TARE keys at the
same time. (See figure
1 above.)
Top line of display reads
“ZEROING SOURCE:”
Bottom line of display reads
“REF TO ABS ZERO”
3. Press ▲ or ▼ arrow
key until desired zero
function is shown on
the bottom line.
Bottom line of display reads
“USER ADJ. ZERO”
4. Press the PRGM key. Top line of display shows the
current non-zero compensated
pressure value. Bottom line of
display shows the same value,
along with the engineering unit.
5. Press any of ▲ or 
arrow key or the
PRGM key to begin
editing.
Example: set current
pressure value to 29.5
inHg @ 0º C.
Top line of display continuously
updates. Bottom line of display
data is ready for editing; the first
digit is blinking.