Heise PTE-1, Operating Manual

Page: 17 / 80

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Revision 4.6 3/2004
Result from pressing mA/V key a second time:
psi volts
+1.234
Result from pressing mA/V key a third time:
psi mA
+1.234
Using the combination of the port select function and the
mA/V function any combination of electrical measure-
ments and pressure measurements can be produced.
Section 8.0 Engineering Unit Selection-Pressure
Measurement
The HHC is factory programmed to provide pressure
measurement in 12 engineering units. These include; psi,
inches of mercury, inches of water, feet of sea water, bar,
mbar, kilopascal, megapascal, millimeters of mercury,
centimeters of water, millimeters of water and killograms
per square centimeter.
Pressure measurement data may also be displayed in a
user programmable non-library engineering unit. Section
8.2 Programming a Custom (User) Defi ned Engineering
Unit provides complete details on setting up an operator
defi ned engineering unit.
Inch, centimeter and millimeter of water engineering
units may be set up for conversion at temperatures of
4 degrees and 20 degrees C or 60 degrees F. Consult
Section 8.5 H
2
O Reference Temperature Selection to pro-
gram the desired temperature for inches or centimeters of
water conversions.
Section 8.1 Selecting a Factory Programmed
Engineering Unit
To select an engineering unit from the on-board library
follow the steps below:
Step 1 With the HHC on and displaying pressure mea-
surement data press the engineering unit key. This key is
designated ENG UNIT.
ENG
UNIT
The HHC will respond by displaying the engineering unit
library as follows:
fi rst screen:
psi inHg inWC ftSW
Bar mBar kPa mPa
second screen:
mm Hgcm WCmm WCkgcm
user
The engineering unit abbreviations correspond to the
following engineering units:
psi: pounds per square inch
inHg: inches of mercury
inH2O: inches of water column*
ftSW: feet of sea water
Bar: bar
mBar: millibar
kpa: kiloPascals
mPa: megaPascals
mmHg: millimeters of mercury
cmWC: centimeters of water column*
mmWC: millimeters of water column*
kgcm: kilograms per square centimeter
user: user programmable engineering unit
(see Section 8.2 for details)
*Conversion factor is programmable for temperature.
Consult Section 8.5 for details.
Step 2 Using the left/right and up/down arrow keys
select the desired engineering unit. When selected, the
text for the desired engineering unit will fl ash.
psi inHg,inWCftSW
Bar mBar kPa mPa
In the above example mBar is the selected unit.
Step 3 With the desired engineering unit fl ashing press
the enter key.
ENT
The calibrator will respond by displaying the pressure
measurement(s) in the newly selected engineering unit.
If two Quick Select pressure modules are installed the
output of both will be displayed in the selected engi-
neering unit. The HHC can also display the measure-
ment data of two installed Quick Select pressure
modules in independent engineering units. Section 8.4
provides the set up procedures for dual sensor dual
engineering unit operation.
Section 8.2 Setting up a Custom or User
Defi ned Engineering Unit
The HHC has a user programmable engineering unit
available. This allows for the display of pressure mea-
surement data in an engineering unit that is not in the
library of the HHC. Any unit of pressure measurement
that is linearly proportional to pressure change can be
programmed for use in the user engineering unit fi eld.
For this example, the pressure measurement unit of
mSW (meters of sea water) will be used as the desired
user engineering unit. To set the user engineering unit
to provide pressure measurement data in mSW follow