- 20-
Revision 4.6 3/2004
The HHC will respond by displaying:
psi inHg inWC ftSW
Bar mBar kPa mPa
Using the arrow keys select the desired engineering unit
for the left side. In this example we have opted for the
engineering unit of Bar. With the Bar engineering unit
selected the display will look as follows with the text
“Bar” fl ashing:
psi inHg inWCf tSW
Bar mBar kPa mPa
Step 6
With the desired engineering unit selected
(fl ashing) press the enter key.
ENT
The HHC will respond by displaying the following:
Bar mA
+12345 +1234
Step 7
Reactivate the right side of the display for pres-
sure measurement by pressing the Port Select key, as
required.
First press of the port select key.
PORT
SEL
HHC will respond by displaying the following:
mA psi
+1234 +12345
Second press of the
PORT
SEL
HHC will respond by displaying the following:
Bar psi
+12345 +12345
Using this process, any engineering unit may be selected
for display of the right or left Quick Select pressure
module measurement data.
Section 8.5
Temperature Selection for H
2
O
Conversion Factor
The HHC includes a library of 12 factory programmed
engineering units. This selection includes the engineer-
ing units inH2O, mmH2O and cmH2O. The pressure
generated by a column of water will vary with the tem-
perature of the water.
Over the years, several temperatures have evolved into
industry standards. These are the conversion factors
most commonly used by manufacturers of pressure
instruments when calibrating pressure measurement
devices in terms of the height of a column of water. To
facilitate your calibration and test of these instruments,
the HHC includes 3 conversion factors for each of the
water column based pressure engineering units. The
conversion factors are for the temperatures of 4 and 20
degrees Celsius and 60 degrees Fahrenheit. The factory
default setting is 20 degrees C.
The selection of the desired temperature for use in the
conversion of water based pressure measurements can be
accomplished by following these steps.
Step 1
With the HHC on and reading pressure press the
SET UP key.
SET
UP
Step 2
Using the up/down and left/right arrow keys
select the H2O reference option displayed as “H2Oref”
in the set up menu. When selected the text “H2Oref”
will fl ash on the display.
BatFunc PerCent
UserEng H2Oref
Step 3
With the text “H2Oref” fl ashing press the
enter key.
ENT
The HHC will respond by displaying:
H2O ref temp
20C 60F 4C
Step 4
Using the left/right arrow keys select the
desired temperature for the conversion factor. The
selected value will fl ash on the display.
H2O ref temp
20C 60F 4C
In the above example the conversion factor for water at
60 degrees Fahrenheit was selected.
Step 5
With the desired temperature for the conversion
factor fl ashing press the enter key.
ENT
The selected conversion temperature will be activated
and will be stored in Electrically Erasable Program-
mable Read Only Memory (EEPROM). It will not have
to be reentered on power-up unless a change in the refer-
ence temperature is desired.
After pressing the enter key the HHC will resume basic
pressure measurement.
Содержание PTE-1
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