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PG9602™ OPERATION AND MAINTENANCE MANUAL
© 2011 Fluke Calibration
Page
100
2. The second head function is the head correction for the PG9000 reading of atmospheric
pressure that is used to calculate air density, and/or to add to atmospheric pressure in absolute
by adding atmosphere mode. The barometer reading atmospheric pressure may not be at the
same height as the piston reference level and, if so, a head correction is needed to determine
atmospheric pressure at the piston reference level. This head correction is referred to as ATM
head. The ATM head height can be edited by pressing
[SPECIAL]
and selecting
<3head>
,
<3atm>
. The ATM head is only applied to internal or external barometer readings. It is not
applied to normal or user values of atmospheric pressure.
3. The third head function is the automated correction for the piston position, referred to as
PISTON head. The PG9602 reference level marked on the mounting post is the level at
which pressures are defined when the piston is in midstroke position – 0.0 mm. As the
piston moves away from midstroke, the pressure definition reference level
moves proportionally. PG9000’s automated correction for piston position calculates the
head pressure corresponding to the change in piston position from midstroke and
compensates the defined pressure. In this way, the defined pressure calculated by
PG9000 is always the pressure at the reference level marked on the mounting post, even
if the piston is not at midstroke position. The PISTON head function can be turned ON
and OFF by pressing
[SPECIAL]
and selecting
<3head>
,
<4piston>
.
Note
See Section 7.2.2 for information on calculation of the three
fluid head correction functions.
OPERATION
To access various fluid HEAD correction functions press
[SPECIAL]
, and select
<3head>
. The display is:
Edit head: 1fluid
2unit 3atm 4piston
•
<1fluid>
to change the DUT head fluid (see Section 3.12.3.1).
•
<2unit>
to specify the DUT head height unit of measure (see Section 3.12.3.2).
•
<3atm>
to adjust the ATM head height (see Section 3.12.3.3).
•
<4piston>
to turn the PISTON head correction ON and OFF (see Section 3.12.3.4).
3.12.3.1 <3head>, <1fluid>
OPERATION
•
To specify the DUT head fluid (see
Section 3.12.3, PRINCIPLE), press
[SPECIAL]
and select
<3head>
,
<1fluid>
. The display is:
Head fluid:
1gas 2liquid
•
If
<1gas>
is selected, the display
offers the choice of three gasses.
Making a gas selection returns to the
previous run screen with that gas
active for the DUT head function.
The display is:
Gas type:
1N2 2He 3Air
•
If
<2liquid>
is selected, the display
offers the choice of oil, water or a
user defined liquid. If the user
defined liquid is selected, its density
must be specified. Making a liquid
selection returns to the previous run
screen with that liquid active for the
DUT head function. The display is:
Liquid type:
1oil 2H20 3user
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