H25-IR
Operation
Instruction 3015-5286
43
move the blinking cursor across the screen to highlight the digit to be modified, and then using the
Up
and
Down
buttons to modify that digit. Press
ENT
to save the new ambient pressure value.
Tip:
To convert inHg into PSIA, multiply inHg by 0.491. For example: 30.00 inHg x 0.491 = 14.73 PSIA.
5.2.6.2 Flow Rate Sensor Calibration Screen (Factory Calibration)
Set the default factory calibration flow and pressure drop values by first performing an internal calibration as
described in Section
3.2 Internal Calibration
.
INT:
Flow rate in moles/minute for both the
S
earch and
M
easure modes after performing a calibration using the
internal
leak source, along with showing the manifold’s pressure drop.
FAC:
Flow rate and pressure drop values that are currently stored as the default
factory
calibration values.
These values are used to validate calibrations performed by the operator. A calibration error will occur if the
operator’s calibration and factory values differ by more than 20%.
Press
ENT
to store the internal calibration numbers as factory values. These are the calibration values that are
reset when RESTORE FACTORY CAL is selected from the CAL Data menu (refer to Section
3.5 Restoring
Factory Calibration)
.
5.2.6.3 Box Temperature Calibration Screen
In order to accurately determine when the internal leak source is running out of gas, the enclosure’s
temperature sensor must match the temperature of the leak source, as computed using the pressure/
temperature curve for the gas contained in the leak source and the measured pressure of the leak source.
Before making this adjustment, all enclosure lids must be in place and the instrument must be allowed to warm
up for at least 30 minutes.
Next, adjust the value displayed on the Box Temperature Calibration screen to match the calculated “LEAK”
temperature as displayed in the lower-right corner of the screen. In the example above, set the box temperature
for a reading of 28.41 by using the
Left
and
Right
buttons to move the blinking cursor across the screen to
highlight the digit to be modified, and then using the
Up
and
Down
buttons to modify that digit. Press
ENT
to
save the new box temperature value. Note that the “OFFSET” value is the difference between the box
temperature sensor reading, and the box temperature reading adjusted to match the leak source temperature.
5.2.7 Model Select
The Model Select function is used to set up the instrument’s operating characteristics as defined by its Part
Number (refer to Appendix “A”). Use the
Up
and
Down
buttons to select the appropriate Part Number (as
marked on the instrument’s rear panel). Press
ENT
to activate the selection.
S-Mpm/dP M-Mpm/dP
INT 0.0177/-1.33
0.0100/-2.28
FAC 0.0177/-1.33
0.0100/-2.28
ENTER TO SAVE INT AS FACTORY
ENTER BOX TEMP degC
2
8
.41
OFFSET=0.18 LEAK=28.41
MODEL SELECT
< 3015-5260 R134A
3015-5263
R600A
< 3015-5266 SF6
Summary of Contents for H25-IR
Page 6: ...Contents H25 IR iv Instruction 3015 5286 Notes ...
Page 26: ...Preparing for Operation H25 IR 20 Instruction 3015 5286 Notes ...
Page 34: ...Calibration H25 IR 28 Instruction 3015 5286 Notes ...
Page 43: ...H25 IR Operation Instruction 3015 5286 37 Notes ...
Page 68: ...Specifications H25 IR 62 Instruction 3015 5286 Notes ...
