Micromeritics AccuPyc 2 1340, Operator'S Manual

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AccuPyc II 1340 Preparing for Analysis
June 2013 4-1
4. GENERAL OPERATING INSTRUCTIONS
This chapter contains step-by-step procedures for common operations for the AccuPyc.
Preparing for Analysis
Setting Regulator Pressure
The Purge fill pressure and Cycle fill pressure are specified using Set Up > Analysis Parame-
ters (explained on page 3-11 ). Set the regulator pressure at the higher of the two (plus 2.0
psig). For example; if you have specified the Purge fill pressure as 19.500 psig and the Cycle
fill pressure as 19.000 psig, you should set your regulator pressure at 21.500 psig.
1. Be sure the tank pressure for the gas regulator is at least 200 psig. Pressures less than 200
psig indicate the tank is low on gas. Analyses are terminated automatically if gas is
depleted.
2. Press
Alt + 1
to enter manual mode.
3. Press 8 (EXPAND) and 9 (VENT) to open the expansion and vent valves; the second line
of the display should look like this: X - O - O
4. Press 7 (FILL) to open the fill valve; the second line of the display should look like this:
O - O - O
5. Adjust the regulator pressure control knob until the desired pressure is shown on the
regulator display.
6. Press
7
to close the fill valve, then increase the regulator valve by 2.0 psig; the second
line of the display should look like this: X - O - O .
7. Allow the pressure in the pycnometer to drop below 2.0 psig, then press
8
and
9
to close
the Expansion and Vent valves; the display should look like this: X - X - X
8. Press
SAVE
to return to the Reload prompt.
Pressure Control Knob