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A
T
DVANCED
EMPERATURE
Since temperature stabilized units always operate at 20 °C, this accessory is provided
for ATC units only. The lowest analysis temperature that can be used without flowing
dry gas depends on the humidity of the air in the lab.
Moisture in the air can condense on exposed metal surfaces like valves and under the cap when
operating the instrument at low temperature. Condensation can cause some parts to rust and can
affect temperature control due to the high heat of vaporization of water.
Condensation can be prevented by flowing dry gas around the cold components. In the
AccuPyc III, a dry gas source, typically dry compressed air or nitrogen, can be connected to the
Dry Air port on the back of the instrument. The gas is directed through the area under the cap and
around the valves to displace room air.
The ATC regulates the flow of dry gas. It consists of a manual flow meter and valve for
establishing a flow rate of 100 to 200 sccm. The meter has a stand to keep it upright. Fittings and
flexible tubing for connecting the meter to instrument are provided. The customer supplies a
connection from the gas supply to a barbed fitting on the flow meter.
AccuPyc III Operator Manual
135-42800-01 (Rev -) — Nov 2023
C
(ATC)
ONTROL
A. Knob to adjust gas supply
B. Rotameter
C. Barbed male connector (2)
D. Bracket
A. Female fitting
B. Barbed male connector
Advanced Temperature Control (ATC)
1 - 7
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