113
P a r r I n s t r u m e n t C o m p a n y
1 - 8 0 0 - 8 7 2 - 7 7 2 0
5
O p t i o n a l F i t t i n g s
Liquid Charging Systems
High Pressure Gas Burettes
P
arr offers a series of high
pressure burettes intended
to introduce gas (commonly
hydrogen) to a reactor at a
constant pressure. The burettes
consist of a high pressure
reservoir equipped with an
inlet valve, a pressure gage
and a relief valve. A constant
pressure regulator with a check
valve, a connecting hose and
a support stand are included
with each pipette.
The amount of gas con-
sumed in a reaction can be
determined by knowing the
volume of the high pressure
reservoir and observing the
pressure drop in the reservoir
during a reaction.
Liquid Metering Pumps
L
iquid metering pumps are
commonly used to intro-
duce liquids into a reactor or
vessel at elevated pressures
on a continuous basis. A wide
variety of pumps are available
to meet various pressure, flow,
and control requirements. The
pumps listed here cover some
of the more common pressure
and flow requirements associ-
ated with Parr reactors and
pressure vessels. The pumps
described under these catalog
numbers include an inlet filter,
a reverse-flow check valve
and the outlet tubing to the
reactor. Special pumps can
be furnished to meet require-
ments outside the range of
these pumps.
High Pressure Gas Burettes
Burette
Delivery Pressure Range
Volume, mL Maximum
Pressure, psi
Total H
2
Volume,
Moles
0-1800 psi
0-1200 psi
0-700 psi
150
1800
0.8
A2280HC
A2280HC2
A2280HC3
300
1800
1.5
A2281HC
A2281HC2 A2281HC3
500
1800
2.6
A2282HC
A2282HC2 A2282HC3
1000
1800
5.1
A2283HC
A2283HC2 A2283HC3
2250
1800
11.5
A2284HC
A2284HC2
A2284HC3
500
5000
7.1
A2285HC
A2285HC2 A2285HC3
A2283HC High Pressure Gas Burette
Liquid Metering Pumps
Part No.
Flow Rate,
mL/min
Pressure,
Max. psi
Wetted
Material
Remote
Control
0-10 VDC
A2286HC
0.01-10
2500
PEEK
No
A2287HC
0.01-10
5000
Stainless
No
A2288HC
0.04-40
1500
Stainless
No
A2289HC
0.01-10
5000
Stainless
Yes
A2290HC
0.04-40
1500
Stainless
Yes
A2291HC
1.0-80
5000
Stainless
No
Parr high pressure burettes
can be furnished in various
sizes as shown in the adjoining
table, each with a regulator to
deliver gas to the reactor over
the designated pressure range.
The moles of gas shown in the
table represent the amount of
hydrogen that will be held in
the burette at the maximum
pressure. The deliverable vol-
ume will be a function of the
difference in pressure between
the pipette and the reactor.
The size of the burette selected
should be large enough to
provide sufficient gas to com-
plete the reaction while still
maintaining sufficient pressure
in the burette to force gas into
the reactor.
Reservoirs with larger
volumes are available as
are regulators with different
delivery ranges. Modifications
can be made to these basic
systems to add an internal
thermocouple to the reservoir
and/or a pressure transducer
for digital readout and/or
recording.
