gas and liquid sampling device
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AC Liquefied Gas & Gas SamplingDevice
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AC Liquefied Gas & Gas Sampling Device
Hardware section
Page 2 of 13Version 2004/4.0
Introduction
The AC Liquefied and Gas Sampling Device is a sampling module that allows the user to
reproducibly introduce gaseous and liquefied (LPG) samples into a gas analyzer. A built-
in heated vaporizer vaporizes the liquefied samples, so they are introduced into the gas
chromatograph in the gaseous state. The unit is placed adjacent to the gas
chromatograph and connected to the gas sample loop(s) of the gas analyzer. It is
configured with a heated vaporizer, two rotameters, a selection valve and a clamp to
hold the sample bombs.
Partnumber Description
68100.000 Gas and Liquid Sampling Device excluding vaporizer
68100.001 Gas and Liquid Sampling Device including 110 V vaporizer
Options :
- low temperature (24-104C) *
- high temperature (104-194C) *
68100.002 Gas and Liquid Sampling Device including 220 V vaporizer
Options :
- low temperature (24-104C) *- high temperature (104-194C) *
* NOTE: Temperature adjustable inside the vaporizer, depending on the desired
temperature.
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Configuration
The sampling device is a separate unit configured with a heated vaporizer, a rotameter,
a clamp to hold the sample bombs, two selection valves and the necessary plumbing
material. The schematic overview can be found in figure 1.
Heated Vaporizer
to Gas SamplingValve GC
L
G
out
in
Gaseous Sample in
Liquefied Sample in
from Gas SamplingValve GC
Selection Valve
rotameter
Vent
Needle valve
Outlet pressureadjustment
2
10
4
3
7
1
5 6
8
9
Selection Valve13
13
12
A
B
Figure 1 Schematics
Principle
Both Liquefied and gaseous samples can be mounted on the device. With the Selection
Valve A, the proper position is chosen.
So for gaseous samples, position 3 (of selection valve A) is selected. The sample from
the sample bomb directly flows via Selection Valve A through the gas sample valve of
the gas chromatograph. It then goes through the rotameter to Vent. The effluent flow canbe adjusted with the needle valve (8) underneath the rotameter.
For Liquefied samples the Selection Valve A must be put in the Liquid position (4) and
selection valve B in position (12). So the liquefied sample is introduced in the Heated
Vaporizer. Here it is vaporized. The effluent gas goes to the gas sampling valve of the
gas chromatograph and finally again through the needle valve to vent. The effluent flow
should be adjusted with the outlet pressure adjustment (10), a special tool to adjust the
outlet pressure is delivered with the system.
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Configuration
Figure 2 Over view
1. Gas Sample In (male Swagelok 1/8)
2. Rotameter
3. Selection Valve A Position: Gas (3)
4. Selection Valve A Position: Liquid (4)
5. To Gas Sampling Valve Gas Chromatograph (male Swagelok 1/8)
6. From Gas Sampling Valve Gas Chromatograph (male Swagelok 1/8)7. Liquefied Sample in (male Swagelok 1/8)
8. Needle Valve Rotameter
9. Vent (male Swagelok 1/8)
10. Outlet pressure adjustment Heated vaporizer (5/32 Allen wrench)
11. Power supply
12. Selection Valve B Position: to GC (12)
13. Selection Valve B Position: to vent (13)
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Power supply Configuration
Figure 3 Front and Rear view
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Installation
The Sampling device must be placed adjacent to the gas chromatograph on the
lefthandside. The Gas sampling valve of the chromatograph must then be connected to
the Sampling device.
Using 1/16 Stainless steel capillary tubing, position 5 is connected to the Gas Sample
in from the gas chromatograph. Position 6 is connected to the Gas sample out from the
gas chromatograph.
It is recommended to connect a length of 1/8 tubing from the Vent position (9) on the
rear side of the device to a fume hood.
The power plug can be plugged in, this is the power supply of the heated vaporizer.
Please refer to figure 4 for the location of the temperature adjusting screw. This screw is
used to set the temperature of the heated vaporizer depending on the boiling point range
of the sample.
Figure 4 Wiring diagram
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Gaseous Samples
To inject gaseous samples, the gas sample bomb must be vertically mounted in the
clamp. The top outlet valve must be connected to the gas sample in (1) position on the
device and the selection valve A must be switched to the Gas position. (3)
Now with the needle valve of the rotameter (8) in the closed position (turned entirely
clockwise) the outlet valve of the sample bomb is opened. Then slowly the rotameter
needle valve is opened until a constant flow is obtained. (2 on scale corresponds with
about 30 mLs/minute)
The sample loop in the gas chromatograph is now being flushed. After one minute the
analysis can be started.
To obtain proper results, it is important to introduce and analyse samples and calibration
blends in the same way. Therefore if analysis is done whilst the sample loop is being
flushed, the flow through the gas sample loop must always be identical for sample and
calibration analyses.
If atmospheric injection is preferred, care must be taken to allow the same wait time after
the flow through the sample has been stopped for both sample and calibration runs.
(The stopwatch function of the GC display can be helpful in this)
Heated Vaporizer
L
out
inLiquefied Sample in
from Gas SamplingValve GC
Selection Valve
rotameter
Vent
Needle valve
Outlet pressureadjustment
2
10
4
7
6
8
9
Selection Valve13
13
12
A
B
to Gas SamplingValve GC
G
Gaseous Sample in
3
1
5
Figure 5 Flow path gaseous samples
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Liquefied Samples
To inject liquefied samples, the sample bomb must be mounted in the clamp, and the
bottom valve must be connected to the Liquefied Sample in position of the device*.
The selection valve A must be switched to the Liquid position. (4), selection valve B
must be in position (12).
The outlet pressure adjustment (10) can be adjusted with the special tool supplied with
the system.
Now with the outlet pressure adjustment (10) in the closed position and the needle valveof the rotameter (8) opened, the outlet valve of the sample bomb is opened. Then slowly
the outlet pressure adjustment (10) is opened until a steady flow (about 30 ml/minute) is
obtained. (2 on scale corresponds with about 30 ml /minute). The sample loop in the gas
chromatograph is now being flushed. Several minutes of time must be allowed to pass in
order to properly flush the vaporizer and to obtain a homogeneous sample.
Prior to analysis, selction valve B must be switched to position (13) in order to vent
excess sample. The pressure in the sample loop now becomes atmospheric.
To obtain proper results, it is important to introduce and analyse samples and calibrationblends in the same way. Therefore if analysis is done whilst the sample loop is being
flushed, the flow through the gas sample loop must always be identical for sample and
calibration analyses.
Please refer to figure 6.
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Heated Vaporizer
to Gas SamplingValve GC
L
G
out
in
Gaseous Sample in
Liquefied Sample in
from Gas SamplingValve GC
Selection Valve
rotameter
Vent
Needle valve
Outlet pressureadjustment
2
10
4
3
7
1
5 6
8
9
Selection Valve1312
A
B
Figure 6 Flow path liquefied samples
NOTE: A too high sample flow can be the cause of a not totally evaporated sample in
the sample loop.
NOTE: If the sample bomb is equipped with a diptube then the liquid out of the diptube
must be connected to the Liquefied Sample in position of the device!
NOTE: To vent excess sample, selection valve B must be switched to position (13).
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Heated Vaporizer
The heated vaporizer is built in to vaporize the liquefied samples. It consists of a heat
exchanger and a pressure control section. The liquefied sample enters the heated body,
where it is vaporized. The outlet pressure is controlled by a regulator (10) which can be
accessed at the back of the sampling device.
Figure 7 Heated vaporizer
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Part numbers:
28024.210 Heated Vaporizer (220V) 24 104 C
28024.220 Heated Vaporizer (220V) 104 194 C
28024.211 Heated Vaporizer (110V) 24 104 C
28124.221 Heated Vaporizer (110V) 104 194C
Standard Specifications
Body: Stainless steel
Model:/Port configuration: Side entry
Seat: Peek
Temp range: 75 F to 220 F (24 C to 104 C)
215 F to 380 F (104 C to 194 C)
Outlet range: 0-10 Psi
Power: 100 watt
Max pressure inlet: 2000 Psi
Typical applications are
Vaporize liquid hydrocarbons Ethylene, LPG, Butane. Natural gas sampling
Heated gas samples to prevent condensable drop out
Installation and Usage
Installation Vaporizer involves plumbing lines and electrical connection, use only
with AC applications.
Use instructions regarding connections as described below:
Allways check the connection for leaks.
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General mounting instructions
Disconnect power before servicing or replacement.
Plug in the power cord to the specified voltage.
Adjusting the proper temperature
Disconnect power.
Remove left cover from unit.
Open the vaporizer cylindrical cover plate to get access to the power cable.
Adjust the proper temperature setting. (position 1-6)