Campbell Scientific TGA100 Trace Gas Analyzer Manual - Manual (Page 24)

3) Connect the sample intake to the sample gas inlet. The sample intake should be filtered to remove particulates (10
µm maximum pore size) and should have an appropriate needle valve or fixed orifice to control the sample gas
flow and pressure.
4) Connect power. For older units, connect a user-supplied, regulated 12 Vdc supply with at least 5 ampere capacity
to the system enclosure POWER IN connector. Use the supplied external cable (CSI PN 7987) with the red wire
connected to +12 volts and the black wire to ground return. Newer units are supplied with an internal, universal-
input power supply. Connect the power supply to AC power (100-240 Vac, 47-63 Hz, 1.6 A). The use of an
appropriate surge protector is highly recommended. However, unless the entire system can be powered from an
uninterruptible power supply (UPS), including the sample pump, this electronics power supply should not be
connected to a UPS. This will allow the system to initiate an automatic restart if power is temporarily interrupted.
5) For newer units equipped with a TGAHEAT temperature controller, set the temperature by inserting a small
screwdriver into the Temperature Setting hole in the TGAHEAT module in the analyzer electronics. Rotate the
screw to the desired temperature (10 to 50 °C). Connect its power supply to AC power (85-132 Vac, 3.2 A, or 170-
264 Vac, 1.8 A, at 47-63 Hz). The use of an appropriate surge protector and a UPS is highly recommended, to
help the automatic restart sequence find the correct absorption line when power is restored.
6) For isotope ratio applications, the short sample cell and the air gap between the dewar and lens and the short
sample cell should be purged to prevent absorption by ambient air, as discussed in section 4.1.4.
More details on configuring the TGA100 to measure a specific trace gas can be found in section 4.1.
2.2 TGA100 PC Installation
The TGA100 includes a standard desktop personal computer (PC) to provide the user interface; controlling the
analyzer, and calculating, displaying, and storing data in real time. The TGA PC must be protected from the weather.
The TGA PC may be located up to 1650 ft. (500 m) from the TGA100 analyzer, determined by the length of the fiber
optic interconnect cable. To install the TGA PC:
1) Connect the monitor, keyboard, and mouse (if applicable) to the TGA100 PC.
2) Connect the PC and monitor to AC power. The PC and monitor should operate with any AC power (115/230 Vac,
50/60 Hz). However, if this is an initial installation, check the voltage selector on the PC for proper setting
(115/230 Vac). The use of an appropriate surge protector and uninterruptible power supply (UPS) is highly
recommended for the PC. The monitor should be powered with a surge suppressor only.
3) Use the fiber optic cable (CSI PN 7737) to connect the analyzer to the link adapter card in the TGA PC.
4) Connect the link adapter card in the TGA PC to the transputer card in the PC. There are two versions of the
transputer card, with a different style connector and cable.
a) For older TGA100s, connect the 18-inch cable with one 8-pin mini-din connector and one RJ45 telephone-
type connector (CSI PN 10699) between the link adapter board and the third (center) connector on the PC
transputer board. Connect the cable with two 8-pin mini-din connectors (CSI PN 7917) between the two
adjacent connectors on the transputer which are farthest from the PC’s mother board, as shown in Figure 2-2.
Fiber optic
out to TGA
T
L
IN
K
O
U
T
IN
Transputer
Board
Link Adapter
Single Stand-Alone System
Figure 2-2. Link Adapter Cable Connections
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