Hach QC8500 Series 2, Руководство пользователя

Страница: 46 / 104

44
Operation
4.7.1 Injection valve connections
PORTS 1 AND 4— The tubing that connects these two ports is called the sample loop.
The length of the sample loop is specified in the method. Use 0.8 mm ID Teflon tubing for
the sample loop unless the QuikChem method specifies otherwise. Refer to
Figure 45 .
A sample loop may also be a Microloop, which consists of 12.5 cm or 16 cm of 0.3 mm ID
Teflon tubing.
Note: If the method does not specifically provide the length of the sample loop for the system
QuikChem FIA, add 5.5 cm to the length used with the manufacturer's system.
Example: The method does not specify the sample loop length for the system QuikChem
FIA but the manifold diagram provides information on a sample loop. If the sample loop
specified here is 10 cm, the system QuikChem FIA will need 15.5 cm of 0.8 mm Teflon
tubing between ports 1 and 4.
PORT 2— Connect the carrier line to port 2. Connect the carrier line to port 2 at the valve.
Use 30 cm of 0.8 mm ID Teflon tubing.
PORT 3— Connect 20 cm of 0.8 mm ID Teflon tubing between port 3 and the fitting on the
manifold labeled From Valve, unless specified differently in the method.
PORT 5— Connect 15 cm of 0.8 mm ID Teflon tubing between port 5 and the waste line.
When running two or more channels simultaneously, connect the 15 cm piece of tubing
from port 5 of the first valve to port 6 of the second valve. Connect port 5 to the waste line
in the last valve.
PORT 6— Connect a sample line to port 6. A sample line typically consists of:
• 130 cm length of Teflon tubing
• 20 cm length of Teflon tubing
• Two pump tube adapters (black collar)
• A green-green pump tube with both ends trimmed to leave 2 cm of tubing beyond the
green tabs
Figure 45 Input and output valve connection state
1 Sample loop 4 Waste line/next valve
2 Carrier line 5 Sample line/tubing from adjacent valve
3 To manifold