Campbell CPEC300, Руководство по эксплуатации продукта, Страница: 37 / 175

CPEC300/306/310 Closed-Path Eddy-Covariance Systems
28
span the EC155, a 1/4-in OD tubing that has been swaged on both ends is used
to connect the EC155 to the valve module. A CO
2
cylinder and either a Zero
gas (ultra-pure nitrogen) cylinder or scrub module are connected to the valve
module for zero and spanning. More information on zero and span procedures
can be found in Section 7 ,
Zero and Span
(p. 80)
.
FIGURE 5-5. Plumbing for CPEC310 with optional scrub module
5.2.1 Pump Module
For the CPEC300 connect the EC155 to the pump module as shown in
FIGURE 5-3 . If the EC155 is within 15 m (50 ft) of the pump module, 3/8-in
OD tubing is recommended. For longer distances, up to 150 m (500 ft), a 1/2-in
OD tube minimizes pressure drop in the tube.
The fittings on the EC155 and the pump module are sized for
3/8-in OD tubing. A reducer is required at each end for the larger
tubing size. Campbell Scientific supplies pre-swaged pump tube
assemblies with reducers at each end for this purpose.
Connect one end of the pump tube to the last fitting of the vortex assembly
which is connected to the port labeled Pump on the back of the EC155
analyzer. Connect the other end to the fitting labeled Inlet on the CPEC300
pump module as shown in FIGURE 5-3 .
5.2.2 Zero/Span with the CPEC310
The CPEC310 can perform automated zero (CO
2
and H
2
O) and CO
2
span of
the EC155. The user must supply cylinders of zero air and CO
2
span gas with
appropriate regulators. If the user has chosen the optional CPEC310 scrub
module, then no cylinder of zero air is required.
The rest of this section assumes the use of cylinders of compressed gas, but see
Appendix K ,
CPEC310 Scrub Module Installation, Operation, and
Maintenance
(p. K-1)
, for details on the scrub module.
NOTE