2.15
2.9 Sample stream connection
WARNING
C Verify that connections are leak free at full operating pressure before
applying sample or calibration gases. These gases may be toxic or
asphyxiant.
C Consideration should be given to the toxicity and asphyxiant nature of
the sample gas when selecting a vent location.
The xentra 4900 is supplied with the internal transducers configured on either one or
two sample streams. Sample and calibration gases pass into and out of the chassis via
a gland plate mounted on the rear of the chassis. This gland plate will be provided in
one of the three following versions.
No autocalibration.
Internal autocalibration valve manifold.
External autocalibration manifold.
The sample gland plate without auto calibration (See Figure 2.8) provides up to four
sample inlets and a corresponding outlet for each inlet.
When optional internal auto calibration solenoid valves are used a valve manifold is
mounted in the sample gland plate (See Figure 2.9). This provides ports for sample
inlet and outlet, and inlets for two calibration gases. The internal autocalibration
manifold is only used with the single gas stream configuration.
When the external autocalibration option is used then an interface PCB and connector
(PL 8) are mounted on the sample gland plate (See Figure 2.10). This provides ports
for up to two sample inlets and a corresponding outlet for each inlet. The electrical
connector provides for two sets of voltage free relay contacts that may be used to
operate external sample valves. Connection details for the external electrical contacts
are given in section 2.8. The external autocalibration option is available for both the
single and dual sample stream configurations.
Sample gas connections are shown in Table 2.8.
Table 2.8 Sample ports
Inlet Outlet Cal. Gas
1
Cal. Gas
2
Standard F" NPT
female
¼" NPT
female
N/A N/A
With internal Auto
Calibration
F" NPT
female
¼" NPT
female
F" NPT
female
F" NPT
female
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