Teledyne GFC-7000E - Trace CO2 Analyzer - Manual (Page 50)

Model GFC7000E Instruction Manual Optional Hardware and Software
04584 Rev A1 39
The state of the zero/span valves can also be controlled:
• Manually from the analyzer’s front panel by using the SIGNAL I/O controls located under
the DIAG Menu (Section 6.9.2),
• By activating the instrument’s AutoCal feature (Section 7.6),
• Remotely by using the external digital control inputs (Section 6.13.1.2 and Section 7.5.2),
or
• Remotely through the RS-232/485 serial I/O ports (see Appendix A-6 for the appropriate
commands).
FLOW / PRESSURE SAMPLE
SENSOR PCA PRESSURE
SENSOR
FLOW
SENSOR
INSTRUMENT CHASSIS
PUMP
SAMPLE CHAMBER
VENT SPAN
OUTLET
PRESSURE
SPAN INLET
IZS INLET
EXHAUST GAS
OUTLET
PURGE GAS
INLET
SAMPLE GAS
INLET
S
a
m
p
le
G
a
s
C
ri
tic
a
l
Fl
ow
O
rif
ic
e
GFC Wheel
Motor
GFC Motor
Heat Sync
GFC Wheel
Housing
Purge Gas
Pressure
Control Assy
PARTICULATE
FILTER
SHUT OFF
VALVE
1 2
SAMPLE /CAL
VALVE
3
2
1
Purge Gas
Flow Control
Orifice
ZERO/SPAN
VALVE
2
1
3
ex
te
rn
a
l C
O
2
S
c
ru
bbe
r
(O
pt 5
3
O
n
ly
)
Figure 5-2: Internal Pneumatic Flow – Zero/Span/Shutoff Valves OPT 50 & 51