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Table 2-6. Valve States with Optional O
GAS TYPE
Generate
Source Gas
Generate O
Leak Check
0-17%
Leak Check
17%-100%
GPT
GPTZ
GPTPS
STANDBY
Only present if multiple cal gas MFC option is installed.
1
2
In an instrument with multiple MFCs the CPU chooses which MFC to use depending on the target gas flow requested.
3
When generating O
Flow rates are controlled by critical flow orifice(s) located in the gas stream
In addition to the connections discussed in the previous sections, this option also requires
the following:
•
•
See Figure 2-4. Internal Layout for the location of these fixtures.
Note
44
VALVES
(X = Closed; O = Open)
(D = Deenergized; E = Energized)
CYL
DILUENT
GPT
IN
IN
O
O
D
X
O
D
3
X
O
D
X
X
D
O
O
E
O
O
E
X
O
D
X
O
D
or in GPT Pre-Set mode, the photometer pump is the primary creator of gas flow through the T750.
3
Loop back lines must be connected between:
PHOTOMETER OUTLET fixture and the PHOTOMETER INLET fixture.
PHOTOMETER ZERO OUT fixture and the PHOTOMETER ZERO IN
fixture.
An O
exhaust line must be connected to the EXHAUST outlet.
3
• The EXHAUST line must be vented to atmospheric pressure
using maximum of 10 meters of ¼" PTFE tubing.
• Venting must be outside the shelter or immediate area
surrounding the instrument.
Generator and Photometer (Options in T750)
3
O
3
PHOT M/R
CAL
GEN
D
ON
3
Reference Phase
E
OFF
Switching
D
ON
D
ON
E
ON
2
Reference Phase
E
ON
Reference Phase
E
OFF
Switching
D
OFF
Reference Phase
PHOT
MFCs
PUMP
CAL2
1
DILUENT
ON
2
ON
OFF
OFF
OFF
ON
3
ON
ON
ON
ON
ON
2
ON
OFF
ON
ON
OFF
OFF
ON
ON
3
OFF
OFF
OFF
083730750B DCN8606
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Troubleshooting
