Figure 3-16: Internal Pneumatic Flow - Ambient Zero/Ambient Span; Table 3-9: Ambient Zero/Ambient Span Valve Operating States - Teledyne T360 Operation Manual

Teledyne API Model T360/T360M Operation Manual
Figure 3-16:
Table 3-9:
07272B DCN6552
This valve option is intended for applications where zero air is supplied by a zero
air generator like a bottle of N
Calibrator like the Teledyne Instruments Model 700 or 702. Internal zero/span
and sample/cal valves control the flow of gas through the instrument, but because
the calibrator limits the flow of span gas no shutoff valve is required.
In order to ensure that span gas does not migrate backwards through the vent line
and alter the concentration of the span gas, a gas line not less than 2 meters in
length should be attached to the vent span outlet on the rear panel of the analyzer.
To prevent the buildup of back pressure, this vent line should not be greater than
10 meters in length.
Sample Gas
Flow Control
Internal Pneumatic Flow – Ambient Zero/Ambient Span
The following table describes the state of each valve during the analyzer's
various operational modes.
Ambient Zero/Ambient Span Valve Operating States
Mode Valve
Sample/Cal
SAMPLE
(Normal State)
Zero/Span
Sample/Cal
ZERO CAL
Zero/Span
Sample/Cal
SPAN CAL
Zero/Span
The minimum span gas flow rate required for this option is 800 cm
and span gas are being supplied by Gas Dilution
2
Sample / Cal
Valve
NO
NC
COM
COM
NC
NO
Zero / Span
Valve
SAMPLE
PRESSURE
SENSOR
O3 FLOW
SENSOR
Purge Gas
Pressure Control
Condition
Open to SAMPLE inlet
Open to IZS inlet
Open to ZERO/SPAN valve
Open to IZS inlet
Open to ZERO/SPAN valve
Open to PRESSURE SPAN inlet
Getting Started
3
/min.
49