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154
Teledyne API – Model T400 O
3
Analyzer
083730400A DCN8130
•
On instruments with Zero/Span valve option (OPT-50A) the metal wool scrubber option
(OPT- 68) there is a DC heater embedded in the scrubber, which maintains it at a
constant 110ºC.
•
On instruments with the IZS valve option (OPT- 50G) there is a DC heater attached to the
IZS O
3
generator UV Lamp, which maintains it at a constant 48ºC.
Thermistor(s) –
Photometer Lamp
Temperature and Optional IZS O
3
Generator Lamp Temperature)
RELAY PCA
DC
Control
Logic
Preamplifiers
and Signal
Conditioning
MOTHERBOARD
A/D
Converter
(V/F)
CPU
Themocouple(s)
(used on Optional Metal
Wool Scrubber)
DC HEATERS
(UV LAMP Heaters)
THERMOCOUPLE
CONFIGURATION
JUMPER
(JP5)
Cold Junction
Compensation
Solid State
AC Relays
AC HEATER
(optional
Metal Wool Scrubber)
Figure 6-11: Heater Control Loop Block Diagram
6.3.3.4
VALVE CONTROL
The valve that switches the gas stream to and from the analyzer’s O
3
scrubber during the
measure/reference cycle is operated by an electronic switch located on the relay PCA.
This switch, under CPU control, supplies the +12VDC needed to activate each valve’s
solenoid.
Similar valves also controlled by the relay PCA are included in the following optional
components:
•
On instruments with the
ZERO/SPAN
valve option (OPT- 50A) there are two additional
valves:
•
The
ZERO/SPAN
valve selects which calibration gas inlet (the
ZERO
gas inlet or the
SPAN
Gas inlet) is the source of gas when the analyzer is in one of its calibration
modes.
•
The
SAMPLE/CAL
valve selects either the sample inlet when the analyzer is in
SAMPLE
mode or the calibration gas stream when the analyzer is in one of its
calibration modes.
•
On instruments with the
IZS
valve option (OPT- 50G) one additional valve (the
SAMPLE/CAL
valve) selects either the sample inlet when the analyzer is in
SAMPLE
mode or the dry air inlet when the analyzer is in one of its calibration modes.
Содержание T400
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