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150
Teledyne API – Model T400 O
3
Analyzer
083730400A DCN8130
S
AMPLE
T
EMPERATURE
S
ENSOR
The source of this signal is a thermistor attached to the absorption tube inside the sample
chamber of the optical bench assembly. It measures the temperature of the sample gas in
the chamber. This data is used to during the calculation of the O
3
concentration value.
UV
L
AMP
T
EMPERATURE
S
ENSOR
This thermistor is attached to the UV lamp in the optical bench and reports the current
temperature of that lamp to the CPU as part of the lamp heater control loop.
IZS
O
PTION
L
AMP
T
EMPERATURE
S
ENSOR
This thermistor is attached to the UV lamp of the O
3
generator in the IZS option, and
reports the current temperature of that lamp to the CPU as part of a control loop that
keeps the lamp temerpature constant.
B
OX
T
EMPERATURE
S
ENSOR
A thermistor is attached to the motherboard. It measures the analyzer’s internal
temperature. This information is stored by the CPU and can be viewed in the Dashboard.
6.3.2.4
ANALOG OUTPUTS
The analyzer comes equipped with four analog outputs:
A1
,
A2
,
A3
and
A4
. The type of
data and electronic performance of these outputs are configurable by the user (see
Section 2.5.8).
O
UTPUT
L
OOP
-
BACK
The analog outputs are connected back to the A/D converter through a loop-back circuit.
This permits the voltage outputs to be calibrated by the CPU without need for any
additional tools or fixtures.
6.3.2.5
EXTERNAL DIGITAL I/O
This External Digital I/O performs two functions: status outputs and control inputs.
S
TATUS
O
UTPUTS
Logic-Level voltages are output through an optically isolated 8-pin connector (labeled
STATUS) located on the rear panel of the analyzer. These outputs convey good/bad and
on/off information about certain analyzer conditions. They can be used to interface with
certain types of programmable devices (See Section 2.3.1.3).
C
ONTROL
I
NPUTS
By ap5VDC power supplied from an external source such as a PLC or Data
logger (See Section 2.3.1.5), Zero and Span calibrations can be initiated remotely by
contact closures (labeled CONTROL IN) on the rear panel.
6.3.2.6
POWER UP CIRCUIT
This circuit monitors the +5V power supply during start-up and sets the analog outputs,
external digital I/O ports, and I
2
C circuitry to specific values until the CPU boots and the
instrument software can establish control.
Содержание T400
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