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Teledyne API - Model T200H/T200M Operation Manual
Getting Started
49
3.5.3.1. Ambient Zero/Ambient Span Valves (OPT 50A)
The Model T200H/M NO
x
analyzer can be equipped with a zero/span valve option for
controlling the flow of calibration gases generated from external sources. This option
contains two solenoid valves located inside the analyzer that allow the user to switch
either zero, span or sample gas to the instrument’s sensor.
The user can control these valves from the front panel keyboard either manually or by
activating the instrument’s CAL or AutoCal features (Section 5.8). The valves may also
be opened and closed remotely through the serial ports (Section 4.11) or through the
external, digital control inputs (Section 4.15).
This option also includes a two-stage, external zero air scrubber assembly that removes
all NO and NO
2
from the zero air source (ambient air). The scrubber is filled with 50%
Purafil Chemisorbant
®
(for conversion of NO to NO
2
) and 50% activated charcoal (for
removal of NO
2
). This assembly also includes a small particle filter to prevent scrubber
particles from entering the analyzer, as well as two more rear panel fittings so each gas
can enter the analyzer separately.
Figure 3-19 and Figure 3-20 show the internal, pneumatic layouts with the zero/span
valve option installed for a Model T200H and T200M respectively.
VACUUM
PRESS URE
SENSO R
SAMPL E
PRESS URE
SENSO R
O
3
FL
O
W
SEN
SO
R
FLOW PRESSURE
SENSOR PCA
INSTRUMENT CHASSIS
OZONE DRYER
NO/NO
X
VALVE
AUTOZERO
VALVE
O
3
Destruct
O
3
GENERATOR
EXHAUST
GAS
OUTLET
Fil
te
r
SAMPLE
GAS
INLET
ZERO GAS
INLET
SPAN GAS
INLET
SAMPLE/ CAL
VALVE
ZERO/SPAN
VALVE
Orifice Dia.
0.004"
PUMP
NO
X
E
xh
au
st
S
c
ru
b
b
e
r
Orifice Dia.
0.003"
Orifice Dia.
0.007"
REACTION
CELL
PMT
Orifice Dia.
0.007"
EXH
AU
ST
MAN
IF
O
L
D
NC
COM
NO
NC
COM
NO
NC
COM
NO
NC
COM
NO
Zero/Span Valve Option
NO
2
Converter
Figure 3-19:
T200H – Internal Pneumatics with Ambient Zero-Span Valve Option 50A
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Содержание T200H
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