Optional Hardware and Software Model 200E Instruction Manual
Figure 5-1: Current Loop Option Installed on the Motherboard
5.4. Particulate Filter Kit (Option 42A)
This option includes a one-year supply of 50 replacement, Teflon membrane, particulate
filters, 47 mm in diameter, 1 micrometer pore size.
5.5. Calibration Valve Options
5.5.1. Zero/Span Valves (Option 50)
The Model 200E 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 7.8). The valves may also be opened and closed remotely through the serial ports
(Section 6.9) or through the external, digital control inputs (Section 6.8).
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 to
enter the analyzer as well as two more rear panel fittings so each gas can enter the
analyzer separately.
Figure 3-12 shows the internal, pneumatic connections for a Model 200E with the zero/span
valve option installed. Table 5-1 describes the state of each valve during the analyzer’s
various operational modes.
34 044100102 Rev A
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