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M400E Ozone Analyzer Operator’s Manual Optional Hardware and Software
The state of the Sample/Cal valves can be controlled:
Manually via the analyzer’s front panel;
By activating the instrument’s AutoCal
feature (See Section 9.4);
Remotely by using the External Digital I/O Control Inputs (See Section 9.3), or;
Remotely via the RS-232/485 Serial I/O ports (See Section 8.1.7).
Table 5-2:
Internal Zero/Span Valve Operating States
Option Mode Valve Condition
Sample/Cal Valve Open to SAMPLE inlet
SAMPLE
Ozone Generator OFF
Sample/Cal Valve Open to Ozone Generator
ZERO
CAL
Ozone Generator OFF
Sample/Cal Valve Open to Ozone Generator
51A
SPAN
CAL
Ozone Generator ON at intensity level set by user
5.6.2.1. Disposable Charcoal O
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Filter
M400E’s equipped with IZS options have a disposable filter that is used by the instrument for creating zero air for
the auto-cal zero-point calibration. This filter is filled with activated charcoal and should last for approximately 1
year of continual usage. Call Teledyne Instruments customer service for replacement filters.
5.6.3. METAL WOOL SCRUBBER (OPT 68)
This option replaces the standard scrubber with a heated Metal Wool Scrubber that works similarly to the
catalytic converters found on many automobile’s exhaust systems and improves the analyzer’s performance in
certain higher humidity applications.
5.6.4. IZS DESICCANT (OPTION 56)
The M400E can be fitted with a desiccant dryer to provide a dry air source to the IZS sub-system. This option
consists of a rear panel mounted scrubber cartridge filled with anhydrous calcium sulfate (CaSO4) desiccant.
The desiccant material is expendable and must be replaced at regular intervals.
The material exhibits a color change when it has been saturated with water vapor, turning from blue to
pink.
The scrubber cartridge should be refilled before the entire scrubber turns pink.
Replacement interval will depend on how often the IZS is used, as well as ambient levels of humidity in
your application.
Initially the desiccant should be frequently monitored until a standard replacement interval can be
established.
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