User's Manual

M400E Ozone Analyzer Operator’s Manual Optional Hardware and Software

The instrument’s zero air and span gas flow rate required for this option is 800 cc/min, however, the US EPA

recommends that the cal gas flow rate be at least 1600 cc/min.

Table 5-1: Zero/Span Valve Operating States

Option Mode Valve Condition

Sample/Cal Open to SAMPLE inlet

SAMPLE

Zero/Span Open to ZERO AIR inlet

Sample/Cal Open to ZERO/SPAN Valve

ZERO CAL

Zero/Span Open to ZERO AIR inlet

Sample/Cal Open to ZERO/SPAN Valve

SPAN CAL

Zero/Span Open to SPAN GAS inlet

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 9.3.2.3), or;



Remotely via the RS-232/485 Serial I/O ports (See Section 8.1.7).

Cooling Fan

Power Receptacle

Sample Gas Inlet

Exhaust Gas

Outlet

Status Outputs

nalog Outputs

Control

Inputs

Serial I/O LEDs

COM Port

(RS-232 Only)

COM Port B

(RS-232 or RS-485)

DCE

–

DTE Switch Serial Number

Tag

Span Gas Inlet

Zero air Inlet

Figure 5-4: M400E Rear Panel Layout with Zero/Span Valve Option (OPT-50A)

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