Teledyne 200EH/EM

Optional Hardware and Software Teledyne API - Model 200EH/EM Operation Manual

Table 5-1: Zero/Span Valve States

MODE VALVE CONDITION

Sample/Cal Open to sample gas inlet

SAMPLE Zero/Span Open to zero air inlet

Sample/Cal Open to zero/span inlet (activated)

ZERO

CALIBRATION Zero/Span Open to zero air inlet

Sample/Cal Open to zero/span inlet (activated)

SPAN

CALIBRATION Zero/Span Open to span gas inlet / IZS gas (activated)

The state of the zero/span valves can also be controlled:

 Manually from the analyzer’s front panel by using the SIGNAL I/O controls located under the DIAG

Menu (Section 6.13.1),

 By activating the instrument’s AutoCal feature (Section 7.7),

 Remotely by using the external digital control inputs (Section 6.15.1.2) or Ethernet option.

 Remotely through the RS-232/485 serial I/O ports (Section 6-11).

All supply lines should be vented outside of the analyzer’s enclosure. In order to prevent back-diffusion and

pressure drop effects, these vent lines should be between 2 and 10 meters in length.

5.7.2. SECOND RANGE SPAN VALVE (OPT 52)

This option includes a special set of valves that allows two separate NOx mixtures to enter the analyzer from two

independent sources. Typically these two gas mixtures will come from two, separate, pressurized bottles of

certified calibration gas: one mixed to produce a NO, NO2 or NOx concentration equal to the expected span

calibration value for the application and the other mixed to produce a concentration at or near the midpoint of the

intended measurement range. Individual gas inlets, labeled HIGH SPAN and LOW SPAN are provided at the

back on the analyzer.

The valves allow the user to switch between the two sources via keys on the front panel or from a remote

location by way of either the analyzer’s digital control inputs or by sending commands over it’s serial I/O port(s).

NOTE

The analyzer’s software only allows the SLOPE and OFFSET to be calculated when

sample is being routed through the HIGH SPAN inlet.

The LOW SPAN gas is for midpoint reference checks only.

The state of the optional valves can be controlled:

 Manually from the analyzer’s front panel by using the SIGNAL I/O controls located under the DIAG

Menu (Section 6-13.1),

 By activating the instrument’s CAL or AutoCal features (Section 7.7),

 Remotely by using the external digital control inputs (Section 6.15.1.2) or Ethernet option.

 Remotely through the RS-232/485 serial I/O ports (Section 6.11).

04521C (DCN5731)