Teledyne M300EM User Manual

6.6.3.3. RNGE  MODE  AUTO: Configuring the M300E/EM Analyzer for AUTO Range Mode  

In AUTO range mode, the analyzer automatically switches the reporting range between two user-defined ranges 
(low and high).   

  The unit will switch from low range to high range when the CO

2

 concentration exceeds 98% of the low 

range span.   

  The unit will return from high range back to low range once both the CO

2

 concentration falls below 75% of 

the low range span. 

In AUTO Range Mode the instrument reports the same data in the same range on both the A1 and A2 outputs 
and automatically switches both outputs between ranges as described above.   

Also the RANGE test function displayed on the front panel will be replaced by two separate functions: 

RANGE1: The LOW range setting for all analog outputs. 
RANGE2: The HIGH range setting for all analog outputs. 

The high/low range status is also reported through the external, digital status bits (See Section 3.3.3).  

To set individual ranges press the following keystroke sequence. 

SETUP X.X       

 CFG DAS

CLK MORE

EXIT

SETUP X.X     

SET   UNIT  DIL

EXIT

SETUP X.X     

SNGL DUAL

 DIL

ENTR EXIT

SETUP X.X     

 SNGL DUAL AUTO

EXIT

SETUP X.X     

 MODE

  UNIT  DIL

EXIT

SETUP X.X     

Toggle these keys to 

select the upper 

limit for the 

reporting range.

 discards the new 

setting.

 accepts the 

new setting.

SETUP X.X     

The

 and

ranges have separate 

slopes and offsets for 

computing the CO 

concentration. 

The two ranges must 

be independently 

calibrated

.

Avoid accidentally setting the

range (

) of the instrument 

with a higher span limit than the 

 range (

).  

This will cause the unit to stay in 

the low reporting range perpetually 

and defeat the function of the 

 range mode. 

 

04288D DCN5752