Teledyne M300EM User Manual

3.3.2. ANALOG OUTPUT  CONNECTIONS 

The M300E is equipped with several analog output channels accessible through a connector on the back panel 
of the instrument.  The standard configuration for these outputs is mVDC.  An optional current loop output is 
available for each. 

When the instrument is in its default configuration, channels A1 and A2 output a signal that is proportional to the 
CO concentration of the sample gas.  Either can be used for connecting the analog output signal to a chart 
recorder or for interfacing with a datalogger. 

Output A3 is only used on the M300E/EM if the optional CO

2

 or O

2 

sensor is installed.   

Channel A4 is special.  It can be set by the user (see Section 7.4.6) to output any one of the parameters 
accessible through the <TST TST> keys of the units sample display. 

To access these signals attach a strip chart recorder and/or data-logger to the appropriate analog output 
connections on the rear panel of the analyzer.   

 

 

1 

V Out 

I Out + 

2 

A1 

Ground 

I Out - 

3 

V Out 

I Out + 

4 

A2 

Ground 

I Out - 

5 

V Out 

I Out + 

6 

A3  

(Only used if CO

2

  or 

O

2 

Sensor is 

installed) 

Ground 

I Out - 

7 

V Out 

I Out + 

8 

A4 

Ground 

I Out - 

 

3.3.3. CONNECTING THE STATUS OUTPUTS 

The status outputs report analyzer conditions via optically isolated NPN transistors, which sink up to 50 mA of 
DC current.  These outputs can be used interface with devices that accept logic-level digital inputs, such as 
Programmable Logic Controllers (PLCs).  Each status bit is an open collector output that can withstand up to 40 
VDC.  All of the emitters of these transistors are tied together and available at D. 

04288D DCN5752