Emerson IM-106-5500 Manual Do Utilizador

IM-106-5500, Original Issue
August 2005

3-9

CCO 5500

Any of the four averaging stacks 
(seconds, minutes, hours or days) 
may be used for the analog output. 
They are selected by the ARROW 
keys and entered using the ENTER key. 

c. Output Units 

The analog output can represent the 
gas concentration in units of either 
mg/m

3

, mg/Nm

3

 or ppm. The ARROW 

keys will 'toggle' between these three 
options. Press the ENTER key to enter the new value. 

d. Output Span 

Select the required span using the 
ARROW keys for each digit. The 
ENTER key is pressed to enter the 
value of each digit. The units will be 
displayed as either ppm, mg/m

3

 or mg/Nm

3

, depending on what has 

been selected beforehand. The current value will be displayed for 1 
second when this option is entered. The display then defaults to 
zero; thus the span value must be re-entered for the unit to function 
correctly. 

e. Fault Indication 

Should a fault condition occur, the 
current output of the instrument may 
be set to any of the following options: 

• Set the output at 0 mA - ZERO. 
• Adjust the output to the calculated gas concentration even though 

a fault condition exists - MEAS. 

• Hold the last calculated gas concentration - HOLD. 
• Set the output to full scale (20 mA) - F.S. 

One of these options can be selected by pressing the ARROW keys; 
when the desired option is displayed press the ENTER key. 

f. Set mA Output 

NOTE
This is set at the factory and should not be altered without due consideration.

From this option the current levels of 
the analog output are set up. Press the 
ENTER key to select it, and the 
operator is prompted to set the current 
levels at 0 and 20 mA.

When this is displayed, the current output should be set to 0mA as 
measured with a calibrated current meter across the analog current 
loop terminals; nothing else should be connected to these terminals 
when the output is being set up.