MeshGuard LEL IR & CO2 IR User’s Guide 
 
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5.9.7.   Change SPAN value 
 “Set” and “go” flash in alternation, and “SPAN” and a gas cylinder icon are shown. 
     
Press [Y/+] to enter and change the setting, [MODE] to exit and return to Detection Mode, or [N/-] to 
advance to the next menu. 
The LCD displays the current value. Change the value if necessary. (LEL value is shown here.) 
 
To change the value: 
1.  Press  [Y/+] to increase the number and [N/-] to decrease it. 
2.  Press [MODE] to advance to the next digit. 
3.  After moving to the last digit and making changes, press [MODE]. A question mark (?) is 
shown in the display, asking if you want to save the change. 
•  Press [Y/+] for yes. The message “dn” means the change is done. 
•  Press [N/-] for no. A “no” message means that the change was abandoned. 
•  Press [MODE] to return to the first digit.