Products Mentioned

5B47 Obsolete
The 5B Series represents an innovative generation of low cost, high performance plug-in signal conditioners. Designed for industrial applications, these...
Datasheet
5B47 on Analog.com

Thread Details

  • State Verified Answer
  • Replies 2 replies
  • Subscribers 15 subscribers
  • Views 1398 views
  • Users 0 members are here
Options 

        

            Post
             Go back to editing
        

    

    


    

    









		


















	
	
			
	
			
		
	
	
		

	    
	    
	    		
Which Thermocouple type to use with 5B47 for -100C to 300C

		
	
				

			

									
					    seanengtxct
					
							

            
            			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Feb 15, 2016 
				
			
			
		
    
		
		                    	    
    
        	    
    Thread Summary
    
                The user is building an application to measure air temperatures between -100°C to 300°C using the 5B47 Isolated, Linearized Thermocouple Input. Despite the 5B47's highest accuracy with type J thermocouples, type J is not suitable for temperatures below 0°C due to condensation and rust concerns. Type T thermocouples are recommended for this temperature range, offering better low-temperature performance.
                        	    
    
                
                     AI Generated Content
                
    	    
    
             
				
        		
    
		    
		    		    
		    			
    
			    
    I am building an application to measure air temperatures between -100 deg C to 300 deg C.  I'm considering using the  5B47 Isolated, Linearized Thermocouple Input from AD.  The spec sheet for the 5B47 says that the highest accuracy for this temperature range is available from a type J thermocouple.  (+/- 0.5 deg C accuracy).  However, all the thermocouple manufacturers I have looked at say type J is not rated for temperatures below 0 deg C.  They all recommend type T thermocouples.  What am I missing?  Should I use type J or type T?
    
			
    
			
									
		                             
                        

    
    
                                            
                 interface and isolation
                
                                                    
                 thermocouple
                
                                                    
                 5b47
                
                                                    
                 300
                
                                                    
                 IOS Subsystems
                
                                        
                                            
                
                
                                        
                                            
                
                
                                
                    Show More
            
    
    
    
		
    

				
				        
        		
    
			
						
									
												
			
			
                        
                                    
                        
                        
                        
            
			            
						
						
			
			
			
			
		
    

        
        
        
    
					
    
			
    


    
















    
	
    
	
    
					



			


				
	









	
      
	

    • 
	
      



	
		
	
	



      
	
      
		
      
							
					
      
		
      
		    
		    		    
			
				
									
							        
			
			
			
      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Feb 16, 2016 5:36 PM
            
            
						
			            		
      
		
										0
					
	
      

		
		
      
		
      
                                
                                                            
      
					
      Hi seanengtxct,
      
 

      
 
      I'm not very familiar with the 5B47, but generally speaking, type J thermocouples are not used to measure temperatures below ambient due to concerns about condensation forming on the wires, which can cause the iron to rust. Type T thermocouples are good for cryogenic and laboratory applications where low temperatures are needed and the higher temperature range of type J is not needed. It sounds to me like type T would fit your measurement temp range very well, and personally I would choose type T despite the slightly lower accuracy of the module.
      
 

      
 
      Thanks,
      
 
      Scott
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
				
						
				
				
		
		
      
			
		
      
	
      

      

      • 

	

    • 
	
      



	
			
		
	



      
	
      
		
      
							
					
      
		
      
		    
		    		    
			
				
									
							        
			
			
			
        
            
						
                            
            
            				
            
                on Aug 2, 2018 11:22 AM
            
            
						
			            		
        
		
										0
					
	
        

		
		
        
		
        
                                
                                                            
        
					
        This question has been assumed as answered either offline via email or with a multi-part answer. This question has now been closed out. If you have an inquiry related to this topic please post a new question in the applicable product forum.

        Thank you,
        EZ Admin
        
			
        

		
			
	      

		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
				
						
						
				
				
		
		
        
			
		
        
	
        

        

        •