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Using Transfer Functions with 5B37 Products

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Overview

This document describes how to calculate the gain and offset values for 5B37 Series products.

Introduction
Basic Formulas
Values for All Standard 5B37 Products

Introduction

Because the 5B37 is not linearized, the transfer function applies only gain and offset as well as necessary cold-junction compensation (CJC) and open thermocouple (T/C) protection (upscale).

The CJC sensor compensates for the use of a thermocouple and negates the effects of parasitic thermocouples, so that the input can be modeled as a simple millivolt source.

Millivolt values corresponding to a valid temperature may then be found in the T/C standard EMF output tables available from NIST.

Basic Formulas

The basic formula for calculating any gain and offset of this series is calculated as follows:

V_out = Gain * (V_in - V_zero)

Remember to use the differential span for Vout and Vin. To find the differential span, use the following formula:

V_span = V_hi - V_lo

This formula applies for either inputs or outputs.

To find an output voltage for a given T/C and temperature, find the equivalent millivolt value and apply the following formula:

V_out = Gain * (V_in -V_zero)

To find an input temperature based on an output value use the following formula:

V_in = (V_out /Gain) + V_zero

This calculation yields the millivolt input, which you can then use to look up or calculate the corresponding input temperature.

Values for All Standard 5B37 Products

The following table shows the associated values for all standard 5B37 products.

	5B37 Model
		J-01	K-02	T-03	E-04	R-05	S-05	B-06
Temp (C)	low	-100	-100	-100	0	0	0	0
Range	high	760	1350	400	900	1750	1750	1800
Vout (V)	low	0	0	0	0	0	0	0
Range	high	5	5	5	5	5	5	5
Vin (mV)	low	-4.632	-3.553	-3.378	0	0	0	0
Range	high	42.922	54.125	20.869	68.783	20.878	18.504	13.585
Vin span		47.554	57.678	24.247	68.783	20.878	18.504	13.585
Gain (V/mV)		0.105143	0.086688	0.206211	0.072692	0.239486	0.270211	0.368052
Vzero (mV)		-4.632	-3.553	-3.378	0	0	0	0

For more information, contact Analog Devices at (617) 329-4700.

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