Crate thermocouple

Thermocouple routines.

Provides a sense_temperature method to convert thermoelectric potential to temperature. The following thermocouple types are supported:

• Nickel-alloy thermocouples: Type E, J, K, N, T
• Platinum/rhodium-alloy thermocouples: Type B, R, S

This library includes newtype types, or wrapper types, to help with using the proper units when doing calculations. I investigated using a dimensional analysis crate such as uom or dimensioned instead of making my own newtype types. However after experimentation, I found this to be difficult to use and not at all lightweight.

The underlying storage type is either f64 (default) or f32. For the f64 storage type, the results from this crate match the NIST ITS-90 Thermocouple Database exactly.

Usage

Add this to your Cargo.toml:

[dependencies]
thermocouple = "0.1.3"

and this to your crate root:

extern crate thermocouple;

The temperature of a thermocouple can be calcuated from a voltage reading.

use thermocouple::{prelude::*, KType};

// Assuming reference junction at 25ºC
let temperature: Celsius = KType::new().sense_temperature(Millivolts(1.1));

The reference junction temperature can be set explicitly.

use thermocouple::{prelude::*, KType};

// Reference junction at 0ºC
let thermocouple =
   KType::new().with_reference_temperature(Celsius(0.0));

let temperature: Celsius =
   thermocouple.sense_temperature(Millivolts(2.0));

Tests

The tests check against every value provided in the NIST ITS-90 Thermocouple Database (DOI: http://dx.doi.org/10.18434/T4S888)

For a f64 base storage type, they should match the table exactly. Re-formatted versions of the tables for the automatic tests can be found in the nist directory.

Modules

prelude

A convenience wrapper to allow the user to import all the traits and structures required.

Structs

BType	Type B thermocouple (platinum/rhodium alloy)
Celsius	Unit of thermodynamic temperature
EType	Type E thermocouple (chromel-constantan)
Fahrenheit	Unit of thermodynamic temperature
JType	Type J thermocouple (iron-constantan)
KType	Type K thermocouple (chromel-alumel)
Kelvin	Unit of thermodynamic temperature, defined as the fraction of 1/273.16 of the thermodynamic temperature of the triple point of water
Millivolts	Unit of electric potential, 1/1000 of the SI Base Unit Volt
NType	Type N thermocouple (nicrosil-nisil)
RType	Type R thermocouple (platinum/rhodium alloy)
Rankine	Unit of thermodynamic temperature
Reaumur	Unit of thermodynamic temperature
SType	Type S thermocouple (platinum/rhodium alloy)
TType	Type T thermocouple (copper-constantan)

Traits

FPExt	Extension trait that adds convenience methods to the FP type
ThermocoupleCore	Trait for thermocouple functionality

Type Definitions

FP	Underlying storage type: f64