Thermocouple Wire Colour Coding

A Quick Guide to Thermocouple Wire Colour Coding

What are Thermocouple Colour Codes?

There are numerous different thermocouples in the market. To be able to identify them, they are assigned different colours. However, not everyone has an easy time differentiating the different thermocouples. The main reason for this is because there are different colour code systems. It is essential to know the origin of a particular device when applying thermocouples to use the right colour codes.

The old standard thermocouple colour code that was commonly used in the UK and Europe is the IEC colour code. BS EN 60584 is the current standard of colour code commonly used in the UK and Europe. Even though it is rare, you may also come across the American ANSI colour coding in the UK and Europe.

If you have trouble differentiating different types of thermocouples, worry no more because the purpose of this article is to help you out.

Thermocouples and Their Working Principle

Thermocouples are devices used for measuring temperatures. Due to their robust nature, thermocouples are capable of measuring a wide temperature range. However, the range varies from one type of thermocouple to the other.

Thermocouples wires have polarity because of the Seebeck effect that needs one to connect to the correct terminals. When connecting a thermocouple leads to an electrical circuit, a sensor, which to be specific is a voltmeter, is connected to one of the conductors. Changes in temperatures cause voltage differences that can be measure using a thermocouple.

IEC Thermocouple Colour Codes

Thermocouple colour coding confuses a lot of people, even though it may seem straightforward. This article can help you correctly identify thermocouple types. You will gain knowledge on thermocouples applications, including:

  • Controllers
  • Transmitter
  • Transducers
  • Thermistors

Thermocouples types are assigned single letters: J, K, T, N, E, and R/S. Every thermocouple type has its unique colour for identification purposes. Type J and K are the most common thermocouples in the plastics industry.


K Type Thermocouple

The jacket and connector housing of this thermocouple is green. The positive lead is a non-magnetic nickel-chromium (NiCr) alloy with green insulation, while the negative magnetic lead is an alloy of nickel and aluminium (NiAl) with white insulation. Type K thermocouples are widely known for being accurate and reliable. Also, Type K thermocouples are capable of measuring temperatures of up to 1100⁰C.

J Type Thermocouple

Type J thermocouples have black jacket and connector housing. The positive lead has black insulation, while the negative lead has white insulation. The positive lead is iron (Fe); therefore, it is magnetic, while the negative lead is a non-magnetic copper-nickel alloy (CuNi). Even though Type J thermocouples are common, they cannot compare to Type K thermocouples when it comes to temperature range. The temperature range of type J thermocouples is 0 to 600⁰C. However, the cost pretty the same. Class 1 accuracy for Type K and Type J thermocouples have the same accuracy for temperature ranges of -40 to +375°C, which is ±1.5°C. As for class 2, the tolerance is wider.

T Type Thermocouple

It has a brown jacket and connector housing. The lead with brown insulation is the positive one, while the negative lead has white insulation. The positive lead is copper (Cu), while the negative lead is CuNi. Both leads are non-magnetic.

N Type Thermocouple

Both the jacket and thermocouple connector housing are pink. The NiCr positive lead insulation is pink, and for the nickel-silicon (NiSi) negative lead is white.

E Type Thermocouple

The positive leg has purple insulation, while the negative leg has white insulation. As for the jacket and connector housing, they are purple. The positive lead is NiCr, and the negative lead is CuNi, which ate both non-magnetic.

R / S Type Thermocouple

The jacket and connector housing are orange. The positive lead has orange insulation, while the insulation colour of the negative lead is white.

The accuracy of thermocouples is not affected by the length of the thermocouple wiring. This is because the voltage drops used to get temperature measurements are low. However, it is essential to shield and ground sensors at one end to prevent electrical noise if the distance between a thermocouple and the instrument is large.

If you want to learn more about thermocouples, you can visit

Measuring temperatures

Thermocouples are used for measuring temperatures. Some types of thermocouples can measure temperatures of up to 2000⁰C. The main parts of a thermocouple are the jacket, connector housing, positive leg, and negative leg.

Thermocouples are assigned different colour codes so that people can differentiate them. However, different countries use different colour code systems, making it difficult for some people to identify the thermocouple type they are using. The International standard thermocouple colour code used is the IEC 60584-3.

Penetration Testing

The Single Most Important Thing You Need to Know About Penetration Testing

With new and sophisticated technology comes evermore complicated cyber-attacks.

Human error and inefficient controls can easily reveal the most complex system to security vulnerabilities, which may go unnoticed for some time.

Therefore, it would be advisable to invest in penetration testing if you want to remain proactive against the potential threat of a cyber-attack. Organizations such as can help simulate the threats posed to your company and identify how secure and prepared your systems are.

Although there’s no single security system that’s assured to be impassable, penetration testing needs to be your most important step towards beefing up your system security. Read on to learn more about its importance.

What’s Penetration Testing?

Also known as pen testing, penetration testing is a simulated cyberattack against a company’s system or software to identify their strengths and vulnerabilities.

It is essential to recognize that penetration testing is different from the vulnerability assessment. While the pen test looks for weaknesses in a system or network, vulnerability assessment looks for the known weaknesses.

The good thing about a pen test is that it lets you identify whether the present defensive mechanisms used on the network are sufficiently strong to solve the prospective security breaches.

The Best Pen Test Procedures

Pen testers use several tactics or even a mixture of methodologies when performing penetration testing. Your objectives determine the best methodology to use.

Internal Testing

The internal testing is done from a user account and then presented to the tester. With this info, the tester will simulate an attack using a malicious insider to identify whether it’s possible to access or even take action against unauthorized resources. Basically, the method tests the rogue of internal staff.

External Testing

It tests the organizational assets visible to the outsiders via a network. Well, these include DNS (domain name servers), email, company websites, FTP servers, exploitable devices or even the web application itself.

Blind Testing

It’s quite similar to the external testing only that it’s offered with the randomly targeted company’s name. However, it needs extra time to collect info from posing as an ordinary external tester.

The Double-blind Testing

It is a special pen test because the tester and client company work blindly. Yes, the company’s IT specialists are uninformed of the simulated attack, and only a handful of individuals on the customer side are well-informed of the procedure.

Different Stages of Penetration Testing

Pen test has five stages. Here are the stages:

Planning and Reconnaissance

It is the first stage and involves identifying the test’s goal and scope. It’s then followed by collecting the first data plus intelligence on your target to make it easier for you to recognize how the target functions.


Here, the tester analyses how the target system manages various attack efforts. It is available in two forms, the static analysis and dynamic analysis.

Static analysis – it entails assessing the application’s code to forecast how it performs during runtime.
Dynamic analysis – it involves inspecting app’s code as it runs. It offers real-time awareness into how the app operates.

Gaining Access

During this stage, the tester tries to gain entry to discover the company target susceptibilities, such as cross-site and backdoor script. Basically, the tester searches for the network’s vulnerabilities by intercepting traffic, escalating privileges or even stealing data.

Maintaining Access

In this stage, the tester will assess whether it’s possible to exploit the identified weakness though system manipulation.


The last stage involves the testers trying to conceal their tracks by eradicating any possible detection. The tester will collect the penetration result attempts into a report and then assess the vulnerabilities.

The Benefits of Carrying Out a Pen Test

A pen test’s main goal is to ensure vital data is secure and safe against unauthorized malicious attacks. The pen testers need to assess the technical weaknesses, design flaws, plus other exposures to strengthen software efficiently.

Another goal is to recognize security exposures in a network, system or any other technical infrastructure. Afterwards, the security specialists utilize the collected info to eradicate the susceptibilities before cyber attackers can take advantage of them.

Here is a simple breakdown of pen test pros:

  • It assists in identifying the type of attack that may attack a software.
  • It reveals the weaknesses that could arise due to the mixture of multiple low-risk weaknesses.
  • It assists in identifying the point of weaknesses.
  • It tells the strength and weaknesses of security software.
  • It shows the ideal influence of successful attacks on the company’s general operations.
  • It lets you design a much more effective response and disaster recovery plans that make it easy for you to lower the downtime should you encounter a security breach.
  • A third party will give you a set of neutral and unbiased recommendations.

The Final Take

As a company, you don’t necessarily have to understand the terms described above deeply. For this reason, it would be wise to outsource external specialists. However, you have to remember that your company could be at risk, regardless of its type and size.

All companies are a target for a prospective data breach, ransomware or malware, system hacks or other typical attacks. As said earlier, a pen test will identify the weaknesses in your security mechanisms and suggest the preventative actions you need to undertake.

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