Harsh Environment & Design Consideration


July 20, 2022

The use of sophisticated electronic and sensing devices to improve and expand manufacturing, machining, and production processes in industrial applications is only possible if all components survive the difficult environment. Systems must endure hot, humid, and harsh conditions and destructive electric and magnetic fields.

The specific environmental conditions in which a product is used affects its specifications. Such specifications must be determined at the beginning. Difficult conditions in industrial applications include particulate ingress, extreme temperature, physical impact, Electrostatic Discharge (ESD), Electromagnetic Interference (EMI), and vibration. All these conditions, if unchecked, will destroy electronic equipment over time. This article discusses critical design considerations in a harsh industrial environment.

Harsh Temperature and Semiconductor Thermal Consideration

High temperatures are a major contributor to a punishing environment. A cool climate is a necessity for effective electronic device operational performance. The microclimate inside the automobile hood is a toxic one where the ambient temperature rarely drops below 125 C. Combustion and exhaust gas sensors must work in heated, harsh environments. High-temperature electronics must make up the control circuitry administering the actuators and sensors.

When used in high-temperature environments, electronics must have active or passive cooling to keep parts within their respective operating temperature ranges. This is impractical in most real-world situations. Semiconductor (IC) robustness includes operating temperature range, fault protection, managing high electrical noise, and ESD. Robustness is a crucial performance factor for an extended operation and obtains a reputable, reliable final product. Durability is a must in an industrial ecosystem characterized by extreme operating conditions, with IC temperatures swinging anywhere between -40°C to +85°C. Elevated temperature operation is here to stay, and the automotive industry may eventually witness working temperatures between -40°C to +125°C.

Thermal issues crop up when electronic devices are kept in an air-tight industrial indoor environment. The devices dissipate heat, and rising temperatures will damage devices if improperly managed. Voltage regulators and power ICs use thermal shutdowns to prevent such a scenario. Choosing packages with super low thermal impedances help to transfer heat away from the device. The addition of aluminum heat pipes or heat sinks to the concerned case offers a lower thermal impedance path to air. This reduces operating temperature, greatly improving its longer-term reliability.

Managing Voltage Transients

Incorrect wiring or accidental shorts make voltage transients on power-supply lines. These transients can damage downstream circuitry if the inputs remain unprotected. A simple and discreet circuit consisting of a series fuse with a Transient-Voltage Suppressor (TVS) diode or Zener diode, or Metal Oxide Varistors (MOV) is generally used to protect against most voltage transients.


A more controlled approach to managing overvoltage and transient events is to integrate the reaction circuitry and protection threshold into an IC. Internal diodes and comparators are designed into multiple protection and supervisory ICs to ensure a definitive response every time. A few ICs include high-voltage fault safeguards for data lines. A fault-safeguard device latches on when normal data-line voltage levels are exceeded to shield itself from damage. A good example is the MAX4708 multiplexer family. For more information on transient voltage suppressor products, click here.

Intrinsic Safety Consideration

Intrinsic safety refers to a designed explosion protection method shielding the electrical circuit. Intrinsically safe systems restrict energy even when there are multiple failure conditions. These barriers are employed to restrict the energy discharged if a component or wiring fails. The aim is to stop ignition. A few recommendations for intrinsic safety design are described in the following content.

Batteries used must be sufficiently robust to survive anticipated environmental conditions. There should be minimal electrolyte leakage, which can happen during severe short-circuit environments.

Energy-storing parts like capacitors, inductors, and ferrite beads can be vulnerable to compliance with spark-ignition parameters. The stored available energy in them must be restricted so that there is insufficient energy to ignite an explosive atmosphere. Encapsulation is used to shield circuits against any chances of spark ignition.

Conformal Coatings

Conformal coatings are essential to enhance the long-term performance and reliability of electronic assemblies. The product offers enhanced protection against dust, shock, vibration, chemicals, dirt, abrasion, fungus, moisture, and mechanical stress. Conformal coatings include: one part UV curing formulations, one and two-part silicones, one and two-part epoxies, and a specialized, cost-effective latex system. To learn more about safety tips in harsh industrial environments, download the e-book The Ultimate Guide to Harsh Environment Ratings & Design.

Ingress Protection (IP) and NEMA Ratings

A sealed enclosure is used to prevent the ingress of water or dust. The sealed-off volume of space is used to safe-house electronics within harsh environments. The contextual standard is IEC 60529, as defined by the International Electrotechnical Commission (IEC). This standard designates the number of types and degrees of protection afforded by an enclosure to its electrical equipment. The IP code itself bears the form “IP XY,” where the digits X and Y denote protection from particle ingress and water, respectively. They are commonly used for applications exposed to the elements, along with dust or moisture. Typical user industries include marine, offshore oil and gas platforms, security, lighting, leisure, and food processing.

The National Electrical Manufacturers Association (NEMA) offers a popular protective enclosures standard similar to IP Code (IEC 60529). The NEMA 250 covers a wider sweep of harsh conditions than the IP code. It also includes ratings, both hazardous and nonhazardous, for indoor and outdoor locations. Such conditions include the ingress of foreign objects (like dust or fibers), water, and corrosive agents, including various gases and atmospheres. AE1360 is an example of IP66, NEMA 4 metal enclosure for electrical use in a harsh industrial environment. For more information on IP and NEMA rating products, click here.


Considerations for Connectors

Designers must take into account multiple factors like the influence of temperature, solvents, icing, salt exposure, moisture, corrosion, and fungus during a connectors’ selection. A wrong choice can affect the integrity, performance, and lifespan of the application. A few factors must be considered when selecting connectors for harsh environments.

Communication Protocols is a key consideration for the communication application. Connectors carry different signals like RS232 or I2C serial interfaces, RF transmissions, audio and video signals, power, or high-speed data communications. The level of data rates and characteristics should be taken into account. When it comes to power needs, the designer should check the voltage and current requirements.

Space requirements are exacting in the era of miniaturization. All modern applications continue to switch to chips and technologies that provide advanced functionalities within small form factors. Design engineers should be careful to opt for connectors as per demand.

Termination Style is another consideration. Harsh environment connectors provide metallic sealing along with an electrical connection. This electrical connection is achieved by soldering the connector directly to the board or through a cable termination. Connectors must shield components from all Electromagnetic Interference (EMI) radiations. This radiation may either pass into the box and hinder the device’s functionality or exit the box and interfere with other devices. A few specially chosen connectors fitted with a conductive gasket and plated metal shells ensure optimum EMI performance in harsh environments.


MRD series connectors are an excellent example of industrial harsh environment connectors, available in 2, 3, and 4 position form factors. Housing options include all plastic constructions as well as metal locking bodies for greater durability. Panel mount and cable termination options are available with or without finger-proof protection. They are IP67 water/dustproof and meet environmental, health and safety requirements. For more information on connector products, click here.


Related Articles

Changing Scene

  • Tri-Mach Announces the Purchase of an Additional 45,000 sq ft. Facility

    Tri-Mach Announces the Purchase of an Additional 45,000 sq ft. Facility

    Recently, Tri-Mach Inc. was thrilled to announce the addition of a new 45,000 sq ft. facility. Located at 285 Union St., Elmira, ON, this facility expands Tri-Mach’s capabilities, allowing them to better serve the growing needs of their customers. Positioning for growth, this additional facility will allow Tri-Mach to continue taking on large-scale projects, enhance product performance testing, and provide equipment storage for their customers. Read More…

  • HELUKABEL Group Builds New Facility for Automation Cable Solutions

    HELUKABEL Group Builds New Facility for Automation Cable Solutions

    The HELUKABEL Group recently announced it is going to build a new facility in Haan, Germany that will house its robotic dress pack and drag chain system subsidiaries under one roof. The new building will also serve as the headquarters of HELUKABEL’s Rhine-Ruhr sales branch, and is planned to be completed by 2025. Robotec Systems’ core business is robotic dress pack solutions and has been a HELUKABEL subsidiary since 2012 operating out of Duisburg, a suburb of Duesseldorf in northwest Germany. Read More…

Sponsored Content
Fire Protection for Lithium-ion Battery Energy Storage Systems

Lithium-ion storage facilities contain high-energy batteries combined with highly flammable electrolytes. In addition, they are prone to quick ignition and explosion in a worst-case scenario. Such fires can have a significant financial impact on organizations. Rapid detection of electrolyte gas particles and extinguishing are the key to a successful fire protection concept. Since December 2019, Siemens has been offering a VdS-certified fire protection concept for stationary Li-ion battery storage systems.

Click HERE to learn more.

For a Multiplied Value Unified


During the last few years, the Excelpro Group has welcomed AIA Automation, Envitech Automation and Conrad Lavoie Electrical, all of which have become ‘Member of the Excelpro Group’.

It was with great excitement that in November of 2022, Excelpro announced that these three companies officially became Excelpro. This decision is part of a strategy to enhance the Excelpro Group’s brand in its market.

These companies already collaborate on various client projects. This merger brings together the complementary strengths of the employees and ensures a global synergy of the activities throughout the Group.

Read More

Service Wire Co. Announces New Titles for Key Executives

Bruce Kesler and Mark Gatewood have been given new titles and responsibilities for Service Wire Co.

Bruce Kesler has assumed the role of Senior Director – Business Development. Bruce will be responsible for Service Wire’s largest strategic accounts and our growing Strategic Accounts Team.

Mark Gatewood has been promoted to the role of Vice President – Sales & Marketing. In this role, Gatewood will lead the efforts of Service Wire Company’s entire sales and marketing organization in all market verticals.

Read More

Modern Niagara Partners with Global Sustainability Platform Worldfavor

Worldfavor is a global sustainability platform, digitizing and automating the collection, calculation, aggregation and visualization for analysis and reporting of ESG data. Now, Worldfavor is proud to welcome Modern Niagara as a new customer. Modern Niagara is the first Canadian construction company to partner with Worldfavor.

“Worldfavor was founded to be the best platform for sharing, accessing and gaining insights from corporate ESG information. Worldfavor’s mission is to make sustainability mainstream and with that we offer solutions to accelerate sustainability through the value chain. Modern Niagara is the first Canadian construction company to partner with Worldfavor. 

Read More

JMP Parent Company, CONVERGIX Acquires AGR Automation, Expanding Global Reach

Convergix Automation Solutions has completed the acquisition of AGR Automation (“AGR”), a UK-based provider of custom, high-performance automation design and systems integration primarily to the life sciences industry.

Following Convergix’s acquisitions of JMP Solutions in August 2021 and Classic Design in February 2022, AGR marks the third investment in Crestview’s strategy to build Convergix into a diversified automation solutions provider targeting the global $500+ billion market, with a particular focus on the $70 billion global systems integration and connectivity segments. Financial terms of the transaction were not disclosed.

Read More

Latest Articles