Tutorials - Deltech Furnaces

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About Ceramic Furnace Tubes

Thermal Expansion of Process Tubes Used in Furnaces Alumina tubes will expand uniformly when heated homogenously. But when they are used to process materials in furnaces, they develop thermal gradients due to factors such as the presence of the substance being processed inside the tube. While gradients can be controlled through expert furnace design and …

Need troubleshooting assistance?

Need troubleshooting assistance? Deltech Furnaces offers several ways for you to get assistance in troubleshooting your system. Send an email to sales@deltechfurnaces.com. If appropriate, send photos and/or videos which shed light on the problem at hand. Check out the video tutorials on our website that explain how to identify a broken element. The most common …

Eurotherm 3504 Controller Auto Tuning

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Eurotherm 3504 controller Setup With Events Type S

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Eurotherm 3504 controller Setup With Four Events Type K

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L-91 Configuration Instructions All Thermocouple Types

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West N6701 Configurations Instructions Type R thermocouple

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West N6701 Configuration Instructions Type S thermocouple

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West N6701 Configuration Instructions Type K thermocouple

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West N6701 Configuration Instructions Type B thermocouple

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West-N6701 Configuration Instructions Type 20/40 Thermocouple

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Eurotherm 3504 Sample program 800 C Dwell

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Eurotherm 3504 Quick Start Instructions

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Eurotherm 3504 controller Setup Thermocouple Type 20 40 and two events

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Eurotherm 3504 controller Setup No Events Type S thermocouple

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Eurotherm 3504 controller Setup No Events Type R thermocouple

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Eurotherm 3504 controller Setup No Events Type K thermocouple

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Eurotherm 3504 controller Setup Events and Type R thermocouple

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Eurotherm 3504 controller Setup With Two Events and Type B thermocouple

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Eurotherm 3504 controller Setup With No Events and Type-B thermocouple

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Eurotherm 3504 controller Setup With Four Events and Type K thermocouple

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Eurotherm 3504 controller Setup With Four Events and Type B thermocouple

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Eurotherm 3504 controller Setup With Eight Events and Type-B thermocouple

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Water cooled end caps installation

Water cooled end caps installation You may be wondering how to go about placing your NASA-designed water-cooled end caps onto your process tube. Follow the instructions below. If you have any questions, contact us. The water-cooled tube seal must be attached to the top end of the ceramic process tube. When operating the furnace, …

Element deformation

Element deformation When installed in the furnace and fired, molydisilicide heating elements can take on some interesting shapes. The characteristic “hairpin” can bow and bend. This is due to electro-magnetic forces. A certain amount of deformation is normal; see the photo below. The pictured Deltech furnace had been relined, new elements installed, fired to the …

Lab Scale RS Glass Melt Maintenance Guide

We all know maintenance can prevent future problems. It can help minimize furnace downtime and ensure operator safety. Do you have a lab scale Deltech glass melt furnace? Most often this will be a bottom loading unit, but top hat and front load models can also be supplied. If so, you’ll be interested in knowing …

Production Scale Front Load Furnace Maintenance Guide

We all know maintenance can prevent future problems. It can help minimize furnace downtime and ensure operator safety. Do you have a Deltech vertical tube, bottom loading vertical tube, or horizontal tube furnace?

Lab Scale Front Load Furnace Maintenance Guide

Lab Scale Bottom Load Furnace Maintenance Guide

Tube Furnace Maintenance Guide

Furnace ramp rates

Furnace ramp rates Furnace Ramp Rates for 1600-1800 °C Models Initial Heating/Element Seasoning… Ramp the empty furnace to 1550 degrees Celsius at the rate of 100 degrees Celsius per hour; then hold at 1550 degrees Celsius for one hour. This procedure conditions the molydisilicide heating elements by allowing formation of a glass protective glaze on …

FAQs: Atmosphere Envelope Furnaces

FAQs: Atmosphere Envelope Furnaces What exactly is an atmosphere envelope furnace? The furnace features a gas tight working chamber that can be operated at up to .022 atmospheric pressure. Glands seal the electrodes and thermocouples, and the door is sealed with silicone or viton material. The result is a sealed envelope that allows processing in …

Which bench top model is best for you?

Which bench top model is best for you? Our director of Sales, Design, and Engineering prepared this tutorial to help someone unfamiliar with the world of bench top laboratory furnaces decide on the best model for their applications. All three are easy to operate and maintain and have features which facilitate different kinds of thermal …

Maintaining your production size bottom load furnace

Maintaining your production size bottom load furnace Maintaining your production size bottom load furnace on a regular basis can eliminate or minimize future downtime, not to mention ensure operator safety. Deltech recommends the following: Monthly Inspect the interior of the furnace for cracking and/or pin failures. Replace pins as needed. Please contact Deltech if any …

Production scale top hat furnace maintenance

Production scale top hat furnace maintenance No one wants expensive surprises and unhappy customers! Help prevent unplanned production downtime by following these guidelines for your Deltech production scale top hat furnace. Every month Inspect the interior of the top hat furnace for cracking and/or pin failures. Replace pins as needed. Contact Deltech if any large …

Lab scale Top Hat furnace maintenance

Lab scale Top Hat furnace maintenance Do you have a bench top size “top hat” model Deltech furnace? If so, you’ll be interested in knowing the recommended maintenance for your furnace. We all know maintenance can prevent future problems. In the case of furnaces, it can help minimize future downtime and ensure operator safety, two …

Planning Your Visit: What you need to know

Planning Your Visit: What you need to know Deltech looks forward to welcoming you to our facility. Safety is our top priority and we want to ensure that our guests remain safe while visiting our facilities. The following Overview and Safety Guidelines will help you prepare for your visit. Visitor Overview All visitors are required …

About Deltech Water Cooled End Caps

About Deltech water cooled end caps Water cooled end caps allow access to the tube interior without removal of the caps themselves. This is accomplished with the use of flat end plates that can be easily removed. The plates can also be customized with special fittings such as hooks to meet the requirements of your …

Vertical Tube Installation Instructions

Vertical Tube Installation Instructions Determine your preferred distance from the top of the furnace to the top of the tube. Make a pencil mark on the tube at the distance you determined. With fiber wrap between the tube and the clamp, wrap around and tighten a hose clamp at the pencil mark. …

What you need to know about furnace installation assistance

What you need to know about furnace installation assistance If you purchase a Deltech production scale furnace or a Deltech specialty furnace (such as one of our 2000 degrees celsius models), on site installation assistance is normally included. To get maximum benefit from the site visit from Deltech technicians/engineers and avoid additional charges, you should …

Important information about rebuild roof and hearth parts…

Important information about rebuild roof and hearth parts… You will find upon receiving your spare parts order for roof or hearth pieces, that in many cases the holes have not been drilled for your elements, support tubes, thermocouples, etc. This is due to the alignment problems that can occur from having your spare parts drilled …

Prevent element damage due to arcing

Prevent element damage due to arcing If your Deltech furnace is a high temperature (1500 degrees centigrade or above) model, it will likely feature molydisilicide heating elements. Regardless of the kind of connectors in use; i.e. holders and braids or buss bars, repeated thermal cycling can and will result in those connections loosening up. That creates …

Why won’t my furnace heat?

Why won’t my furnace heat? If your furnace isn’t heating at all, start here: Go to the control cabinet and turn the control power and the element power off. Then turn first the control power and then the element power back on. You should hear a “clunk”. That’s the contactor (image right) allowing power to …

Controlled atmosphere furnaces … tubes and more

Controlled atmosphere furnaces…tubes and more First, about those tube models… Horizontal and vertical tube furnaces are great if you need only a relatively small work space. If you are operating at high temperatures and need to use an alumina process tube, it’s best to limit the tube outer diameter to 4″ (100mm) and …

Five Things you should know about Furnace Startup

Five Things you should know about Furnace Startup Control Parameters. Deltech is responsible for the initial configuration of your temperature and limit controllers prior to the shipment of your furnace system. This includes setting the thermocouple type, temperature scale, upper and lower temperature limits, PID values, and events. Should you wish to verify or change …

Two Furnaces for the Price of One – Convertibles

Two Furnaces for the Price of One! – Convertibles Convertible furnaces are Deltech products that you may not know about. Suppose you are planning on sharing furnace time with colleagues, but you need a controlled atmosphere tube design and they want a bottom loader. You really can have it all with a CVT/BL or CHT/BL model …

What is a Top Hat Furnace?

Updated: Article originally published in September 2018 has been amended with new details In standard elevator furnaces – also known as bottom loader furnaces – a mechanism is used to elevate the load platform or kiln car into the furnace body. As the heating chamber itself doesn’t move, all the internal elements (heating coils, rods, …

Five Things you Should Know about Controlled Atmosphere Furnaces

Controlled atmosphere front load furnace: There are many vertical and horizontal tube furnaces suppliers, but few suppliers of front load, bottom load, and top hat furnaces specially designed for processing in inert atmospheres. To do so, the furnace must be sealed: the element ports, thermocouple ports, and door access. Gas inlets will allow purging …

Help avoid “furnace down” crises

Tips on avoiding furnace down crises and the often related expenses… The first is keep a few spares for critical consumable components on hand. What are these “critical consumables”? Heating elements When I replace the water filter in my refrigerator, I reset a counter that indicates via a light that so many gallons have …

Meltdown! How to Avoid a Furnace Disaster

Meltdown! How to avoid a furnace disaster by using the safety features of the furnace system No one wants to hear “furnace” and “disaster” in the same sentence. Your new Deltech furnace control system was supplied with a limit controller to help you avoid one kind of catastrophe. A limit controller is a relatively inexpensive …

Meltdown! Beware of Manual Mode Operation

Dangers of manual mode furnace operation… Your high temperature lab furnace system was supplied with a programmable temperature controller which allows you to input numerous programs with various segments such as “ramp”, “soak”, and “repeat”. You can then, for example, select program #1 for product #1 and walk away, free of the need to monitor …

Introduction to Deltech Furnaces Resistance Heating Systems

Following is a brief introduction to how the main components of a Deltech Furnaces resistance heating system work together. The main components are the (1) control system, including the temperature controller and control thermocouple; power control system (including SCR power controller, current transformer, and ammeter); transformer; and overtemperature protection circuit (including a limit controller, contactor, …

Why use a transformer? And why Olsun transformers?

We’ve been asked why we control the power to molydisilicide heating elements using not only a phase angle fired SCR power controller, but also an isolation type stepdown transformer. After all, the SCR will do a good job of regulating the volts and amps required to fire the load, and the transformer is an …

About Molydisilicide (MoSi2) Heating Elements

Most Deltech furnaces are designed for maximum operating temperatures in the 1500-1800 deg C range and for operation in air, so molydisilicide heating elements are used because of their ability to quickly attain and sustain high temperatures and their affinity for oxidizing atmospheres. Despite their robust appearance they are a fragile, glasslike material with …

Deltech Furnaces Offers Sophisticated HMI Solutions

Deltech Furnaces Offers Sophisticated HMI Solutions Did you know that HMI (human machine interface) functions coupled with your Deltech furnace control system can do much more than simple data acquisition and logging? These days even the traditional chart recorder has been incorporated into programmable temperature controllers. These controllers feature the now familiar PID programming, multiple …

How to Choose a Resistance-Heated Batch Furnace

When looking to purchase a resistance-heated batch furnace, there are a number of factors to consider before making your final decision. Resistance-heated furnaces are electrical furnaces that use heat that is generated by conductors. These furnaces are commonly used in heat treatment, where materials need to be heated before they are melted, dried or pressure …