35L-625L Drying Cabinet And Oven

35L-625L Vertical Drying Cabinet and Oven for Materials Drying and Heat Treatment - TOB-DHG-9030A Series

Product Overview and Ideal Applications

The 35L-625L Drying Cabinet and Oven is a vertical drying cabinet and oven series covering volumes from 35 litres to 625 litres (1.2 to 22 cubic feet). It is supplied in seven models - TOB-DHG-9030A, TOB-DHG-9070A, TOB-DHG-9140A, TOB-DHG-9240A, TOB-DHG-9420A, TOB-DHG-9620A, and TOB-DHG-9920A - so the chamber size can be matched to the load, from small laboratory samples to larger production batches. The representative model of the series is the TOB-DHG-9030A.

The series is mainly used in scientific research units, specialty universities, laboratories, and industrial mining enterprises, as well as in the production field, for materials drying and heat treatment. Within that range of users, the common requirement is the same: a chamber that holds a defined temperature evenly, for a defined time, with the process visible and repeatable.

The oven is built around a hot air circulation system. A reasonable hot air circulation channel is designed in the cabinet, so that the temperature distribution in the cabinet is more even and the temperature rises faster. The cabinet is equipped with an adjustable air outlet for adjusting the air in and out of the cabinet, and bad air can also be output by connecting a pipe to the outside of the workplace. Temperature is controlled by a microcomputer intelligent digital technology controller with PID function and LED display, and a 30-segment programmable temperature controller is available with time and temperature setting in sections with a sound alarm - so a full drying or heat-treatment profile, including stepped ramps and dwells, can be programmed and run.

Construction details support the process: a mirror stainless steel inner chamber that is smooth and easy to clean, a cold-rolled steel outer body with an electrostatic sprayed, hard and anti-rust coat, a multi-layer insulation system with ultra-fine glass fiber and an aluminum foil reflector, a double-layer tempered glass observation window for viewing the test result, and a nickel chromium alloy electric heater rated for the chamber volume of each model.

Ideal for:

• Scientific research units, specialty universities, and laboratories performing materials drying and heat treatment on samples and small batches.
• Industrial mining enterprises and production fields that need a defined drying or heat-treatment step with repeatable temperature and time settings.
• Workflows that require stepped or multi-stage temperature profiles, using the 30-segment programmable controller with sectional time and temperature setting and sound alarm.
• Sites where exhaust air should be led out of the workplace through a connected pipe, using the cabinet's adjustable air outlet.
• Operations that need to observe the process through the door, via the double-layer tempered glass observation window.

Need to confirm which chamber volume and configuration suits your material and batch size? Contact our equipment engineers with your required working volume, temperature profile, and power supply, and we will recommend the model from the series.

Complete Technical Specifications

The model comparison and common specifications data.

1. Model Comparison

2. Common Specifications (all models)

Where the Series Fits in Materials Drying and Heat Treatment

In laboratory and production workflows, drying and heat treatment are defined steps that sit between material preparation and the next process stage: moisture and volatiles are removed before a material is weighed, mixed, tested, or processed further, and controlled heating is applied when a material needs a defined thermal treatment. The drying cabinet and oven provides that controlled environment.

The series covers the workflow scale from small to large: the 35 L chamber serves sample-level work, while the 625 L chamber serves larger batches and production support tasks, and the intermediate models cover the range in between. In each case the process requirement is the same - hold the material at a set temperature, within the defined fluctuation, for the set time, in an environment where the air is exchanged as the process requires.

Two features of the series align with this workflow. First, the hot air circulation channel keeps the chamber temperature even and brings the chamber up to temperature quickly, so the material is exposed to the same condition throughout. Second, the 30-segment programmable controller allows time and temperature to be set in sections, so a process that requires controlled heating, a dwell, and a further step can be programmed as one run with a sound alarm, rather than being re-set by hand between stages.

Working Principle and Key Systems

Hot air circulation. A reasonable hot air circulation channel is designed in the cabinet. The forced air circulation channel ensures that the studio temperature is uniform, and the air duct is provided with a heater and a temperature sensor. This is the basis for even temperature distribution and fast temperature rise. The cabinet is equipped with an adjustable air outlet for adjusting the air in and out of the cabinet, and bad air can be output by connecting a pipe outside the workplace.

Temperature control. Temperature control uses a microcomputer intelligent digital technology controller with PID function and LED display. The 30-segment programmable temperature controller supports time and temperature setting in sections with a sound alarm, so multi-stage profiles can be programmed and run. Temperature is measured by an A-grade PT100 platinum resistance sensor.

Heating and insulation. Heating is by electric heating with a nickel chromium alloy electric heater. The heat pressure layer is a high quality insulation system: inner box, inner shell, ultra-fine glass fiber, aluminum foil aluminum reflector, and air interlayer from inside to outside. The furnace body (cabinet body) construction keeps heat within the chamber and the outer surface condition defined by the outer material.

Cabinet construction. The inner box is made of high quality mirror stainless steel plate, round shape, smooth surface, easy to clean. The outside material is high quality cold-rolled steel plate, the surface electrostatic spray, hard and firm coat, with strong anti-rust ability. The box door is provided with a double-layer tempered glass observation window, so the test result can be observed easily.

Safety. The oven is provided with over temperature protection and grounding.

Key Engineering Characteristics of the 35L-625L Series

1. Seven Chamber Sizes from 35 L to 625 L The series covers volumes from 35 litres to 625 litres (1.2 to 22 cubic feet) across seven models, with shelves and power matched to each chamber size - 2 shelves and 550 W on the smallest model up to 3 shelves and 6000 W on the largest.

2. Hot Air Circulation Channel for Even Temperature and Fast Rise A reasonable hot air circulation channel is designed in the cabinet, so the temperature distribution is more even and the temperature rise is faster. The forced air circulation channel ensures a uniform studio temperature, and the air duct carries the heater and the temperature sensor.

3. Adjustable Air Outlet with Pipe Connection for Exhaust The cabinet is equipped with an adjustable air outlet for adjusting the air in and out of the cabinet. Bad air can be output by connecting a pipe to the outside of the workplace - useful where the process releases vapor or odor that should not remain in the room.

4. Microcomputer Intelligent PID Controller with LED Display Temperature control uses a microcomputer intelligent digital technology controller with PID function and LED display, providing stable control within the ±0.5 °C temperature fluctuation of the series.

5. 30-Segment Programmable Temperature Controller The 30-segment programmable temperature controller is with time and temperature setting in sections with sound alarm - so stepped profiles, dwell stages, and multi-stage heat treatments can be programmed and run with an audible signal for the operator.

6. High-Quality Mirror Stainless Steel Inner Chamber The inner box is made of high quality mirror stainless steel plate, round shape, smooth surface, easy to clean - supporting clean sample handling and straightforward cleaning between batches.

7. Durable, Anti-Rust Exterior The outside material is high quality cold-rolled steel plate with electrostatic spray surface, hard and firm coat, with strong anti-rust ability - suited to the daily working environment of laboratories and production areas.

8. Multi-Layer Insulation System The heat pressure layer is a high quality insulation system with inner box, inner shell, ultra-fine glass fiber, aluminum foil aluminum reflector, and air interlayer from inside to outside - retaining heat in the chamber and contributing to the fast temperature rise.

9. Double-Layer Tempered Glass Observation Window The box door is provided with a double-layer tempered glass observation window, so the test result can be observed easily without opening the door.

10. A-Grade PT100 Sensor, Nickel Chromium Alloy Heater, and Safety Protection Temperature is sensed by an A-grade PT100 platinum resistance sensor, heat is provided by a nickel chromium alloy electric heater, and the oven includes over temperature protection and grounding. The timing range is 1-9999 min.

Practical Operating Recommendations

• Select the model by load and volume: the series covers 35 L to 625 L with corresponding shelf counts and power ratings. Choose the chamber size that holds the batch with clearance for air circulation around the load.
• Set the process on the controller: temperature control uses the microcomputer intelligent PID controller with LED display. For multi-stage work, program the 30-segment controller with time and temperature set in sections; the sound alarm signals the programmed stages.
• Adjust the air exchange: set the adjustable air outlet according to the process requirement for air in and out of the cabinet. Where the process releases vapor or odor, connect a pipe to lead the bad air outside the workplace.
• Observe through the window: the double-layer tempered glass observation window allows the test result to be observed easily without opening the door, so the chamber condition is not disturbed during a run.
• Keep the load within the shelves: respect the shelf count of the model (2 or 3 shelves depending on model) and avoid blocking the circulation path of the air duct.
• Ensure grounding and protection settings: the oven is provided with over temperature protection and grounding. Confirm the grounding connection at installation and keep the over temperature protection active.
• Work within the rated conditions: the temperature range is RT+10 to 250 °C and the timing range is 1-9999 min. Match the power supply to the source voltage shown for your configuration (110 V / 220 V 50 Hz).
• Clean the chamber between materials: the mirror stainless steel inner chamber is smooth and easy to clean, which supports cleaning between different materials or batches.

Engineering FAQ

Q1: What sizes does the 35L-625L Drying Cabinet and Oven series cover? 

The series covers volumes from 35 litres to 625 litres (1.2 to 22 cubic feet) across seven models: TOB-DHG-9030A, TOB-DHG-9070A, TOB-DHG-9140A, TOB-DHG-9240A, TOB-DHG-9420A, TOB-DHG-9620A, and TOB-DHG-9920A. Work box sizes range from 340 x 320 x 320 mm to 800 x 600 x 1300 mm, with 2 or 3 shelves and power from 550 W to 6000 W depending on the model.

Q2: What is the temperature range and control accuracy? 

The temperature range is RT+10 to 250 °C, with a temperature fluctuation of ±0.5 °C. Temperature control uses a microcomputer intelligent digital technology controller with PID function and LED display, and a 30-segment programmable temperature controller with time and temperature setting in sections with sound alarm. The sensor is an A-grade PT100 platinum resistance.

Q3: How does the air circulation system work? 

A reasonable hot air circulation channel is designed in the cabinet, so the temperature distribution is more even and the temperature rises faster. The cabinet is equipped with an adjustable air outlet for adjusting the air in and out of the cabinet, and bad air can be output by connecting a pipe outside the workplace.

Q4: What are the chamber and body construction details? 

The inner box is made of high quality mirror stainless steel plate, round shape, smooth surface, easy to clean. The outside material is high quality cold-rolled steel plate with an electrostatic spray surface, hard and firm coat, and strong anti-rust ability. The insulation system comprises inner box, inner shell, ultra-fine glass fiber, aluminum foil aluminum reflector, and air interlayer from inside to outside. Heating is electric heating with a nickel chromium alloy electric heater.

Q5: What is the timer range? 

The timing range is 1-9999 min.

Q6: What safety features are provided? 

The oven is provided with over temperature protection and grounding. The 30-segment programmable controller also includes a sound alarm function with the sectional time and temperature settings.

Q7: What power supply does the oven use? 

The source voltage is 110 V / 220 V 50 Hz as supplied. Please confirm the configuration for your order and site supply with our team.

Q8: What is the warranty? 

One year limited warranty with lifetime support.

Q9: What is the oven mainly used for? 

The series is mainly used in scientific research units, specialty universities, laboratories, and industrial mining enterprises, as well as in the production field, for materials drying and heat treatment. If you have a specific material or process requirement, contact our engineers with the temperature profile and we will confirm the suitable model and configuration.

Ready to add uniform-temperature drying and heat treatment to your laboratory or production area? Request a quotation for the 35L-625L Drying Cabinet and Oven series with your required chamber volume, working temperature profile, and power supply. Our equipment engineers can recommend the model from the seven available sizes and confirm the configuration for your process.

tob.amy@tobmachine.com | +86 181 2071 5609

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