This document describes the Digital Muffle Furnace, models DMF-05, DMF-12, DMF-27, DMF-24, DMF-125, and DMF-216, manufactured by HumanLab Instrument Co. It serves as an operating manual, providing essential information for safe and proper use, setup, operation, maintenance, troubleshooting, and specifications of the device.

Function Description

The Digital Muffle Furnace is a high-temperature oven designed for various applications requiring precise heat treatment. It is ideally suited for:

Developing advanced materials.
Super conduction material experiments.
Ceramic sintering.
Heat treatment processes.
Glass melting.
Metal melting.
Shaping molding sand.

The furnace utilizes a Digital PID controller for accurate temperature control and features high-performance heat insulation to ensure quick temperature reach and stable operation.

Important Technical Specifications

The Digital Muffle Furnace series offers a range of capacities and power configurations:

Models and Capacities:

DMF-05(H): 4.5 liters
DMF-12(H): 12 liters
DMF-27(H): 27 liters
DMF-64(H): 64 liters
DMF-125(H): 125 liters
DMF-216(H): 216 liters

Chamber Dimensions (WxDxH)mm:

DMF-05(H): 150x300x100
DMF-12(H): 200x300x200
DMF-27(H): 300x300x300
DMF-64(H): 400x400x400
DMF-125(H): 500x500x500
DMF-216(H): 600x600x600

Temperature Range:

Standard models: 100-1200℃
H series: 300-1500℃

Temperature Sensor:

Standard models: CA type thermocouple
H series: R type thermocouple

Heating Elements and Time to Reach Temperature:

DMF-05(H): 2.6 Kw, 16 min.
DMF-12(H): 4.4 Kw, 19 min.
DMF-27(H): 6.2 Kw, 20 min.
DMF-64(H): 11.1 Kw, 23 min.
DMF-125(H): 21 Kw, 22 min.
DMF-216(H): 40 Kw, 22 min.

Materials:

Interior: Stainless steel plate
Exterior: Powder coated steel plate
Insulation: Ceramic fiber (Standard) / Ceramic mold & board (H series)

Door:

Magnetic closure, silicon rubber packing

Control & Display:

Microprocessor control & LCD display
Displays Temperature, Time, Heater On/Off, Alarm

Safety Device:

Over temperature limiter & alarm

Electric Power:

DMF-05(H), DMF-12(H), DMF-27(H): 220VAC, 50/60Hz, single phase
DMF-64(H), DMF-125(H), DMF-216(H): 220VAC, 50/60Hz, 3 phase

Overall Dimensions (WxDxH)mm and Weight (Kg):

DMF-05(H): 420x560x535, 35 Kg
DMF-12(H): 500x550x580, 45 Kg
DMF-27(H): 580x590x740, 65 Kg
DMF-64(H): 680x690x840, 100 Kg
DMF-125(H): 780x790x940, 140 Kg
DMF-216(H): 880x890x1040, 180 Kg

Usage Features

Setup and Installation:

Install on a firm, stable, and level surface, avoiding heat, humidity, dust, and vibration.
Ensure the installation area is well-ventilated with enough space.
The door can open to an angle of 180 degrees, so consider sufficient clearance.
Leveling feet are provided for stable standing; confirm the equipment is leveled using these feet.

Safety Warnings:

Danger: Do not place flammable or explosive materials in the chamber to prevent explosion or fire.
Warning: Do not place flammable materials near the equipment. Avoid touching the power cord with wet hands. Do not overload electric outlets. Always connect a ground wire to prevent electric shock.
Caution: Ensure the power voltage is 220VAC, 50/60Hz before plugging in. Avoid using other high-voltage equipment nearby. Do not pour water directly on the equipment. Do not use acid solutions, benzene, or sharp objects for cleaning. Do not pull the power cord to unplug; hold the plug itself. Unplug the unit if not in use for a long period. Avoid putting too many objects in the chamber to ensure proper air circulation.
High Temperature: Ceramic blocks are very hot after operation; do not contact them.
Electric Shock: Unplug the power before opening covers. Install a ground wire.

Operating Procedures:

Power On: Turn the power switch on. The PV display shows the actual oven temperature, and the SV display shows the set temperature.
Set Temperature: Press the "Mode" key to enter temperature set mode. 'TEMP' appears on the PV display, and the SV display flashes. Use the digit position movement key (◄), increase (▲), and decrease (▽) keys to set the desired temperature.
Set Timer: Press the "Mode" key again to enter timer mode. 'TIME' appears on the PV display, and the SV display flashes. Set the timer using the arrow keys. Default time format is Hour/Minute (HH.MM), but can be changed to Date.Hour or Minute.Second. If the timer is set to 00:00, it will not function.
Complete Setting: Press the "Mode" key to complete setting; the set value stops flashing, and displays return to PV/SV mode.
Start Operation: Press the "START" key for 2 seconds. The RUN and OUT indicator lights turn on, and the heater begins operating. The timer indicator blinks until the set temperature is reached, then turns on.
Stop Operation: The RUN light will blink, and 'end' will appear with a "beep" tone for 30 seconds. Press "START/STOP" to stop the beep immediately.

Auto-Tuning Function:

Calculates the most effective PID and ARW integers automatically.
Can be started while temperature is rising or after set temperature is reached.
Press the "Auto" key for 5 seconds until a "beep" tone is heard. The AUTO indicator light will flash during auto-tuning and turn off upon completion.
To stop auto-tuning, press the "AUTO" key for 5 seconds during the function.
Factory default auto-tuning is set between 300°C ~ 400°C. For temperatures higher than 400°C, perform auto-tuning under your specific testing conditions for more accurate and stable temperature operation.

Changing Time Format:

Turn the power on.
Press "Mode" for 2 seconds until a 'beep' sound (Parameter Set mode).
Press "Mode" and "<" simultaneously for 2 seconds until a 'beep' sound (Main Menu of Factory Mode).
Press "Mode" continuously until 'TM.SC' (time format set) displays.
Use "Up/Down" arrow keys to set the time format (HH.MM, DD.HH, or MM.SS).
Press "Mode" to store the input (LED stops flashing).
Press "Mode" and "<" simultaneously for 2 seconds to exit.

Restoring Factory Default Settings:

Turn the power on.
Press "Mode" for 2 seconds until a 'beep' sound (Parameter Set mode).
Press "Mode" to display 'LOC'.
Change 'LOC' to '1000' using arrow keys and press "Mode" to complete input.
Press "Mode" to change to 'LOAD' display.
Change 'NO' to 'YES' using arrow keys and press "Mode" to complete input.
Press "Mode" and "<" simultaneously for 2 seconds to exit.

Maintenance Features

General Maintenance:

Always switch off the unit and disconnect power before any maintenance.
Unauthorized personnel should not attempt to open, repair, or modify the unit.

Cleaning the Chamber Interior:

Remove the plug from the outlet.
Remove shelves and shelf hangers.
Wipe the inside with a soft cloth using a neutral detergent.
Clean again with a soft towel.

Cleaning the Equipment Surface:

Use a sponge or soft cloth with a neutral detergent.
Wipe the unit with a dry cloth.
Do not use organic solvents.

Cleaning Electric Parts:

Always use a dry cloth.

Storage (Long-term Non-use):

Remove the plug from the outlet.
Clean the unit with a soft towel.
Wrap and store it.

Warranty:

Free repair service for defects in material or workmanship for one year from the purchase date, under appropriate conditions.
Molded ceramic blocks are expendable and not repairable.
Repair service will be charged for damages due to improper operation, modification, unauthorized repair attempts, inappropriate handling/transportation, acts of God (fire, flood, wrong voltage), or not following operating instructions.
Customer pays for delivery charges for repair service.

HumanLab DMF-05 - Component Identification