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MPA160& MPA161 Digital Melting Point Apparatus for Students

DigiMelt is a modern, low cost, digital melting point apparatus designed specifically for the student lab. Students learn the visual detection capillary method of melting point determination without the frustration of trying to control the oven temperature. DigiMelt rapidly heats the oven to the programmed start temperature, then ramps at the specified rate. The student carefully observes the samples and records the melting points with a touch of a button.

Digital Temperature Readout

DigiMelt incorporates a platinum resistance temperature detector (RTD) instead of the usual mercury thermometer. This means better accuracy on the readings, and no more mercury cleanup from broken thermometers. The RTD is encased inside the oven block making it virtually unbreakable.

Microprocessor Temperature Control

Some student instruments use a large knob that simply throttles power to the oven without any sense of what the target temperature is. DigiMelt uses an RTD for feedback, so it "knows" the oven temperature. This means the students can enter a start temperature, a ramp rate, and a stop temperature and the microprocessor takes care of the rest. Furthermore, the microprocessor can deliver variable amounts of power to the oven, so it can quickly ramp to the starting temperature, then perform the ramp as slowly as 0.5 ºC/min.

High Quality Optics

Rather than forcing the student to peer through a tiny lens with poor illumination, the DigiMelt uses a large magnifier that allows plenty of eye relief. The user can see all three capillaries easily at a comfortable distance from the instrument. White LEDs are used to provide high-contrast illumination.

Tube Tapper

For many students, the melting point lab is the first time they have touched a capillary. This can lead to lots of capillaries on the floor and many broken capillaries. DigiMelt employs an integral cell phone vibrator motor to let students pack their sample without tapping them on the bench or dropping them through a long glass tube. A molded guide in the chassis allows students to pack three samples at a time.

Easy Maintenance

Cleaning the lens is as simple as removing the lens retaining ring. If a student should break a capillary, the entire lens holder assembly slides out for easy clean up of the broken glass. Replacing thermometers is a thing of the past as the RTD will never break and cannot be removed from the instrument. Unlike conventional incandescent bulbs that must be periodically replaced in some student instruments, the white LEDs used in DigiMelt will last a lifetime.

Safer for Students

The DigiMelt uses an internal RTD thermometer, which means students and TAs are never exposed to toxic mercury vapors. Some student instruments will reach 500 °C and stay at that temperature indefinitely — a severe burn hazard. The DigiMelt’s maximum temperature is 260 °C, which allows testing of virtually all organic compounds a student might examine. Intelligently designed cowling protects students from touching the hot oven. Furthermore, the oven will automatically turn off after being idle for 30 minutes.



Safety Concerns in a Melting Point Lab 

When using a Mel-TempWhen using a DigiMelt ...
Handle your mercury thermometer with care. A broken thermometer leads to a mercury spill.

DigiMelt does not use a mercury thermometer.

Not a concern.

Do not heat the Mel-Temp beyond the upper temperature limit of your thermometer.

DigiMelt can not reach an unsafe temperature.

Not a concern.

Never insert a glass thermometer into a hot Mel-Temp. It may shatter.

DigiMelt uses a solid-state temperature sensor built into the oven.

Not a concern.

Do not leave the Mel-Temp on after your experiment is over. Do not leave the Mel-Temp on unattended.

DigiMelt will turn off when the experiment is over or after 30 minutes of inactivity.

Not a concern.

Do not touch the heating block while it is hot.

DigiMelt's oven is shielded by a safety cowl.

Not a concern.

Do not place your eye on the eyepiece when the unit is hot.

DigiMelt's eyepiece is designed to be viewed from a safe distance. In addition, the safety cowl prevents the user from actually placing their eye against the eyepiece.

Not a concern.


MPA160& MPA161 Digital Melting Point Apparatus for Students


Type4 digit LED
ReadoutStart, stop or ramp rate, oven temperature, and stored measurement data


Resolution0.1 °C
Accuracy±(0.45+0.0045T) where T is temperature in Centigrade
Typical: ±0.6 °C (<200 °C), ±1.0 °C (≥200 °C)
Reproducibility0.2 °C


Range50 °C to 260 °C
Ramp rate0.5, 1.0, 2.0, 5.0, 10, 20 °C per minute
Heat-up time (typ.)   2.5 minutes to 100 °C, 6.5 minutes to 250 °C
ThermometerBuilt in Pt RTD
Temperature controlClosed-loop PID
Safety shut offAutomatic after 30 minutes idle


Dimensions1.4 mm to 1.8 mm outside dia., 100 mm length
CapacityUp to 3 tubes
Fill height  2 mm to 3 mm
Sample packingAutomatic (tube tapper)


   MPA160100 to 132 VAC, 50 to 60 Hz, 1 A, 75 W nominal
   MPA161200 to 250 VAC, 50 to 60 Hz, 1/2 A, 75 W nominal
Environment0 °C to 30 °C, non-condensing
Weight   2 lbs.
Dimensions6.5"× 9.5"× 5.25" (WHD)