Laboratory bath

This laboratory electronic bath for me, as for a radio amateur, has simply become an indispensable assistant. If you are involved in radio electronics, I sincerely recommend repeating it to you.
Laboratory bath

What is a water bath.

A laboratory water bath is a container with a heater controlled by a thermostat. The electronic thermostat allows to maintain the set temperature in the tank with great accuracy. The bath is equipped with two heating elements, power is 100 W each.

Why do I use the bath?

I often have to make printed circuit boards. The process of manufacturing printed circuit boards requires operations such as pickling and tinning. That's just the process I spend using this bath. Of course, the etching can be carried out at normal temperature, but in the heated bath it passes many times faster. As for tinning, then there is no heating. I fill the bath with glycerin (or water with citric acid),I set the maintenance temperature at 110 degrees and calm the puddle of the board. With chemical reactions, everything is clear: heating by ten degrees speeds up the chemical reaction by about two. That reduces the time of its flow, thereby saving you time. The laboratory bath can find another use. For example, it can be used as a dryer for bulk materials, only in this case the thermostat sensor should be tightly attached to the heating element, and the heating elements are connected in parallel. And so proceed! To begin with, I will offer you two versions of the bath: for 12 V and 220 V. I used elements for 110 V, since we have 110 volts in the network in our country. Components that need to be purchased. I immediately give you links to the store. 12 volt option (safer option): 220 volt option:
- Bath (pan) made of stainless steel or surgical steel. (Any store with utensils) - Wooden sheets of plywood for the hull - at least ODSP, though DSP, even OSB. That's your business. I recommend the use of a moisture resistant plywood. Heaters and thermostats can be other, see how many of them - heaters, thermostats.You can find a cheaper option or another form.

Laboratory bath design.

Laboratory bath
The sequence is as follows: the bath itself with the liquid and the temperature sensor immersed in it. Heating elements are glued to the bath. Then comes the insulating layer separating the bath from the thermostat. All covered with wooden case.

Construction of a laboratory bath

Laboratory bath
Laboratory Bath
The first thing you need to do is to cut and collect the body for a bath. Make cuts under the thermostat, wire, fuse. Now you need to glue our heating elements. More precisely, it is desirable to spread the surface of the thermopaste element (you can buy it from a store where computers are sold), for good heat transfer. And stick it all with several layers of thermally insulating material (buy at the hardware store).
Laboratory bath
Laboratory bath
Laboratory bath
We insert everything into the body. After assembling the structure, we fill the large gaps with filler, forming smooth edges. In the role of filler can be automotive sealant, epoxy resin. I used acrylic filler.
Laboratory bathLaboratory bathLaboratory bath
We connect all the electronics. Heaters are connected in parallel to the thermostat. The thermostat sensor comes out through the connector, but you can do without it, in the sense without a connector, and not without a sensor. Power switch in series with a fuse and a thermostat. Install all the elements, assemble the circuit.
Laboratory bath
Laboratory bath
Laboratory bath
Laboratory bath
Laboratory bath
Laboratory bath
Laboratory bath
We close the bath with the bottom cover.

Painting.

Laboratory bath
Laboratory bath
Laboratory bath
I painted two layers of quick-drying black extra enamel.

Check.

Pour water. Connect the network. We connect the sensor and lower it into the water. Set the temperature and wait until the water warms up. As the water heats up to the set temperature, the thermostat must turn off the elements. This will be seen - the LED on the thermostat will go out. Everything: it means our laboratory bath is operational.
Laboratory bathLaboratory bathLaboratory bath
Modernization of the device: You can add a bath with a timer so that, for example, the drying of bulk substances lasts a certain time.
Successful homemade to you! Thank you for your attention.


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