This product is manufactured in Japanese standards. Please check the specification before you order., TBL13FC (for oil) is not explosion-proof construction. Please use based on related laws and regulations.
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It was adopted for pump ON and OFF at draining. The relay is a simple structure for turning on and off the microswitch by buoyancy, and if it is less than the allowable current value of the microswitch, load control can be done directly with this relay so it is simple. The weight that utilizes buoyancy can be arbitrarily adjusted with strings on the lower side and the upper side, so it only determines the position according to the depth of the tank. As for the improvement plan, it is easier to make the adjustment by making a hole through the center of the weight attached to the upper surface of the two weights so that the weight can be fixed to an arbitrary position. This time the string was positioned outside the weight and positioned, so the string is not connected individually as shown in the illustration of the manual. If you have such a simple structure I think that you can lower the price a little more.