US 12,352,611 B2
Potassium nitrate level detection sensing module in strengthening furnace
Hyung Sup Lee, Yongin-si (KR); Yun Hoe Kim, Cheongju-si (KR); Hyun Min Kim, Cheongju-si (KR); and Hyun Yeol Yoon, Cheongju-si (KR)
Assigned to DOWOOINSYS CO., LTD., Cheongju-si (KR)
Appl. No. 18/039,412
Filed by DOWOOINSYS CO., LTD., Cheongju-si (KR)
PCT Filed Jan. 20, 2022, PCT No. PCT/KR2022/001036
§ 371(c)(1), (2) Date May 30, 2023,
PCT Pub. No. WO2022/191417, PCT Pub. Date Sep. 15, 2022.
Claims priority of application No. 10-2021-0031830 (KR), filed on Mar. 11, 2021.
Prior Publication US 2024/0133728 A1, Apr. 25, 2024
Prior Publication US 2024/0230391 A9, Jul. 11, 2024
Int. Cl. G01F 23/24 (2006.01); C03B 27/03 (2006.01); G01F 23/80 (2022.01)
CPC G01F 23/24 (2013.01) [C03B 27/03 (2013.01); G01F 23/241 (2013.01); G01F 23/243 (2013.01); G01F 23/80 (2022.01)] 2 Claims
OG exemplary drawing
 
1. A potassium nitrate level detection sensing module M in a strengthening furnace, comprising:
a level detection means C, which is installed inside a glass strengthening furnace F, installed at a height equal to a level line of strengthening liquid to be filled in the strengthening furnace F, and generates an electrical signal having a set threshold or more or an electrical signal having the set threshold or less when the level detection means C comes into contact with the strengthening liquid and detects that the strengthening liquid filled in the glass strengthening furnace F has reached a set strengthening liquid level line, wherein
the strengthening furnace F is a conductor,
the level detection means C includes
a measurement bar 200 for level detection that is installed at a height equal to the level of the strengthening liquid to be filled in the strengthening furnace F and is made of a conductor, and
a resistance measurement module 201 that measures a resistance value between the measurement bar 200 for level detection and the strengthening furnace F,
the resistance measurement module 201 includes
a constant current supply unit 202 that supplies a constant current to the measurement bar 200 for level detection,
a constant current measurement unit 203 that measures a constant current value, which is input from the constant current supply unit 202 to the measurement bar 200 for level detection, in real time,
a voltage measurement unit 204 for voltage difference detection that measures a voltage difference between the measurement bar 200 for level detection and the strengthening furnace F, and
a resistance measurement unit 205 that measures resistance between the measurement bar 200 for level detection and the strengthening furnace F using a voltage difference between the measurement bar 200 for level detection and the strengthening furnace F detected by the voltage measurement unit 204 for voltage difference detection and the constant current value measured in real time by the constant current measurement unit 203, and
the voltage measurement unit 204 for voltage difference detection includes
a second signal processing unit 209 that adjusts the voltage difference between the measurement bar 200 for level detection and the strengthening furnace F within an input voltage range of an input terminal provided in a second A/D converter 210,
the second A/D converter 210 that converts an analog voltage output from the second signal processing unit 209 into digital data, and
a voltage conversion unit 211 that converts the digital data converted by the second A/D converter 210 into a voltage.