JPS57162004A - Liquid level controlling system in liquid nitrogen vessel - Google Patents
Liquid level controlling system in liquid nitrogen vesselInfo
- Publication number
- JPS57162004A JPS57162004A JP4750981A JP4750981A JPS57162004A JP S57162004 A JPS57162004 A JP S57162004A JP 4750981 A JP4750981 A JP 4750981A JP 4750981 A JP4750981 A JP 4750981A JP S57162004 A JPS57162004 A JP S57162004A
- Authority
- JP
- Japan
- Prior art keywords
- resistances
- valve
- bridge
- liquid
- liquid level
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D9/00—Level control, e.g. controlling quantity of material stored in vessel
- G05D9/12—Level control, e.g. controlling quantity of material stored in vessel characterised by the use of electric means
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Control Of Non-Electrical Variables (AREA)
Abstract
PURPOSE:To automatically control a liquid level in a liquid nitrogen vessel, by incorporating 2 carbon resistances into a bridge, changing a variation of a resistance value to an output of the bridge, and controlling opening and closing of a valve by positive and negative of this output. CONSTITUTION:To a vessel 1, liquid nitrogen is supplied through a feed pipe 2, and the pipe 2 is provided with an automatic valve 3 for intermitting its supply automatically. This valve 3 is opened and closed by a valve automatic controller 4. In this state, carbon resistances RU, RL are incorporated in a bridge B together with resistances R1, R2, and when the liquid level is within the allowable liquid surface level, the product of resistances values of the resistances RL, RU becomes equal to the product of resistance values of the resistances R1, R2. An output terminal of this bridge B is connected to an input terminal of a controlling circuit 6, and the valve 3 is controlled by a control signal of the circuit 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4750981A JPS57162004A (en) | 1981-03-31 | 1981-03-31 | Liquid level controlling system in liquid nitrogen vessel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4750981A JPS57162004A (en) | 1981-03-31 | 1981-03-31 | Liquid level controlling system in liquid nitrogen vessel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS57162004A true JPS57162004A (en) | 1982-10-05 |
Family
ID=12777073
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4750981A Pending JPS57162004A (en) | 1981-03-31 | 1981-03-31 | Liquid level controlling system in liquid nitrogen vessel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57162004A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63192808U (en) * | 1987-05-28 | 1988-12-12 | ||
| US5293896A (en) * | 1989-12-11 | 1994-03-15 | Balzers Aktiengesellschaft | Arrangement for measuring the level of liquified gases |
| CN104820444A (en) * | 2015-03-11 | 2015-08-05 | 深圳市华星光电技术有限公司 | Liquid nitrogen liquid level monitoring system |
-
1981
- 1981-03-31 JP JP4750981A patent/JPS57162004A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63192808U (en) * | 1987-05-28 | 1988-12-12 | ||
| US5293896A (en) * | 1989-12-11 | 1994-03-15 | Balzers Aktiengesellschaft | Arrangement for measuring the level of liquified gases |
| CN104820444A (en) * | 2015-03-11 | 2015-08-05 | 深圳市华星光电技术有限公司 | Liquid nitrogen liquid level monitoring system |
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