Resistive Level Measurement LR
?Continuus Level Monitors ?Float Level Monitors(continuous or step signal output)
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詳情介紹
MODEL: LR200S, LR200V, LR210S, LR210V, LR520S, LR520V, LR522S, LR522V, LR510S, LR510V, LR512S, LR512V
Main application
Pressure vessels or chemical tanks such as hydraulic acid or sulfuric acid.
Main feature
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Insensitive to process conditions such as pressure, temperature and specific gravity.
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Versatile and easy-to-use controller. (MP2000)
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Analog output (2 wire, 4 to 20mA DC) available as standard.
Principle of operation
LR is comprised of a float and a stem. The float has a magnet inside. The stem incorporates a circuit board with reed switches and resistors placed at regular intervals.
For a rising level, float location and reed switches in operation change as shown in Fig.1, from A(2 switches in operation) to B (3 switches in operation), and then to C (2 switches in operation). For a falling level, from C to B, then to A.
This means that the combined resistance changes as the float rises or falls. When constant current is applied to terminals 1 and 2 in Fig.2, a voltage proportional to the combined resistance is gained on these terminals.
Fig. 1: Operation of float and reed switches
Fig. 2: Circuit in the stem