Magnetic Type Level Indicator

Magnetic Type Level Indicator , 

Bicolor level Gauge

Bicolor level Gauge is used for indication of condensate water and steam levels on high pressure boiler steam drums.

Bicolor Level Gauge indicates water (lower part) in green and steam (upper part) in red.

This instrument consists of a stainless steel body which has a trapezoid cross section , two glass sets in front and back of  the body, a bicolor filter and an illuminator behind the back glass.

The glass faces are not paraellel bacause of trapezoid cross section of the body ,

A red and green filter is located behind the back glass the converts the illuminator light into red and green light rays.

Red rays and green rays have different index of refraction when passing obliquely through glass, water and steam.

Product name	Magnetic type level indicator
Material	Stainless steel
Measuring range	300- 15000 mm
Working pressure	1.0-32 M pa
Ratio of medium	≥0.42g/cm3
Viscosity	≤0.02Pa.S
Output	4-20mA/2Wire Hart
Brand	ExiaIl CT4-T6 EX6 II CT4-T6

 

In lower part where water condensate is accumulated , the red rays are deviated, and because of non- parallel glasses could not pass through the front glass, but green rays can reach the front glass, therefore the observer sees this part of level gauge in green.

In upper part wheree contains steam, conversely the green rays are deviated and could not pass through the front glass, but red rays pass throught the front glass, and this part of level gauge is obverved in red. 

Because of high temperature, front and back glasses are protected by mica shield.

Because bicolor level gauge is used for high pressure boiler steam drums, it should be designed in accordance with ASME BOILER AND PRESSURE VESSEL CODE -SETC,I. standard.

Bicolor level gauge illuminator should be suitable for the hazardous area classification of the installation area.

 

Level Gauge Valves

Glass level gauge is connected to the vessel or tank with two cock valves at top and bottom of the level gauge 

Cock valve is an angle valve that the angle between the inlet and outlet of the valve is 90 deg.

The outlet of the cock valve which is connected to the vessel nozzle is usually flanged.

Cock valve connection to the level gauge is normally 1/2'' or 3/4'' NPTF thread connection, but 3/4'' NPTF is preferred due to blocking risk reduction. 

The top cock valve has another 1/2'' connection for vent plug or vent valve .

Similarly, the bottom cock valve has a  1/2'' connection for drawin plug or drain valve. 

Using plug for vent / drain is an economical solution, but after years of operation and maintenance it bacomes the level gauge and vessel weak pint and leakage source.

Therefore, it is recommended to select 1/2'' vent / drawin valve instead of plug .

Cock valve should be offset type in which the valve stem has an offset to the gauge body axis in order to allow galss cleaning with bottle brush without opening the cock valve and removing the level gauge .

But the offset could be left-haded or right -handed which needs to be defined before order in data sheet, considering the level gauge nozzles location on the vessel and the access point of ladder ocation.

Also , if the top cock valve is a right handed offset valve, then the bottom cock valve should be left-handed offset valve.

This problem could be solved by selecting a rotatable head cock valve which could be installed at left side or right side of the gauge body during installation . 

 

 

 

 

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