INDUSTRY APPLICATION

Installation conditions for glass plate level gauges

A glass plate level gauge is a level measuring instrument based on the principle of communicating vessels, widely used for direct indication of liquid levels in containers such as towers, tanks, troughs, and boxes. To ensure accurate measurement, safe operation, and extended service life, the following conditions and requirements must be strictly observed during installation.

glass plate level gauge

I. Preparation and Location Selection Before Installation

Before installation, carefully check whether the center distance of the level gauge, flange specifications, and container interface are consistent, and confirm that the center of the container's outlet pipe and the flange end face are in the same vertical plane. If there is any deviation, it must be corrected immediately. The installation location should be chosen in a place that is convenient for operators to observe and disassemble for daily maintenance; at the same time, it should be far away from the liquid inlet and outlet to avoid interference from liquid flow impact and liquid surface fluctuations. For occasions that may be affected by high temperatures, it is not advisable to open the valve immediately after installation. It is recommended to preheat for about 30 minutes until the glass plate temperature is close to the medium temperature before slowly introducing liquid.

II. Connection and Sealing Requirements

The level gauge is connected to the container through upper and lower flanges or threaded joints, forming a communicating vessel. When connecting flanges, a gasket matching the pressure rating must be installed between the flanges. If welding is used, ensure that weld slag does not remain inside the instrument. Shut-off valves should be installed at both ends of the level gauge for easy maintenance and cleaning. When several level gauges are used in combination, it is advisable to use an external connecting pipe, which should also be equipped with shut-off valves at both ends.

III. Vertical Installation and Valve Operation

Glass plate level gauges must be installed vertically; any tilting may cause level display deviation. A level should be used for calibration during installation; the allowable vertical deviation should generally not exceed 5/1000 of the level gauge length. After installation, slowly open the upper valve (gas phase valve) first, then slowly open the lower valve (liquid phase valve) to allow the medium to enter the gauge body smoothly, avoiding rapid impact. To ensure the effective automatic sealing function of the safety ball inside the level gauge, the valve stem should be rotated at least four turns when opening the upper and lower valves.

glass plate level gauge

IV. Safety and Maintenance

The steel ball inside the glass plate level gauge automatically seals the channel under the pressure inside the container (usually greater than 0.2 MPa) in the event of accidental glass breakage, preventing liquid spillage. Avoid collisions with hard objects during installation and handling to prevent glass breakage. After commissioning, regularly check the sealing and fastener condition, and keep the glass plate clean and transparent to ensure clear readings.

Strictly adhering to the above installation conditions is fundamental to ensuring reliable operation and accurate measurement of the glass plate level gauge.

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