Buy Float and Board Type Level Indicator Mechanical Tank Water Level Indicator Top Mounted Float & Board Level Indicator/Gauge Manufacturers in China.
Float & Board type level gauge is a weighing liquid level measuring system applicable for non-pressurized storage tanks/vessels. It is basically a balanced counterweight system with an arrow shaped pointer which smoothen the indication process.

Mechanical Float Board Level Indicator and board level gauge/indicator For the measurement of level of fluids at various industrial applications level indicators are used. These devices are used to determine the level of liquid in tanks, drums. Pressure vessels etc.
It works by a float ball floating on the liquid, stainless steel rope and magnetic flappers moves with liquid level up and down.
Principle:
Direct Indication
The Float & Board Level Indicators consists of a float connected to a pointer through a rope via a set of pulleys. The pointer glides over a calibrated gauge board, positioned parallel to the tank. The float accurately follows liquid level variations in vertical direction. The horizontal float movement is as such, the pointer in ‘TOP POSITION’ when tank is ‘EMPTY’ and in ‘BOTTOM POSITION’when ‘FULL’.

Total depth of vessel	≤25m (Locally indicate can add two-wire remote transmitter)
Power supply	24VDC, output 4-20mA
Top	double flange + guide pipe + elbow slide wheel(2 ball steel wire connected counterweigh buoyancy)
Bottom	double flange + chock
Top installed with flange	ANSI, DIN, JIS, HG, GB
Float Wire Rope	2.5mm diameter
Medium density	>0.4g/cm³
Medium temp.	-20℃~350 ℃
Float material	SUS304, SS316,PP
Flange and pipe and Guiding Rope	SUS304, SS316,PP

Product installation diagram

Mechanical Float Board Level Indicator (Mechanical Tank Water Level Indicator)

Working Principle

A stainless steel float inside the tank rises and falls following liquid level changes. The mechanical linkage transfers motion out of the tank, driving the indicator slider to move along the graduated scale, directly showing real-time liquid level height.

Core Features

No power supply required

Fully mechanical structure, works normally during power outages, ideal for unattended outdoor tanks, fuel depots and water storage facilities.
Simple & reliable structure

Few vulnerable parts, strong anti-electromagnetic interference, not affected by medium conductivity, dust or steam.
Intuitive on-site reading

Clear percentage scale, operators can check level data directly from a distance.
Wide medium adaptability

Fits water, diesel, heavy oil and other neutral liquid media; stainless steel float option for mildly corrosive fluids.
Easy installation & maintenance

Mount via tank top/side flange, convenient to inspect and replace parts without complex calibration.

Main Application Scenarios

Above-ground diesel, gasoline storage tanks
Industrial water tanks, fire water pools, circulating water buffer tanks
Small chemical medium storage vessels, heating system expansion tanks

Limitations

Only local display, no standard remote signal output by default
Not suitable for highly viscous, easily crystallized media that may block float movement
Measurement accuracy will drop under severe tank vibration conditions

Installation Steps

Mount the flange assembly firmly on the top or side reserved opening of the tank, ensure sealing to avoid leakage.
Lower the float body into the tank interior, connect and fix the external connecting pipe and rocker arm linkage structure.
Install the graduated scale vertically on the outer tank wall, adjust the indicator slider to align with the actual initial liquid level.
Check that the rocker linkage moves flexibly without jamming, verify the slider can follow float lifting and dropping smoothly.
Tighten all fasteners, do a liquid level rise/fall test to confirm scale reading matches real tank level.

Mechanical Tank Water Level Indicator