FT-1000/FP-1000 FLOAT TYPE TANK GAUGES

TG-L2512-E00

2

TOKYO KEISO CO., LTD.

OPERATION PRINCIPLE

As shown in Fig. 1

The FT-1000 Series Level Gauge consists of a level detecting float,

transmitting parts (tape, guide elbow, etc.) and the instrument body.

The indicator body comprises the sprocket pulley, tape winding pul-

ley, constant torque spring, gear machanism, pointer and scale plate.

When a transmitter is provided for the level gauge, the transmitter is

connected to the sprocket pulley shaft of the indicator body through

the coupling mechanism.

The float is kept afloat on the surface of the liquid with a constant

draft line, and follows any changes in the liquid level. The float is con-

nected to a tape winding pulleythrough the stainless steel tape which

is punched at regular intervals. The constant torque spring is incorpo-

As shown in Fig. 2

In the FP-1000 Series Level Gauge, the vapor and gas in the tank

are sealed with the seal pipe and cannot get into the level gauge.

Therefore, the system is not only covenient but suitable to measure

the liquid level of tanks that contain a liquid, liquified gas or any other

high temperature liquid and that can generate poisonous, corrosive

or inflammable gases and odor. In addition, the system is excellent so

that it is non-corrosive, safe and is easy to maintain.

In the FP Series, the indicator body of the FT-1000 level gauge for

low pressue is used, and a seal pipe made of a non-magnetic ma-

Installing on the side a tank

Construction of the seal pipe and float

Fig. 2: OPERATION PRINCIPLE OF FP-1000

Local level

indicator

Seal pipe

Float (contains

main maget)

Measuring tape

Following magnet

Main magnet

Float

Bottom of tank

Bottom piece

Seal pipe

(Float guide pipe)

Float

Tank

Liquid surface

Guide elbow

Guide elbow

Measuring tape

Sprocket pulley

Gear mechanism

Pointer-scale plate

(or counter)

Constant torque spring

(Conston spring)

Coupling

Indicator body of

FT-1000 Series

Level Gauge

Tape winding pulley

Level, analog, digital

Level signal line,

Alarm singnal line

Cam

Microswitch

Upper, lower limit alarm transmitter

Analog converter/transmitter

Digital converter/transmitter

Alarm transmitter

Fig. 1: OPERATION PRINCIPLE OF FT-1000

rated in the tape winding pulley in order to apply a constant torque

in the tape winding direction. This constant torque is balanced with

the weight of the float on the surface of the liquid.

When the float rises and lowers, according to the change in the

liquid level, the tape which is interlocked with the float rotates the

sprocket pulley, which in turn is engaged with the punched tape.

The rotation corresponds to the upward or downward movement of

the float. Thus, any change in the level of the liquid is converted to

the change in the rotation angle of the sprocket pulley shaft.

This rotation angle of sprocket pulley is transferred to transmitter

unit, i. e. Microswitch alarm, pneumatic, electric, digital BCD etc.

through coupling unit for remote data transmission.

terial is inserted and fixed in the tank. The doughnut-shaped float

rises and lowers, with the aid of the seal pipe as guide, according to

the change in the liqud level. The float contains a main magnet, and

a following magnet with a sliding roller is arranged in the seal pipe.

The following magnet is connected to the local level indicator as well

as FT-1000 level gauge, by means of a measuring tape in order to

transmit the change in the liquid level; (to the level indicator, which

indicates the liquid level.) If a transmitter is equipped, the liquid level

can be transmitted to a remote control room.