Products

level meter

UQD Ball Float Level Transmitter
UQD Ball Float Level Transmitter
Summary
UQD Ball Float Level Transmitter consists of measurement part and signal controller part. According to structural features, the measurement part can be divided into 90 type with small angle, 91type with big angle, 92 type with external float. The signal controller part can be divided into analog type (UQD.A) and intelligent type (UQD.Z).They are perfect instruments for liquid level measurement in production process in petroleum, chemical, metallurgy, power industry and so on.
  • Operating Principle
  • Technical Parameter
  • Model Selection Table
  • Outline and installation
  • Ordering information
The measuring unit of UQD ball float level transmitter includes floating ball, balance lever, balance weights, these three elements comprise a torque balance device. The floating ball can float up and down freely by level changing. When the level changes, the floating ball position changes correspondingly and drive the shaft to rotate through connecting rod of the floating ball. The angular displacement sensor in the controller couples with the shaft via a pair of gears. In this way, the changes of level can be converted into electric signal that will be turned into standard current signal in direct proportion by the electronic circuit in the case.
 

Performance and technical specification

Analog Type
( transmitter head)

Intelligent Type
(transmitter head)

Supplying voltage

24V DC

Output signal

4~20mA

4~20mA+HART protocol

Accuracy class

1.5%

1.0% ; 1.5%

Local indication

Ammeter

LCD displayer

Setting methods

Local knob

Local keys;
Debugging software + PC;
Communicator

Damp time selection

Non

0-32s

Local and remote configuration

Non

Yes

Alarm for exceeding range
Diagnosis for failure

Non

Yes

Ambient temperature

-40~80℃

-30~70℃ (for LCD)

Operating temperature

-30℃≤T<225℃(without radiator)
225℃≤T≤450℃(with radiator)

Load resistance

See load chart

Diameter of the floating ball

Φ230 mm

Nominal pressure

≤6.3MPa

Nominal diameter

DN250

Flange standard

HG/T20592-2009, HG/T20615-2009 or on request

Wetted  material

Flange: carbon steel, 304 or on request;
Others should be higher than 304 or on request.

Fluid density

≥0.55g/cm3

Power supply inlet

M20*1.5 (female thread) or on request

Protection class

IP67

Explosion-proof

See the explosion-proof type chart

 

Model

Code

Code meaning

UQD

 

Ball float level transmitter

 

A

 

Analog type

Z

 

Intelligent type

 

-

 

Small angle type

 

90

 

Small angle type

91

 

Big angle type

92

 

External float type

 

A

 

Flange:DN250, PN≤2.5MPa, PN2.0MPa (class 150)

B

 

Flange: DN250, PN4.0MPa

 

C

 

Flange: DN250, PN6.3MPa, PN5.0MPa (class 300)

 

/

 

Intrinsically safe

 

i

 

Intrinsically safe

d

 

Explosion isolation

 

T

 

Flange material: Carbon steel

H

 

Flange material: 304(others as actual fill in)

 

D

Medium temperature: -30℃≤T≤+225℃(without radiator)

G

Medium temperature: +225℃<T≤+450℃ (with radiator)

UQD. □ - □ □ / □ □ □

/Range (unit is mm)

Example:
UQD.A – 90B/iTG: ordinary type electric ball float level transmitter, analog type, nominal diameter is 250, nominal pressure is 4.0MPa, intrinsically safe, flange material is carbon steel, medium temperature is +225℃<T≤+450℃, with radiator.
1. The structure and size
1.1 UQD90 ordinary type ball float level transmitter
They have simple structure with easy and convenient installation. They are suitable for working environment (or container) in which the rod is needed to be long and the range is small. The angular rotating range (angular home range ) ≤35。.
(When operating angle range is ≥8。, signal 4-20mA can be output.)

 
UQD.A-90,UQD.Z-90 Ordinary Type Outline


1.2 UQD91 big angle level transmitter
In order to solve the problem that there is no way for the transmitter working in volume limited container to increase the measuring range by being extended the length of the ball connecting rod, our company develops and manufactures 91 type big angle ball float level transmitter which maximum operating angle can reach 80。. So we resolve the problem that using short rod to accomplish big range. This technology has been granted a national patent. The patent number is ZL96 225811.3
.
Note: The max length of ball connecting rod is not longer than 1130mm.
      This type is for large inside diameter container, the max length of connecting rod must shorter than 1130mm. It is forbidden to extend the rod length at will to increase the measuring range.
The min inside diameter of container should not less than 400mm.
Here we remind our customer that the limit length of the ball connecting rod is 400mm. The reason of setting the container inside diameter is to note customer whose container inside diameter is small.

 
1.3 UQD92 external float level transmitter
92 external float level transmitter has the same measuring unit and transmission unit as 90 ordinary float level transmitter. The difference is: for external float level transmitter, adding an external measuring chamber that connects the fluid container through pipeline. So the fluid can flow into the external measuring chamber with same liquid level as the level inside the container so that the level can be measured. This type transmitter is suitable to the measurement that the level is not convenient or difficult to be measured inside the container. Valve can be assembled between external measuring chamber and container, so it will be convenient for checking and maintaining.
 

 
Note: Flange A is to connect with equipment, DN 40, PN4.0 or DN6.3MPa JB/TB82.2-94 raised face flange or as request. The support for the measuring chamber should be equipped by users themselves.

 
2.  Load characteristic chart

3.  Safety barrier recommendation table

Model

Code

Code meaning

UQD

 

Ball float level transmitter

 

A

 

Analog type

Z

 

Intelligent type

 

-

 

Small angle type

 

90

 

Small angle type

91

 

Big angle type

92

 

External float type

 

A

 

Flange:DN250, PN≤2.5MPa, PN2.0MPa (class 150)

B

 

Flange: DN250, PN4.0MPa

 

C

 

Flange: DN250, PN6.3MPa, PN5.0MPa (class 300)

 

/

 

Intrinsically safe

 

i

 

Intrinsically safe

d

 

Explosion isolation

 

T

 

Flange material: Carbon steel

H

 

Flange material: 304(others as actual fill in)

 

D

Medium temperature: -30℃≤T≤+225℃(without radiator)

G

Medium temperature: +225℃<T≤+450℃ (with radiator)

UQD.   □ -   □   □ /   □  □  □

/Range (unit is mm)

 

UQD.A Safety barrier recommendation table

Shanghai I.S.Instruments & system Co.,Ltd

LS4041-Ex

Shanghai Automation Instrument Institute

GS8041-Ex, GS8045-Ex

Longfei Group Corporation in China

LF1045

British MTL Company

MTL3046B, MTL5042, MTL706+

Germany P+F Company

KFD2-STC3-Ex1

Dandong Top Electronics Instrument Co., Ltd

TP5041-Ex, TP5045-Ex

4.   Counter flange straight pipe requirement
The transmitter is mounted on the counter flange on side wall of container loaded with measured medium. The requirement of counter flange straight pipe as below pictures:
 

  


Note: if the interface length of flange on the side wall is more than above requirement, the operating angle of float rod will be affected, that is to say, measuring range can’t reach design requirement, if so, please contact with our company.

5.   Range and connecting rod length parallel table

Model

Range
(mm)

Rod length
(mm)

Min diameter
(inside diameter, mm)

UQD-90
Ordinary type

400

551

500

500

718

700

600

885

850

700

1051

1050

800

1218

1200

900

1385

1350

1000

1551

1550

1100

1718

1700

1200

1885

1850

UQD-91
Big angle type

550

313

550

600

352

600

700

430

700

800

508

750

900

585

850

1000

663

900

1100

741

1000

1200

819

1100

1300

897

1150

1400

975

1250

1500

1053

1300

1600

1131

1400

UQD-92
External float type

330

435

 

Please select product model according to the model selection table.
◆  Medium operating pressure & temperature
◆  Special wetted material brand name
◆  Tag number
◆  Flange standard
◆  Medium name & density
◆  Instrument accuracy