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SMT3151LT Liquid Level (pressure/differential Pressure) Transmitter

The liquid level (pressure/differential pressure) transmitter is a pressure signal measured at the reference side of atmospheric pressure (low pressure side), with one or two ports for flange (or other connection) and process pipe connection. Working principle: On the basis of common pressure/differential pressure transmitter, one or two isolation membrane boxes are added to measure the liquid receiving part.Mainly used for measuring high temperature, easy to solidify or crystallize, containing solid suspended matter, too viscous, corrosive or other needs to maintain sanitary conditions, non-polluting media.
Product Details:


SMT3151LT liquid level (pressure/differential pressure) transmitter


Description

The liquid level (pressure/differential pressure) transmitter is a pressure signal measured at the reference side of atmospheric pressure (low pressure side), with one or two ports for flange (or other connection) and process pipe connection.

Working principle:

On the basis of common pressure/differential pressure transmitter, one or two isolation membrane boxes are added to measure the liquid receiving part.Mainly used for measuring high temperature, easy to solidify or crystallize, containing solid suspended matter, too viscous, corrosive or other needs to maintain sanitary conditions, non-polluting media. 

The basic measurement element is the same as the technical performance and technical index of the 3151 pressure/differential pressure transmitter. After adding the remote transmission device, there will be a small decrease in measurement accuracy, slow reaction speed, and the installation position should be paid attention to when the pressure is relatively small, so as to ensure that the measured pressure is within the measurement range of the basic measurement element.

3151LT Flange Specification Sheet

Common flange flush type specifications are as follows:

DN50(2 ") flange dimension specification sheet

Flange standard

B

C

E

A

Number of bolts n

Bolt aperture

150LB

150

120

95

19

4

18

300LB

165

127

95

20

8

18

600LB

165

127

95

32

8

18

900LB

215

165

95

45

8

26

PN1.6/1.0

165

125

95

18

4

18

PN2.5/4.0

165

125

95

20

4

18

PN6.4

180

135

95

26

4

22

DN80(3 ") flange dimension specification sheet

Flange standard

B

C

E

A

Number of bolts n

Bolt aperture

150LB

190

152

124

20

4

18

300LB

210

168

124

25

8

22

600LB

210

168

124

38

8

22

900LB

240

191

124

54

8

26

PN1.6/1.0

200

160

124

20

8

18

PN2.5/4.0

200

160

124

24

8

18

PN6.4

215

170

124

28

8

22

DN100 (4 ") flange dimension specification sheet

Flange standard

B

C

E

A

Number of bolts n

Bolt aperture

150LB

230

190

155

24

4

18

300LB

255

200

155

32

8

22

600LB

275

215

155

45

8

26

900LB

290

235

155

50

8

33

PN1.6/1.0

200

180

155

20

8

18

PN2.5/4.0

200

190

155

24

8

22

PN6.4

215

200

155

28

8

26


DN40
Flange size specification sheet

Flange standard

B

C

E

A

Number of bolts n

Bolt aperture

PN1.6/2.5

150

110

84

18

4

18

PN2.5/4.0

150

110

84

18

4

18

PN6.4

170

125

89

26

4

22

 

Common flange insertion barrel specifications are as follows:

DN50(2 ") flange size specification sheet

Flange standard

B

C

E

F

A

Number of bolts n

Bolt aperture

150LB

150

120

95

48

19

4

18

300LB

165

127

95

48

20

8

18

600LB

165

127

95

48

32

8

18

900LB

215

165

95

48

45

8

26

PN1.6/1.0

165

125

95

48

18

4

18

PN2.5/4.0

165

125

95

48

20

4

18

PN6.4

180

135

95

48

26

4

22

 

DN80(3 ") flange size specification sheet

Flange standard

B

C

E

E

A

Number of bolts n

Bolt aperture

150LB

190

152

124

74

20

4

18

300LB

210

168

124

74

25

8

22

600LB

210

168

124

74

38

8

22

900LB

240

191

124

74

54

8

26

PN1.6/1.0

200

160

124

74

20

8

18

PN2.5/4.0

200

160

124

74

24

8

18

PN6.4

215

170

124

74

28

8

22

  

DN100(4 ") flange size specification sheet

Flange standard

B

C

E

E

A

Number of bolts n

Bolt aperture

150LB

230

190

155

89

24

4

18

300LB

255

200

155

89

32

8

22

600LB

275

215

155

89

45

8

26

900LB

290

235

155

89

50

8

33

PN1.6/1.0

200

180

155

89

20

8

18

PN2.5/4.0

200

190

155

89

24

8

22

PN6.4

215

200

155

89

28

8

26

Liquid level (pressure/differential pressure) transmitter selection specifications table

Model

Transmitter type

3151LT

Flange liquid level transmitter

Code

Scale range

4

5

6

7

0-4.040kPa(0-4004000mmH2O)

0-20200kPa(0-220mH2O)

0-70700kPa(0-770mH2O)

0-2102100kPa(0-21mH2O)

Code

Output form

E

Linear output 4-20mAdc

SF

Linear output 4-20mAdc +HART   signal

F

MODBUS-485 signal

Code

Flange standard (high pressure   side flange)

A

ANSI American Standard (HG20615)

D

DIN European Standard (HG20592)

Code

Process connection size

ANSI American Standard (HG20615)

DIN European Standard (HG20592)

25

1”

DN25

40

1.5”

DN40

50

2”

DN50

80

3”

DN80

00

4”

DN100

Code

Process connection pressure rating

ANSI American Standard (HG20615)

DIN European Standard (HG20592)

A

150LB

PN16/25

B

300LB

PN40

C

600LB

PN64

D

900LB

PN100

Code

High pressure side diaphragm

A

316 stainless steel

B

Hastelloy C

C

Monel

D

Tantalum

E

Titanium

F

Special Requirements

Code

High pressure side insert tube   length

High pressure side insert cylinder   material

A

0 mm

None

B

50 mm

316L Stainless steel

C

150 mm

316L Stainless steel

D

200 mm

316L Stainless steel

Code

High pressure side filling fluid

D

General silicone oil  -40~104

F

High temperature silicone oil   -40~304

S

Inert liquid  -40~204

Code

Low pressure side structural material

Flange   (joint)

Exhaust/drain valve

Isolation   diaphragm

Sensor   filling fluid

22

316   Stainless steel

316   Stainless steel

316   Stainless steel

Silicone oil

23

316   Stainless steel

316   Stainless steel

Hastelloy   C

Silicone oil

24

316   Stainless steel

316   Stainless steel

Monel

Silicone oil

25

316   Stainless steel

316   Stainless steel

Tantalum

Silicone oil

33

Hastelloy   C

Hastelloy   C

Hastelloy   C

 Silicone oil

35

Hastelloy   C

Hastelloy   C

Tantalum

 Silicone oil

44

Monel

Monel

Monel

 Silicone oil

S2

A remote transmission device (with   a remote transmission device on the low-voltage side)


Code

Shell material

Conduit inlet dimensions

A

Low   copper aluminum alloy polyurethane coating

M20×1.5

B

Low   copper aluminum alloy polyurethane coating

1/2-14 NPT

C

Stainless steel

M20×1.5

D

Stainless steel

1/2-14 NPT

Code

Optional parts

M1

0100%  Linear indicator head

M4

LCD multi - power digital display   head

D1

Side discharge valve at the top   (only for the low pressure side of the low pressure side without remote   transmission)

D2

Side discharge valve at the top   (only for the low pressure side of the low pressure side without remote   transmission)

Da

Flameproof  ExdIIBT5Gb;(explosion-proof certificate no.   : CE16.1163)

Fa

Intrinsically safe ExiaIICT4 / T5 / T6Ga;(explosion-proof certificate no. : CE15.2354X)

CX

With corresponding 316 flushing   ring

Selection example 3151LT4SFA50AAA22AM4Da    020kPa


Installation requirements for liquid level differential pressure transmitter

In order to accurately measure the liquid level, in addition to the correct selection and verification of the differential pressure transmitter, it must also be noted that the installation of the entire system meets the requirements. The indication value of the transmitter sometimes does not reflect the actual parameters of the measured medium, because the measurement system itself will produce errors. System installation requirements include: the opening position of the pressure tap, the proper laying of the connecting conduit, and the mounting position of the transmitter.

First of all, the pressure tap should be in a region where the fluid flow is smooth and there is no eddy current, and the process parameters should be ensured in the process. For example, when the differential pressure transmitter is used to measure the water level of the boiler drum, the actual water level of the steam drum is different in the axial and radial directions of the steam drum, generally in the axial direction, the middle water level is high, and the water level on both sides is low; The side of the lowering tube is higher on the denser side. The condenser liquid level transmitter of a power plant turbine is close to the condensate pump inlet due to the position of the measuring point. When the condensing pump is running, it causes the water surface to sink at the point of the point, which causes the transmitter to be significantly lower. The position of the measuring cylinder is moved to a distance from the inlet of the condensing pump, and the condenser water level transmitter is consistent with the actual water level indication on the spot to ensure safe and stable operation of the condenser.

Secondly, when measuring the liquid level, the differential pressure measured by the differential pressure transmitter is relatively small, generally between several kPa and 100 kPa, so the entire measurement system has a great influence on the measurement accuracy. As shown in Figure 1, when installing the pressure guiding tube, the horizontal section of the pressure guiding tube should have a certain inclination, and the inclination should be as large as possible to avoid accumulation of liquid inside the pressure guiding tube, resulting in inaccurate measurement. When the transmitter range is small, the transmitter output will fluctuate. In addition, when the transmitter is put into operation, the air bubbles in the liquid column of the pressure guiding tube should be drained as much as possible. These accumulated gases will affect the accuracy of the measurement. It is also conceivable to arrange the exhaust device at the highest point of the upper bend of the pressure guiding tube.



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