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Differential Pressure Transmitters for Liquid

The differential pressure transmitter the measuring range is -20MPA to +20MPA, the differential pressure range should not exceed 1000 Pa, and the measuring medium is fluid. The working temperature is 80 degrees Celsius. Media Temperature up to 220  °C (added with flanges and drainage pipes for heat dissipation). The Pressure accuracy is capable of customization from 0.05% to 0.2%.

LEFOO differential pressure transmitters apply oil-filled mono silicon technology that with excellent accuracy and ultra stability for industrial production and municipal projects. LEFOO is the most reliable manufacturing expert of the top differential pressure transmitter suppliers. LEFOO sales team is making its best to serve customers with the best service high-quality differential pressure transmitter with ideal communication and fast delivery, Contact us today to get the best differential pressure transmitter price.


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Specification of Differential Pressure Transmitter


Product Parameter
GeneralDescription or Value
LF811LF811 Differential Pressure Transmitter
Code 1Measuring range
B0.2~6 KPa
C1.0~40KPa
D2.5~250KPa
E10~1000KPa
F30~3000KPa
Code 2Output
EStandard intelligent (4~20) mA DC two-wire system + HART protocol digital
communication
JStandard intelligent (4-20) mA DC two-wire system + HART protocol digital
communication + square signal output
Code 3Isolation diaphragm
22316L Stainless steel
23Hastelloy C
24Monel
25Tantalum
Code 4Filling fluid
DSilicone oil
FFluorine oil
Code 5Electrical Interface
MM20×1.5internal thread
N1/2NPTinternal thread
Code 6Relief valve position
ANo relief valve (with plug)
BUpperside of process flange
CThe lower part of the process flange side
Code 7Mounting brackets
NWithout mounting bracket
B1Tube bending bracket (carbon steel)
B2Panel mounting bracket (carbon steel)
B3Tube mounted flat bracket (carbon steel)
B5Tube bending bracket (stainless steel)
B6Pan-mounted curved bracket (stainless steel)
B7Tube mounted flat bracket (stainless steel)
Code 8Static pressure
A10MPa
B16Mpa
C20MPa
Code 9Explosion-proof grade
NCommon type (no explosion-proof)
DFlameproof ExdⅡCT6
IIntrinsically safe explosion-proof type ExiaⅡCT6
Code 10Accuracy class
20.2 %FSO
70.075 %FSO
60.065 %FSO
80.05 %FSO


Optional  Description
CodeDescription
NWith "waist" shaped joint: NPT1/2 taper pipe internal thread
JWith "T" shaped joint: M20×1.5 external thread and welding pressure tube (stainless steel) at the rear
FWith "waist" shaped joint plus NPT1/2 pressure transfer head and back welding pressure tube (stainless steel)
PNo process connection (l/4 NPT female thread on chamber flange)
KDegreasing and washing treatment
LHanging tag
HLightning protection (transient voltage resistance)
EEnglish nameplate
V3Three valve group
V5Five valve group
M5LCD liquid crystal display
NNo header




Electromagnetic compatibility schedule

No.

Test items

Basic standard

Test Conditions

Performance level

1

Radiation interference (housing)

GB/T 9254-2008  Table 5

30MHz~1000MHz

Qualified

2

Conducted interference

(DC power port)

GB/T 9254-2008 Table1

0.15MHz~30MHz

Qualified

3

Electrostatic discharge (ESD) immunity

GB/T 17626.2-2006

4kV(Contact)

8kV(Air)

B

4

RF electromagnetic field immunity

GB/T 17626.3-2006

10V/m (80MHz~1GHz)

A

5

Power frequency magnetic field immunity

GB/T 17626.8-2006

30A/m

A

6

Electrical fast transient pulse group immunity

GB/T 17626.4-2008

2kV(5/50ns,5kHz)

B

7

Surge immunity

GB/T 17626.5-2008

1kV(Between lines)

2kV(Between line and ground)(1.2us/50us)

B

8

RF field induced conducted interference immunity

GB/T 17626.6-2008

3V(150KHz~80MHz)

A



Standard 


(Adjust the range based on the standard zero points, stainless steel 316L diaphragm, filling fluid is silicone oil

 

1Performance specifications 

adjust the reference accuracy of the range (Including linearity, hysteresis, and repeatability from zero

± 0.05%

If TF>10 (TF=Maximum range/adjustment range) then

±(0.005×TF)%

The square root output accuracy is 1.5 times the above linear reference accuracy

Optional price cut version = accuracy 0.2% FSO.




Environmental temperature influence
Range-20℃~70℃ Total influence
A±(0.20×TF+0.10)%×Span
B±(0.10×TF+0.10)%×Span
C/D/E±(0.05×TF+0.10)%×Span
Range -40℃~-20℃ and 70℃~85℃Total influence
A±(0.20×TF+0.10)%×Span
B±(0.10×TF+0.10)%×Span
C/D/E/F±(0.05×TF+0.10)%×Span


 

Other Influences
Range CodeOverPressure Influence Long Term InfluenceStatic Pressure Influence
A±0.2%×Span/4MPa  ±0.2%×Span/1year±(0.15%URL+0.10%Span)/4MPa
B±0.2%×Span/16MPa  ±0.2%×Span/1year±(0.10%URL+0.075%Span)/16MPa
C/D/E/F±0.1%×Span/16MPa  ±0.1%×Span/1year±(0.05%URL+0.05%Span)/16MPa


Power influence: ±0.001% /10V (12~42V DC),Negligible.                    



Functional specifications

Range/Scope

KPa

mbar

A

Range

0.2~1

2~10

Scope

-1~1

-10~10

B

Range

0.2~6

2~60

Scope

-6~6

-60~60

C

Range

0.4~40

4~400

Scope

-40~40

-400~400

D

Range

2.5~250

25~2500

Scope

-250~250

-2500~2500

E

Range

10~1000

0.1~10 bar

Scope

-500~1000

-5~10bar

F

Range

30~3000

0.3~30 bar

Scope

-500~3000

-5~30bar



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