Differential pressure transmitter / SM39PWB-DFL single flange differential pressure transmitter

1. application

The diaphragm box of the single flange differential pressure transmitter is used to prevent the medium in the pipeline from directly entering the pressure sensor component of the differential pressure transmitter. Silicone oil and other filling liquids are used to transmit pressure between it and the transmitter.

SM39PWB-DFL single flange differential pressure transmitter is used to measure the level, density, pressure, and flow of liquid, gas or steam, and then convert it into 4mA~20mADC HART current signal output. It can also communicate with HART handheld devices to set parameters and monitor processes. The measurement range of SM39PWB-DFL single flange differential pressure transmitter (when not migrated) is 0...1kPa~2MPa, and the rated pressure of single flange is: 1.6/4MPa, 6.4MPa, 10MPa, 150psi, 300psi or 600psi.

2. Working principle and structure

The SM39PWB-DFL single flange differential pressure transmitter is composed of the SM39PWB-CY series differential pressure transmitter and a single flange installed by welding. Its working principle is the same as that of the SM39PWB-CY series differential pressure transmitter, but the pressure transmission path on the positive pressure side is slightly different: the pressure acting on the high pressure side first passes through the diaphragm and filling liquid on the single flange, and then through the transmitter body to reach the high pressure side of the measuring sensor.

       3. Input

Measurement parameters Differential pressure, liquid levelMeasuring range

Lower limit: -100%URL (continuously adjustable) Upper limit: +100%URL (continuously adjustable) Range

Table 1 Comparison table of range codes and ranges

Table 2 Comparison table of single flange and minimum measuring range

The minimum range of the differential pressure level transmitter should be the larger value of the minimum range in Table 1 and Table 2. The adjusted range shall not be less than the minimum range. The maximum range of the level transmitter should be the minimum of the maximum range of the transmitter body and the rated pressure of the single flange.

4. Output

Output signal

Two-wire system, 4mA~20mADC HART output, digital communication, HART protocol is loaded on 4mA~20mADC signal.

Output signal limit: Imin=3.9mA, Imax=20.5mA

5. Response time

The damping constant of the amplifier component is 0.1s; the time constant of the sensor and single flange is 0.2s to 2s, depending on the range and range ratio. The additional adjustable time constant is: 0.1s to 60s. The additional adjustable time constant is: 0.1s to 60s.

6. General conditions

1. 1. Installation conditions

The transmitter can be fixed directly in any position with a single flange. The best condition is to keep the process flange axis vertical, and position deviation will produce a correctable zero offset. The electronic housing can be rotated up to 360° and the set screws can fix it in any position.

1. 2. Environmental conditions

Ambient temperature

Minimum: Depends on filling fluid Maximum: 85°C

LCD display, fluororubber seal -20℃～65℃ Storage temperature/transportation temperature

Minimum: Depends on filling fluid Maximum: 85°C

Relative humidity

0%～100%

Shock resistance

Acceleration: 50g

Duration: 11ms Vibration resistance

2g to 500Hz Electromagnetic compatibility (EMC)

See Table 3 "Electromagnetic Compatibility Appendix" on the next page

1. 3. Process medium limit

Medium temperature limit: -30℃～180℃

The pressure limit of the transmitter body is from 3.5kPa absolute pressure to the rated pressure. The protection pressure can be greater than 1.5 times the rated pressure and is applied to both sides of the transmitter at the same time.

 Single flange pressure rating

ANSI standard: 150psi～600psi DIN standard: PN 1.6MPa～PN 10MPa

One-way overload limit

The low-pressure side is rated for the transmitter body, the high-pressure side is rated for the single flange, and a correctable zero shift may occur.   weight

DN 50/2″ is about 7 to 10kg; DN 80/3″ is about 8 to 11kg; DN 4″ is about 9 to 12kg.Explosion-proof performance

NEPSI explosion-proof license: Ex dⅡC T6 NEPSI intrinsic safety license: Ex iaⅡC T4 Allowable operating temperature: -40℃～65℃

1. 4. Power supply and load conditions

The power supply voltage is 24V R≤(Us-12V)/Imax kΩ where Imax=23 mA

Maximum power supply voltage: 42VDC

Minimum power supply voltage: 12VDC, 15VDC (backlit LCD display)

Digital communication load range: 230Ω～600Ω Material

Measuring membrane box: stainless steel 316L

Diaphragm: Stainless steel 316L, Hastelloy C, Tantalum, FEP, PFA, PTFE Covered process flange: Stainless steel 304

Filling fluid: Silicone oil, vegetable oil

Sealing ring: Nitrile rubber (NBR), fluororubber (FKM), polytetrafluoroethylene (PTFE)

Transmitter housing: Aluminum alloy, with epoxy resin sprayed on the surface Housing seal: Nitrile rubber (NBR)

Nameplate: Stainless steel 304 Electrical Connections

M20×1.5 cable gland, terminal block is suitable for wires of 0.5mm2~2.5mm2.

Process connection

The transmitter has a UNF 7/16" internal thread on the low pressure side. The single flange on the high pressure side of the transmitter complies with ANSI or DIN standards. It can be directly installed, refer to the dimensional drawing.

Enclosure protection gradeIP67

Table 3 Electromagnetic compatibility appendix

Note 1: A performance level description: When tested, performance is normal within the technical specification limits.

Note 2: Description of performance level B: During the test, the function or performance is temporarily reduced or lost, but it can recover by itself, and the actual operating status, storage and data are not changed.

Dimensions

Unit is mm

Note: Users can choose mounting bolts and nuts.

Low Pressure Process Connection Instructions

1. Model and specification code table[1]
2. Liquid contact sealLT- Single flange, no capillary positive pressure ○ + side Process connection Nominal diameter Sealing surface type Diaphragm / Sealing surface material ADN50DIN2501E type DN2526 stainless steel 316L BDN50DIN2501E type DN2526 Hastelloy C CDN50DIN2501E type DN2526 Tantalum HDN80DIN2501E type DN2526 stainless steel 316L IDN80DIN2501E type DN2526 Hastelloy C GDN80DIN2501E type DN2526 Tantalum DDN2″ANSI B 16.5RF type ANSI B 16.5 stainless steel 316L EDN2″ANSI B 16.5RF type ANSI B 16.5 Hastelloy C FDN2″ANSI B 16.5RF type ANSI B 16.5 Tantalum KDN3″ANSI B 16.5RF Type ANSI B 16.5 stainless steel 316L LDN3″ANSI B 16.5RF Type ANSI B 16.5 Hastelloy C MDN3″ANSI B 16.5RF Type ANSI B 16.5 Tantalum NDN4″ANSI B 16.5RF Type ANSI B 16.5 stainless steel 316L ODN4″ANSI B 16.5RF Type ANSI B 16.5 Hastelloy C PDN4″ANSI B 16.5RF Type ANSI B 16.5 Tantalum Rated pressure Pressure level Flange pressure standard 1PN 1.6MPa/4MPaDIN2501 2PN 6.4MPaDIN2501 3PN 10MPaDIN2501 6150psiANSI B 16.5 7300psiANSI B 16.5 8600psiANSI B 16.5 (not included) DN4″ANSI B 16.5) Code Connection type F flat type H plug-in type, stainless steel 316L, insertion length 50mm I plug-in type, stainless steel 316L, insertion length 100mm G plug-in type, stainless steel 316L, insertion length 150mm L plug-in type, Hastelloy C, insertion length 50mm M plug-in type, Hastelloy C, insertion length 100mm N plug-in type, Hastelloy C, insertion length 150mm Code Filling fluid S Silicone oil -30℃～200℃ V Vegetable oil 0℃～250℃ Code Wetted flange diaphragm surface type N None 1 316L coated with FEP (fluorinated ethylene propylene copolymer) (temperature ≤180℃) 2 316L coated with PFA (perfluoroalkyl) (temperature ≤260℃) 3 Diaphragm with PTFE membrane (polytetrafluoroethylene membrane)[2] (temperature ≤200℃)       

Note 1: When selecting a single flange sealing device, you should first complete the selection of the SM39PWB-CY differential pressure transmitter;

Note 2: The diaphragm with PTFE membrane, that is, F4 diaphragm, can be used for negative pressure measurement, but is only suitable for flat single flange.

Note 3: For differential pressure transmitter options, see the SM39PWB-CY series transmitter option table;

Note 4: The minimum range of the level transmitter should be the larger value of the minimum range in Table 1 and Table 2. The adjusted range shall not be less than the minimum range. In order to make the performance of the differential pressure transmitter stable, the range ratio should be selected to be less than 10:1.

Note 5: When the measured pressure or working static pressure is less than 50kPa (absolute pressure), special remarks should be made and special treatment is required during the manufacturing process to ensure performance.