Extended Diaphragm Type Dual Flange Pressure Transmitter

Overview

This insertion type level transmitter is specially designed for accurate level measurement in large diameter vessels and pipelines. With an insertion probe structure, the sensing element can be directly extended into the process medium, enabling more precise and stable measurement compared to external or surface mounted solutions, especially in large volume applications.

The transmitter offers flexible and convenient installation, allowing fast mounting through flanges or other standard process connections. This installation method minimizes construction complexity and eliminates the need for extensive vessel modification, making it an ideal solution for both new installations and retrofit projects.

Featuring a remote or split type design, the probe and transmitter electronics can be installed separately. This structure effectively protects the core sensing components from high temperature, high pressure, and corrosive process conditions, significantly improving measurement reliability and extending the service life of the instrument. The robust design ensures stable long term operation in demanding industrial environments.

Thanks to its high adaptability and durable construction, the transmitter is widely used in storage tanks, reactors, pipelines, and other process equipment across chemical, petrochemical, power, and general industrial applications.

Technical Parameters

● Measured Parameters: Differential pressure, level

● Measurement Range:

• Lower Limit: Starting from -100% URL (continuously adjustable)

• Upper Limit: Up to +100% URL (continuously adjustable)

● Measurement Range：

note: “The minimum range of the remote transmitter should be the larger of the minimum ranges in Table 1 and Table 2. The adjusted range must not be less than the minimum range. The maximum range of the remote transmitter should be the smaller of the maximum range of the transmitter body and the rated pressure of the liquid flange.”

● Output Signal

2-wire, 4-20mA DC HART output, digital communication, HART protocol superimposed on the 4-20mA DC signal. Output signal limits: Imin = 3.8mA, Imax = 20.5mA

● Alarm Current (mode adjustable)

• Low alarm mode (minimum): 3.6mA

• High alarm mode (maximum): 21mA

• No alarm mode (hold): maintains the valid current value before the fault

• Standard alarm current setting: high alarm mode

● Response Time

Amplifier component damping constant is 0.1s; sensor and remote flange time constant is 0.2 to 6s, depending on the sensor range, range ratio, capillary length, and fill fluid viscosity. Additional adjustable time constant: 0.1 to 60s.

● Installation Conditions

• The transmitter body is versatile in mounting, allowing installation in any orientation.

• Ideally, position the process flange axis vertically to prevent correctable zero shifts due to position deviations.

• The housing offers 360° rotation flexibility.

• Ensure the remote flange connects to the matching flange with suitable soft gaskets, bolts, and nuts.

• Capillary bending should adhere to a minimum radius of 75mm, with no winding permitted.

• For dual flange remote transmitters, maintain consistent ambient temperature during installation of capillary components and remote flanges.

● Ambient Temperature

• Minimum: depends on the fill fluid

• Maximum: 85°C

• With LCD display and fluororubber sealing ring: -20 to 65°C

● Storage/Transportation Temperature

• Minimum: depends on the fill fluid

• Maximum: 85°C

● Relative Humidity: 0 to 100%

● Medium Temperature: -30 to 400℃

Note: Special design may be required for operating conditions beyond the specified temperature and static pressure range.

● Transmitter Body Pressure Limits:

From 3.5kPa absolute pressure up to the rated pressure; protection pressure can exceed 1.5 times the rated pressure.

● Overload Limits:

Low-pressure side is the transmitter body's rated pressure, high-pressure side is the remote flange's rated pressure, with the possibility of correctable zero drift.

● Weight:

• Single-side remote transmission:

• DN50/2": approximately 7 to 10kg

• DN80/3": approximately 8 to 11kg

• DN4": approximately 9 to 12kg

• Dual-side remote transmission:

• DN50/2": approximately 10 to 16.5kg

• DN80/3": approximately 12 to 18kg

• DN4": approximately 14 to 21kg.

● Pressure-type Remote Transmission Transmitter:

• DN50PN25: approximately 6kg

• DN80PN25: approximately 8kg

• DN100PN25: approximately 10kg

● Explosion-proof Performance:

• Explosion-proof permission: Ex d IIC T6

• Intrinsic safety permission: Exia IIC T4

● Power Supply Load Conditions:

• Power supply voltage: 24V

• R < (Us-12V)/max kΩ, where 1max = 23mA

• Maximum power supply voltage: 36VDC

• Minimum power supply voltage: 9VDC (low voltage version), 13.5VDC (backlit LCD display), LED display

● Digital Communication Load Range: 250 ~ 600Ω

● Materials:

• Measurement diaphragm box: Stainless Steel 316L

• Diaphragm: Stainless Steel 316L, Hastelloy Alloy C, Tantalum, Titanium

• Process flange: Stainless Steel 304

• Fill fluid: Silicone oil, high-temperature silicone oil, ultra-high-temperature silicone oil, vegetable oil

• Sealing ring: Nitrile rubber (NBR), Fluororubber (FKM), Polytetrafluoroethylene (PTFE)

• Transmitter housing: Aluminum alloy, surface coated with epoxy resin; Stainless Steel housing optional

• Housing sealing ring: Nitrile rubber (NBR)

• Nameplate: Stainless Steel 304

● Electrical Connection: M20×1.5 or NPT1/2 internal thread

● Process Connection: Flange

● Housing Protection Level: IP67