FOXBORO P0923NG Intelligent Differential Pressure Transmitter

FOXBORO P0923NG Intelligent Differential Pressure Transmitter

Product Overview

The FOXBORO P0923NG intelligent differential pressure transmitter is a high-precision measurement device launched by FOXBORO Corporation in the field of industrial process control. It is designed specifically for measuring differential pressure, pressure, and liquid level parameters of liquids, gases, steam, and other media. As the "perception core" of process control, this transmitter adopts digital sensor technology and intelligent signal processing algorithms, which can accurately convert on-site differential pressure signals into standardized electrical or digital signals, and upload them to the control system in real time, providing reliable data support for monitoring, regulation, and safety assurance of the production process.

Compared to traditional transmitters in the same series (such as P0923CG), P0923NG has achieved comprehensive upgrades in measurement accuracy, anti-interference ability, and intelligent functions. It has core advantages such as remote configuration, self diagnosis, and temperature and pressure compensation, and can adapt to harsh working conditions in multiple industries such as petrochemicals, power energy, and municipal environmental protection. It is the mainstream benchmark product in FOXBORO's process measurement product line.

Specification parameters

Measurement range

Differential pressure: 0-1kPa to 0-10MPa; Gauge pressure: 0-2kPa to 0-15MPa; Absolute pressure: 0-5kPa to 0-20MPa

measurement accuracy

± 0.075% FS (standard range), ± 0.1% FS (extended range), long-term stability ≤ ± 0.1% FS/year

output signal

4-20mA DC+HART 7.0 protocol; Optional PROFINET/Modbus RTU digital communication

power supply

12-45V DC， Typical power consumption: 4mA@24V DC (without load)

environmental adaptability

Working temperature: -40 ℃~+85 ℃; Storage temperature: -40 ℃~+100 ℃; Relative humidity: 0-100% (including condensation)

Protection and Explosion proof Rating

Protection level IP67; Explosion proof rating: Ex d IIB T6 Ga/Ex ia IIB T6 Ga (dual explosion-proof rating optional)

wetted material

Diaphragm: 316L stainless steel/Hastelloy C-276; Flange: 316L stainless steel; Sealing element: Fluororubber/Viton

turndown ratio

100:1 wide range ratio, supports free range migration (positive migration ≤ 500% FS, negative migration ≥ -100% FS)

response time

0.1-10s adjustable, minimum response time 0.1s (fast measurement mode)

certification standard

Compliant with IEC 61508 (SIL 2), ANSI/ISA 100.11a standards, certified by CE, UL, ATEX

Performance characteristics

-Ultra high precision measurement: using silicon resonant sensors and digital temperature compensation algorithms, effectively offsetting the influence of temperature drift on measurement, maintaining an accuracy of ± 0.075% FS in the full temperature range of -40 ℃~+85 ℃, and a wide range ratio of 100:1 can adapt to multi scene measurement needs from small differential pressure to high pressure.

-Intelligent signal processing: Equipped with a built-in 32-bit high-performance microprocessor, supporting the HART 7.0 digital communication protocol, remote configuration, parameter modification, and data reading can be achieved through a handheld or upper computer; Equipped with non-linear correction and automatic temperature and pressure compensation functions, it can directly output mass flow calculation results for media such as steam.

-Super strong environmental resistance: IP67 protection level can resist short-term immersion and dust intrusion, and the all metal shell design enhances impact and vibration resistance (can withstand 10g acceleration vibration); The wide temperature working range is suitable for extreme environments such as cold oil fields and high-temperature chemical workshops, and the liquid receiving material is compatible with acidic, alkaline, and corrosive media.

-Improve self diagnostic function: It has multi-dimensional diagnostic capabilities such as sensor faults, line short circuits, overloads, and overtravels. Fault information is uploaded in real time through the HART protocol, and the panel LED indicator light flashes to give an alarm; Support online zero/full-scale calibration, maintenance can be completed without disassembling the transmitter.

-Safe and reliable design: Dual explosion-proof levels are optional, meeting the requirements of different hazard levels such as Zone 0 and Zone 1 in chemical explosion-proof areas; Built in overvoltage protection device, which automatically cuts off the sensitive component circuit when the measured pressure exceeds 1.5 times the rated value, avoiding sensor damage; Meets SIL 2 safety standards and can be used for Safety Instrumented Systems (SIS).

-Convenient installation and adaptation: supports various installation methods such as flange, thread, and bracket, and can be flexibly selected according to on-site working conditions; The header can rotate 360 ° and flip 180 ° for easy reading at different angles; The wiring terminals are designed to prevent accidental insertion, reducing the risk of installation and wiring errors.

Working principle

The working principle of FOXBORO P0923NG intelligent differential pressure transmitter is based on the conversion link of "physical quantity electrical signal digital signal standardized output", which is divided into four core links:

1. Differential pressure signal acquisition: The high and low pressure ends of the measured medium are respectively applied to the double diaphragm of the transmitter. After sensing the pressure difference, the diaphragm undergoes slight deformation, which drives the resonant frequency of the internal silicon resonant sensor to change - the larger the differential pressure, the greater the resonant frequency offset, achieving a linear correlation between differential pressure and frequency.

2. Signal conversion and amplification: The built-in oscillation circuit of the sensor converts the resonant frequency into an electrical signal, which is amplified by a preamplifier circuit and sent to a 32-bit microprocessor; At the same time, the temperature sensor collects real-time environmental temperature and medium temperature, and synchronously transmits temperature data to the processor.

3. Intelligent data processing: The microprocessor calls built-in algorithms and combines temperature data to perform temperature compensation and nonlinear correction on frequency signals, eliminating environmental interference; If the temperature and pressure compensation function is enabled, the actual differential pressure value or medium flow rate after compensation will be calculated based on the static pressure data collected by the pressure sensor.

4. Signal output and communication: The processed digital signal is divided into two outputs. One is converted into a 4-20mA standard analog signal for the control system to collect, and the other is used to achieve bidirectional communication with the upper computer through the HART protocol - it can upload measurement data and fault information, as well as receive remote configuration instructions (such as modifying the range and calibrating the zero point).

Precautions

This equipment is used for measuring key parameters in industrial processes, which directly affects production safety. Installation, commissioning, and maintenance must be completed by professionals with industrial instrument operation qualifications. Explosion proof area operations must strictly comply with explosion-proof safety regulations.

-Pre installation inspection: Confirm that the transmitter model, range, and explosion-proof level are consistent with the on-site requirements before installation; Check if the casing is damaged and if there are scratches on the membrane. Use a handheld device to connect and test the communication function and zero output to ensure that the equipment is in good condition; Check the compatibility between the liquid receiving material and the tested medium to avoid corrosion damage.

-Installation specifications: Avoid installing near strong electromagnetic interference sources (such as frequency converters, high-voltage cables). If it is impossible to stay away, a metal shielding cover should be installed; When measuring steam or high-temperature media, a condenser ring should be installed to prevent high temperatures from directly affecting the transmitter; Ensure that the membrane is in a horizontal position during horizontal installation to reduce the impact of gravity.

-Wiring and configuration: Wiring must be carried out in a power-off state, and the positive and negative poles of the power supply and the signal line must not be reversed; Explosion proof area wiring requires the use of explosion-proof sealed joints to ensure that the wiring chamber is sealed properly; Before the first use, the range setting, unit selection, and compensation parameter configuration need to be completed through a handheld device, and zero calibration should be performed after configuration.

-Operation and maintenance: Regularly (recommended every 6 months) check the installation tightness of the transmitter, whether the wiring is loose, and wipe the glass of the meter head with a soft cloth to keep the reading clear; After measuring corrosive media, if it is not used for a long time, rinse the liquid receiving chamber with clean water to avoid residual media corroding the diaphragm; The recommended calibration cycle is no more than 1 year, and calibration requires the use of a standard pressure source.

-Explosion proof safety: It is strictly prohibited to disassemble the transmitter housing with electricity in the explosion-proof area; When replacing parts, original explosion-proof accessories must be used, as non original accessories may damage the explosion-proof performance; When scratches or rust are found on the explosion-proof surface, it is necessary to promptly contact professional personnel for handling to avoid a decrease in the explosion-proof level.

-Storage and transportation: Uninstalled transmitters should be stored in a dry and ventilated environment, avoiding direct sunlight and severe vibration. The storage temperature should be -40 ℃~+100 ℃; The original packaging shall be used during transportation, and buffering foam shall be added to prevent sensor damage caused by collision. Stacking is strictly prohibited.