LEFOO Group WP361A Mono Crystalline Silicon Absolute Pressure Transmitter Instructions

LEFOO Group WP361A Mono Crystalline Silicon Absolute Pressure Transmitter

INSTRUCTION MANUAL

MODEL: WP361A

Adpot HART fieldbus technology, which can provide more field information to improve the performance of the factories.

Product instruction

• Adopt MEMS monocrystal silicon high-precision pressure sensor
• With high response speed and stability
• Measurement accuracy 0.075%FS
• The max. range ratio can reach to 100:1
• Adopt double overload protection technology
• With strong overload capability, the unidirectional pressure can reach to 20MPa
• Provide standard HART bus communication mode
• Sophisticated self-diagnosis and telecommunication function
• Highlighted LCD with backlight
• Local display screen which can rotate by 360º
• Convenient local zero clearing function
• Convenient local zero point, extreme point setting and calibration function
• Convenient local current loop calibration function

Advanced Manufacturing Technique

The most reliable quality experience

Product Introduction

Sensor membrane head

While working, the isolation diaphragms on the high/low-pressure sides and the filling liquids will transmit the process pressure to the membrane head of sensor and then converted into the corresponding current, voltage or digital HART® (high-speed addressable remote transmitter data highway) output signal.

WP361 series sensor can conduct temperature measurement to compensate the temperature effects.
In the characterization process of factory, all the sensors have gone through the pressure and temperature cycle test within the whole working range. The correction factors will be generated from these obtained data. Then the coefficients will be stored in the memory of intelligent board so as to ensure that the signal correction can be conducted precisely during the operational process of transmitter.

Electronic circuit board

The electronic board adopts high-performance integrated circuit and surface packaging technology. This board will correct the input signal of sensor and then conduct linear treatment. The output part of electronic board module will convert the digital signal into analog output and conduct communication with the manipulator.
The liquid crystal header can display the pressure value, current value or the percentage of range.

Data storage

The configuration data will be stored in the permanent EPROM storage of transmitter electronic board module. After the transmitter is power down, the data will be stored permanently. So after power on, the transmitter can work immediately.

Digital/analog conversion and signal transmission

The process variable is stored in the form of digital data, which can be corrected accurately and conducted the conversion of engineering units. After correcting the signal, the data will be converted into analog output signal. HART manipulator can directly access to the reading of sensor in the way of data signal so as to get higher accuracy without digital/analog conversion.

Communication format

WP361 series transmitter adopts HART protocol to conduct communication. This protocol adopts industrial standard Bell202 f r e q u e n c y s h i f t k e y i n g ( F S K ) t e c h n o l o g y. T h e telecommunication can be conducted by overlaying high-frequency signal on the analog output. By using this technology, the communication and output can be realized simultaneously without influencing the integrity of loop. WP361 series transmitter can communicate with the host machine, which uses HART protocol.

Software function

The users of HART protocol can easily use the functions of WP361 series, such as menu configuration, test and specific settings.

Configuration

By using HART manipulator, users can conveniently conduct current regulation, parameter configuration, HART information, two-point fine tuning and graphical monitoring on WP361 series menu, including:

• Zero and extreme point setting
• Engineering units selection
• Linear
• Damping time
• Display mode
• Display accuracy

HART information can input the informational data into the transmitter to identify and physically describe the transmitter, including:

• Date
• Station identification: within 8 characters
• Station description: within 16 characters
• Information: within 32 characters

Test

When the system goes wrong, if the operator confirms that the loop has faults, can let the transmitter provide specific output for loop tests.

Specific settings

In the initialization phase of transmitter and while maintaining the digital electronic board, specific settings should be conducted. It allows to conduct fine tuning on the sensor and analog output to accord with the pressure standard of the factory.

Options

Liquid crystal header

Digital header, 2-line 5-digit liquid crystal display

• Directly display the digital data, with higher accuracy
• Display the pressure, current or range percentage according to the requirements of users
• Can rotate by 360°, which is easy to install

Transient voltage resistance protection

• Integrative transient voltage resistance protection terminal
• Electromagnetic compatibility accords with the national standard:

IEC6100-4-2 Electrostatic discharge immunity test IIIB

IEC6100-4-4 Electrical fast transient pulse clusters anti-interference test IIIB

IEC6100-4-5 Surge (shock) immunity test IIIB

Specification

Performance index

The overal performance is the composition error based on the reference accuracy, ambient temperature effects and range static-pressure effects.

Accuracy index
±0.075%FS range (conventional)

Stability
≤±0.2%FS/5 years

Concrete performance index
(Zero-base range, reference conditions, silicone oil filling liquid, 316 stainless steel isolation diaphragm, 4~20mA analog output, the digital fine- tuning value is equal to the set point value of range.)

Accuracy
(The reference accuracy includes hysteresis, linear, setting ability and repeatability, which are based on terminal.)

±0.075% range
If the range is less than X ±[0.03+0.06 x ]%

X value:

Damping time constant

The total damping time constant is equal to the sum of the damping time constants of amplifier unit and diaphragm capsule. The damping time constant of amplifier unit is adjustable within the range of 0~100s.

Diaphragm capsule (silicone oil)
Time constant (s) (The time constant can be set according to the actual situation of field and is recommended 1S)

Influence of installation position
The changing of installation position, which is parallel to the surface of diaphragm, will not cause the effect of null shift. If the change between the installation position and the surface of diaphragm do not exceed 90°, the null shift within 0.4KPa can be corrected by zero setting without influencing the range.

Influence of power supply

Less than ±0.005% range/v

Functional parameter

The limit value of range and sensor

Table 1: Range of WP361A transmitter and limit value of sensor

Zero point and range adjustment requirements

• The zero point and range can be adjusted arbitrarily within the range limit value indicated in Table 1.
• The range should be larger than or equal to the min. range indicated in Table 1.

Applications

Measurement of liquid, gas and steam

Output
Two-wire 4-20mA, linear output is selectable for users. Digital process variable overlays on the 4-20mA signal, which can be applied to the host machines according with HART protocol.

Power supply
Need external power supply. While standard transmitter (4-20mA) has no load, work at 14.5-45V DC.

Loop load limit
The max. loop resistance is decided by the voltage of external power supply, the relations are as follows:

Supply voltage – load characteristic relation scheme Note: The supply voltage range of transmitter with backlight display is 14.5~45V
The supply voltage range of intrinsic-safety series transmitter is 14.5～28V.
The working voltage while HART communication should be larger than 17.5V.

Max. overpressure
D: 10MPa
F: 20MPa
Fault mode
Output code
While discovering the faults of sensor or microprocessor by self diagnosis, the transmitter will output one high or low alarm signal to prompt the users. The alarm output value is subject to the factory configuration mode of transmitter:

Linear output: 3.8＜I＜20.8
C4: I=20.8mA high fault
CN: I=3.8mA low fault

Temperature limit

Environment

20 ～＋70℃

Storage
-46℃～110℃
With header: -40℃～85℃

Process
Larger than or equal to the atmosphere, please see the following table

Table 2: Process temperature limit of WP361A transmitter

• Silicone oil filled sensor: –40 to 121℃℃;
• Inertia liquid filled sensor: 30 to 121C

Temperature drift

≤0.075%FS/10℃

Humidity limit
0-100% relative humidity

Starting time
Reach to the performance index within 2s after the transmitter is power up.

Mechanical performance index

Electrical interface
ANSI(American-Standrad) NPT1/2(F) internal thread
ISO (Chinese standard) M20×1.5 internal thread

Process interface
No process interface (NPT1/4 internal thread on the chamber flange)
With waist-shaped interface: NPT1/2 taper pipe internal thread
With T-shaped interface: M20×1.5 external thread and back welding connecting pipe (stainless steel)
With waist-shaped interface matching used with NPT1/2 pressure-leading transition head and back welding connecting pipe (stainless steel)

Process liquid-contacting piece
Process isolation diaphragm: 316 stainless steel, hastelloy C

Drain/vent valve
316 stainless steel

Process flange and interface
Carbon steel cadmium plate, 316 stainless steel

Non-liquid-contacting piece

Shell
Aluminium die casting IP65

Coating
Spraying plastics
Meter cap O-ring
Nitrile rubber

Wiring diagram of terminal side

Connecting terminal

less than 10Ω)
| Ground terminal

Table 3: WP361A monocrystalline silicon absolute pressure transmitter

Note: Valve group integrated installation option” can be selected or not, the standard is provided for 316 material, if you have other requirements can contact our company
When “Valve Group Integrated Installation Option” is selected, the process connection type can only be P: no process connection 2,The default contact liquid material is 304 stainless steel.

Product Specifications

• Product Name: WP361A monocrystalline silicon absolute pressure transmitter
• Technology: HART fieldbus
• Material: Monocrystalline silicon
• Features: Advanced manufacturing technique, reliable quality experience

Product Usage Instructions

Sensor Membrane Head

The sensor membrane head is a crucial component of the transmitter responsible for detecting pressure changes.

Electronic Circuit Board

The electronic circuit board utilizes high-performance integrated circuits and surface packaging technology to process sensor input signals, perform linear treatment, and convert digital signals into analog output for communication.

Data Storage

The configuration data is stored in the permanent EPROM storage of the transmitter electronic board module, ensuring data retention even after power loss.

Digital/Analog Conversion and Signal Transmission

The transmitter stores process variables as digital data, performs accurate corrections, and converts them into analog output signals. The HART manipulator allows direct access to sensor readings without digital/analog conversion.

Communication Format

The WP361 series transmitter communicates using the HART protocol with Bell202 FSK technology, enabling simultaneous communication and output without loop integrity compromise.

Software Function

Users can configure, test, and perform specific settings using
HART protocol functions, including menu configurations, parameter adjustments, and graphical monitoring.

Options

• Liquid crystal header for displaying pressure values

• Transient voltage resistance protection

Frequently Asked Questions (FAQ)

Q: How can I access the configuration settings of the WP361 series

transmitter?

A: You can use a HART manipulator to conveniently access current regulation, parameter configuration, two-point fine tuning, and graphical monitoring settings.

Q: What communication protocol does the WP361 series transmitter use?

A: The WP361 series transmitter adopts the HART protocol for communication with the host machine.

Read User Manual Online (PDF format)

Download This Manual (PDF format)

Download this manual  >>