SUPMEA P300 - User Manual

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Overview

Function Description
Usage Features
Maintenance Features

This document serves as a user manual for the Supmea pressure transmitter, providing comprehensive information on its operation, installation, and maintenance. The manual emphasizes the importance of reading it thoroughly before use to prevent any losses due to incorrect operation.

Function Description

The Supmea pressure transmitter is designed to accurately measure pressure in various applications. It utilizes imported high-precision and high-stability pressure-sensitive chips, which are fabricated using advanced micro-mechanical etching processes. These chips form a Wheatstone bridge by diffusing four high-precision resistors with temperature compensation on silicon wafers. The core principle of its operation relies on the piezoresistive effect: changes in pressure cause changes in the resistance values of the four bridge arm resistors, leading to an unbalanced bridge. The sensor then outputs an electrical signal corresponding to the pressure change. This output signal is further processed and compensated by amplification and non-linear correction circuits, which generate voltage and current signals that linearly correspond to the input pressure.

The device is capable of measuring absolute pressure, gauge pressure, and sealed reference pressure, making it versatile for a wide range of industrial needs. For models with a display (P400 series), the device offers various display functions, including pressure value, percentage, and current display on the main screen. The sub-display can show temperature or be turned off. The display mode can be adjusted and saved, though panel settings are cleared after power loss. The P400 series also includes a monitoring menu with different access codes depending on the output type (4-20mA or RS485/RS485&4-20mA), allowing for the setting of display units, resolution, and mode.

Usage Features

The pressure transmitter is designed for ease of use and installation. It features a compact structure, allowing for straightforward integration into existing systems. The manual provides detailed wiring diagrams for different connector types (DIN and cable connectors) and output configurations (current, voltage, and RS485), ensuring proper electrical connection.

For models with a display, the device offers intuitive navigation and setting options through its function keys (M, S, Z).

"M" key:
- Short press in measurement mode to enter password setting.
- Long press (5 seconds) in measurement mode to initiate principal variable reset (PV reset).
- Short press in setting mode to enable parameter modification (flashing display), and another short press to confirm (stops flashing).
"S" key:
- Short press in measurement mode to modify the display mode.
- Long press (5 seconds) in measurement mode to enter the filling function (for calibration, not recommended without a standard source).
- In setting mode, it increments parameter values and allows for continuous shifting.
"Z" key:
- Short press in measurement mode to modify the display mode.
- Long press (5 seconds) in measurement mode to enter the zero function (to calibrate the transmitter zero point).
- In setting mode, it allows for parameter displacement and reduction, enabling continuous shifting or subtraction.

The monitoring menu provides extensive customization options:

Loc (Password Input): Allows entry into the menu with a specific password (e.g., "00001" for 4-20mA output, "00016" for RS485/RS485&4-20mA output). Incorrect password or inactivity for 30 seconds will return the device to measurement mode.
Unt (User Unit Settings): Offers 19 types of pressure units (e.g., MPa, KPa, Pa, bar, PSI, mH2O, mmHg, etc.) to be set according to user preference.
Dot (Display Precision Setting): Configures the number of decimal places displayed (0-4). This setting is limited by the transmitter's maximum display value and the 5-bit display range to ensure normal display.
SHO (Display Mode Setting): Provides six display modes (0-5), including main variable, current, percentage, and alternating displays, with corresponding prompts.
End (Exit Setting Menu): Allows saving or discarding changes before exiting the setting mode.
ADR (RS485 Address): For RS485 output, sets the device address (range 1-25).
BOT (Baud Rate Setting): Configures the communication baud rate for RS485 output (e.g., 1200, 9600, 115200 bps).
BDL (Lower Range Value): Sets the pivot variable value corresponding to 4mA output, used as the zero point for range scaling.
BDH (Upper Range Value): Sets the pivot variable value corresponding to 20mA output, used as the pressure point for range scaling.
OFT (Zero Offset): Adjusts the zero offset value of the main variable, enabling zero point transformation.
GAI (Gain Coefficient): Sets the gain coefficient for secondary calibration, with a resolution of 0.0001FS.
FIL (Filtering and Damping): Configures filtering and damping values (0-30), with larger values providing a stronger filtering effect.
SOL (4mA Calibration): Allows observation and adjustment of the external ammeter current to achieve an accurate 4mA output.
SOH (20mA Calibration): Allows observation and adjustment of the external ammeter current to achieve an accurate 20mA output.
OUT FIX (Current Test Menu): Displays various current values (e.g., 3.800, 4.000, 8.000, 12.000, 16.000, 20.000, 20.800, 22.500mA) for testing purposes.
OUT (Output Type): Sets the transmitter output to either linear or square root. Square root output is typically used for flow calculations in differential pressure transmitters, while linear output is generally selected for other applications.

Installation guidelines emphasize selecting a location with minimal temperature fluctuations, avoiding vibration and shock. The transmitter can be directly installed at the measuring point using standard connection threads (M20*1.5 or 1/2-NPT) or specialized flange interfaces. It is crucial to avoid routing signal lines near power lines or high-power equipment to prevent interference. When using pressure pipes, especially with strong corrosive or superheated media, care must be taken to prevent direct contact with the transmitter and to fill pipes with water for steam measurements to protect the device.

Maintenance Features

The manual highlights several safety instructions and cautions to ensure the longevity and reliable operation of the pressure transmitter.

Tightening and Sealing: The cap must be hand-tightened, and connection holes sealed to prevent water accumulation in the shell.
Sealing Joint Integrity: The sealing joint should not be loosened and must be kept reliable.
Proper Usage: Transmitters must be used according to their specifications, and different types are not interchangeable.
Range Limits: While the transmitter range can be reduced, the upper limit must not exceed 1.5 times the specified range.
Medium Compatibility: The transmitter is designed for use with media that do not corrode silicon and stainless steel (or aluminum alloy).
Pressure Limits: The maximum pressure of the measured system should not exceed 150% FS of the rated value during instantaneous occurrences.
Environmental Protection: The back end of the pressure transmitter must not come into contact with conductive or corrosive liquids or gases.
Physical Protection: Sharp objects should not be inserted into the pressure input hole to prevent damage to the core. Water must not enter the back-end lead of the sensor.
Adherence to Precautions: Users are advised to strictly follow all precautions to avoid potential consequences.

Supmea provides a warranty and after-sales service commitment, promising that hardware accessories are free from defects in material and manufacturing. Defective products within the warranty period will be maintained or replaced free of charge. Non-customized products can be returned and replaced within 7 days of purchase. The warranty does not cover faults caused by improper use, disassembling, repairing, or refitting by customers. For technical questions, Supmea commits to responding within 2 hours. For instruments returned for maintenance, test results will be provided within 3 working days, and maintenance results within 7 working days of receipt.

SUPMEA P300 Specifications

General

Display	LCD
Protection Grade	IP65
Sensor Type	Electrochemical
Resolution	1 ppm
Response Time	<30 seconds
Alarm	Audible and Visual
Battery	3.7V rechargeable lithium battery
Operating Temperature	-20℃~50℃
Storage Temperature	-20℃~60℃
Operating Humidity	10% to 90% RH (non-condensing)

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