1. Features

• Embedded wireless data transmission module based on LoRa spread spectrum technology, using LoRa network to provide users with wireless data transmission function
• Oil field pipeline pressure, well formation pressure, pressure monitoring and upper and lower limit alarms;
• Explosion-proof design: explosion-proof aluminum shell, circuit board system is intrinsically safe;
• Protection level: IP68, fully sealed waterproof design;
• The instrument can set parameters such as alarm enable, upper and lower limits, delay, dead zone, maximum range, minimum range, number of decimal places, upload frequency, acquisition frequency, change alarm, etc.
• LED indication: reset indication, configuration mode indication, network access indication, data collection indication;
• 4.5-digit LCD display: pressure data, battery capacity icon, upper and lower limit alarms, and other parameters.
• Adjustable installation direction: It can be connected to the on-site pipeline valve through a union or adapter, and the direction can be adjusted.
• This product has been widely used in the oil and gas Internet of Things industry.

2. Performance indicators

1. Working environment temperature: -40~70℃
2. Ambient humidity: 0～95%RH, no condensation;
3. Protection grade: IP68;
4. Explosion-proof mark: Ex ib II C T4 Gb, explosion-proof certificate: CE18.2230X;
5. Power supply: ER34615 lithium thionyl chloride battery (implementation standard: SJ52278/1), two primary batteries in parallel, capacity 3.6V 38Ah; battery connector SM-2P (female: 1-pin positive, 2-pin negative) connected to the instrument; power supply voltage range, 3.0V～3.6VDC;
6. Battery continuous working time: ≥1 year (pressure acquisition frequency 1 time/min, communication frequency 1 time/h);
7. Battery replacement method: Open the back cover of the instrument and quickly replace it through the standard SM-2P interface;
8. Long-term stability: drift, ±0.1%FS/year;
9. Measuring performance: range, 0~2.5MPa, 0~6.0MPa, 0~25MPa, 0~40MPa, 0~60MPa; accuracy, 0.5%FS; can be customized according to actual needs; in accordance with GB/T 28474.1, GB/T 28474.2;
10. Pressure sensor: piezoresistive core, pressure overload capacity, 150%FS;
11. Process connection interface: M20X1.5 or 1/2''NPT, can be customized according to actual needs;
12. Communication method: LoRa multiple frequency bands (433/470/780/868/915MHz);
13. Communication theoretical bandwidth: 6 levels adjustable (0.3, 0.6, 1.0, 1.8, 3.1, 5.5 Kbps)
14. Online debugging and setting function: It can debug and set the instrument through computer + wireless receiver without uninstalling online installation; the setting data content includes:

• Communication working parameters: network number, air rate;
• Measurement working parameters: alarm enable, upper and lower limits, delay, dead zone, maximum range, minimum range, decimal places, upload frequency, acquisition frequency, change alarm;

After the instrument is powered off, the setting data is retained;

15. Online upgrade: It can be realized by configuring the serial port and using a computer without uninstalling the installation.
16. Liquid crystal (LCD) display: LCD display area, length × width = 45 × 35mm, the background color is green, the display content includes real-time measurement value, pressure unit, instrument range, battery power, voltage, signal strength; the decimal point of the real-time measurement value can be set, and 2 decimal places are retained by default;

  17. Instrument housing: Made of aluminum alloy, the housing seal (gasket) is silicone rubber, and the front and rear cover threads are coated with vaseline; the dial diameter is 60mm, and the exterior color is RAL5007;

  18. Overall dimensions: length × width × height = 150 × 130 × 235 mm (MAX).

  19. Sampling interval: The sampling interval can be set from 1 to 60 minutes.

  20. Sending interval: 5 to 1440 minutes.

  21. SMS sending interval: 5 to 1440 minutes.

Explosion-proof certification parameters

Explosion-proof certificate number: CE18.2230X

Explosion-proof mark: Ex ib ⅡC T4 Gb

4. Appearance structure and function introduction
5. SM39PWB-LoRa Wireless Pressure Transmitter Front panel function diagram Front panel LED: Red represents temperature collection status and sleep to wake-up status,
6. Front panel reset: Use a magnet to position the magnet upwards towards the reset arrow just below the front cover of the housing. Hold it steady for 3-5 seconds before removing the magnet. The red LED light will flash 3 times and the LCD display 8888 will also flash three times, indicating that the instrument has been successfully reset. The main purpose of the reset is to enter the instrument to modify internal parameters, refresh the current pressure value, and re-establish a network link. 5. On-site installation instructions 5.1. All transmitters are digitally calibrated, and different transmitters are completely consistent and interchangeable; 5.2. During transportation, all transmitter batteries are disconnected. When installing the pressure transmitter on site, you need to unscrew the back cover of the meter head and turn on the battery switch. Pay attention to tightening the sheath to prevent water leakage; 5.3. When installing the cellular network wireless pressure transmitter on pipelines and wells that are normally shut down, first close the valve (needle valve or gate valve) on the pipeline where the pressure transmitter is to be installed. Then there are two installation methods: (1). Screw the pressure transmitter directly into the upper port of the needle valve; (2) Screw the union or adapter into the upper port of the needle valve, and then screw the transmitter into the upper port of the union or adapter. This installation method adjusts the direction by adding a union or adapter. After installation, open the needle valve to confirm that there is no leakage, which means the installation is qualified; 5.4. After the installation of this cellular network wireless pressure transmitter is completed, the network parameters can be set by pressing buttons or debugging tools. 5.5. If the transmitter is not used for a long time, the pressure transmitter can be set to sleep mode through the debugging tool. (The transmitter is uniformly set to sleep mode or closed during the factory storage process, and it needs to be activated on site before it can be used normally). The online list of the debugging software interface is as follows: 6. Precautions 6.1. The battery model used in this product is ER34615H-3.6V38Ah; other types of batteries are prohibited. 6.2. The antenna shell of the product is made of plastic, which has potential electrostatic charge hazards! Avoid friction during use! Please wipe with a damp cloth when cleaning!