1. Overview

SM39-DH01P HART protocol intelligent pressure transmitter is a high-precision, high-stability, multi-parameter, 4.5-digit LCD display intelligent pressure measurement product that complies with the HART protocol. Users can use the HART communicator to manage, adjust or monitor process variables of the HART instrument running in the process, or use buttons for on-site configuration, which is easy to operate. Precision digital temperature compensation and nonlinear correction technology, safe and reliable explosion-proof structure design and standardized signal output, high accuracy, wide range coverage, suitable for places where precise measurement of fluid pressure is required. This product works in a two-wire mode and can directly replace the analog two-wire 4-20mADC output transmitter. It can be widely used in various fields such as petroleum, chemical, steel, electric power, building materials, textiles, pharmaceuticals, food, gas, scientific experiments and military industry. It has been promoted and applied in oil fields such as Daqing, North China, Xinjiang, etc., and has won user recognition for its high accuracy, high reliability, simple installation, convenient maintenance, environmental protection and durability.

2. Features

4~20mA current output superimposed with HART protocol digital communication (two-wire system);

·Adopt digital compensation and nonlinear correction technology; -10℃～80℃ digital wide temperature compensation;

·With local and remote zero point and range adjustment functions;

On-site key operation is available for easy configuration;

·Protection grade IP65.

3. Performance indicators

Table 1. Performance indicators of SM39-DH01P HART protocol intelligent pressure transmitter

Accuracy: ±0.1%FS (typical), ±0.25%FS (maximum)

Zero temperature error: ≤±0.25 %FS (within the full operating temperature range)

Full scale temperature error: ≤±0.25 %FS (within the full operating temperature range)

Long-term stability: ≤±0.25 %FS/year

Compensation temperature: -10℃～80℃

Working temperature: -20℃～80℃

Storage temperature: -40℃～85℃

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Power supply: (15～30) VDC

Digital output: (4~20)mADC output superimposed with HART protocol digital communication

Display: LCD display, two/three-button control

Damping: (0～32)s

Load capacity: (U-12V)/0.02Ω

Insulation: 100MΩ/50V

Explosion-proof certificate number: Explosion-proof certificate number: CE18.1519 Explosion-proof mark: EXd IIC T6 Gb

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Vibration: 20g, (20～5000) Hz

Shock: 20g, 11ms

Diaphragm: Stainless steel 316L/Tantalum

Pressure interface: stainless steel 1Cr18Ni9Ti/Hastelloy C

O-ring: Fluororubber

Weight: Approx. 1.7kg

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4. Appearance and structure

See Figure 1. SM39-DH01P HART protocol intelligent pressure transmitter appearance structure diagram (unit: mm)

5. Electrical wiring

Open the back cover of the instrument (terminal side) to see the terminal. The power connection is shown in Figure 2: The left end 1+ (red) and 2- (black) are for sensor power supply and signal wiring, and terminal 3 is reserved. There is a toggle switch on the right side to control the battery power supply, and the upper terminal 4 is used to fix the signal line shielding line.

6. Instructions for use

6.1. All sensors are digitally calibrated, and different sensors are completely consistent and interchangeable.

6.2. During transportation, all sensor batteries are disconnected. When installing the pressure sensor on site, you need to unscrew the back cover, turn the switch to "on", and the LCD will display normally, indicating that the battery is successfully connected. Connect the sensor power supply and signal wiring to the left end 1+ (red) and 2- (black) on the 3-core terminal, install and tighten the back cover. Pay attention to tightening the sheath to prevent water leakage.

6.3. To install the pressure sensor on the pipeline, first close the needle valve where the sensor is installed; then wrap the raw tape around the sensor threaded joint; screw the sensor into the pipe joint; open the needle valve to confirm there is no leakage, and the installation is complete.