SMT3151 Capacitive Pressure Transmitter adopts internationally leading and technologically mature metal capacitive sensors. Has good versatility and substitution capabilities.
The technically mature metal capacitive sensor has an accuracy of up to 0.04% (optional) and ± 0.065% of the measurement range set as standard.
Local display and local buttons facilitate debugging, with HART digital communication, and remote debugging using a handheld communicator.
High and low temperature aging, multiple temperature compensation acquisition design, better solve the problem of temperature drift, with high accuracy.
The diaphragm material in contact with the medium can be selected (316L, TAN, HAS-C, MONEL and other corrosion-resistant materials)
Suitable for installation in hazardous locations: flameproof Exd BT5Gb; intrinsically safe ExialCT4/T5T6Ga.
Excellent resistance to static pressure effects, the one-way overload pressure can reach 16MPa.
Features
- Complete measuring range: -1 Bar to 600 Bar.
- The structure is compact, strong, and anti-vibration. Integrated junction box, local zero and span adjustment, LCD display configuration buttons. Simplifies installation, calibration, and operation.
- Non-contact local zero point, range adjustment, and LCD display parameter configuration buttons are designed on the transmitter housing.
- Uses solid, plug-in printed circuit board and modular structure — helpful for troubleshooting.
- The damping is adjustable, improving user flexibility.
- Intelligent circuit for user-friendly operation.
- Equipped with independent anti-electromagnetic interference circuit and software-based interference protection.
- Includes a sensor for measuring internal temperature parameters, improving ambient temperature compensation performance.
- Can directly display: measured pressure value, output analog current value, pressure as a percentage of the set range, and temperature of the sensor body and the contact medium.
- The transmitter improves fault recovery capability, greatly reducing maintenance workload.
- The LCD display operates in multi-parameter cycle display mode.
- Supports HART protocol for remote communication.
- Innovative delta chamber design with a fully metal-sealed differential capacitance pressure sensor ensures improved stability and accuracy in pressure and temperature measurement.
Specifications
| Item | Specification |
| Measuring range | -1 Bar to 600 Bar |
| Output signal | 4–20 mA DC (also supports four-wire 220V power with 0–10 mA DC output), customizable 0–5V, 0–10V |
| Power supply | 12–45 V DC, generally 24 V DC |
| Load characteristics | Related to power supply; load impedance RL ≤ 50 × (Vs - 12) |
| Local display | Pointer type 0–100% scale or LCD/LED digital display |
| Explosion-proof | Flameproof type dIIBT4; Intrinsically safe iaIICT6 |
| Temperature range | Amplifier operating: -29 to +93°C (LT type: -25 to +70°C) |
| Measuring element filled with silicone oil | -40 to +104°C |
| High temperature silicone oil (flange type) | -20 to +315°C; Ordinary silicone oil: -40 to +149°C |
| Static pressure | 1, 4, 10.25, 32 MPa |
| Humidity | Relative humidity: 0 to 100% |
| Accuracy | 0.065% of URL (including linearity, hysteresis, and repeatability) / 0.04% (optional) |
| Stability | ±0.1% of the URL for 5 years |
| Vibration effect | At 200 Hz, error is ±0.05%/g of upper measurement limit |
| Power supply influence | Less than 0.005%V of output range |
| Isolating diaphragm | 316 Stainless Steel, Hastelloy C-276, Monel, Tantalum |
| Vent/Drain valve | 316 Stainless Steel, Hastelloy C, Monel |
| Flanges and fittings | 316 Stainless Steel, Hastelloy C, Monel |
| O-ring (contact medium) | Nitrile rubber, fluorine rubber |
| Filling fluid | Silicone oil or inert oil |
| Bolt | 316L Stainless Steel |
| Electronic housing material | Low copper aluminum alloy |
| Pressure introduction connector | Flange, NPT1/4, center 54 mm; NPT1/2 or M20×1.5 male thread, center 50.8 or 54 mm; Signal wire hole: G 1/2" |
| Weight | 2.4 kg |
Application Guide
| SI-3151TLT | Diaphragm Pressure Transmitter | ||||||
| B | Standard type | ||||||
| J | Compact type | ||||||
| T | Ceramic capacitive Type | ||||||
| Range | A | 0-5KPa-20KPa | E | 0-0.7MPa-3.5MPa | |||
| B | 0-20KPa-70KPa | F | 0-2.0MPa-7MPa | ||||
| C | 0-70KPa-350KPa | G | 0-7MPa-35MPa | ||||
| D | 0-200KPa-700KPa | H | 0-20MPa-100MPa | ||||
| Display | 1 | no display | |||||
| 2 | Digital display | ||||||
| 3 | LCD Display | ||||||
| Installation | M | M20*1.5 external thread | |||||
| MF | Diaphragm type (mark: flange specification + diaphragm material) | ||||||
| O | Other specifications (please mark) | ||||||
| Output signal | E | 4～20mA two-wire system (DC 24V) | |||||
| K | 0～20mA | ||||||
| M | user agreement | ||||||
| Explosion-proof | 0 | Non-explosion-proof | |||||
| i | Intrinsically safe type iaⅡCT6 | ||||||
| d | Flameproof dⅡBT4 | ||||||
| Additional options | Damping adjustment | ||||||
| Migrate | |||||||
| Absolute pressure measurement | |||||||
| Negative pressure measurement | |||||||
| Select ceramic sensor | |||||||
| Heat sinks and process connections | |||||||
| User agreement | |||||||
Additional Information
How to calibrate a pressure transmitter? How often?
Calibrate a pressure transmitter is an important step in ensuring its accurate and reliable measurements. It is normal for the pressure transmitter to have a certain error. But if the error is too large, it needs to be calibrated. There are two types of calibration for pressure transmitters: conventional method and intelligent calibration.
10 Point Guide! Selection of Pressure Transmitters
Selection of pressure transmitters is related to its use. Generally, when selecting, it is necessary to consider many factors comprehensively. Including what kind of pressure to measure, what kind of pressure medium, accuracy requirements, temperature range, and how to obtain the output signal. Do you need an interchangeable pressure transmitter? Stability and so on.
Differential pressure transmitter is a very common type of thermal measuring instrument in the field of industrial production. It is mainly used to measure physical parameters such as pressure, liquid level and flow of liquid medium.
At present, in industrial automation production equipment, the application range of differential pressure transmitter is more and more extensive. Humlex is a manufacturer of differential pressure transmitters. We supply differential pressure transmitters for a long time, and the price is advantageous.
If you need to configure a differential pressure transmitter, or if you have any questions about the technology of the differential pressure transmitter, please feel free to contact our sales engineers.