A Quick Look at the Submersible Pressure Transmitter

Figure 1: A submersible pressure transmitter.

Submersible pressure transmitters use imported chip assembly, reflecting the superior technology. Their structure is compact and firm and is light for installation. Zero and full-scale range can be adjusted by pressing the key, with the wide migration range. They are suitable for all kinds of gas pressure or differential pressure measurement in high precision.

In addition, with adopting integral stainless steel components, imported elastomer components, high-precision strain gauge, and advanced laminating technology, the submersible pressure transmitters are highly sensitive, stable, and of impact resistance. Thanks to 316 stainless steel fully sealed welding, they have good moisture resistance and excellent medium compatibility. Therefore, they are capable of measuring mildly corrosive liquids and gases.

In general, submersible pressure transmitters or level probes are used for varying immersion depths and filling heights up to hundreds of meters. Since they are applied in the widest range of different media, there must be a rating of IP68 for unlimited immersion time within a given measured depth.

Submersible Pressure Transmitter Working Principle

The submersible pressure transmitter measures the hydrostatic level, in which a diaphragm is used as a pressure sensor. Even in harsh environments for measuring media contaminated by the dirt, particles or fibers, the measuring unit of the liquid level probe must ensure accurate and reliable measurement.

Figure 2: The submersible pressure transmitter is measuring the hydrostatic level.

We will put this transmitter in a water tank at the bottom, and use a cable up to the surface of the water. The transmitter will send a 4-20 mA signal corresponding to the pressure. To get information about the pressure, we need to know the depth of the tank and the length of the cable.

In principle, submersible pressure transmitters are composed of five different elements: the sensor or measuring unit, the electronics, the housing, the cable inlet and the cable itself. The submersible pressure transmitter with a cage is designed for protecting the diaphragm from the dust.

Applications of the Submersible Pressure Transmitter

Table 1: Design features and measurement applications of the submersible pressure transmitter.

Pressure Transmitters for Submersible Equipment

In recent, with the rapid development of the electronic industry and the various submersible equipment, the devices require more precise detection technology. The aim of energy saving and emission reduction and increased development of the intelligent network is further boosting the momentum of all kinds of intelligent devices to be used as the carrier of sensors.

As is known to us, due to the limitations of the volume and load of the submersible, the sensors used in the integrated navigation display control system must be small, light, and resistant to high pressure. Besides, it should quickly and accurately receive the navigation parameters of the submersible.

To help the deep dive of submersibles, they are equipped with an integrated navigation system to ensure accurate dive and successful underwater tasks. In the measurement of temperature, pressure, depth, density, and other state parameters of the sea, the MS5534C transmitter can measure all of them, and can well meet the requirements of the system in precision, volume, and weight.

Figure 3: An MS5534C silicon piezoresistive pressure sensor.

MS5534C silicon piezoresistive pressure sensor is a multifunctional and digital pressure transmitter using a microprocessor with high precision. Combining unique digital output, advanced digital circuits, and updated internal compensation software systems, it provides a resolution of precision up to 0.1mbar in a small and low-power package. The sensor is calibrated by the software, with temperature compensation. In addition, there is pressure and temperature measurement (35 ms/ Meas.), low power consumption (2.2-3.6V/ 4/0.1uA), and no need for peripheral components. It is in a small SMD ceramic structure with anti-corrosion sealant protection.

The MS5534C pressure sensor is a laminating device, including a piezoresistive pressure sensor and an ADC interface chip. It provides a 16-bit digital signal for pressure- and temperature-dependent voltage. In addition, the module contains a highly accurate sensor for software correction of 6 readable coefficients. MS5534C is low power consumption, low voltage automatic power-off device down (on/off) switch. A 3-wire interface is used for all communication with the microcontroller.

The MS5534C sensor is fully compatible with previous versions of the software (MS5534A and MS5534B). The ESD sensitivity level of all pins has been improved to 4kV. Moreover, the MS5534C sensor also meets the latest measurement standards and accuracy requirements of 0.1mbar in the temperature range from -40℃ to 125℃.

At the same time, a series of easy-to-use features, such as pressure and height conversion of engineering units, digital height setting display (DASI), corrected height mode, high and low bit alarm setting, zero/peeling function, and min/max point tracking, make the sensor useful.

In a word, submersible pressure transmitters are helpful in the measurement of state parameters in water such as the sea.

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