The 3051 Pressure Transmitter operates by using high and low pressure isolation diaphragms along with fill fluids to transmit the process pressure to the central sensor diaphragm. This diaphragm, a tensioned elastic element, moves in response to the applied pressure—whether it's gauge or absolute. In the case of a GP (gauge pressure) transmitter, atmospheric pressure effectively acts on the low-pressure side of the sensing diaphragm. For an AP (absolute pressure) transmitter, the low-pressure side is always referenced to a known vacuum or pressure. The maximum displacement of the sensing diaphragm is limited to 0.004 inches (0.1 mm), and this movement is directly proportional to the pressure being measured. Capacitive plates on both sides of the diaphragm detect its position, and the resulting change in capacitance is converted into an electrical signal—either current, voltage, or a digital HART (High Speed Addressable Remote Transmitter) output.
The 3051 series offers a wide range of measuring capabilities, from 0–0.5 inH2O up to 6000 psig. It features a compact, rugged, and shock-resistant design, making it ideal for harsh environments. Its modular structure allows for easy customization, while adjustable damping options provide flexibility in different applications. The transmitter supports smart, analog, or low-power circuit configurations and comes with various process connectors and mounting flanges for easy installation.
The 3051 series includes several models tailored for specific applications:
- **3051C**: A gauge and absolute pressure transmitter with high accuracy (0.075%) and a turndown ratio of 100:1. It offers differential pressure ranges from 0.5 inH2O to 2000 psi, gauge pressure from 2.5 inH2O to 2000 psi, and absolute pressure from 0.167 psia to 4000 psia. It uses stainless steel, Hastelloy CR, Monel R, and gold-plated Monel for isolation diaphragms. Its small, durable design makes it easy to install and maintain.
- **3051T**: Designed for gauge and absolute pressure measurement, it offers similar accuracy (0.075%) and a broader range, up to 10,000 psi. It features stainless steel and Hastelloy CR diaphragms and can be configured with DIN or Autoclave-style process connections.
- **3051L**: A level transmitter with high accuracy (0.075%) and a range from 2.5 inH2O to 8310 inH2O. It includes flat, extended diaphragms and a variety of fill fluids to suit different applications. It is lightweight and easy to install and maintain, with wetted parts made from stainless steel, Hastelloy, and tantalum.
- **3051H**: A high-temperature model capable of measuring up to 375°F (191°C) without requiring remote seals or capillary tubes. It maintains the same precision and performance as the 3051C model.
- **3051P**: Known for its exceptional accuracy (0.05%), it’s ideal for custody transfer, financial calculations, and distribution measurements. It eliminates the need for multiple transmitters and reduces the impact of temperature variations.
- **3051C Low Power**: The world’s first intelligent low-power pressure transmitter, operating on 6–12 VDC with power consumption as low as 18–36 mW. It offers all the features of the standard 3051C model, including a true digital meter, and supports optional 0.8–3.2V and 1–5V outputs.
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