Pressure level transmitters designed to ensure accurate measurement of liquid levels in a variety of tank environments. The Rosemount 3051L Level Transmitter manufactured by Emerson has become the ideal instrument for open or closed tank applications. Our SI-3151LT Pressure Level Transmitter was built using this as a prototype.
Features a flange-mounted diaphragm designed to easily handle varying hydrostatic pressures and temperature changes. Whether used in vessels or open tanks, our pressure level transmitters deliver unmatched reliability.
The single flange liquid level gauge is an extension and development of pressure transmitter technology. According to the principle that the pressure generated by liquids with different specific gravity at different heights is linearly related, it realizes the volume, liquid height, Accurate measurement and transfer of weight.
The “dynamic profile” remote transmission diaphragm structure is adopted, the diaphragm will not be damaged after overloading, and the accuracy will not change after long-term work.
The filling system with full fusion welding and rigid sealing structure is used to eliminate the occurrence of oil leakage.
The novel design of the capillary combined parts ensures the reliable protection of the capillary and is not easy to break when used on site.
Remote transmission devices with various varieties, shapes and sizes, as well as a variety of filling fluids can meet the measurement needs of various occasions.
Various products for special needs can be provided, including remote pressure transmitters for high temperature, high vacuum, fast response and unequal length capillary (length ≤ 3 meters).
Easy to adjust: The two potentiometers of zero position and range can move the zero point or change the range arbitrarily within the effective range of liquid level detection. The two adjustments do not affect each other.
Wide range of uses; suitable for liquid level measurement of high temperature, high pressure, strong corrosion and other media.
The measuring range is large and not limited by the height of the storage tank.
With intrinsically safe explosion-proof and isolated explosion-proof capabilities, it can be used in various dangerous places.
With anti-blocking design, it can realize the measurement of the liquid level of paste medium.
Exquisite and unique zero point, full scale, and non-linear compensation. Guarantee the accuracy of the instrument within the range of operating conditions and good long-term stability.
The single-flange liquid level transmitter can measure the liquid level of various open containers and tanks. It is suitable for the measurement of high viscosity medium, suspension liquid and easy crystallization medium. Wetted diaphragm materials include 316L, Hastelloy C-276, Monel, tantalum, gold-plated, 316L+PTFE and other corrosion-resistant materials.
Mainly applicable to the following scenarios:
Viscous medium at high temperature;
Medium that is easy to crystallize;
Sedimentary media with solid particles or suspended matter;
Strong corrosive or highly toxic medium;
It can eliminate the occurrence of the leakage of the pressure guiding tube and pollute the surrounding environment. It can avoid the tedious work of frequently replenishing the isolation fluid due to the instability of the measurement signal when the isolation fluid is used;
Continuous and accurate measurement of interface and density;
The remote transmission device can avoid the mixing of different instantaneous media, so that the measurement results can truly reflect the actual situation of the process change;
Occasions with high requirements for sanitation and cleanliness;
For example, in the production of food, beverage and pharmaceutical industries, it is not only required that the part of the transmitter in contact with the medium meets the hygienic standards, but also it should be easy to wash to prevent cross-contamination of different batches of media.
A single-flange pressure level transmitter is a type of instrument designed to measure the liquid level in open tanks or containers. It works by measuring the pressure exerted by the liquid column above the transmitter, which is installed at the bottom or side of the tank The working principle of this transmitter is based on hydrostatic pressure, which is the pressure exerted by a fluid at a specific depth due to the force of gravity.
Here’s an explanation of the working principle and the calculation formula in simple, readable language:
Hydrostatic Pressure: When a liquid is at rest, its pressure at a specific depth (h) is directly proportional to the liquid’s height, density (ρ), and acceleration due to gravity (g). The formula to calculate hydrostatic pressure (P) is: P = ρ × g × h
Level Measurement: The single-flange pressure level transmitter senses the hydrostatic pressure exerted by the liquid column above the sensor, which is installed at the bottom or side of the open tank. Since the atmospheric pressure acts on both the liquid surface and the transmitter dia , it gets canceled out, and only the pressure due to the liquid column is measured. This pressure is then used to calculate the liquid level (h) using the following formula: h = P / (ρ × g)
The single-flange liquid level transmitter senses the measured pressure through a remote device installed on the pipe or container. The pressure is transmitted to the main body of the transmitter through the filling silicone oil (or other liquid) in the capillary.
Then by the delta chamber in the transmitter body and the amplified circuit board. Convert pressure or differential pressure to 4~20mA.DC signal output. Cooperate with a hand-held device conforming to the HART protocol, and can communicate with each other for setting and monitoring.
SI-3151LT Flange Specification Sheet
Common flange flush type specifications are as follows:
DN50(2 “) flange dimension specification sheet
Flange standard
B
C
E
A
Number of bolts n
Bolt aperture
150LB
150
120
95
19
4
18
300LB
165
127
95
20
8
18
600LB
165
127
95
32
8
18
900LB
215
165
95
45
8
26
PN1.6/1.0
165
125
95
18
4
18
PN2.5/4.0
165
125
95
20
4
18
PN6.4
180
135
95
26
4
22
DN80(3 “) flange dimension specification sheet
Flange standard
B
C
E
A
Number of bolts n
Bolt aperture
150LB
190
152
124
20
4
18
300LB
210
168
124
25
8
22
600LB
210
168
124
38
8
22
900LB
240
191
124
54
8
26
PN1.6/1.0
200
160
124
20
8
18
PN2.5/4.0
200
160
124
24
8
18
PN6.4
215
170
124
28
8
22
DN100 (4 “) flange dimension specification sheet
Flange standard
B
C
E
A
Number of bolts n
Bolt aperture
150LB
230
190
155
24
4
18
300LB
255
200
155
32
8
22
600LB
275
215
155
45
8
26
900LB
290
235
155
50
8
33
PN1.6/1.0
200
180
155
20
8
18
PN2.5/4.0
200
190
155
24
8
22
PN6.4
215
200
155
28
8
26
DN40 Flange size specification sheet
Flange standard
B
C
E
A
Number of bolts n
Bolt aperture
PN1.6/2.5
150
110
84
18
4
18
PN2.5/4.0
150
110
84
18
4
18
PN6.4
170
125
89
26
4
22
Common flange insertion barrel specifications are as follows:
A pressure level transmitter is an instrument that measures the level of liquid or fluid in a container, such as a tank or a vessel, by converting the pressure exerted by the liquid at a certain depth into an electrical signal. It helps in monitoring and controlling liquid levels in various applications, including industrial and process control systems.
a. Gauge Pressure Transmitter: Measures pressure relative to atmospheric pressure, which is used as a reference point.
b. Absolute Pressure Transmitter: Measures pressure relative to a perfect vacuum, providing an absolute pressure value.
c. Differential Pressure Transmitter: Measures the difference in pressure between two points in a system, commonly used for flow and level measurements.
d. Sealed Gauge Pressure Transmitter: Measures pressure relative to a fixed, pre-defined reference pressure, typically atmospheric pressure at sea level.
A differential pressure level transmitter measures the difference in pressure between two points in a system, typically the bottom and top of a liquid-filled container or across a flow restriction. By measuring this pressure difference, the transmitter can calculate the liquid level, flow rate, or other parameters. It consists of a diaphragm that flexes as the pressure difference changes, and this movement is converted into an electrical signal proportional to the pressure difference, which is then used for calculations and control purposes.
For a pressure level transmitter, it is based on hydrostatic pressure, which is the pressure exerted by a fluid at a specific depth due to the force of gravity. The transmitter senses the hydrostatic pressure and converts it into an electrical signal. This electrical signal is then used to calculate the liquid level using a formula that involves the liquid’s height, density, and the acceleration due to gravity.
Other types of level transmitters, such as ultrasonic, radar, or capacitive, work on different principles but ultimately serve the same purpose of measuring liquid levels in a container or vessel.
Selection of pressure transmitters is related to its use. Generally, when selecting, it is necessary to consider many factors comprehensively…
In summary, Sino-Inst is a professional manufacturer of Pressure Level Transmitters, providing you with reliable and precise solutions for monitoring liquid levels in various tank and vessel applications. With years of experience and a commitment to quality, our products are designed to deliver accurate results and ensure smooth operations for your industry needs.
Contact us today to learn more about our Pressure Level Transmitters and experience the Sino-Inst difference. Our dedicated team is ready to assist you in selecting the best instrument for your application. Trust Sino-Inst for all your pressure level measurement needs and elevate your operations to new heights.
Zhang Wei, possesses 20 years of experience as an automation instrumentation engineer, specializing in the research, design, installation, commissioning, and maintenance of automation instruments.
Face to various instrument communication protocols (such as Modbus, Profibus, etc.), with solid hardware circuit design and software programming skills (proficient in C language and PLC programming). Has extensive project experience; projects he has led and participated in have all achieved outstanding results, improving product accuracy, reducing costs, and increasing production efficiency.
Possesses excellent communication and coordination skills and a strong team spirit, enabling him to quickly respond to customer needs and provide high-quality automation instrumentation solutions.
Pressure level transmitters designed to ensure accurate measurement of liquid levels in a variety of tank environments. The Rosemount 3051L Level Transmitter manufactured by Emerson has become the ideal instrument for open or closed tank applications. Our SI-3151LT Pressure Level Transmitter was built using this as a prototype.
