Capacitive liquid level transmitter

NegotiableUpdate on 01/01

Model

Nature of the Manufacturer: Producers

Product Category

Place of Origin

Online Consult

Overview

Main technical parameters of 3051 pressure transmitter: 1. High precision:? 0.75% 2, Wide Range Ratio: 100:1 3, Stability: Two years better than? .1％URL 4、 High static pressure: 13MPa~31MPa 5. Output function: linear, square root, cube root 6. Multiple display units: MPa, KPa, Pa, 100%, mA, mH2O instantaneous cumulative flow 7. Self diagnostic function, fault safety function 8. PID control function, passive calibration, etc

Product Details

1Capacitive liquid level transmitterOverview
The UYB series liquid level transmitter belongs to the capacitive liquid level detection instrument. It can convert various changes in liquid level parameters into standard current signals, which are remotely transmitted to the operating room for centralized display, alarm or automatic control by secondary instruments or computer devices. Based on the specific process conditions, equipment structure, and usage requirements of users, the flexible combination of materials, structure, and installation methods of the liquid level gauge can be applied to continuous detection of liquid level, material level, or material level under special conditions such as high pressure, high temperature, strong corrosion, easy crystallization, anti blocking, anti freezing, and solid powder, granular materials. It can be widely used for detection and control in various industrial processes. Among this series of products, four have been awarded to China, namely: "Integrated Liquid Level Display Transmitter", certificate number 85099 "Corrosion resistant Liquid Level Transmitter", certificate number 75884; "High pressure Liquid Level Transmitter", certificate number 92612; "Built in High pressure Liquid Level Transmitter", certificate number 128970.

IICapacitive liquid level transmitterModel Description
For example, UYB-OA represents a level gauge with sensors directly inserted into atmospheric open containers, which can be used in water towers, reservoirs, oil tanks, tank trucks, reservoirs, sewage treatment, and other places.
UYB-40B， A liquid level gauge that can be used for working under a pressure of less than 4MPa, which can be installed using the existing liquid level gauge on the equipment and led out through a reserved hole for gas-liquid phase. It can be used for liquid level detection in boiler steam drums, deoxygenated water tanks, and most chemical containers, towers, and tanks by using the principle of connecting pipes and external measuring pipes.
UYB-32C， Indicating that it can be used in pressure vessels below 32MPa, the liquid level sensor can be directly installed into the equipment to avoid oil contamination, crystal blockage, and situations where serious false liquid levels occur during external installation due to differential pressure of equipment components, which may prevent normal operation. Mainly suitable for ammonia separator lining and cold exchanger in synthetic ammonia production, alcohol separation tower in methanol production, etc.

It can not only accurately measure the liquid level changes in high-pressure vessels, but also greatly simplify the installation of high-pressure systems, save a lot of installation materials and costs, and achieve significant effects of increasing production, saving energy, and reducing consumption. Many small and medium-sized nitrogen fertilizer plants can achieve net efficiency gains of hundreds of thousands of yuan per year after use, and the investment in the liquid level gauge can be recovered within a few days. The high-pressure liquid level detection and self-control system for synthetic ammonia, composed of this type of liquid level gauge, has solved a long-standing technical problem in the small nitrogen fertilizer industry and has shown significant energy-saving and consumption reducing effects. It was awarded the third place in the 13 technical progress awards held by the National Small Nitrogen Fertilizer Industry Association in 1992 for the first time in a decade. UYB-22T refers to liquid level detection instruments with special requirements in pressure vessels with a working pressure below 22MPa, such as strong corrosive media, easily crystallized media, volatile media, low boiling point media, etc., such as strong acid and strong alkali liquid levels in chemical plants, liquid levels in first and second distillation towers in urea production, and liquid levels in copper washing towers and carbonization towers in fertilizer production.
IIIInstrument features
1. Simple structure: There are no movable elastic components, so the reliability is relatively high and the maintenance is minimal. Generally, there is no need for routine major, medium, or minor repairs
2. Easy installation: The built-in structure particularly demonstrates this feature, with one person holding one wrench and it can be installed in just over ten minutes
3. Easy adjustment: The zero position and range potentiometers can be used for zero point migration or range compression or expansion within the effective range of liquid level detection.
4. Liquid level detection is basically not affected by changes in process conditions. The buoyancy type, differential pressure type, and isotope type level gauges are all related to the importance of the medium in detection, and changes in the density of gas-liquid phase media can cause additional errors in the detection results.
5. Wide applicability: Specially customized according to the specific characteristics of the detection object, it can adapt to liquid level detection under various harsh conditions.
6. Low operating costs, no additional shadows, no consumables, and no additional issues such as radiation source depreciation, waste source treatment, and radiation protection compared to isotope level gauges.
7. Lightweight: A high-pressure level gauge working at 32MPa weighs less than two kilograms, which is a fraction of the weight of a high-pressure float level gauge.
8. This liquid level is not suitable for detecting highly viscous media, such as melted asphalt, and is also not suitable for commercial settlement measurement.
4、 Performance indicators
1. Effective liquid level detection range: 0-1Omm to 0-10m (or arbitrarily determined according to user needs).
2. Accuracy: Level 0.5, Level 1.0, Level 1.5.
3. Working pressure: negative pressure, normal pressure, 4MPa, 22 MPa, 32MPa.
4. The working temperature ranges from -50 ℃ to+250 ℃.
5. Applicable medium: Any medium that is non corrosive to polytetrafluoroethylene.
6. Output signal: 4-20mA, DC two-wire.
7. Power supply: The two-wire power supply comes with a 24VDC power supply, and when paired with a secondary meter, the secondary meter is equipped with two wire power supplies.
8. Installation thread: below 22MPa, pressure pad type, M33 × 2; Pressure lens type below 32MPa. M33 × 2 or M24 × 2.
9. Material of structural connectors: chrome plated parts, 1 Cil8Ni9Ti, 316L, Mo2Ti, etc.
5working principle
The detection principle of this liquid level gauge is capacitive conversion type. Its principle: Two parallel plates that are parallel to each other, very close to each other, and insulated from each other form a capacitor. The capacitance of the capacitor changes with the liquid level. The change in capacitance corresponding to the liquid level change is converted into a standard current signal through the transmission circuit, and output to the secondary meter to display the corresponding liquid level height.
Basic calculation formula Δ C=(0.885 ····Δ S)/d
In the above formula, 0.885 is the calculation constant, ε is the dielectric constant of the measured medium, △ S is the product of the depth of the medium surface, and d is the distance between the two poles.
In the above formula, the invariant is ignored, and the conversion formula can be simplified as Δ C=Δ S=>Δ C=∏ R2=>Δ C=Δ H, which means that only Δ H causes changes in liquid level, and the change is independent of temperature and pressure.
VI The capacitive liquid level structure consists of a transmission circuit, structural connectors, probe rods, etc.

7、 Wiring
The wiring between the transmitter and the secondary meter should be carried out according to the following diagram, and the wiring must be verified to be correct to prevent power failure after power supply
Normal operation or damage to circuit components.
For the use of transmitter and probe packaging, the transmitter housing must be reliably grounded, and between the transmitter and probe
The one marked as grounded in the connection should also be reliably grounded.
The two terminals labeled CA and CB in the transmitter are for easy on-site inspection. CA is the signal output of the sensing probe
The end, CA, and ground (transmitter housing) form a signal capacitance that varies with the liquid level. C is the transmitter signal input terminal, CB and
The ground forms the signal capacitor input terminal. During normal operation, CA and CB have been short circuited with wires, allowing the signal capacitor to be input into the transmitter. When the liquid
When the position is not working properly, the short circuit can be disconnected to determine whether the problem lies in the probe or the transmitter circuit.
When configuring a universal light column display secondary meter, a capacitor with a withstand voltage greater than 50V and a capacity greater than 100 microfarads can be connected in parallel to the signal output terminal of the secondary meter to eliminate possible light column virtual oscillation.