Melan Measurement & Control Instruments (Shanghai) Co.,Ltd.
MELAN MEASUREMENT & CONTROL INSTRUMENTS (SHANGHAI) CO., LTD.
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Interface Level Measurement Using DP Transmitter
1. Introduction
Capacitive level sensor is based on the change of capacitance to perform liquid/level measurement. The level gauge electrode and the container form two electrodes of a capacitor. The capacitance value varies with the container.
The level of the material medium changes and changes, and is converted to the corresponding level output signal.
A basic requirement for measuring liquid/level with a capacitance level meter is: the relative medium of the measured medium.
The electrical constant (the ratio of the dielectric constant of the measured medium to the air) should not change during the measurement.
2. Configuration
| Type | Specification Code | Illustration | ||
| ML3¨¨¨S | --------------------------------- | Flange Mounting Intelligent Liquid Level & Pressure Transmitter | ||
| Accuracy | 3-------------------------------- | ±0.5% | ||
| 0-------------------------------- | ±0.075% | |||
| Output | 5-------------------------------- | 4-20mA, HART | ||
| Sensor | 1-------------------------------- | Capacitive Sensor | ||
| S-------------------------------- | ||||
| Connection Medium Mode | L-------------------------------- | Mounting Flange Type | ||
| Measuring Range | 4-------------------------------- | 0-6.2~37.4KPa(0-635~3810mmH2O) | ||
| 5-------------------------------- | 0-31.1~186.8KPa(0-3175~19050mmH2O) | |||
| 6-------------------------------- | 0-117~690KPa(0-1.2~7Kgf/cm2) | |||
| Flange Dimension & Isolation Diaphragm | Nominal Diameter | Insertion Depth | Isolation Diaphragm | |
| A0-------------------------------- | 80mm | Flat | 316 SS | |
| A2-------------------------------- | 80mm | 50 | 316 SS | |
| A4-------------------------------- | 80mm | 100 | 316 SS | |
| A6-------------------------------- | 80mm | 150 | 316 SS | |
| B0-------------------------------- | 100mm | Flat | 316 SS | |
| B2-------------------------------- | 100mm | 50 | 316 SS | |
| B4-------------------------------- | 100mm | 100 | 316 SS | |
| B6-------------------------------- | 100mm | 150 | 316 SS | |
| C0-------------------------------- | 80mm | Flat | Hastalloy C | |
| C2-------------------------------- | 80mm | 50 | Hastalloy C | |
| C4-------------------------------- | 80mm | 100 | Hastalloy C | |
| C6-------------------------------- | 80mm | 150 | Hastalloy C | |
| D0-------------------------------- | 100mm | Flat | Hastalloy C | |
| D2-------------------------------- | 100mm | 50 | Hastalloy C | |
| D4-------------------------------- | 100mm | 100 | Hastalloy C | |
| D6-------------------------------- | 100mm | 150 | Hastalloy C | |
| E0-------------------------------- | 80mm | Flat | Tantalum | |
| F0-------------------------------- | 100mm | Flat | Tantalum | |
| Flange Dimension | A-------------------------------- | 3" 150lB | ||
| B-------------------------------- | 4" 150lB | |||
| C-------------------------------- | 3" 300lB | |||
| D-------------------------------- | 4" 300lB | |||
| Q-------------------------------- | Other requirements | |||
| Display Header | D-------------------------------- | Multiple Parameters and Methods Digital LED Display Header | ||
| N-------------------------------- | No Display Header | |||
| Electrical Interface | 5-------------------------------- | M20*1.5 Waterproof Concentrator | ||
| Additional Type | -NF1---------------------------- | Ex-proof Security Certification: Exd II CT6 | ||
| -NS1---------------------------- | Intrinsic Safety Certification: Exi II CT4 | |||
| -M------------------------------- | Other requirements are available | |||
| Remarks: | ||||
| e.g.:ML3051SL-5A0AD5-NF1 | ||||
3. Dimension
The flange gasket is chosen by customers according to connecting liquid medium features. Our company recommends Asbestos Rubber,Nitrile Rubber, Fluorine Rubber, Nylon, Teflon and so on.
4. Pressure Level Transmitter
Gauge Pressure Transmitter
Differential Pressure Transmitter
Capacitance Level Transmitter
Hydrostatic Level Transmitter
Submersible Level Transmitter