Công tắc mức kiểu điện dung, RF capacitive liquid level transmitter 4~20mA

Đăng ngày 29-01-2019 05:28:55 PM - 763 Lượt xem

Mã sản phẩm: RF capacitive 4~20mA

RF admittance level transmitter

I. Overview and application:

The transmitter consists of two parts: detection and transmission. Detected by the probe part of the protective sleeve, sensors; part by the transmitter oscillator, a demodulator, an amplifier, a voltage-current transfertransducer, the instruction sheet, the housing and other components. The oscillator generates an RF voltage and is applied to a bridge composed of an inductor and a capacitor, which is used to compensate the distributed capacitance of the coaxial cable, and is a capacitance formed between the sensor and the material to be tested and the container. In the initial state, the adjustment is made. The size of the variable capacitor, so that the bridge is balanced, the voltage delivered to the demodulator will be zero. When the level in the container changes, the capacity increases, the bridge loses balance, and is then sent to the demodulator. The voltage will not be zero, and proportional to the bridge imbalance, the signal change caused by the level change, processed by the demodulator, amplifier, converted into a linear current 4 ~ 20mADC current with the measured level, remote transmission Centralized control and recording to the control room to realize automatic control of the process flow.

It can be widely used for continuous measurement of liquid level in petroleum, chemical, metallurgy, medicine, electric power, food, paper and other industrial fields.

Second, product features:

Unique circuit design: Reliably measure almost all process media levels without being affected by changes in temperature and humidity on the sensor.

RF admittance technology: high reliability, versatility, no fragile moving parts, and long service life.

Wide range of applications: measurement of liquid level, granular materials, viscous materials, mixed media for almost all applications.

Large measuring range: 300mm~30m is available.

Simple and convenient to install: easy to debug, low cost, no need to provide separate bypass pipes, sealing materials and various valves, all of which can be installed by overhead.

Variety of electrodes: highly chemically adaptable probes, rigid, flexible, with heavy hammer or with fastening

A variety of structural forms: separate, integral, elevated

Third, technical parameters:

Installation method: Thread: threaded integrated installation, threaded split installation

Flange: flange integrated installation, flange split installation

Measuring range H(m): can be arbitrarily selected within the range of 300mm~30m)

Working pressure (MPa): 1.6, 2.5, 4.0

Connection method: pipe thread, flange optional

Wetted material: probe 316L, 1Cr18Ni9Ti

Threaded flange: 316, 1Cr18Ni9Ti

Working temperature: -20~250°C

Accuracy: +1%

Input voltage: rated voltage 24VDC minimum input voltage 15V maximum input voltage 32V

Output signal: 4~20mA two-wire system

Load resistance: rated load resistance 250Ω

Ambient temperature: –40 to +75 °C

Electrical interface: M20 × 1.5 internal thread

Relative humidity: ≤85%

Explosion-proof mark: explosion-proof type

Tình trạng sản phẩm:

Fourth, product parameters

Electrode type	Installation method	Material	Pressure	Temperature
A	3/4” NPT	316S.S	3.5lkg/cm2	121 ° C
B	3/4” NPT	Teflon/SS	3.5lkg/cm2	121 ° C
D	11/4" NPT	316S.S	Atmospheric pressure	121 ° C
E	11/4" NPT	Teflon/SS	Atmospheric pressure	121 ° C
H	11/4" NPT	Teflon/SS	Atmospheric pressure	121 ° C
I	11/4" NPT	Teflon/SS	3.5lkg/cm2	121 ° C
M	11/4" NPT	PVC/SS	3.5lkg/cm2	60 ° C
N	1"	Teflon/SS	3.5lkg/cm2	121 ° C
P	1"	316S.S	3.5lkg/cm2	121 ° C