NH93420 Anti-Corrosion Type Liquid Level Transmitter Pressure Sensor Transmitter
NH93420 series liquid level transmitter is an all-stainless steel design, all-sealed diving solid-state piezoresistive liquid level measurement instrument. The high stability, high reliability piezoresistive pressure sensor, high precision intelligent transmitter processing circuit, precision digital temperature compensation technology and nonlinear correction technology are used in this product. The liquid level signal of the measured liquid is converted into a standard electrical signal output. Waterproof cable and shell sealed connection, pipe in the cable, can be used in liquid for a long time. The integrated structure and standardized signal output provide convenience for field use and automatic control. . The product is small in size, light in weight, easy to install and easy to use. It is suitable for the measurement and control of liquid level in the fields of petroleum, chemical industry, power plant, urban water supply and water temperature exploration.
NH93420 Liquid Level Transmitter Technical Parameter
| Typical applications | Liquid, corrosive liquid |
| Measurement range | | Type | Cable type | Hard rod type | .Cable . anticorrosive | Rod-type anticorrosive | | L (m) | 0~170m | 0~4m | 0~170m | 0~4m | |
| Signal output: | 4~20mADC/HART/RS485 |
| Ambient temperature | -40 〜85 °C |
| Process temperature | -10 ~+70 °C |
| Process connection | thread flange mounting (optional) |
| Power supply | 24VDC (± 5%) |
| Load capacity | < (U-15) / 0.02A |
| Diaphragm material | 316L, ceramic diaphragm (optional) Case material: aluminum, stainless steel (optional) |
| Stability | ±0.05%FS/ year; ±0.1 %FS/ year |
| Field display | LCD (optional) |
| Level of protection | IP67 |
| Blast class | Exia II CT5 Exd IIBT5 (optional) |
※ Note: Products can be customized according to the specific requirements of users!
NH93420 Liquid Level Transmitter Operating Principle
The liquid level transmitter consists of a special gas guide cable built into a capillary hose, a compression joint and a probe. The probe of the level gauge is constructed of a stainless steel core with a diaphragm at the bottom and a plastic shell with holes. The liquid level measurement is actually the difference between the hydrostatic pressure on the probe head and the actual atmospheric pressure, and then the ceramic sensor (attached to the stainless steel film) and the electronic component convert the pressure difference into the 4〜20mA output signal.
When the hydrostatic liquid level transmitter is put into a certain depth of the measured liquid,the pressure formula of the sensor is as follows: PA= p・g・h+Po to obtain the liquid level formula:h = PA- Po/ p*g.
At the same time, the pressure of liquid is introduced into the positive pressure chamber of the sensor through the gas conduction stainless steel, and then the atmospheric pressure on the liquid surface is connected to the negative pressure chamber of the sensor, so as to counteract the Po, on the back of the sensor and make the measured pressure of the sensor PA-Po= p・g・h.
If the density of the liquid is uniform, the static pressure difference is proportional to the height of the liquid level.
NH93420 Liquid Level Transmitter Installation requirements
- When measuring the static liquid level in an open container, the liquid level transmitter is perpendicular to the bottom of the container, and the cable connecting the transmitter and the junction box are fixed at the opening of the container.
- When the water level is measured in flowing water, a pipe with diameter 45mm is inserted into the water, and a number of holes of diameter 5mm are made at different heights in the opposite side of the flow direction of the pipe. The water enters the pipe to fix the cable line and the junction box at the outlet of the pipe.
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Anti Corrosion Liquid Level Pressure Transmitter RS485 0-170m Cable Images
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