AVI-PSM SMART RF admittance level switch

AVI-PSM Series smart RF admittance level switch, used for most level measurements and control. It is suitable for almost all industrial or civil applications where measuring level of liquids, powders, slurries and interface. The

equipment can be either installed indoor or outdoor, no special mounting requirements needed. 

The product adopts an unique technology base on our intelligence hardware design, guarantees the effective process level identify and judgment. 

It has an patented universal power supply could be used both for AC and DC power connection, normally all industry field standard power i.e. 220VAC/110VAC/24VDC can be all directly connected to the two terminals on the left of the unit (No polarity needed).     

Operation Principle

As stems from capacitance level control technology, the Radio frequency admittance technology is a more advanced  level control technology with a better coating rejection ability (material adhere on the sensing element

is called as coating)、more reliable operation、higher accuracy、wider application. “Admittance” in “Radio

frequency admittance” means the reciprocal value of the impedance in electricity, it includes resistance、capacitance and inductance. While “Radio frequency” means high frequency, so the radio frequency admittance could be understand as a method to measure admittance through high frequency current.

The main difference between the point Driven Shield Radio Frequency level technology and capacitance technology is the point Driven shield RF technology  employs a three terminal technique and measure multiple variables which not only resolve the temp. Drift of the coaxial cable stray capacity also ignore the build-up on the sensing element. 

Characters 

Free calibration: No field calibration needed 

Universal power supply: 20~27VDC and 30~265 VAC all workable   

Free maintenance: No period maintain or replacement needed as other paddle、vibration or mechanical switches,

the parts will not occur block、broken or abrasion. 

Coating rejection: Driven-shield electronic design makes the instrument ignore the coating affection on the vessel

wall or sensing element, no period clean or re-calibration needed.

Wide application: process temperature could run from -183℃~815℃, process pressure could be vacuum~100bar.

Three color LED indication: red-alarm, green-normal, yellow-instrument failure, real-time indication 

Quick electrical connection: double electrical connections make the wiring more safe and convenient.

Better drive ability: center rod to shield 500Ω, shield to ground 150Ω

Spark protection: Built-in 1000Vspark protection、surge and burst limitation 4KV/8KV to assure electronic unit

work properly and away damage. 

Electronic unit: Hockey-pock design makes it easier to install and work more reliable.

Easy installation: instrument could be mounted in the field through the vessel screw or flange, could be selected as

integral or remote configuration, easy for installation and calibration. 

Typical application

Liquid: conductive and insulating liquid(include liquefied gas) 

Slurry: conductive and insulating slurry 

Granular: food、plastic chips、coal etc.

Interface: liquid interface between two different dielectric constants 

Powder: plastic powder、cement or fly ash etc. 

Specification:

Measuring rate of facility: measurement category II, transient rated voltage 2500V. Do not use the equipment for measurements out category I and II.

Output: DPDT reply (double pole double throw)

Contact Rating: 250VAC: 1A inductive, 3A non-inductive 

Power requirement: 30-265VAC, 50/60Hz or 21-27VDC (No polarity required)

Dissipation power: 2W

Resolution: 0.2 pF or lower

Repeatability: <1mm (0.04”)  (Conductive material)

            <20mm (0.79”)  (Insulating material)

Load resistance (Driven ability): Center wire to shield 500 ohm

Shield to ground 150 ohm 

Fail safe: High (HLFS) or low (LLFS) field adjustable

Indicators: Three states. Red- level alarm; Green-system normal; Yellow-instrument self checking

failure or the probe shield terminal short circuit to the earth.

Response time: less than 1s 

Delay time: 1 ~ 70S in 16 section

Ambient Operating Temp.(electronics) : -40 ~ +70℃ (-40~158℉)

Ambient humidity: <100% RH (while 25℃)

Storage Temp: -40 ~ +85℃ (-40 ~ 185℉)

Re-calibration: Unit could be reset in the field, and then when it power on again, the unit will finish calibration automatically

Process material setting: Be divided into conductive material and insolating material, could be selected in the field.

Range setting: 130pF and 30pF could be selected in the field.

Alarm mode: High or low level alarm and its fail safe function could be selected in the field.

LED output: Red-alarm；Green-normal；Yellow-failure in the system

Barrier: Built-in limiting current, four-limiting voltage barrier

Spark Protection (for probe): 1000V for surge and 4000V/8000V for electrostatic voltage

RFI (Built-in filter): the whole system has passed spatial 10V/m electromagnetic field and 3V/m electromagnetic

field1current infusing tests  

Sensing Element IL: 0.5m (19.7″) standard, 0.1m (3.9″) ~20m (787.4″) optional  

Inactive Length: Max length 50m (164 ft); 50m (1968.5″) ~100m (3937″) consult factory

Cable length: 5m (197″) standard; 0.1(3.9″) ~50m (1968.5″) optional; >50m (1968.5″)~100m (3937″) consult factory

Electrical Connection: Double M20*1.5 (cable diameter less than 12mm, 0.47″), 3/4” NPT optional

Process Connection: Standard:  BSPT(R) Thread, Optional: NPT or flange

Mounting: Vertical, horizontal or any angle  

Ingress Protection: Meets IP67 requirements 

Explosion-proof rating:  Exd [ia]ia IIC T4

Designed elevation altitude: Lower than 2000m (6562ft)

Approvals: NEPSI  

Probe (sensing element) specifications S.E. Mounting