Rf Admittance Level Switches Manufacturers, Suppliers, Exporters in India

ABOUT LSY

Trumen RF admittance type point level switch model LSY suitable for bulk solids, powder , clinker and even with harsh enviornment conditions and up to 600 degree process temperature.

Trumen LSY available with PTFE or Ceramic insulation rod probe or ﬂexible rope probe depends on the process requirement.

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ABOUT TRUMEN

Trumen came into existence in 2009 and initially started with manufacturing of Tuning Fork Level Switches for liquid and solid applications.
With time, the manufacturing range increased with addition of Capacitance Level Transmitter & Capacitance Level Switches, RF Admittance Level Switches, Rotating Paddle Level Switches, Conductivity Type Level Switches, Vibrating Rod Level Switches, Hydrostatic Level Transmitter, Radar.

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FEATURES

Trumen admittance probe compact in size.
Easy and auto calibration.
Universal power supply on same terminal (15 to 80VDC or 15 to 260VAC).
Inbuilt settable switching delay 5 sec.
Active build-up compensation against material build-up
Customized process connection threaded/ﬂanged/ hygienic etc.
Static charge safe for ﬂy ash, plastic and other applications.
Tropicalized sealed electronics module & easy to maintenance
Various output options like transistor PNP/NPN, NAMUR, 8/16mA current output etc.

APPLICATION

Trumen RF admittance level switch model LSY can be used in bulk solids and powder like cement, ﬂy ash, hot clinker, lime stone and material having coat forming tendency.
Flush mount probe construction for small insertion to avoid heavy impact of lumps, rocks and bolder etc.
Process temperature maximum 250° C with PTFE insulation and 600° C with ceramic insulation.
Operating pressure 20 bar maximum.

Clinker

Cement

Fly ash

Salt

OPERATING PRINCIPLE

RF Admittance is a static level sensor with no moving parts. Its sensing parts are:

…which from the capacitances:-

A Sine wave of high frequency is fed into both Sensing Rod as well as Compensation Shield. Voltage at shield is equal to voltage at sense, no effective current ﬂows between sense and shield.

This same voltage or equi-potential drive to sense and shield removes shield-sense capacitance from the measurement. Shield-earth capacitanceis ignored by circuit. This removes the effect of material coating on probe.

A Sine wave of high frequency is fed into both Sensing Rod as well as Compensation Shield. Voltage at shield is equal to voltage at sense, no effective current ﬂows between sense and shield.

Which makes the probe selectively sensitive and by virtue of electrostatic loading of shield, it actually makes admittance device reverse sensitive in the shield-earth region.

Since, level is detected by measuring sense-earth capacitance only, level is not sensed until sufﬁcient amount of material covers sense & earth combined.

A Sine wave of high frequency is fed into both Sensing Rod as well as Compensation Shield. Voltage at shield is equal to voltage at sense, no effective current ﬂows between sense and shield.

Since, level is detected by measuring sense-earth capacitance only, level is not sensed until sufﬁcient amount of material covers sense & earth combined.

OPERATION

Device operation and settings:
Trumen

LSY probe is make with three elements sense element, shield
element and ground element i.e. process connection either
thread or ﬂanged.
Installed the LSY in to tank properly and make sure sensor ground
i.e. process connection should be connected to the metalic tank
or hopper or silo. In case of non metallic tank we need to provide
external metallic ground for better operation of LSY.
Open the cover of Trumen LSY and you can see there are 9
terminals. Terminal 1, 2 & 3 are for auxiliary power supply. Terminal
4, 5, 6 & 7, 8, 9 for relay output.

There are 6 DIP switches provided on connection panel Via DIP
Switch no.1 we can calibrate the instrument in air or in material.
Switch no. 2 is to set dry delay.
Switch no. 3 is to set wet delay.
Switch no. 4 is to set fail safe.
Switch no. 5 is to set sensitivity 2pF or 8pF selectable For small probe or low dielectric material keep the DIP Switch no. 5 is in OFF position for 2pF sensitivity, And for material containing moisture like animal feed, wheat ﬂour, cement or any high dielectric material keep the DIP Switch No. 5 is in ON position for 8pF Sensitivity.
Switch no. 6 is to set auto calib means instrument can be calibrate automatically in material.

Connection Terminals

+ of DC or Live of AC Supply input
– of DC or Neutral of AC Supply input Supply:
15 to 80VDC or 15 to 260VAC 50/60Hz
Earth terminal for safety
Normally connected terminal of contact 1
Common terminal of contact 1
Normally open terminal of contact 1
Normally connected terminal of contact 2
Common terminal of contact 2
Normally open terminal of contact 2

Connect the power supply either 15 to 80VDC or 15 to 260VAC on terminal 1 & 2. Connect the earth on terminal 3 and switch on the power.
Trumen LSY is ready to calibrate in air make sure that material should be below the sensor. You can see led 1 of process bar blink continuously and alarm led is in off condition.
Now we turned on the switch no.1 to calibrate LSY in air.
The process bar will animate for 5 second After 5 sec all 6 leds are turned on.Now the 6th led of process bar start blinking and turned off.
This means that the device is setting itself 1pF insensitive when led is blinking and 2pF insensitive when led is turned off per led to current level for 2pF sensitivity.
Turned off the switch no.1 when 3rd led of process bar is blinking. Now The device setting itself 5pF insensitive to current level for 2pF sensitivity. The sensitivity selection is applicable for low dielectric or dry materials like ﬂy ash, hot clinker, plastic chips etc.
Now we ﬁll the material solid or powder up to the probe level.
You can see the process bar leds starts blinking and turned on one by one from 1 to 6 Once.
The 6th LED turn on, immediately alarm led also turned on means material touches the probe.
Relay status also change from NC to NO.
Now we empty the material, you can see the process bar led start blinking and turned off from 6 to 1 and alarm led also turned off means material goes below the probe level.
Switch no.2 is to set dry delay means off delay.
ON the DIP switch no.2 and empty the material. LSY will wait for 5 sec once the material goes below the sensor and after 5 sec it generate switching. During delay cycle sensor avoids false switching.
Switch no.3 is to set wet delay means on delay. ON the DIP switch no.3 and ﬁll the material. LSY will wait for 5 sec once the material touches the sensor and after 5 sec it generate switching. During delay cycle sensor avoids false switching.
Fail safe can be set via DIP switch no.4 when the probe is installed for high level, Keep the DIP switch no.4 is turned-off, fail safe high or maximum and when the probe is installed for low level keep the DIP switch no.4 is turned-on, failsafe low or minimum.
Auto calib set via DIP switch no.6. For single point and horizontal installation when there is no material on the sensor probe.
Turned ON the switch no.6. All LEDs of process bar will animate for 5 sec.
Then led 1 of process bar blink continuously and other leds are off. Run empty – ﬁll -empty cycle of material once to three times and turned off the switch. Auto calibration process is completed. Now you ﬁll the material and check the switching performance.
You can easily replace the electronics as shown.
In case of any further technical support please contact our sales and support team.