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A specially shaped tuning fork is kept vibrating using piezo-electric elements. The oscillation of the fork damps when in contact with the material. The loss of oscillation amplitude is detected and used for switching a relay. The output contacts of the relay are in turn used for annunciation or control.


Power Consumption: Less than 05 VA

Power Supply: 24V DC, Universal (90-260 V AC)

High temperature durability (H2 – up to 200°C )

Independent of material’s electrical properties

Suitable for detection of underwater chips

Mechanical Specifications

Electrical Specifications

Resonant Frequency

85 Hz

Probe Length

Extensible probe length from 155 mm up to 3000 mm


W: Weatherproof

P5:IP-65 Weatherproof housing

FA:Flame-proof for Gas Groups IIA and IIB


Integral version (Electronics Integral with fork)

Split version (Electronic separated by a special cable)

Separate version (Electronics separated by ordinary 03 core cable)

Process Connection(Mounting Arrangement)

Threaded Mounting: 1-1/2”, 2” BSP/NPT

Flanged Mounting: As per specification

Tri-Clover (as per specifications)

SMS union coupling type

Extension Length

Pipe- GI/SS: 155 mm – 3000 mm

Probe Length

Extension Length + Fork Length (155mm / 185mm / 250mm)

Wetted Parts and Mounting Material

S4: SS-304

S6: SS-316

SL: SS 316L

PT: PTFE Lined

HL: Halar Lined

HC: Hastelloy C

Process Temperature

A (Ambient) below 80°C

H1 (High temperature) up to 150°C

H2 (High temperature) up to 200°C

Input power supply & Outputs

SLM 130/120/110: Single SPDT with (90 – 260 V AC) / 230 V AC / 24 V DC

SLM 130/120/110: One open collector PNP transistor with 24 V DC

SLM 230/220/210: Double SPDT with (90 – 260 V AC) / 230 V AC / 24 V DC

SLM 330/320/310: Single SPDT & Time Delay with (90 – 260 V AC) / 230 V AC / 24 V DC

SLM 630/620/610: Double SPDT & Time Delay with (90 – 260 V AC) / 230 V AC / 24 V DC

Power Consumption

05 VA

Fail-safe Setting

Field selectable (through toggle switch)

Open: Fail-safe High, Close: Fail-safe Low

Response Time

02 – 05 Sec

Time Delay Settings

Cover and Uncover Delay: 02s to 20s, through toggle switches

Sensitivity Setting

Field Selectable (through toggle switches)

Applications Specifications

Application Material For all Industries requiring level limit detection in Free Flowing solids including:

Powders, sand, sugar

Pulverized coal

Food grains


Granular material

Switching Indication

2 LED’s

Red: Alarm, Green: Normal