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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 and/or control.


Low Power Consumption: Less heat, Long life

Independent of material’s electrical properties

Fast switching


Mechanical Specifications

Electrical Specifications

Resonant Frequency

Resonant frequency varies with the length of tines:

Fork Length(mm) Min. Probe Length(mm) Frequency(Hz)
185 200 150
100 135 350

Probe Length

Extensible probe length from 135 mm

135mm, 185mm – up to 3m


W: Weatherproof

P5:IP-65 Weatherproof housing

FA:Flame-proof for Gas Groups IIA and IIB

FC:Flame Proof for Gas Group IIc

Process Connection(Mounting Arrangement)

Threaded Mounting: 1-1/2”, 2” BSP/NPT

Flanged Mounting: As per specification

Extension Length

Pipe- GI/SS : 200mm – 3000mm

Probe Length

Extension Length: + 135mm/185mm

Wetted Parts and Mounting Material

S4: SS-304

S6: SS-316

PT: PTFE Lined

HL: Halar Lined

HC: Hastelloy C

Process Temperature

A (Ambient): below 100°C

H (High temperature): 100°C – 150°C

Input power supply & Outputs

D: Universal Power Supply 18-55 V DC, 90-265 V AC, Single-point two potential free relay outputs rated at 6A

S: Universal Universal Power Supply 18-55 V DC, 90-265 V AC

(1.) Singe-point – Single relay (Rated 6A)

(2.) Open-collector PNP output, max 100mA non-inductive load

M: 24VDC – 8/16 mA 2-wire Loop powered current output

N: 8.2V Namur type current output (ION = 2.2 … 2.5 mA, IOFF = 0.8 … 1.0 mA)

Power Consumption


Fail-safe Setting

Field selectable (through toggle switch)

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

Response Time

0.8s Cover Delay

1s Uncover Delay

Time Delay Settings

Cover and Uncover Delay: 0.8s / 1s to 20s, through toggle switches

Sensitivity Setting

Field Selectable (through toggle switches)

Applications Specifications

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