Solid Level Measurement Switch

This tuning fork level switch from Sapcon Instruments, known as the SLM series, is best suited for you if your operational unit involves level limit detection of

• Fine grained free flowing solids including very low density and pneumatically conveyed media, powders, plastic chips, cement, sand, sugar, food grains
• For detecting level of granular solid material submerged in liquids of low viscosity, like sand, gravel, plastic chips under water.
• For applications requiring the processing of different type of material in the same vessel.

SLM series (vibrating fork switch) can indicate a full tank to switch conveyers off and can indicate an empty tank to avoid stoppage of production. Many of our customers in the in cement, power, chemical, man-made fiber and food industries (just to name a few) have used this fork based level switch successfully and have been happy with the rugged performance.

Features of the Tuning Fork based Level Limit Switch (SLM Series)

The SLM series tuning fork level switch / level detector has no moving parts and requires no calibration. The High/Low selection feature is available as a standard feature unlike the instruments from other manufacturers. The level switch is insensitive to material build-up and isn't affected by the electrical properties of the service material. You can choose an enclosure depending on you process plant conditions.We have housing that prevents and protects the fork level switch from explosive conditions, dusty areas and unpredictable weather conditions. What else, we also have a circular enclosure available if you need.

Principle of Operation

A top or side mounted, stainless steel made tuning fork is kept in mechanical vibration at the resonance frequency by piezo ceramic elements. When the service material covers the tines of the tuning fork, vibrations are damped. This is sensed electronically and processed signal is used to energize a relay whose contacts in turn are used for annunciation or control. Two basic type of constructional arrangements are available. One, where the electronics is separated from the fork, the other has them integrated. You can choose from: Mounting arrangement of your choice (screwed or flanged type).

• Various standards of the mounting according to plant conditions
• High temperature versions up to 200° C without the necessity of elaborate cooling arrangements
• Flame proof versions for hazardous areas.

Longer probe length use pipe extension made of GI or SS as required. Integral Versions meant for high temperature operation are provided with a stand-off arrangement for keeping the electronics in a relatively cooler environment. Adjustable probe length type are provided with gland arrangement for making length adjustments.

Microprocessor based tuning fork level switch

The Sapcon Humming Bird is a compact level detector. It is suitable for constricted spaces and is suitable for dusty and hazardous conditions. 

Technical Data

Evaluation Unit

Model Selection SLM.... Series Fork Level Switch