FEATURES AND BENEFITS

• Multiple independent switch points and relays ideal for sump pump application.
• Solid state electronic unit with no moving parts to maintain.
• Simple installation through a single MNPT or flange probe mount (1.0 inch MNPT standard).
• Local or remote installation for surveillance convenience.

• High temperature operation up to 572° F
  (300° C).
• Can discriminate different liquid products, thus ideal for interface detection.
• Temperature compensated and independent of dielectric, electrical conductance, or other changes in product properties.
• Available in exotic alloys to withstand corrosive products.

Applications

The microtuf® MULTIPOINT level monitoring instrumentation can provide a solution to most any process application where MULTIPOINT level detection is required. Among the industries served by DELTA M are the chemical, petroleum, utility, metal, paper, food, and textile.

Product Introduction

Industries dealing with caustic, corrosive, or other hazardous products under condition of high temperature and / or pressures are faced with a challenge when product levels must be monitored. Process engineers and I & C engineers will appreciate the microtuf® MULTIPOINT level probe as a solution that can meet these challenges head-on.

PRINCIPLES OF OPERATION

The LM3100 MULTIPOINT level switch detects the presence or lack of presence of liquid process products at specific points within a vessel, tank or line. These independent point monitors provide relay contacts to control or alarm systems when each level switch detects a preset change in the presence of the process product.

The LM3100 unit consists of multiple dual element sensing assemblies along a common probe attached to an enclosure housing the electronics and field wiring connections.

Each element of the multi probe assembly contains miniature RTD's (Resistance Temperature Detectors) each tightly encased within a stainless steel tube. One element of each pair is internally heated to establish a temperature differential above the ambient temperature sensed by the other element. Different media have different heat transfer coefficients. Thus, when the liquid process product comes in contact with the heated sensor, the thermal differential is diminished. The unheated element provides a reference to the ambient conditions thus providing temperature compensation over the entire operating range of -100°F to +390°F. When each dual element assembly senses the presence of process product the temperature difference is converted to a voltage which is compared to the adjustable set-point reference voltage for that assembly. When the two values are equal a relay is energized to open or close the alarm or control contacts. Each of the MULTIPOINT switches operate independently of each other.

OPTIONS

Additional options include intrinsic safety, various mounting alternatives, a wide selection of materials of construction, remote electronics, and time delay.