PROXIMITY LEVEL SWITCHES - MODELS PAC-30U and PDC-30

BULLETIN 453 (click here to download)

The models PAC-30U and PDC-30 proximity bin level switches are solid state point level devices used to detect the absence or presence of bulk solids. The compact configuration makes this product ideal for tight spaces or low cost level detection. As material comes in contact with, or in close proximity to, the PAC-30U or PDC-30, an internal solid state switch is activated. The PAC-30U is AC operated (20-265 VAC) and is universal in that it is switch selectable for either normally open or normally closed operation. The PDC-30 is DC operated (10-40 VDC) and is available in either PNP or NPN configuration, each of which can be wired in either a normally open or normally closed operation mode.

Principle of Operation

The PAC-30U and PDC-30 are RF capacitance-type level controls, which operate by detecting the electrical effect of the surrounding material such as air, plastic pellets or powders. A radio frequency is applied to the proximity switch sensing region and is continually analyzed to determine the influence of the surrounding environment. Since all materials have dielectric constants and conductance values that are different from that of air, the resultant impedance seen by the radio frequency changes whenever material approaches or contacts the sensing region. This influence is measured within the circuitry and compared with the reference point set by the sensitivity adjustment, which determines how much influence must be present before the output changes.

Optional Mounting Well

Specifications

Warranty

Monitor Technologies warrants each proximity switch it manufactures to be free from defects in material and workmanship under normal use and service within two (2) years from the date of purchase. The purchaser must give notify Monitor of any defects within the warranty period, return the product intact, and prepay transportation charges. The obligation of Monitor Technologies LLC under this warranty is limited to repair or replacement at its factory. This warranty does not apply to any product which is repaired or altered outside of Monitor Technologies' factory, or which has been subject to misuse, negligence, accident, incorrect wiring by others, or improper installation.

DOC-000453A Rev.5.01302009

SafePoint^®
"Truly" Fail-Safe Level Switch

The SafePoint^® rotary paddle level switch with a self-validating design detects material presence plus continuously monitors its own ability to function. The analysis includes sensor health and system power failure, which makes the SafePoint truly fail-safe. The SafePoint incorporates patented use of Hall-Effect technology, dual outputs to indicate both material presence and unit health, and microcontroller technology to continuously protect bulk solids processing and storage from the consequences of unknown sensor failure by providing immediate indication of a sensor failure and confirmation of proper operation.

Other practical features of the SafePoint include rugged construction, motor shut-off when paddle becomes impeded to maximize motor life, twist On/Off cover for bolt free removal, and local status indicating light (except hazardous location models)

A practical application for the SafePoint would be to use this "true" fail-safe product if undetected sensor failure could result in a catastrophic process problem.

Click here for more information on the SafePoint Level Switch or contact Monitor Technologies LLC at 800-766-6486 in the USA and 630-365-9403 worldwide.

>>Click here to learn more about other Point Level Switches from Monitor Technologies

>>Download Product Bulletin 253