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

Proximity Level Switch

Bulletin Button
Solid State Operation
30mm Industry Standard Housing
Available in AC (Model PAC-30U) or DC (Model PDC-30) Configurations
Easy Installation & Calibration
2-year Warranty

 

Proximity Level Switch

 

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

.: Specifications

.: Warranty

.: Optional Mounting Well

   

 

 
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

Optional Mounting Well

 

 
Specifications

Model PAC-30U:

Housing:

Thermoplastic Polyester

Enclosure Protection:

IP67 (NEMA 4 equivalent)

Power Requirements:

20-265 VAC, 45-65 Hz

Mounting Thread Size:

M30 x 1.5

Sensing Distance:

4 to 25 mm adjustable

Indicator:

LED, yellow

Output:

Normally Closed or Normally Open, Switch Selectable

Leakage Current:

<2.5 mA

Load Current:

10-500 mA

Frequency of Operating Cycle:

25 Hz

Operating Temperature:

-13° to 176° F (-25° to 80° C)

Electrical Connections:

Cable, 6ft(1.8m), 18-20 AWG

Max. Pressure:

1.4 psi

Max. Pressure:
(with mounting well)

125 psi

Approvals:

UL/CSA General Purpose; CE Mark

Model PDC-30:

Housing:

Thermoplastic Polyester

Enclosure Protection:

IP67 (NEMA 4 equivalent)

Power Requirements:

10-40 VDC

Mounting Thread Size:

M30 x 1.5

Sensing Distance:

4 to 25 mm adjustable

Indicator:

LED, yellow

Output:

13-8231, NPN (sinking)
13-8241, PNP (sourcing)

Consumption:

<10.0 mA

Load Current:

0-200 mA

Frequency of Operating Cycle:

100 Hz

Operating Temperature:

–13° to 176° F (-25° to 80° C)

Electrical Connections:

Cable, 6ft(1.8m), 18-20 AWG

Max. Pressure:

1.4 psi

Max. Pressure:
(with mounting well)

125 psi

Approvals:

CE Mark

 

 
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

 

 

 
Spotlight: RF Capacitance Level Sensor
TrueCap Level SensorTrueCap Light  
TrueCap® MK-2
Advanced RF Capacitance Level Probe
The TrueCap® Model MK-2 RF Capacitance point level probe is designed to provide a superior and stable sensitivity threshold making it suitable for a variety of powder / bulk solids and some liquid or slurry applications.

Advanced features of the Model MK-2 include:
> Automatic immunity to material build-up on the probe by its driven shield design
> Push-button calibration
> Enhanced temperature compensation
> Maximized reliability via smart sensing algorithms like “self-validating” fail-safe protection
> Visible status LED on ordinary location units
> Versatility through a variety of configuration options including: hazardous location version, split architecture design, quick-connect process connection, stub probe, cable extensions, solid extensions, Nylon® probes, Ryton® - equiv. probes, etc.

A practical application for the TrueCap would be to use this level sensor where a residual material build-up on a different sensor would cause a false material level indication.

Principle of Operation for the TrueCap RF Capacitance Level Probe:
The vessel wall and the active probe element establish an impedance reference between each other when exposed to air which has a dielectric constant of 1. When materials with a dielectric constant greater than 1 are in close proximity to the probe, the impedance of the sensing field between the sensor and the vessel wall will change. Once the amount of change exceeds a threshold that was electronically determined during the calibration process, an output relay will either be energized or de-energized depending upon the position of the fail-safe selector on the probe’s electronic circuit board. A change of as little as .5 pico-farad is all that is necessary for the probe to sense the presence of material.

Click here for more information on the TrueCap MK-2 Level Sensor or contact Monitor Technologies LLC at
Tel.: 800-766-6486 in the USA and
Tel.: 630-365-9403 worldwide.
 
>>Download TrueCap Product Bulletin #413
>>Click here to learn more about other Point Level Switches from Monitor Technologies

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