Sensi-Tron - Eletronic Part Sensor

The Model 8800 Series Sensi-Tron Part Sensor is a versatile medium speed parts detector. It indicates either the presence or the absence of parts and provides appropriate external control outputs.

Common Applications

Counting

Model 8809 Reflective Probes are often used for the DETECTION of part surfaces.

Track Level Monitor

Model 8820-8823 Standard Probes are applied when multiple parts need to be detected.

Basic models available (both as 120 or 240 Volt units) include:

Enclosed Model 8800 Series
Circuit Board Model 8806 Series

Control Outputs

The Model 8800 Series Sensi-Tron Part Sensor's versatile output structure controls vibratory feeders or other equipment. A DPDT relay provides both a SWITCHED AC output and a set of isolated SPDT contacts. A separate 12 Volt DC output can be used to interface to Automation Devices' Model 6000 Series Controller or to any Programmable Logic Controller (PLC).

In addition, a 12 Volt DC Counter Output is available to drive an external accumulating parts counter. Independent of the state of the Control Outputs, it accurately counts up to 100 parts per second. This is considerably faster than the Control Outputs can function.

Sensor Inputs

The Model 8800 Series accepts two input types:

LED/Photo-Transistor probes such as ADI's:
- 8820 (LED Probe) and 8821 (Receiver Probe)
- 8809A (Reflective Probe)
- 8815 (Proximity Probe)
Open collector-type Three-Wire proximity devices (NPN current sinking). Their operation can be capacitive, inductive, or reflective.

The LED Source Probe emits an invisible beam of light in the infrared spectrum. These emissions are sent out as a series of pulses at a fixed rate of speed. The Photo Transistor Receiver Probe (or Element) detects these emissions. The receiving circuit is synchronous with the pulse rate of the Source Probe. This feature significantly reduces false signals from external light sources.
The maximum distance between LED probes is 12 inches for an opposed head configuration.

Light and Dark Operating Modes

There are two basic operating modes of the Model 8800 Series: Light and Dark as selected by the slide switch SW1. Based on the type of probe(s) being used, the Control Outputs will then become active either when the target or object is being sensed (presence of a part) or when the object is not being sensed (absence of a part).

On/Off Time Delays

The ON and OFF time delay settings function in conjunction with the LIGHT and DARK operating modes. The basic purpose of these delays is to allow the uninterrupted flow of individual parts, but yet to interrupt the parts feeding source if there is no part movement (i.e., the track is full).

Each Time Delay functions separately and each has an adjustable SHORT or LONG time delay range (selected with SW2) as follows:

short - a 12.5 to 800 millisecond delay, or
long - a 400 millisecond to 16 second delay.

Specifications

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Model 8800 Series Instructions

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