LEGEND ST Seed Sensor

Product catalog summary

Product Description
The Agtron ST Seed Sensor is available in two models: the 32mm (1 ¼”) ST32E and the 25mm (1”) ST25E. Both models share identical cable and enclosure dimensions.

Connector Pin-outs
The sensor features a connector with the following pin functions:

Pin 1: Ground
Pin 2: Sensor Communications
Pin 3: Power
Pin 4: Programming (only with Agtron programmer) or Not used
Pin 5: Sensor Communications
Shell: Shield

Performance Characteristics
The sensor uses four optical detection elements with a sampling frequency of 15 kHz, allowing detection of seed particles as small as 1.5mm at a velocity of 22.5 meters per second. The optical detection zone is 2mm, with a minimum optical cross-section coverage of 40%. Calibration involves 24 steps to adjust optical intensity.

Electrical Characteristics
Absolute Maximum Ratings:

Ambient Temperature: -30°C to +85°C
Storage Temperature: -40°C to +105°C
Supply Voltage: 7.0V to 18.0V
Maximum Current Consumption: 125 mA @ 7V supply

Operational Ratings:

Ambient Temperature: -20°C to +50°C
Supply Voltage: 5.0V to 16.0V
Nominal Current Consumption: 65 mA @ 12V supply

Communication Interface
The sensor uses a paired shielded RS485 data link with a baud rate of 250Kbaud. It supports bidirectional communication, enhancing error detection and fault resistance. Diagnostic data includes input voltage, micro temperature, regulated voltage, runtime timer, detector bias levels, calibration levels, emitter current output, software version, hardware version, and sensor type.

Compliance Standards
The sensor complies with ISO 15003 and various environmental and mechanical standards, including cold and dry heat, damp heat, particle impact, mechanical shock, vibration, corrosive atmosphere, and IP67 rating.

Catalog excerpts

Agtron ST Seed Sensor Datasheet Rev 04 Product Part Number Description

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Physical Dimensions Note: 32mm (1 ¼”) version shown. Cable and enclosure dimensions are identical for all hose sizes. C:\D\My Documents\brochures and advertisements\Legend\ST sensor datasheet rev04.doc

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4 Programming (used only with Agtron programmer) Shell Shield Pin # Function 1 Ground 2 Sensor Communications 3 Power 4 Not used 5 Sensor Communications Shell Shield C:\D\My Documents\brochures and advertisements\Legend\ST sensor datasheet rev04.doc Page 3 of 5

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Performance Characteristics Optical Detection Elements…..………………………………………..4 Optical Sampling Frequency (1) ..……………………………………. 15 kHz Optical Detection Zone………………………………………………… 2mm Minimum Particle Detection Size .……………………………………. 1.5mm Minimum Optical Cross Section Coverage .………………………….40% Optical Calibration Steps (2).………………………………………….. 24 steps Note 1: 15kHz sampling frequency allows the detection of a 1.5mm seed particle at a velocity of 22.5 meters per second. Note 2: Calibration steps and range allow the sensor to adjust the optical intensity to compensate for foreign material build up on the...

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Diagnostic Data - Input Voltage - Micro Temperature - Regulated Voltage - Runtime timer - Detector bias levels - Detector calibration levels - Emitter current output - Software version - Hardware version - Sensor type Bidirectional communications allow for enhanced error detection and fault resistance. A single break or intermittent in the communication loop does not affect performance of the sensor loop because data can be rerouted in the reverse direction. C:\D\My Documents\brochures and advertisements\Legend\ST sensor datasheet rev04.doc Page 5 of 5

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LEGEND ST Seed Sensor

LEGEND ST Seed Sensor

Catalog excerpts

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