Extech 461957 Operating Manual

User's Manual Photoelectric Sensor

Model 461957

Introduction

Congratulations on your purchase of the Extech 461957 Photoelectric Sensor for use with your Panel Tachometer. This NPN sensor has a 0.4” (10mm) target
distance and a range up to 15,000 rpm (250Hz). This sensor is shipped fully tested and calibrated and with proper use will provide years of reliable service.

Operation

Extech Photoelectric Sensor Model 461957 connects directly to the
tachometer's input terminals and measures up to 6,000 RPM. When the
sensor is properly powered, the green power LED (on the sensor) will
switch on.

Photoelectric sensors generate a light beam that is interrupted by an
object as it passes through the beam. Each time the beam of light is
interrupted a pulse is transmitted to the meter and the red status LED on
the sensor blinks. The meter then calculates and displays the RPM
based on the number of pulses received in a specific period of time.

The sensitivity adjustment screw on the sensor may have to be adjusted
so that one pulse is generated for each interruption of the light beam. If
the red LED turns on less/more than once for each interruption of the
beam, adjust the sensitivity screw.

Mounting Instructions

Use the mounting holes to secure the photoelectric sensor to the desired
surface. The photo beam is generated and detected in the groove (as
depicted by the dotted line in the diagram below). The object under test
must pass in the groove so that the light beam can be interrupted.

1. Sensor

2. Power/Detection
LEDs

3. Sensitivity
Adjustment

4. Mounting Holes

5. Cable

2

3

4

2” (52mm)

1

0.4”
(10mm)

1.57”
(40mm)

5

Wiring Instructions

1. Brown wire connects to +DCV sensor power from the panel
tachometer

2. Blue wire connects to GND (ground) sensor input of the panel
tachometer

3. Black wire (sensor output during high to low transition) or Green wire
(sensor output during low to high transition) connects to positive
sensor input terminal of the panel tachometer. Connect one wire only
to the positive terminal (black or green) depending upon which better
suits the application.

2.5”
(65mm)

Specifications

Range Up to 15,000 RPM

Switching Frequency 100Hz (6000 rpm)

Power

Response time

Output

Photo beam color

Photo beam wavelength 660 Angstroms

Protection IP60

Cable length 6 ft (1.8 meters)

Dimensions 2.5 x 2 x 0.8” (65 x 52 x 20.5mm)

10 - 30VDC ±10%;: 40mA max.

< 5ms

NPN transistor; Max load 100mA

Red

Warranty

EXTECH INSTRUMENTS CORPORATION warrants this instrument to

be free of defects in parts and workmanship for one year from date of
shipment (a six month limited warranty applies to sensors and cables). If
it should become necessary to return the instrument for service during or
beyond the warranty period, contact the Customer Service Department at
[phone] ext. 210 for authorization or visit our website
www.extech.com for contact information. A Return Authorization (RA)
number must be issued before any product is returned to Extech. The
sender is responsible for shipping charges, freight, insurance and proper
packaging to prevent damage in transit. This warranty does not apply to
defects resulting from action of the user such as misuse, improper wiring,
operation outside of specification, improper maintenance or repair, or
unauthorized modification. Extech specifically disclaims any implied
warranties or merchantability or fitness for a specific purpose and will not
be liable for any direct, indirect, incidental or consequential damages.
Extech's total liability is limited to repair or replacement of the product.
The warranty set forth above is inclusive and no other warranty, whether
written or oral, is expressed or implied.



Support line [phone]

Technical support: Extension 200; E-mail: [e-mail]

Repair & Returns: Extension 210; E-mail:

Product specifications subject to change without notice

For the latest version of this User’s Guide, Software updates, and other
up-to-the-minute product information, visit our website: www.extech.com
Extech Instruments Corporation, 285 Bear Hill Rd., Waltham, MA 02451

Copyright © 2006 Extech Instruments Corporation

All rights reserved including the right of reproduction in whole or in part in

any form.

[e-mail]

461957 V1.1 3/06