Extech Instruments 461950 User manual

USER GUIDE

Panel Mount Digital Tachometer

Model 461950

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Introduction

Congratulations on your purchase of the Extech 461950 Panel Tachometer. This meter displays
continuous readings from 5 to 99,990 rpm. Single pulse activation eliminates the need for special
gears when setting up the meter in any given application. Models 461955 (proximity sensor) and
461957 (photoelectric sensor) are also covered in this manual. Careful use of these devices will
provide years of reliable service.

Specifications

Model 461950 Panel Tachometer

Range 5 to 99,990 RPM

Resolution 0.1 (5 to 999.9); 1 (1000 to 9999); 10 (10.000 to 99,990)

Accuracy 0.05% + 1 digit (of reading)

Display 0.56 " (14.3mm) 4-digit (9999 count) LED display

Display update rate Once per second

Power 110/220VAC; 50/60Hz ±15%

Panel cutout dimensions 3.62 x 1.77" (92 x 45mm)

Bezel dimensions 3.78 x 1.89 x 0.2" (96 x 48 x 5.1mm)

Meter dimensions/Weight 3.78 x 1.89 x 4.33" (96x 48 x 110mm); 11.7 oz. (332 g)

Model 461957 Photoelectric Sensor

Range Up to 6000 RPM (100 Hz)

Power 12 - 24VDC ±10%; Consumption: 40mA max.

Response time < 1ms

Output NPN transistor; Max load 80mA

Photo beam color Green

Photo beam wavelength 5500 Angstroms

Cable length 6 ft (1.8 meters)

Model 461955 Proximity Switch

Range Up to 36,000 RPM (600 Hz)

Power 12 – 24VDC ±10%

Power Consumption 10mA max.

Object distance detection 0.1" (3 mm) maximum target distance

Object size detection 0.07 x 0.11" (2 x 3 mm) minimum size detected

Cable length 6 ft (1.8meters)

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Mounting Instructions

Panel Meter Mounting

1. The 461950 dimensions are:

Meter: 3.78 x 1.89 x 4.33” (92 x 42 x 90 mm)

Bezel: 3.78 x 1.89 x 0.2” (96 x 48 x 5.1 mm)

2. Prepare a panel cutout with the following dimensions: 3.62 x 1.77" (92 x 45 mm).

3. The Tachometer will fit a standard 1/8 DIN cutout. Mounting hardware is provided which
attaches to the sides of the meter. The screws attached to the mounting bracket should be
tightened to the back of the panel (avoid over-tightening which can bow the meter housing).

Proximity Switch Model 461955 Mounting

Use the mounting holes to secure the proximity switch to the desired surface. The sensor is the side
of the switch that detects a moving metal object such as a gear tooth or a fan blade. The sensor
side of the switch has an X on it and is located on the opposite side of the switch from the wiring
cable. Refer to the top view diagram below. The Proximity switch must be mounted so that the
object being detected passes within 0.16" (4mm) of the sensor side of the switch. The pulse LED
will light when the sensor detects a metal object.

Photoelectric Sensor Model 461957 Mounting

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.

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Wiring Instructions

The Model 461950 has seven screw terminals for AC power, sensor input, and sensor excitation.

Model 461955 Proximity Switch Wiring

1. Brown wire (10 - 30V supply signal) to terminal 3 on the panel tachometer (+12V)

2. Black wire to terminal 2

3. Blue wire to terminal 1

Model 461957 Photoelectric Sensor Wiring

1. Brown wire connects to terminal 3 of the panel tachometer

2. Blue wire connects to terminal 1

3. Black wire (sensor output during high to low transition) or Green wire (sensor output during low

to high transition) connects to terminal 2. Connect one wire only to terminal 2 (black or green)
depending upon which better suits the application.

AC Power Wiring

Meter terminals 5, 6, and 7, are for AC power connections. Connect to terminals 5 and 7 for 220V
applications. Connect to terminals 6 and 7 for 110V power applications. A

Wiring Diagram

NOTE: Fusing and electrical noise preventative devices such as MOVS, RC networks, and line

filters should be considered by the user when installing to avoid electrical noise interference.

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Meter and Sensor Operation

Meter Operation

Mount and wire the meter as previously described. The Model 461950 Panel Mount Tachometer
was designed to measure and display RPM in the following ranges:

Ranges Resolution

5 – 999.9 rpm 0.1 rpm

10,000 - 99,990 rpm 10 rpm

Extech sensors generate pulses that are counted by the meter and converted to RPM. The meter
computes RPM values based on the number of pulses detected in a given period of time and
provides an RPM display on the 4 digit (9999 count) LED.

Operation of the Proximity Switch Model 491955

The Extech Proximity Switch Model 461955 connects directly to the tachometer's input terminals
and measures up to 36,000 RPM (600 Hz). Proximity switches detect magnetic (ferrous) objects as
they pass the sensor, sending a pulse, one for each pass, to the meter. The pulse LED on the
switch lights with each pass. The meter then calculates RPM and updates the LED display.

Operation of the Photoelectric Sensor Model 461957

Extech Photoelectric Sensor Model 461957 connects directly to the tachometer's input terminals
and measures up to 6,000 RPM (100Hz). When the sensor is properly powered (by the voltage on
terminal 3 of the meter), 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.

Accuracy (of rdg)

±(0.05% + 1 digit) 1000 - 9999 rpm 1 rpm

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Warranty

FLIR Systems, Inc. warrants this Extech Instruments brand device 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 for authorization. Visit
the website for contact information. A Return Authorization (RA) number must be issued before any product is
returned. 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. FLIR Systems, Inc. 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.FLIR 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.

Calibration, Repair, and Customer Care Services

FLIR Systems, Inc. offers repair and calibration services for the Extech Instruments products we
sell. NIST certification for most products is also provided. Call the Customer Service Department for
information on calibration services available for this product. Annual calibrations should be
performed to verify meter performance and accuracy. Technical support and general customer
service is also provided, refer to the contact information provided below.

Support Lines: U.S.

Technical Support: Option 3; E mail:

Repair & Returns: Option 4; E mail:

Product specifications are subject to change without notice

Please visit our website for the most up to date information

FLIR Commercial Systems, Inc.

ISO 9001 Certified

Copyright © 2013 FLIR Systems, Inc.

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

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