Extech Instruments RPM250W User manual

User Manual

RPM250W Laser Tachometer

Bluetooth® Connectivity with the ExView® Mobile App

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Table of contents

1 Introduction..... ................. ..... ..... ..... ...................... ..... ..... ... 1

2 Safety ... ..... ..... ................. ..... ..... ..... ................. ..... ..... ..... ... 2

3 FCC Compliance ...... ..... ................. ..... ..... ..... ..... ................. 3

4 Product Description . ..... ..... ............ ..... ..... ..... ..... ................. 4

4.1 Meter Parts .. ..... ............ ..... ..... ..... ..... ............ ..... ..... ..4

4.2 Function Buttons ......... ..... ........................... ..... .......... 4

4.3 Display Symbols.... ..... ..... ........................... ..... ..... ...... 5

5 Operation ... ..... ................. ..... ..... ..... ................. ..... ..... ..... ... 6

5.1 Powering the Meter .. ..... ..... ..... ..... ............ ..... ..... ..... .... 6

5.2 Auto Power Off (APO)................ ..... ..... ........................6

5.3 Tachometer (RPM) Measurements ....... ..... ..... ..... ..... ...... 6

5.4 Counter Measurements (with illuminated objects) .............. 7

5.5 Counter Measurements (with external illumination) ............7

5.6 Data Hold Function ..... ..... ...................... ..... ..... ..... ...... 8

5.7 LCD Backlight .......... ..... ..... ..... ................. ..... ..... ..... ... 8

5.8 MAX/MIN Readings in RPM Mode................ ..... ..... ..... ... 8

5.9 Bluetooth Operation .. ................................ .................. 8

6 Maintenance.. ..... ..... ..... ..... ............ ..... ..... ..... ..... ................. 9

6.1 General Cleaning .... ..... ..... ..... ..... ............ ..... ..... ..... .... 9

6.2 Battery Replacement.... ..... ................. ..... ..... ..... .......... 9

7 Specifications.......................... ..... ........................... ..... .... 10

7.1 General Specifications ............. ..... ..... ..... ................. .. 10

7.2 Measurement Specifications .... ..... ..... ..... ..... ............... 10

7.3 Environmental Specifications ....... ..... .......................... 10

7.4 Connectivity Specifications .... ................. ..... ..... ..... ..... 11

8 Two-year Warranty........................... ..... ........................... .. 12

8.1 Calibration and Repair Services.......................... ..... .... 12

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Introduction

Thank you for selecting the Extech RPM250W Laser Tachometer. This meter
measures rotations per minute on equipment such as fan blades, rotors, tur­bines, and similar machinery. The RPM250W is also a counter where items
on a conveyor, for example, can be counted. Measurements are made using
the built-in photo-electric sensor, situated at the top of the meter. Readings
are shown on the backlit LCD.

The meter includes Bluetooth connectivity, MAX/MIN memory (in RPM mode),
auto power off, data hold, Laser pointer, backlit LCD, and tripod mount.

Using the Extech ExView mobile app, you can pair your smart devices with
the meter using Bluetooth. The app and the W Series meters were developed
together for seamless integration. Download the free app from the App Store
(iOS®) or from Google Play (Android™).

This quality instrument is designed to provide years of reliable service, high
accuracy and simple operation. Please visit the Extech website for additional
information and world-class support.

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CAUTION

• Check for damage to the device’s housing, sensor, display, and battery compartment
before use. If obvious damage or abnormalities are noticed, please discontinue use
and return the device for service.

• Do not attempt to open the meter housing or access the sensor module. There are no
user-serviceable components in this device.

• Do not point the Laser beam toward the eyes. See Laser safety label below:

• Replace the batteries immediately after the low battery symbol appears. If the device is
to be stored for a period of months, please remove the batteries and store separately.

• Do not store the device in high temperature or humidity environments, in flammable or
combustible areas, or where a strong electromagnetic field is present.

• This device is CE certified.

Safety

Please read all safety information before using this device

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WARNING

Changes or modifications not expressly approved by the party responsible for compliance
could void the user's authority to operate the equipment.

FCC Compliance

This equipment has been tested and found to comply with the limits for a
Class B digital device, pursuant to part 15 of the FCC Rules. These limits are
designed to provide reasonable protection against harmful interference in a
residential installation. This equipment generates, uses, and can radiate radio
frequency energy and, if not installed and used in accordance with the instruc­tions, may cause harmful interference to radio communications. However,
there is no guarantee that interference will not occur in a particular installation.
If this equipment does cause harmful interference to radio or television recep­tion, which can be determined by turning the equipment off and on, the user is
encouraged to try to correct the interference by one or more of the following
measures:

1. Reorient or relocate the receiving antenna.

2. Increase the separation between the equipment and receiver.

3. Connect the equipment into an outlet on a circuit different from that to
which the receiver is connected.

4. Consult the dealer or an experienced radio/TV technician for help.

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1. Photo-electric sensor and Laser pointer lens

2. Backlit LCD (detailed below)

3. Function buttons (detailed below)

4. Tripod mount

5. Battery compartment

4.2 Function Buttons

Power / Bluetooth button

Long press to switch the device on. Short press to switch off.

With the meter powered, long press to switch Bluetooth on/off.

Short press to switch the meter off directly from the Bluetooth mode.

MAX/MIN and Counter Reset button

In RPM mode, short press to view the MAX/MIN readings; Long press to
clear the readings.

In Count mode, short press to reset the count to zero. The COUNT dis­play text will flash twice.

Data Hold / Backlight button

Short press to freeze/unfreeze the displayed reading. HOLD will display
when data hold is active.

Long press to switch the LCD backlight on/off.

Product Description

4.1 Meter Parts

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Tachometer/Counter and Laser button

Short press to toggle Tachometer (RPM) and Count modes.

Long press to switch the Laser pointer on/off. The Laser pointer symbol

is shown when the Laser is on.

APO ON/OFF With the meter on, long press the power and H buttons to switch APO

on/off. The APO symbol

is displayed when APO is enabled. APO is

reset each time the meter power is cycled.

1. Tachometer/Counter readings

2. Laser pointer symbol

3. Monitor symbol appears when the sensor detects a reflection from the
supplied tape or when an object is counted

4. Data Hold mode

5. Maximum reading

6. Minimum reading

7. Low battery symbol

8. Auto Power Off (APO) symbol

9. Bluetooth active

10. Tachometer (RPM) and Counter (COUNT) modes

Product Description

4.3 Display Symbols

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to switch the meter on. Short press the power
button to switch the meter off. If the meter does not switch on, check the bat­teries for proper orientation.

When the low battery symbol

appears on the display, replace the batteries

immediately to ensure accurate readings.

5.2 Auto Power Off (APO)

The meter switches off automatically five (5) minutes after the last button
press.

The default mode for APO is ON (the APO symbol

on the display indicates

that APO is enabled).

To switch the APO function off, with the meter switched on, long press the
power

and H buttons. The APO symbol will switch off, indicating that the

function is disabled. APO is reset each time the meter’s power is cycled.

Repeat this process to switch APO back on manually.

5.3 Tachometer (RPM) Measurements

WARNING

To avoid personal injury and damage to the meter and other machinery, keep a distance of
at least 50 mm (2 in.) between the tachometer and the measured object.

to switch the meter on and short press the

mode button

(if necessary) so that RPM is shown.

4. Switch on the device under test so that it begins moving.

5. From a distance of 2 to 20 in. (50 to 500 mm), point the meter’s sensor

(top) towards the reflective tape. For best results, the vertical angle of inci­dence should be < 30°.

Operation

5.1 Powering the Meter

The meter operates on three (3) 1.5 V (AAA) batteries, installed in the rear
compartment.

Long press the power button

1. Switch off the device under test so that it is not moving.

2. Cut off a 0.5 x 0.5 in. (12 mm x 12 mm) piece of reflective tape (supplied)

3. Long press the power button

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appears on the LCD.

7. The five-digit LCD read-out shows the RPM measurement.

8. If the measurement is > 99,999 RPM, OL will appear on the display in

place of a reading.

to switch the meter on.

2. Short press the mode button

so that COUNT is displayed.

3. Position the meter 2 to 20 in. (50 to 500 mm) from the object under test.

For best results, the vertical angle of incidence should be < 30°.

4. Switch on the machinery under test so that it begins moving.

5. Each time an illuminated object passes the meter sensor, the count incre-

ments by 1 and the monitor symbol

appears.

6. Short press the MAX/MIN button to reset the counter to zero (COUNT will

flash twice).

7. When the counter is > 99,999 units, OL will display.

5.5 Counter Measurements (with external illumination)

1. Long press the power button

to switch the meter on.

2. Short press the mode button

so that COUNT is displayed.

3. Long press the Laser button

to switch off the Laser.

4. Position the meter 2 to 20 in. (50 to 500 mm) from the object under test.

For best results, the vertical angle of incidence should be no greater than
30°.

5. Position the external optical source opposite the meter, on the other side

of the device under test (so the device under test is situated between the
meter and the light source).

6. Switch on the device under test so that it begins moving.

7. As each object passes between the meter sensor and the optical source,

the count increments by 1 and the monitor symbol

appears.

8. Short press MAX/MIN to reset the counter to zero (COUNT will flash

twice).

9. If the count > 99,999, the display will show OL in place of a reading.

Operation

6. When the sensor detects a reflection from the tape, the monitor symbol

NOTE

When measuring < 50 RPM, the period of the pulse is quite long and requires that the meter
be kept still to ensure accuracy. Wait at least two pulse signals for the best accuracy. If the
pulse is longer than 7 seconds, the RPM reading will not change.

5.4 Counter Measurements (with illuminated objects)

1. Long press the power button

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to switch the display backlight on or off.

Excessive use of the backlight will shorten battery life.

5.8 MAX/MIN Readings in RPM Mode

In RPM mode, short press the MAX/MIN button to step through the MAX/MIN
memories.

To clear the memory, long press the MAX/MIN button while either the MAX or
the MIN mode text is showing. The memories are cleared each time the meter
power is cycled.

5.9 Bluetooth Operation

Long press the Bluetooth button

with the meter on, to switch Bluetooth on

or off. This communication symbol

is shown when Bluetooth is on.

The Bluetooth utility allows you to remotely monitor readings on an iOS or An­droid smart device using the Extech ExView mobile app designed for use with
this meter.

Download the ExView mobile app from the App Store for iOS devices or from
Google Play for Android devices. Instructions for mobile app use are available
from the ExView product page on the Extech website (link below).

Switch APO off when using Bluetooth by pressing and holding the power

and H buttons for 2 seconds (the APO symbol will switch off). This will pre­vent the meter from automatically switching off while you are logging data or
monitoring readings in real time on your smart device.

Operation

5.6 Data Hold Function

Short press the Data Hold (
ings. While Data Hold is active, HOLD will appear on the LCD.

5.7 LCD Backlight

Long press the backlight button

H) button to freeze/unfreeze the displayed read-

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CAUTION

Warning: Do not open the meter. Service should only be performed by factory personnel,
there are no user-serviceable components in this device.

appears, replace the batteries immediately, as explained below.

1. Switch the meter off and remove the rear battery compartment cover.

2. Replace the batteries, observing correct polarity. Always use batteries of

the same type.

3. Secure the battery compartment before use.

Do not dispose of used batteries or rechargeable batteries in house-

hold waste.

Maintenance

6.1 General Cleaning

Wipe the housing with a damp cloth as necessary to clean. Do not use abra­sives or solvents to clean this device. The sensor and Laser lens can be
cleaned with a lint-free swab and high quality lens cleaner.

6.2 Battery Replacement

This device is powered by three (3) 1.5 V (AAA) batteries. When the low bat­tery symbol

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appears when batteries are low

Sensor type

Photo-sensitive diode

Measurement distance 2 to 20 in. (50 to 500 mm)

Meter power Three (3) 1.5 V (AAA) batteries

Dimensions 5.4 x 2.2 x 1.1 in. (137 x 55 x 28 mm)

Weight 3.6 oz. (102 g)

Specifications

7.1 General Specifications

Display 5 digit (99999) backlit multifunction LCD

Over range indication OL is displayed when measurements are out of range

Low battery indication Battery symbol

7.2 Measurement Specifications

Specifications apply for the following conditions:

Temperature: 73.4℉ ± 9℉ (23℃ ± 5℃); Relative Humidity: < 90 %

RPM range 0 to 99,999 RPM

RPM reading refresh rate 1 to 7 seconds, depending on speed of device under

Counter range

7.3 Environmental Specifications

For indoor use only

Altitude 6562 ft. (2000 m) max.

Pollution degree 2

Operating conditions 32 to 104℉ (0 to 40℃); < 80% RH

Storage conditions -4 to 140℉ (-20 to 60℃); < 80% RH

Drop-proof rating 3.3 ft. (1 m)

Safety

Laser pointer

test

0 to 99,999

EN 61010-1; EN 61010-031; EN 61326

Class 3R; Output: ≤ 5 mW, 650 nm

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Specifications

7.4 Connectivity Specifications

Connectivity Bluetooth (with ExView app)

ExView app compatibility iOS 13.0 and Android 9.0 or higher

Transmission distance Up to 295.3 ft. (90 m) with no line-of-sight obstruction

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Two-year Warranty

FLIR Systems, Inc. warrants this Extech brand instrument to be free of
defects in parts and workmanship for two years from date of shipment (a six­month limited warranty applies to sensors and cables). To view the full war­ranty text please visit:

8.1 Calibration and Repair Services

FLIR Systems, Inc. offers calibration and repair services for the Extech

brand products we sell. We offer NIST traceable calibration for most of our
products. Contact us for information on calibration and repair availability, refer
to the contact information below. Annual calibrations should be performed to
verify meter performance and accuracy. Product specifications are subject to
change without notice. Please visit our website for the most up-to-date prod­uct information:

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