Model R7140
INSTRUMENTS
Photo-Contact
Tachometer
Instruction
Manual
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INSTRUMENTS
Table of Contents
Features .........................................................................................2
Specications .............................................................................3-4
Instrument Description .................................................................. 4
Operating Instructions ................................................................4-5
Battery Replacement ..................................................................... 6
Features
• Dual function unit with both contact and non-contact capabilities
• Provides fast and accurate RPM measurements of rotating objects
and surface speed measurements m/min (meter per min) and ft/min
(feet per min)
• Internal memory holds last reading for 5 mins and recalls
min/max and last value
• LCD Display reverses depending on measurement mode
• Includes reective tape, large and small cone tip adapters, funnel
adapter, wheel adapter, batteries, and hard carrying case
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Specifications
RPM Range Photo: 5 to 99,999
Contact: 0.5 to 19,999
Surface Speed Range 0.05 to 1,999.9 m/min
0.2 to 6,560 ft/min
Resolution Photo: 0.1 RPM (≤999.9) / 1 RPM (≥1000)
Contact: 0.1 RPM (≤999.9) / 1 RPM (≥1000)
Surface: 0.01 m/min. (≤99.99m/min.) /
0.1 m/min. (≥100.0m/min.)
0.1 ft/min. (≤999.9 ft/min) /
1 ft/min. (≥1000 ft/min)
Accuracy ±(0.05% + 1 digit)
Visible Indicator Yes (Light)
Optimal Target Distance 2 to 6” (50 to 150mm)
Maximum Target Distance 1.0 ft (300mm)
Response Time <1 sec
Sampling Time: Photo: 1 sec (over 60 RPM)
Contact: 1 sec (over 6 RPM)
Display Size/Type: 5 Digit LCD Display
Auto shut-off: Yes
Internal Memory: Max, Min and Last
Low Battery Indicator: Yes
Power Supply: 4 x AA Batteries
Product Certications: CE
Operating Temperature: 32 to 122°F (0 to 50°C)
Storage Temperature: -4 to 140°F (-20 to 60°C)
Operating Humidity: 10-80%
Dimensions: 8.5 x 2.6 x 1.5” (215 x 65 x 38 mm)
Weight: 10.6oz (300g)
Note: When using the test wheel, accuracy can be affected 0.5% of reading.
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INSTRUMENTS
Optional accessories: Replacement Measuring Wheel (AS-35C)
Replacement Cone Tip (CONE)
Replacement Funnel Tip (FUNNEL)
Replacement extension Shaft (EXT-SHAFT)
Reective Tape (RT100)
Soft Carrying Case (CA-05A)
Hard Shell Carrying Case (R9940)
Instrument Description
1. Reective mark
2. Signal light beam
3. Monitor indicator
4. Display
5. Measure button
6. Memory call button
7. Function select switch
8. Rotating ring
9. Circumferential speed ring
10. Battery Compartment
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INSTRUMENTS
Operating Instructions
Photo Tachometer Measurement
1. Slide the Function switch to the RPM (Photo) position
2. Place the reective marking (tape) to the object being measured
3. Press the Measure button and align the visible light beam with the
reective mark
4. Ensure that the Monitor indicator lights when the target passes
through the light beam
5. Release the Measure button when the reading stabilizes
(about 2 seconds)
In order to obtain greater accuracy for measurement of less than 50 RPM,
use 2 or 3 pieces of reective tape and then divide the reading with the
number of pieces used to calculate the nal gure.
Contact RPM Measurement
1. Slide the Function switch to RPM (Contact) position
2. Press the Measure button while lightly pressing the rotating
device
3. Release the Measure button when the reading stabilizes (approx.
2 seconds)
Contact Surface Speed Measurement
1. Slide the Function switch to m/min. (Surface Speed) or ft/min.
(Surface Speed)
2. Press the Measure button and simply attach the surface speed
test wheel to the detector
3. Release the Measure button when the reading stabilizes
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Memory Call Button Operation
The minimum, maximum and the last (nal) readings are automatically
stored during measurement. These values can be recalled anytime by
pressing the Memory Call buttonTo recall the stored value, follow these
procedures:
1. Press the Memory Call button once to display the last reading.
The symbol “LA” will appear on the display.
2. Press the Memory Call button once again to display the
maximum value. The symbol “UP” will appear on the display.
3. Press the Memory Call button once more to display the minimum
value. The symbol “DN” will appear on the display.
Max Value
Display
reading
Measuring Time
Last Value
Min Value
Battery Replacement
When the left corner of the LCD display shows LO BAT “ ”,
it indicates the battery output less than 4.5VCC and replacement of the
battery is then needed.
1. Open the Battery Cover at the back of meter and remove the
battery
2. Replace with 4 x 1.5 V AA/UM-3 batteries and reinstall the cover
For service on this or any other REED product or information on other
REED products, contact REED Instruments at info@reedinstruments.com
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