SPI 31-040-9 Digital Protractor PRO3600 User Manual

1. Introduction

The SPI 31-040-9 Digital Protractor PRO3600 is a revolutionary tool designed to provide immediate digital indications of level, plumb, and angles. It features a light, rigid, and ultra-precise platform, utilizing a state-of-the-art sensor and microprocessor circuit for accurate readings. This instrument is built for durability, precision, and reliability, making it an essential tool for various metalworking and laboratory applications.

Key Features:

Floating zero provides zero selection anywhere within its 360° range.
PRO 3600 features SPC output and excellent accuracy.
Instant LCD Display with resolution of 0.1° up to +/-10°.
Deviation from the true plane is measurable through full 360° (4x90°).
Supplied in a protective plastic case.
Top plate has a V-groove for accurate registration on curved or cylindrical surfaces.

SPI PRO3600 Digital Protractor in its red protective case — Figure 1.1: The SPI PRO3600 Digital Protractor shown with its protective red carrying case.

2. Product Overview

Familiarize yourself with the main components and controls of your SPI PRO3600 Digital Protractor.

Front view of the SPI PRO3600 Digital Protractor showing the display, ON/OFF, and HOLD buttons — Figure 2.1: Front view of the protractor, highlighting the digital display, ON/OFF button, and HOLD button.

Side view of the SPI PRO3600 Digital Protractor showing the serial port and ALT ZERO button — Figure 2.2: Side view of the protractor, indicating the Serial Port and the ALT ZERO button, along with operational notes.

3. Setup

3.1 Battery Installation

The SPI PRO3600 is battery powered. To install or replace batteries:

Locate the battery compartment cover, typically on the underside or side of the unit.
Open the cover using a small screwdriver or coin if necessary.
Insert the required batteries (refer to the battery type indicated inside the compartment, usually AAA or button cell) ensuring correct polarity (+/-).
Close the battery compartment cover securely.

3.2 Initial Power On

After battery installation, press the ON/OFF button to power on the device. The LCD display should illuminate and show a reading.

4. Operating Instructions

4.1 Power On/Off

To turn the unit ON, press the ON/OFF button.
To turn the unit OFF, press the ON/OFF button again.
The unit will automatically shut off after 6 minutes of non-use to conserve battery life.

4.2 Zeroing (ALT ZERO)

The floating zero feature allows you to set a reference point anywhere within the 360° range.

Place the unit on your chosen reference surface.
Wait approximately 5 seconds for the reading to stabilize.
Press the ALT ZERO button. The display will reset to 0.0°, establishing this as your new reference.
To return to the original absolute reference (factory zero), press the ALT ZERO button again.

4.3 Holding a Reading

To freeze the current reading on the display:

Press the HOLD button. The displayed reading will be frozen.
To unfreeze the display and resume live readings, press the HOLD button again.

4.4 SPC Output

The PRO3600 features an SPC (Statistical Process Control) output port. This allows for data transfer to external devices for analysis. Refer to the manual for your specific SPC data collection system for connection and usage instructions.

4.5 Measuring Angles

Place the base of the protractor firmly on the surface you wish to measure. The digital display will show the angle relative to the last set zero point. For absolute measurements, ensure the unit is zeroed on a true horizontal surface.

SPI PRO3600 Digital Protractor displaying an angle of 1.24 degrees — Figure 4.1: The protractor displaying an angle measurement.

4.6 Using the V-Groove

The top plate of the protractor features a V-groove. This design allows for accurate registration and measurement on curved or cylindrical surfaces, such as pipes or shafts. Simply align the V-groove with the cylindrical object to obtain a stable and accurate reading.

5. Maintenance

5.1 Cleaning

Wipe the unit with a soft, dry cloth.
For stubborn dirt, a slightly damp cloth with mild soap can be used, followed by immediate drying.
Do not use abrasive cleaners, solvents, or immerse the unit in water.

5.2 Storage

Store the protractor in its supplied plastic case when not in use to protect it from dust, dirt, and physical damage.
Store in a dry environment, away from extreme temperatures and direct sunlight.
If storing for extended periods, remove the batteries to prevent leakage.

6. Troubleshooting

Unit does not power on: Check battery installation and ensure batteries are not depleted. Replace if necessary.
Inaccurate readings: Ensure the measurement surface is clean and stable. Perform an ALT ZERO calibration on a known true reference surface.
Unit shuts off unexpectedly: The unit has an automatic shut-off feature after 6 minutes of non-use. This is normal operation. If it shuts off during active use, check battery levels.
Display is dim or flickering: Batteries may be low. Replace them.

7. Specifications

Attribute	Value
Manufacturer	MSC Industrial
Part Number	03883782
Item Weight	6.5 pounds
Product Dimensions	6 x 1.2 x 2.3 inches
Item Model Number	31-040-9
Size	One Size
Color	Black
Material	Composite
Power Source	Battery Powered
Item Package Quantity	1
Included Components	Fitted Case

8. Warranty and Support

8.1 Warranty Information

SPI measuring instruments are backed by an industry-leading 2-Year warranty, ensuring their durability, precision, and reliability. Please retain your proof of purchase for warranty claims.

8.2 Customer Support

For technical assistance, warranty service, or inquiries regarding your SPI PRO3600 Digital Protractor, please contact SPI customer support through their official website or the retailer from whom you purchased the product.

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SPI 31-040-9