Omron HJ-321 User Manual

The Omron HJ-321 is a pocket-sized, advanced pedometer designed to accurately count your daily steps, calculate distance traveled, and estimate calories burned. It features a large, easy-to-read display, a secure clip for attachment, and a 7-day memory function. Powered by a single CR2032 battery, it is ideal for walking, jogging, and general fitness tracking. Below are key sections for safety, features, setup, operation, maintenance, and troubleshooting.

1. Features at a Glance 2. Getting Started 3. Setting Your Stride Length & Weight 4. Specifications 5. Daily Operation 6. Memory & Data Review 7. Battery Replacement 8. Care & Maintenance 9. Regulatory Information 10. Troubleshooting

Features at a Glance

Key components: Main unit with LCD display, Reset button, Battery compartment, Belt clip.

Feature	Description
Step Counter	Accurately counts steps using a precision 3D sensor.
Distance Calculator	Calculates distance walked/run based on your stride length.
Calorie Estimator	Estimates calories burned based on steps and your weight.
7-Day Memory	Stores daily step data for one week.
Large LCD Display	Shows steps, distance, calories, and memory data clearly.
Auto Reset	Automatically resets steps at midnight (12:00 AM).
Belt Clip	Secure clip for attaching to waistband, pocket, or bag.
Battery Indicator	Shows low battery warning on the display.
Reset Button	Manual button to reset the current day's data.
Battery Compartment	Houses the CR2032 battery; secured with a screw.

Getting Started

Unpack the pedometer and inspect contents. Ensure the battery insulator tab is removed.

Insert Battery: Open the battery compartment on the back, insert the CR2032 battery with the positive (+) side facing up, and secure the cover.
Attach the Pedometer: Clip the pedometer securely to your waistband, pocket, or the top of your shoe, ensuring it is vertical.
Initial Reset: Press and hold the RESET button for 2 seconds to clear any previous data.

WARNING! Keep the battery away from children. If swallowed, seek medical attention immediately.

Setting Your Stride Length & Weight

For accurate distance and calorie calculations, you must set your personal stride length and body weight.

Measure Stride Length: Walk 10 steps, measure the total distance in feet or meters, and divide by 10 to get your average stride length.
Enter Settings: With the pedometer off, press and hold the MODE button. Use the SET button to cycle to the stride length setting. Enter your value using the ADJUST buttons. Repeat for weight setting.
Save and Exit: Press MODE again to save and return to normal operation.

TIP: For best accuracy, measure your stride on a flat, measured surface.

Specifications

Model: Omron HJ-321.
Measurement: Steps, Distance (miles/km), Calories (kcal).
Sensor: Advanced 3D Tri-Axis Sensor.
Memory: 7-day memory storage.
Display: LCD with backlight (on some models).
Battery: 1 x CR2032 Lithium battery.
Battery Life: Approximately 6 months with typical use.
Operating Temp: 14°F to 104°F (-10°C to 40°C).
Dimensions: 2.0" x 1.6" x 0.6" (approx).
Weight: 0.8 oz (23g) (without battery).

Daily Operation

Wear the pedometer vertically on your waist or in your pocket. The display will show your current step count by default.

Viewing Data: Press the MODE button to cycle through displays: Steps -> Distance -> Calories -> Memory (past days).

Resetting Data: To manually reset the current day's step count, press and hold the RESET button for 2 seconds. The display will flash and reset to zero.

Auto-Reset: The pedometer automatically resets the step count at midnight. The previous day's data is saved to memory.

Memory & Data Review

The pedometer stores step data for the past 7 days (Day 1 = today, Day 2 = yesterday, etc.).

Enter Memory Mode: Press the MODE button until "MEMORY" or a day number appears.
Review Past Days: Use the ADJUST (▲/▼) buttons to scroll through the data for the last 7 days.
View Details: For each day, you can press MODE again to see the distance and calories for that day.
Exit: Press and hold MODE to return to the main step display.

Note: Memory data is not erased when the battery is replaced, but a full reset will clear it.

Battery Replacement

Replace the battery when the low battery icon appears on the display.

Turn the pedometer over and locate the battery compartment.
Use a small Phillips screwdriver to remove the screw and open the cover.
Remove the old CR2032 battery.
Insert a new CR2032 battery with the positive (+) side facing up.
Replace the cover and tighten the screw securely.
The pedometer will reset. You will need to re-enter your stride length and weight settings.

CAUTION! Use only a CR2032 battery. Do not use rechargeable batteries or other types.

Care & Maintenance

Unclip the pedometer before cleaning. Use a soft, dry cloth to wipe the casing and display. Do not use chemicals, solvents, or water.

Storage: Store in a cool, dry place away from direct sunlight and extreme temperatures.

CAUTION! Do not disassemble the unit beyond the battery compartment. Avoid impacts and dropping.

Regulatory Information

FCC Compliance: This device complies with Part 15 of the FCC Rules. Operation is subject to the condition that this device does not cause harmful interference. Copyright © Omron Healthcare, Inc. All rights reserved. For support, visit www.omronhealthcare.com or contact customer service at 1-800-634-4350.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Display is blank	Dead battery or battery installed incorrectly	Replace with a new CR2032 battery, ensuring correct polarity.
Inaccurate step count	Incorrect wearing position or stride length setting	Wear vertically on waistband. Re-measure and set your stride length accurately.
Pedometer does not count steps	Sensor may be obstructed or unit is not moving	Ensure it is clipped securely and you are walking normally. Reset the unit.
Memory data is incorrect or missing	Battery was removed or unit was fully reset	Memory is cleared on a full reset. Replace battery promptly to avoid data loss.
Low battery icon displayed	Battery is depleted	Replace the CR2032 battery as soon as possible.
Button does not respond	Battery is too low or unit is locked	Replace battery. Ensure you are pressing the correct button sequence.

Reset to Factory Defaults: Remove battery, wait 1 minute, reinsert battery. All settings and memory will be erased.

Service: For warranty service or technical support, contact Omron Healthcare at 1-800-634-4350 or www.omronhealthcare.com.