Garmin HRM-TRI Owner's Manual

• Warm up for 5 to 10 minutes.
• Follow the care instructions (

).

• Wear a cotton shirt or thoroughly wet both sides of the strap.

Synthetic fabrics that rub or flap against the heart rate 

monitor can create static electricity that interferes with heart 

rate signals.

• Move away from sources that can interfere with your heart 

rate monitor.
Sources of interference may include strong electromagnetic 

fields, some 2.4 GHz wireless sensors, high-voltage power 

lines, electric motors, ovens, microwave ovens, 2.4 GHz 

cordless phones, and wireless LAN access points.

If running dynamics data does not appear, you can try these 

tips.
• Make sure you have the HRM-Tri accessory.

Accessories with running dynamics have   on the front of the 

module.

• Make sure your Garmin device supports running dynamics.

For more information, go to 

• Pair the HRM-Tri accessory with your Garmin device again, 

according to the instructions.

• If the running dynamics data display shows only zeros, make 

sure the heart rate monitor is worn right-side up.
NOTE: Ground contact time appears only while running. It is 

not calculated while walking.

Remove the sleeve 

À

 from the heart rate monitor module.

Use a small Phillips (00) screwdriver to remove the four 

screws on the front of the module.

Remove the cover and battery.

Wait 30 seconds.

Insert the new battery under the two plastic tabs 

Á

 with the 

positive side facing up.
NOTE: Do not damage or lose the O-ring gasket.
The O-ring gasket should remain around the outside of the 

raised plastic ring.

Replace the front cover and the four screws.
Observe the orientation of the front cover. The raised screw 

Â

 should fit in the matching raised screw hole on the front 

cover.
NOTE: Do not overtighten.

Replace the sleeve.

After you replace the heart rate monitor battery, you may need 

to pair it with the device again.

A buildup of sweat and salt on the strap can decrease the ability 

of the heart rate monitor to report accurate data.

• Rinse the heart rate monitor after every use.
• Hand wash the heart rate monitor after every seven uses or 

one pool swim, using a tiny amount of mild detergent, such 

as dishwashing liquid.
NOTE: Using too much detergent may damage the heart rate 

monitor.

• Do not put the heart rate monitor in a washing machine or 

dryer.

• When drying the heart rate monitor, hang it up or lay it flat.

ANT+ technology links your heart rate monitor to fitness 

equipment so you can view your heart rate on the equipment 

console.
• Look for the ANT+LINK HERE logo on compatible fitness 

equipment.

• Go to 

 for more linking instructions.

Battery type

User-replaceable CR2032, 3 V

Battery life

Up to 10 mo. for triathlon training 
(approximately 1 hr./day)

Operating temperature 
range

From -10° to 50°C (from 14° to 122°F)

Radio frequency/protocol 2.4 GHz ANT+ wireless communications 

protocol

Water rating

5 ATM*

*The device withstands pressure equivalent to a depth of 50 m. 

.

The Garmin standard limited warranty applies to this accessory. 

Installation Instructions

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