Epson PS-500 Series User Manual page 23

If the heart rate can't be detected
The following vibration (if enabled) and display is shown when heart rate can't be detected.
PS-500's Screen
Note:
Try the below to facilitate heart rate detection.
- Try to keep your body and arms still.
- Position the arm below your heart. Do not cross your arms.
2
Once detection is complete, your heart rate will be displayed on the screen as shown below.
State
It is likely that the device is not
fitted correctly onto your wrist.
It is likely that the device is not
fitted correctly onto your wrist or
the temperature on the surface of
your skin is too low.
Support
Wear the product closely around
your wrist. Tighten the wrist band
if your pulse is not measured
correctly.
Wear the product closely around
your wrist. Tighten the wrist band
if your pulse is not measured
correctly and warm your wrist and
fingertips if they seem cold.
How to use  23