I went through the process this winter when I set up for indoor training. I asked Polar about it and they were actually very responsive. They sent a detailed email and included an attachment which shows the proper pin placement on the sensor to boost the power output. The text of the email follows. I'd be happy to forward the entire email with the attachment if you want to email me at
[email protected]
Dear Nick,
The Speed Sensor range can be adjusted by opening the cover and changing the
position of the plug inside. See the attached instructions.
Please check the following things first:
1.1 The sensor is working properly
The indicator light (LED) inside the sensor lights up when the magnet
passes the sensor.
This happens 50 times at the beginning of the ride, after which the light
turns off while the sensor continues operating.
1.2 Check that magnet, sensor and receiver are mounted as directed in the user's
manual.
The angle between the sensor and the receiver has an effect on the transmission
range and it should be as close to 90 degrees as possible.
In many bikes the wheel is so close to the fork that the optimal angle cannot be
achieved, however, an adequate range can be achieved by adjusting the range
setting in the sensor and the angle between the sensor and the receiver.
By way of a practical tip please turn the alarm sound off when you are in the
biking mode, in some circumstances the sound may give abnormal high-speed
readings.
2. Transmission range adjustment
If these basic settings are correct and the problem is not solved, the
transmission range can be adjusted. There are three possible settings for the
transmission range in the sensor: short, medium and long.
We strongly recommend that you send the sensor to an authorised Polar Service
Center, where the unit is tested for water resistance after adjustment. Water
resistance cannot be guaranteed after an unauthorised service.
If you wish to adjust the sensor by yourself, follow the attached instructions
carefully and note that the warranty does not cover damage or consequential
damage caused by service not carried out by an authorised service center of
Polar Electro.
(See attached file: TRANSMISSION RANGE ADJUSTMENT.doc)
If you would like to return your unit for service please return your sensor plus
$2.95 for return shipping and handling to:
Polar Electro Inc.
370 Crossways Park Drive
Woodbury, NY 11797
Attn: Technical Service
Please include your name, address and daytime phone number in the event we need
to contact you.
It is recommended you return your unit in a traceable manner such as UPS Ground
or Insured US Mail.