I have set the Correct Channel in both the SS200LR and the PV:1525 but the units are not pairing

If following the instructions in the manual have not worked, there is one more thing you can try with the SS:200LR

The unit has an inbuilt ID setting that should be set to 1 when manufactured. 

If this is set to 2 then communication between the devices will not be possible.

To check and correct the ID follow the instructions below

With the device turned on, press and hold the Angle and HOLD buttons for one second.

The display should show Id and a number either (1 or 2).

If set to 2 correct this by pressing the Arrow down button (Clock) until the unit displays 1, then press Ok

Turn both units off then back on and connectivity should be established.

If this does not work, please contact our support team for further help.