Supply voltrage for K6001

Instruction for the K6001 temperature sensor step 13. “Adjustment an use” states : Connect 12VDC to points +VS and -VS, but the instructions for the K6002 unit, step 5.0 where both units are shown together in their necessary connection, the sensor unit is shown to be supplied by 9V.
Which voltage is correct? 12 volt or 9 volt ?
Bo G

9-12VDC is OK for the sensor.
Please note that the K6002 requires 9VAC