Orange - 1 hour limit
Green - 3 hour limit
Purple - 9 hour limit
Blue - disabled
Yellow - motorcycle
Most meters have been updated to new machines which have all the information for the user.
Source: https://www.launceston.tas.gov.au/Built-Environment-and-Parking/Parking/Fees
Map: http://launceston.maps.arcgis.com/apps/webappviewer/index.html?id=b93faf3a462347629ed5cd56d647e545