HARRISBURG — The Board of Governors of the State System of Higher Education Thursday approved a new three-year agreement with its campus police and security officers that includes a one-year freeze on all salaries and wages, the suspension of some overtime payments and temporary elimination of shift differential for officers who work second and third shifts.

The announcement came in a news release from the state system Thursday afternoon.

The state system includes Slippery Rock University, which has 20 police and security officers.

The new agreement with the Security, Police, Fire Professionals of America, which represents about 250 first-line supervisors and rank-and-file officers at the 14 state system universities, also calls for the creation of separate labor-management committees to develop a new police specific performance evaluation form, new officer training recommendations and recommendations on ways the universities could share police services. The probationary period for newly hired officers will be extended from six months to a year.

The agreement is retroactive to Sept. 1, 2011, and runs through Aug. 31, 2014. There are no general pay increases included, although officers will be eligible to receive wage increments of 2.25 percent each July. Shift differential will be eliminated in the first year of the contract. It will be restored to 25 cents an hour in November and to $1 an hour in November 2013.