In counties of less than 1 million population, the sheriff shall control the internal operations of his office. Subject to the applicable county appropriation ordinance, the sheriff shall direct the county treasurer to pay, and the treasurer shall pay, the expenditures for the sheriff's office, including payments for personal services, equipment, materials and contractual services. Purchases of equipment by the sheriff shall be made in accordance with any ordinance requirements for centralized purchasing through another county office or through the state which are applicable to all county offices.
55 ILCS 5/3-6018