Tds on reimbursement of expenses by employer

Hi All, Have a question with regard to TDS U/s 192. When an employee is sent on deputation by the employer to another location with India, and the employee incurs cost on travel and conveyance, and the expenses are reimbursed by employer, is TDS deductible u/s 192 ? Also the employer pays per-diem to the employee, how is this treated ? p.s : The above reimbursements are made separately from the salary payment. Please Advice.