open_valve()
counter = 0

while True:
    set_pol_cplus(offset = None)
    wait_temp()
    wait_beam()
    set_file('Se_plus')
    otf(start=1410, end=1510, time=3, delay=5)

    set_pol_cminus(offset = None)
    wait_temp()
    wait_beam()
    set_file('Se_minus')
    otf(start=1410, end=1510, time=3, delay=5)

    set_pol_cminus(offset = None)
    wait_temp()
    wait_beam()
    set_file('Se_minus')
    otf(start=1410, end=1510, time=3, delay=5)

    set_pol_cplus(offset = None)
    wait_temp()
    wait_beam()
    set_file('Se_plus')
    otf(start=1410, end=1510, time=3, delay=5)

    counter=counter+1

    if counter>5:
        break

close_valve()