Voltage to temperature

Rabbit
1

Hi
I have a temperature sensor (from http://www.phidgets.com/products.php?product_id=1114) connecting to analog input on my BL2600 I am able to see the voltage, now I am trying to convert the voltage to temperature with this equation,

adc0value = (((anaInVolts(0,2)*4.88)-200)/4);

But I get -49 deg C.
I can’t figure the problem pleas help

Thanks
Frank