Vaisala PTU200 - Manual (Page 44)

U SER ' S G UIDE _______________________________________________________________________
40 ___________________________________________________________________ M210195 EN -A
Example: T
ref
= 23.15°C
T
meas
= 23.28°C
Offset = -0.13°C
Gain
The gain correction can be calculated with the equation 6-2. It is
reasonable to use the low (T
1
) and the high (T
2
) end of needed
temperature range.
( ) ( )
2 1
2 2 1 1 1
meas meas
meas ref meas ref
T T
T T T T
Gain
−
− − −
+ = (6-2)
where:
T
ref1
= measured with a reference thermometer at temperature T
1
T
ref2
= measured with a reference thermometer at temperature T
2
T
meas1
= measured with PTU200 at temperature T
1
T
meas2
= measured with PTU200 at temperature T
2
Example:
T
ref1
= -14.97°C and T
meas1
= -14.90°C
T
ref2
= +30.12°C and T
meas2
=+30.29°C
Gain = 0.99779
Offset = T
ref2
-Gain*T
meas2
= -0.10
T = 0.99779 * 30.29°C - 0.10 = 30.12°C
TXCI Entering corrections for HMP45D and PT100
temperature measurement
TXCI x
where:
x = 2 if there is one pressure transducer installed
3 if there is two pressure transducers installed
The TXCI command is used to enter new offset and offset/gain
corrections for temperature measurement of HMP45D and PT100.