Xylem WE100 BAROMETRIC PRESSURE TRANSMITTER - Manual (Page 16)

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XIV.
Appendix A: Temperature Calibration check
Step 1) Fill a container of water with enough ice that it will not melt
quickly.
Step 2) Place the temperature sensor and thermometer into the
container. Turn on the power supply and the current meter.
Let the sensor stabilize for 30 minutes before taking any
measurements.
Step 3) Record the ice bath temperature, I
T
= _______, and record the
output current of the sensor, I
C
= _______.
Step 4) Fill a container with enough warm water that it will not cool
down quickly.
Step 5) Place the temperature sensor and thermometer into the
container. Turn on the power supply and the current meter.
Let the sensor stabilize for 30 minutes before taking any
measurements.
Step 6) Record the warm water temperature, W
T
= _______, and
record the output current of the sensor, W
C
= _______.
Step 7) Subtract I
C
from W
C,
W
C
- I
C
= _______ = C.
Step 8) Subtract I
T
from W
T,
W
T
- I
T
= _______ = T.
Step 9) Calculate B. W
C
– (C/T)(W
T
)= _______ = B.
Step 10) Find the low current value for the sensor. –(C/T)(50)+B= _____
= L
C
. This current is the output current the sensor would
produce if the temperature were -50°C.
Step 11) Find the high current value for the sensor. (C/T)(50)+B= _____
= H
C
. This current is the output current the sensor would
produce if the temperature were 50°C.
Step 12) Use these new current values to recalibrate the system that is
monitoring the sensor output.