FastFlo™ 620S Instruction Manual
Chapter 3 Operation
IM-62S
3-13
4. Set the multimeter to read Ohms in the 2K range. Connect the mul-
timeter to terminals J5 and J6 (temperature sensor). Measure the
resistance between J5 and J6 and record the temperature sensor re-
sistance (in Ohms) in Table 3-2.
5. Set the multimeter to read in the 200 Ohm range. Connect the multi-
meter to terminals J7 and J8 (velocity sensor). Measure the resistance
between J7 and J8 and record the velocity sensor resistance (in
Ohms) in Table 3-2.
6. Use the measured resistance values and the Ro and Alpha values
from the Calibration Certificate to calculate the temperature for each
sensor as follows:
T = R – R
Alpha x R
T = degrees Celsius
R = measured sensor resistance
R = resistance at 0° C (f rom the Calibration Certif icate)
Alpha = v alue unique to each sensor (f rom the Calibration Certif icate)
o
o
Where
o
7. Compare the results recorded in Table 3-2. The sensors are validat-
ed if they are within 10 degrees Celsius of each other.
8.
Disconnect the multimeter and replace the four-position jumper on the
sensor terminals.
Make sure the jumper is securely in place before
applying power.
Replace cover
.
Temperature Sensor
Resistance
T
(from equation)
Velocity Sensor
Resistance
T
(from equation)
Table 3-2. Sensor Validation Results
