Dynamic SFC332L, Operator'S Manual

Page: 40 / 148

Dynamic Flow Computers SFC332L Manual Quick Start
— 1-35
Date: 8/1/2019
Multi-Variable Transmitters (Model 205)
–RTD
RTD Calibration is a 2-step process. The first step is a onetime procedure to verify transducer
linearity and is done at the time the meter is being setup. The second step is the routine calibration
sequence.
Step 1
– Linearity Verification
1. Use a Decade box with 0-150 °F settings.
2. Connect RTD cable to this resistive element for verification of linearity. Verify low and high
points. It must be within ½ degree.
3. Connect the actual RTD element and compare with a certified thermometer.
4. If not within ½ degree do a Full Calibration (See Full Calibration below). If problem persists
verify other elements such as RTD Probe, connections, shield, conductivity of connectors, etc.
The purpose of the above procedure is to verify zero and span and make sure that the two points
fall within the expected tolerance.
Step 2
– Routine Calibration
Once Linearity has been verified through Step 1, the routine calibration procedure is reduced to
simply connecting the actual RTD and doing an offset point calibration (see offset calibration
below).
Calibration after that will be simple verification for the stability of the transmitter. If it drifts abnormally
then you need to verify the other parts involved.
Calibration Procedures
through Windows™ Software
At the top menu, go to Calibration and Select RTD Input.
RESET TO DEFAULT CALIBRATION
1. Select Reset calibration method
2.
Now verify the live reading against the flow computer reading
OFFSET CALIBRATION:
1. Select offset calibration method.
2. Induce a live value and wait for 10 seconds for the reading to stabilize. Then enter the live
value. The value entered must be in Degrees only.
3.
Now verify the live reading against the flow computer reading
FULL SCALE CALIBRATION:
1. Prepare low range resistive input (i.e., 80 Ohm.) and High range resistive input (i.e., 120.
Ohm).
2. Go to the calibration menu and select RTD full calibration method. Induce the low end (80
Ohm.) resistive signal and then wait 10 seconds, enter the equivalent temperature in degrees,
and click OK button.
3. Induce the High range signal (120 Ohm.) and wait 10 seconds, then enter the temperature
degrees equivalent to 120 Ohm and click OK button.
4.
Now verify the live reading against the flow computer reading .