Dynamic SFC332L, Operator'S Manual

Page: 42 / 148

Dynamic Flow Computers SFC332L Manual Quick Start
— 1-37
Date: 8/1/2019
RTD calibration:
For offset calibration simply go to
I/O | Calibration
and press < ENTER> . Once the flow computer
shows communication status OK press <F8> and scroll to
RTD 1
or
RTD 2
. 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.
RESET TO DEFAULT CALIBRATION
To go back to the default calibration simply press <F8> and scroll to the RTD input, and press
<ALT> <R> key followed by <F3> function key.
OFFSET CALIBRATION:
For offset calibration simply go to
I/O | Calibration
and press < ENTER>. Once the flow
computer shows communication status OK press <F8> function key and scroll to
RTD.
Induce a
live value and wait for 10 seconds for the reading to stabilize. Then enter the live value followed
by <F3> function key to download the direct reading. The value entered must be in ohms only.
FULL SCALE CALIBRATION:
1. Prepare low range resistive input (i.e., 80

) and High range resistive input (i.e., 120

). Go to
the calibration menu and press <F8> function key. Scroll to the RTD input you are calibrating
and press <ALT> <R> (key <ALT> and the letter R at the same time). Induce the low end
(80

) resistive signal and then wait 10 seconds and enter 80 followed by pressing the <F3>
function key.
2. Induce higher range signal (120

) and wait 10 seconds, then enter the number 120 ohm and
press the <F3> key.
3. Now verify the live reading against the flow computer reading .