Dwyer SF - Manual (Page 2)

©Copyright 1998 Dwyer Instruments, Inc. Printed in U.S.A. 3/98
3. Remove the access cover with pliers, taking care not to
damage the o-ring seal.
4. Pull out turbine assembly and shaft.
5. Inspect the shaft for things that may have wrapped
around it.
6. Inspect the turbine bearing surface for wear and elonga-
tion. replace as necessary.
7. Clean any rust off of the magnets that may have accu-
mulated.
8. Reassemble the unit by placing the turbine into the body
cavity with the two magnet pockets facing inward. Place
the shaft into the turbine hole and guide it into the retaining
hole in the body cavity. Lubricate the o-ring with glycerine
or other lubricant and press it into the pocket of the body.
Replace the retaining ring securely before applying pres-
sure to the system.
Circuit Recalibration:
1. Place a milliamp meter into the current loop.
2. Turn off the flow going through the sensor. Adjust the
OFFSET control for a reading of 4mA on the milliamp meter.
3. Adjust the flow rate through the sensor to full flow rate.
Adjust the SPAN control for a reading of 20mA on the mil-
liamp meter. The zero and span adjustment are not interac-
tive and should require additional adjustments.
FR R1-443038-00
4. Apply power to the system.
5.If everything ois operating correctly, the green LED on the
sensor will dimly illuminate and 4mA will be flowing in the
loop. If fluid is flowing through the sensor, the current will
be higher than 4mA.
Troubleshooting
If the LED does not illuminate:
• Check wiring terminations for good connections.
• Check wiring polarity.
• Verify correct supply voltage.
• Insure the load impedance is within allowable
limits.
• Apply the DC supply voltage directly across the
sensor wires. If the LED does illuminate, the load is
either: too great of impedance or an open circuit. If
the LED does not illuminate, the sensor’s lead
wires or circuit are defective.
SERVICE and MAINTENANCE
The Series SF Flow Transmitter is designed to provide
years of low maintenance service in industrial environ-
ments. As with all mechanical rotating devices, the bearing
surfaces will wear with use. The life of the parts will depend
on factors such as cleanliness of fluid, media, mounting
orientation, temperature, fluid velocity and frquency of
operation. The sensor was designed with simple field-
replacement of the rotating parts.
To inspect or replace the rotating components:
1. Relieve pressure in the piping system.
2. Remove the retainer ring that secures the turbine access
cover.
DWYER INSTRUMENTS, INC.
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46361 U.S.A.
Phone: 219/879-8000 www.dwyer-inst.com
Fax: 219/982-9057 e-mail: [email protected]
Lit-by-Fax: 888/891-4963