Dwyer FBLT - Manual

The Series FBLT Submersible Level Transmitter is designed with a
flush diaphragm tip that will not clog in harsh applications such as
sewage lift stations. Narrow body design allows the FBLT to fit into
stilling wells and narrow installations. The FBLT features a robust FKM
fluoroelastomer diaphragm that is PTFE coated for a stick resistant
surface that will hold up in aggressive fluids. The diaphragm cavity is
filled with a gel that will not leak out versus oil or grease that our
competitors use. Body is constructed of 316 SS and the cable is either
polyurethane or ETFE for more corrosive applications.
The unit measures the height of liquid above the position that it is
mounted in a tank or pit in reference to atmospheric pressure. Ventilation
tube in the cable automatically compensates for changes in atmospheric
pressure above the fluid. The vent is protected with a maintenance free
filter, eliminating particulate or water droplets from entering the
transmitter. For extra protection against humidity, we offer the A-297
desiccant filter that can be attached to the vent tube.
The FBLT incorporates lighting and surge protection (not guaranteed or
covered by warrantee) to stand up in harsh applications. Optional NPT
connection allows the unit to be rigidly installed in a pipe/conduit, or to
attach our A-625 hanging loop for attaching a chain for pulling out of the
installation.
Applications
Sewage lift stations, industrial slurries, industrial sumps, landfill leachate,
reservoirs, sludge pits, oil tanks, etc.
ELECTRICAL INSTALLATION
An external power supply delivering 10 to 33 VDC with minimum current
capability of 40 mA DC (per transmitter) is required to power the control
loop. See figure below for connection of the power supply, transmitter
and receiver.
The maximum receiver load resistance (RLmax) for the DC power supply
voltage (Vsup) is expressed by the formula:
RLmax = Vsup – 10V
0.02A
Shielded cable is recommended for control loop wiring.
Series FBLT Submersible Level Transmitter
Specifications - Installation and Operating Instructions
Bulletin L-FBLT
SPECIFICATIONS
Service: Compatible liquids.
Wetted Materials:
Body: 316 SS;
Cable: Polyether polyurethane or ETFE;
Diaphragm: PTFE coated FKM fluoroelastomer;
Label: Polyethylene polyamid.
Accuracy: ±0.25% FS (absolute).
Temperature Limits: -4 to 176°F (-20 to 80°C).
Compensated Temperature Limits: 32 to 140°F (0 to 60°C).
Thermal Effect: ±0.0075%/°F (±0.0135%/°C).
Pressure Limit: 2x range.
Power Requirements: 10 to 33 VDC.
Output Signal: 4 to 20 mA DC 2-wire.
Response Time: < 50 ms.
Max Loop Resistance: 1000 Ω @ 30 VDC.
Electrical Connections: Wire pigtail.
Mounting Connection: Suspended below point being monitored.
Electrical Protection: Surge/lightning protected per EN61000-4-5,
Class 5.
Weight:
Body: 0.3 lb (0.136 kg);
Cable: 0.037 lb (0.009 kg) per foot.
Agency Approval: CE.
MERCOID DIVISION
DWYER INSTRUMENTS, INC.
P.O. BOX 258 • MICHIGAN CITY, IN 46360 U.S.A.
Phone: 219/879-8000 www.dwyer-inst.com
Fax: 219/872-9057 e-mail: [email protected]
BREATHER TUBE
SUBMERSIBLE CABLE
Ш1-3/16
[Ш30.16]
5-15/16
[150.83]
Ш5/8
[Ш15.87]
RECEIVER
PRESSURE
TRANSMITTER
RED
BLACK
SHIELD
POWER
SUPPLY
10-33 VDC
FBLT
FBLT with NPT Option
SUBMERSIBLE
CABLE
BREATHER TUBE
Ш1-3/16
[Ш30.16]
5-15/16
[150.83]
1-7/8
[47.63]
1/2˝ NPT
1/2
[12.69]
15/16 HEX
Ш5/8
[Ш15.87] 1-1/8
[29.33]
FBLT with NPT Option