Mercoid FBLT Operating Manual

B

REATHER TUBE

SUBMERSIBLE CABLE

Ø

1-3/16

[

Ø30.16]

5-15/16

[150.83]

Ø

5/8

[

Ø15.87]

RECEIVER

PRESSURE

TRANSMITTER

RED

BLACK

SHIELD

POWER
SUPPLY

10-33 VDC

FBLT

S

UBMERSIBLE

C

ABLE

B

REATHER TUBE

Ø

1-3/16

[

Ø30.16]

5

-15/16

[

150.83]
1

-7/8

[

47.63]

1/2˝ NPT

1

/2

[

12.69]
1

5/16 HEX

Ø5/8

[Ø15.87]

1-1/8

[29.33]

Bulletin L-FBLT

Series FBLT Submersible Level Transmitter

Specifications - Installation and Operating Instructions

FBLT with NPT Option

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.

FBLT with NPT Option

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.

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.

MERCOID DIVISION

DWYER INSTRUMENTS, INC.
P.O. BOX 258 • MICHIGAN CITY, IN 46360 U.S.A.

Phone: [phone] www.dwyer-inst.com
Fax: [phone] e-mail: [e-mail]

WARNING:

A voltage potential between the ground wire of the unit and the ground
of other equipment can lead to electrolytic corrosion. Always ensure the
grounding system provides an equipotential between the transmitter and
the earthing ground connection. Avoid using the power system protective
ground since this will often have a significant potential difference to the
transmitter ground. Also note that dissimiliar metals in the ground system
may cause electrolysis corrosion of the transmitter or other components
in the ground system.

During installation, connect a voltmeter or ammeter between the shield
ground wire and the grounding connection. If there is a measurable
voltage or current electrolytic corrosion may be a serious possibility. If
there is a potential difference then some isolation system will be
required. Improper grounding may lead to damage or poor signal
integrity.

Model Number Guide

22S

Example
Construction
Circuit
Options
Body
Material
Accuracy
Output
Reference
Cable
Material
Range Unit

Range Value
Cable
Length
Options

Note: With NPT option only, tighten connection with wrench on top 15/16 hex, not

the nut.

FBLT

FBLT

C

S

C

IIVVP

F

P
E

F
M
P

30X50XNIST

FBLT-2SC-IVPF-30-50-NIST

Flush Tip
Surge protected

316 SS

0.25%
4 to 20 mA
Vented
Polyether polyurethane
ETFE
Feet of water column
Meter of water column
PSI

In feet for feet and psi range,
in meters for meter range
NIST Traceable Certificate

NIST

1/2˝ NPT mounting option

NPT

MAINTENANCE/REPAIR

Upon final installation of the Series FBLT, no routine maintenance is
required. The Series FBLT is not field serviceable and should be returned
if repair is needed (field repair should not be attempted and may void
warranty).

WARRANTY/RETURN

Refer to “Terms and Conditions of Sales” in our catalog and on our
website. Contact customer service to receive a Return Goods
Authorization number before shipping the product back for repair. Be
sure to include a brief description of the problem plus any additional
application notes.

©Copyright 2013 Dwyer Instruments, Inc. Printed in U.S.A.12/13 FR# M2-443891-10 Rev.1

MERCOID DIVISION

DWYER INSTRUMENTS, INC.

Phone: [phone] www.dwyer-inst.com
Fax: [phone] e-mail: [e-mail]

P.O. BOX 258 • MICHIGAN CITY, IN 46360 U.S.A.