Dwyer MBLT User Manual

Bulletin L-MBLT

6-1/4

[158.30]

Ø5/8

[Ø15.87]

SUBMERSIBLE

CABLE

BREATHER

TUBE

RECEIVER

PRESSURE

TRANSMITTER

RED

BLACK

SHIELD

POWER
SUPPLY

10-33 VDC

Series MBLT Miniature Submersible Level Transmitter

Specifications - Installation and Operating Instructions

The MBLT Miniature Submersible Level Transmitter is only 0.63˝ in

diameter making it ideal for level monitoring in well and borehole appli­cations. Constructed for years of trouble free service, the MBLT has a
welded 316 SS body and 316 SS nose cap. Body top is also 316 SS and
tapered to prevent damage or snares when pulling the unit out of the
installation. Featured in the MBLT is a precision ±0.10% or ±0.25% of full
scale accuracy output, better than BFSL or BSL rated outputs used by
most competitors. Lightning and surge protection (not guaranteed or cov­ered by standard warranty) is included standard to stand up in harsh
applications. MBLT comes with a choice of polyether polyurethane or
ETFE cable materials and all are vented for barometric pressure com­pensation. Vent is covered with a maintenance-free filter preventing par­ticulate or water droplets from entering the transmitter.

APPLICATIONS

• Ballast tanks; Ground water monitoring; Surface water monitoring;
Dewatering;

Down hole; Remediation and other environmental monitoring applica-

tions.

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.

SPECIFICATIONS
Service: Compatible liquids.
Wetted Materials:

Body and nose: 316 SS;
Cable: Polyether polyurethane or ETFE;
Seals: Fluoroelastomer;
Label: Polyethylene polyamid.

Accuracy: ±0.25% or ±0.10% of FS.
Temperature Limits: -4 to 176°F (-20 to 80°C).
Compensated Temperature Limits: 0.25%: (0 to 70°C); 0.10%: (0 to

60°C).

Thermal Effect: 0.25%: ±0.45% FS TEB; 0.10%: ±0.30% FS TEB.
Pressure Limit: 2x FS.
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: 0.235 lb (0.107 kg);
Cable: 0.037 lb (0.009 kg) per foot.

Agency Approval: CE.

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 46361 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

MBLT

Example
Construction
Circuit
Options
Body
Material
Accuracy

Output
Reference
Cable
Material
Range Unit

Range Value
Cable
Length
Options

MBLT

22S

F

IIVVP

C

S

B
C

30X50XNIST

P
E

F
M
P

MBLT-2SC-IVPF-30-50-NIST

Narrow bullet
Surge protected

316 SS

0.10%

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

MAINTENANCE/REPAIR

Upon final installation of the Series MBLT, no routine maintenance is
required. The Series MBLT 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# M2-443891-00 Rev. 2

MERCOID DIVISION

DWYER INSTRUMENTS, INC.

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

P.O. BOX 258 • MICHIGAN CITY, IN 46361 U.S.A.