Dwyer SBLT2 - Manual

Series SBLT2 Submersible Level Transducer
Specifications - Installation and Operating Instructions
Bulletin L-28
The SBLT2 Submersible Level Transducer is manufactured for
years of trouble free service. The transmitter consists of a
piezoresistive sensing element, encased in a 316 SS housing.
Superior lightning and surge protection utilizing dual arrestor
technology, grounded to case, eliminating both power supply surges
and lightning ground strike transients (surge protection is not
guaranteed and is not covered by warranty). Bullet nose design
protects diaphragm from damage. Comes equipped with a 270-
pound tensile strength, shielded, vented cable. Ventilation tube in
the cable automatically compensates for changes in atmospheric
pressure above the tank.
APPLICATIONS
• Well monitoring; Ground water monitoring; Environmental remediation;
Surface water monitoring; Down hole; Water Tanks.
ELECTRICAL INSTALLATION
An external power supply delivering 13-30 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 – 13V
0.02A
Shielded cable is recommended for control loop wiring.
SPECIFICATIONS
Service: Compatible liquids.
Wetted Materials: 316 SS, 316L SS, epoxy adhesive; Cable: Polyether
polyurethane or ETFE; Bullet Nose: PVC.
Accuracy: ±0.25% of full scale.
Temperature Limit: 0 to 150°F (-18 to 66°C).
Compensated Temperature Range: 0 to 140°F (-18 to 60°C).
Thermal Effect: Less than ±0.02%/°F.
Pressure Limit: 2X full scale.
Power Requirement: 13 to 30 VDC.
Output Signal: 4 to 20 mA DC, 2-wire.
Response Time: 50 ms.
Max. Loop Resistance: 850 ohms at 30 VDC.
Electrical Connections: Wire pigtail.
Mounting Orientation: Suspended in tank below level being
measured.
Weight: 2.2 lb (1.0 kg).
Electrical Protection: Lightning and surge protection.
©Copyright 2013 Dwyer Instruments, Inc. Printed in U.S.A. 12/13 FR# M2-443430-50 Rev. 3
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]
6-45/64
(170.26)
Ш1
(Ш25.40)
1/2 NPT
SUBMERSIBLE
CABLE
BREATHER
TUBE
Example
Construction
Range
Cable Length
Options
SBLT
SBLT2 20
XXX
40
XXX
ETFE
SBLT2-20-40
Bullet style submersible level
transmitter, Polyurethane cable
In psi (5000 psi maximum)
In feet (1500 feet maximum)
ETFE cable
Model Number Guide
PRESSURE
TRANSDUCER
RED
BLACK
SHIELD
RECEIVER
mA
POWER
SUPPLY
13-30 VDC
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.