Dwyer SBLTX User Manual

Series SBLTX Submersible Level Transducer

Specifications - Installation and Operating Instructions

6-15/16

Ø1

[Ø25.40]

[176.21]

BREATHER TUBE

1/2 NPT

Bulletin L-37

SUBMERSIBLE
CABLE

The SBLTX Submersible Level Transducer is manufac­tured for years of trouble free service. The transducer con­sists of a piezoresistive sensing element, encased in a 316
SS housing. 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.

Intrinsic Safety Approval Classification

The SBLTX is UL listed for use in Hazardous (Classified) Loca­tions. The protection method is by Intrinsic Safety, “ia”. It was in­vestigated by UL under UL Standard 913 Sixth Edition and CSA
Standard No. 157-92.

For use in Hazardous (Classified) Locations:
Class I Div. 1 Groups A,B,C,D
Class II Div. 1 Groups E,F,G
Class III Div. 1
Temperature Code: T4 @ 80°C ambient
Install in accordance with control drawing 01-700797-00.

WARNING: To prevent ignition of flammable
or combustible atmospheres, disconnect
power before servicing.
Use with approved safety barriers using entity
evaluation.

Entity Parameters

Vmax

28VDC

Imax

93mA

Ci

0.051_F

Li

240_H

Pi

0.651W

SPECIFICATIONS
Service: Compatible liquids.
Wetted Materials: 316 SS, 316L SS, Buna-N; Cable:

Polyurethane or ETFE; Bullet Nose: PVC.

Accuracy: ±0.25% of full scale.
Temperature Limit: 0 to 176°F (-18 to 80°C).
Compensated Temperature Range: 0 to 176°F (-18 to 80°C).
Thermal Effect: Less than ±0.02% full scale/ °F.
Pressure Limit: 2X full scale.
Power Requirement: 10 to 28 VDC.
Output Signal: 4 to 20 mA DC, 2-wire.
Response Time: 50 ms.
Max. Loop Resistance: 900 ohms.
Electrical Connections: Wire pigtail.
Mounting Orientation: Suspended in tank below level being

measured.

Weight: 2.2 lb (1.0 kg).
Agency Approvals: CE, UL Intrinsically Safe to UL Standard

913. (See Intrinsic Safety Approval Classification.)

The following standards were used for CE approval:

IEC 61000-4-2: 2001
IEC 61000-4-3: 2006
IEC 61000-4-4: 2004
IEC 61000-4-5: 2005
IEC 61000-4-6: 2006
IEC 61000-4-8: 2001
CENELEC EN 55011: 2003
CENELEC EN 61326: 2003
89/336/EEC EMC Directive

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]

CAUTION: Do not exceed specified supply

POWER
SUPPLY
10-28 VDC

-

RECEIVER

BLACK

RED

PRESSURE

TRANSDUCER

mA

voltage ratings. Permanent damage not cov­ered by warranty will result. This device is not
designed for 120 or 240 volt AC operation.
Use only on 10 to 28 VDC.

INSTALLATION

1. Location: Select a location where the temperature of the trans-

ducer will be between 0 and 176°F (-18 to 80°C). Distance from
the receiver is limited only by total loop resistance.

2. Position: The transducer is not position sensitive. However all
standard models are originally calibrated with the unit in a position
with the pressure connection downward. Although they can be
used at other an gles, for best accuracy it is recommended that
units be installed in the position calibrated at the factory.

3. Mounting: The transducer can be mounted via several meth­ods. It can be suspended from the electrical cable, it can be
placed resting on the bottom of the tank in either horizontal or ver­tical orientation, or it can be attached to a pipe or hang wire by the
1/2˝ NPT male connection on the top of the housing.

4. Electrical Connections
Wire Length - The maximum length of wire connecting the trans-

ducer and receiver is a function of wire size and receiver resist­ance. Wiring should not contribute more than 10% of the receiver
resistance to total loop resistance. For extremely long runs (over
1000 feet), choose receivers with higher resistance to minimize
the size and cost of connecting leads. Where wiring length is
under 100 feet, wire as small as 22 AWG can be used.

5. Wiring

An external power supply delivering 10-28 VDC with minimum
current capability of 40 mA DC (per transducer) is required to
power the control loop. See Fig. A for connection of the power
supply, transducer and receiver. The range of appropriate receiver
load resistance (RL) for the DC power supply voltage available is
expressed by the formula:

RL Max = Vps – 10V

20 mA DC

Shielded cable is recommended for control loop wiring.

Fig. A

Black wire is negative (-) and red wire is positive (+).

Fig. B

MAINTENANCE

After final installation of the pressure transducer and its compan­ion receiver, no routine maintenance is required. A periodic check
of system calibration is suggested. The Series SBLTX transducer
are not field repairable and should be returned if repair is needed
(field repair should not be attempted and may void warranty). Be
sure to include a brief description of the problem plus any relevant
application notes. Contact customer service to receive a return
goods authorization number before shipping.