Dwyer PBLTX User Manual

Series PBLTX Submersible Level Transducer

60˚

TYP

ø1/4 x THRU

[ø6.35 x THRU]

ø3-7/16

[ø87.31]

ø1/4 [ø6.35] x THRU

ON A ø1-39/64 [ø40.88] B.C.

8

-3/32

[205.58]

2

-3/16

[55.56]

BREATHER TUBE

ø1 [25.40]

1/2 NPT

SUBMERSIBLE
CABLE

Specifications - Installation and Operating Instructions

Bulletin L-23

The PBLTX Submersible Level Transducer is manufactured

for years of trouble free service in the harshest applications. The
PBLTX measures the height of liquid above its position in the
tank referenced to atmospheric pressure. The transducer con­sists of a piezoresistive sensing element, encased in a 316 SS
housing. Perfect for wastewater and slurry applications with fea­tures to protect the unit from these demanding applications.
Large diameter 316 SS diaphragm seal is non-clogging and
damage resistant to floating solids.

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.
The vent is protected with a maintenance free filter eliminating
particulate or water droplets from entering the transducer.

Intrinsic Safety Approval Classification

The PBLTX 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.

SPECIFICATIONS
Service: Compatible liquids.
Wetted Materials: 316 SS, 316L SS, epoxy adhesive; Cable:

Polyether polyurethane or ETFE.

Accuracy: ±0.25% full scale.
Temperature Limit: 0 to 176ºF (-18 to 80ºC).
Compensated Temperature Range: 0 to 176ºF (-18 to 80ºC).
Thermal Effect: Less than ±.02%/ FS/ºF.
Pressure Limit: 2X full scale.
Power Requirement: 10-28 VDC.
Output Signal: 4 to 20 mA DC, two wire.
Response Time: 50 msec.
Max. Loop Resistance: 900 ohms.
Electrical Connection: Wire pigtail.
Mounting Orientation: Suspended in tank below level being

measured. Can be placed on the bottom of the tank on its side.

Weight: 4.3 lb (2.0 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

Entity Parameters

Li

240_H

0.651W

Vmax

28VDC

MERCOID DIVISION

DWYER INSTRUMENTS, INC.

Imax

93mA

0.051_F

Ci

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

Pi

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

R

ED

PRESSURE

TRANSDUCER

mA

B

LACK (-)

RED (+)

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.

NSTALLATION

I

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.

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:

L Max =Vps – 10V

R

20 mA DC

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

nstalled in the position calibrated at the factory.

i

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. Wire Length: The maximum length of wire connecting the
transducer 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.

Shielded cable is recommended for control loop wiring.

Fig. A

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

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 PBLTX transduc­ers 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.