Mercoid PBLTX Series Manuale utente
Series PBLTX Submersible Level Transducer
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 con-
sists of a piezoresistive sensing element, encased in a 316 SS
housing. Perfect for wastewater and slurry applications with fea-
tures 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 com-
pensates 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) Loca-
tions. The protection method is by Intrinsic Safety, “ia”. It was in-
vestigated 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 be-
fore servicing.
Use with approved safety barriers using entity
evaluation.
SPECIFICATIONS
Service: Compatible liquids.
Wetted Materials: 316 SS, 316L SS, Buna-N, cable: ETFE or
polyurethane.
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
MERCOID DIVISION
DWYER INSTRUMENTS, INC.
P.O. BOX 258 • MICHIGAN CITY, IN 46361 U.S.A.
Phone: 219/879-8000 www.dwyer-inst.com
Vmax
28VDC
Imax
93mA
Ci
0.051_F
Li
240_H
Entity Parameters
Pi
0.651W
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 SUBMERSIBL
CABLE
L23_test:Layout 1 12/7/09 8:48 AM Page 1
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 re-
ceiver load resistance (RL) for the DC power supply voltage avail-
able is expressed by the formula:
RL Max =Vps – 10V
20 mA DC
Shielded cable is recommended for control loop wiring.
Black wire is negative (-) and red wire is positive (+) in Fig. B.
MAINTENANCE
After final installation of the pressure transducer and its compan-
ion receiver, no routine maintenance is required. A periodic check
of system calibration is suggested. The Series PBLTX transduc-
ers are not field repairable and should be returned if repair is
needed (field repair should not be attempted and may void war-
ranty). Be sure to include a brief description of the problem plus
any relevant application notes. Contact customer service to re-
ceive a return goods authorization number before shipping.
CAUTION: Do not exceed specified supply
voltage ratings. Permanent damage not cov-
ered 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 posi-
tion with the diaphragm downward. Although they can be used at
other angles, 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 meth-
ods. 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 re-
sistance. Wiring should not contribute more than 10% of the re-
ceiver resistance to total loop resistance. For extremely long runs
(over 1000 feet), choose receivers with higher resistance to min-
imize the size and cost of connecting leads. Where wiring length
is under 100 feet, wire as small as 22 AWG can be used.
POWER
SUPPLY
10-28 VDC
-
RECEIVER
BLACK
RED
PRESSURE
TRANSDUCER mA
Fig. A
Fig. B
BLACK (-)
RED (+)
L23_test:Layout 1 12/7/09 8:48 AM Page 2
NOTES:
1. MAX SAFE AREA VOLTAGE NOT TO EXCEED 250 VAC.
2. NO REVISIONS WITHOUT PRIOR UNDERWRITERS LABORATORY APPROVAL.
3. (ENTITY CONCEPT DEFINITIONS)
THE ENTITY CONCEPT ALLOWS INTERCONNECTION OF INTRINSICALLY SAFE APPARATUS TO ASSOCIATED APPARATUS
NOT SPECIFICALLY EXAMINED IN SUCH COMBINATION. THE CRITERIA FOR INTERCONNECTION IS THAT THE VOLTAGE AND
CURRENT WHICH INTRINSICALLY SAFE APPARATUS CAN RECEIVE AND REMAIN INTRINSICALLY SAFE, CONSIDERING FAULTS, MUST BE
EQUAL TO OR GREATER THAN THE VOLTAGE (Voc) AND CURRENT (Isc) LEVELS WHICH CAN BE DELIVERED BY THE
ASSOCIATED APPARATUS. CONSIDERING FAULTS AND APPLICABLE FACTORS. IN ADDITION, THE MAXIMUM UNPROTECTED CAPACITANCE AND
INDUCTANCE (Ci & Li) OF THE INTRINSICALLY SAFE APPARATUS. INCLUDING INTERCONNECTING WIRING. MUST BE EQUAL TO OR LESS THAN
THE CAPACITANCE AND INDUCTANCE WHICH CAN BE SAFELY CONNECTED TO ASSOCIATED APPARATUS.
4. INSTALLATION MUST BE IN ACCORDANCE WITH THE NATIONAL ELECTRICAL CODE (NFPA 70, ARTICLE 504) AND ANSI/ISA-RP12.6.
IMPORTANT! NO REVISIONS WITHOUT
PRIOR UNDERWRITERS LABORATORIES
APPROVAL CAN BE IMPLEMENTED
01-700797-00
01-700797-00
HAZARDOUS (CLASSIFIED) LOCATION
INTRINSICALLY SAFE
FOR CLASS I DIV.1 GROUPS A,B,C,D
CLASS II DIV. 1 GROUP E,F,G
CLASS III DIV. 1
T4 TEMPERATURE CODE BASED ON 80˚C AMBIENT
NONHAZARDOUS LOCATION
ASSOCIATED APPARATUS
WITH ENTITY PARAMETERS
RED
OR PIN 1
IS626, PBLTX OR SBLTX SERIES
TRANSDUCERS
BLACK
OR PIN 4
Vmax = 28VDC
Imax = 93mA
Ci= .051µF
Li= 240µH
Pi= 0.651W
CATALOG NUMBERS:
IS626-aa-bb-cc-dd-ee-ffff
PBLTX-aaa-bbb-cccc
SBLTX-aa-bb-cccc
WHERE:
a,b,c,d,e & f = ANY LETTER OR NUMBER
BULLETIN ARTWORK
INTRINSIC SAFETY
CONTROL DRAWING FOR
IS626, PBLTX & SBLTX SERIES
SCALE 1:1
3FR. NO.
Voc ≤28 V
Isc ≤93 mA
Ca≥0.051 µF + CCABLE
La≥240 µH + LCABLE
Po≤0.651W
CD = CRITICAL DIMENSION
STANDARD TOLERANCES UNLESS NOTED:
ALL DECIMAL DIMENSIONS ± .005
ALL ANGLES ± 1˚
1
NO.
ADDED LABELS TO PLUS & MINUS TERMINALS.
ADDED Pi & Po = 0.651W TO BOXES. ECR #21141.
CHANGES BY/DATE
DATE
7-14-06
DATE
7-14-06
DWN BY
DGH
CHKD
CAT
APPD
SE
NAME
ACAD2002
MATERIAL
FINISH
NOTICE: This drawing and the principles and elements of design embodied therein are the exclusive property of DWYER INSTRUMENTS, INC. and are not
to be communicated, disclosed, reproduced or used except as previously authorized in writing by such corporation and must not be submitted to outside
parties for examination without the written consent of said corporation.
BRENT
1-22-07
2
L23_test:Layout 1 12/7/09 8:48 AM Page 3
MERCOID DIVISION
DWYER INSTRUMENTS, INC.
P.O. BOX 258 • MICHIGAN CITY, IN 46361 U.S.A.
Phone: 219/879-8000 www.dwyer-inst.com
©Copyright 2009 Dwyer Instruments, Inc. Printed in U.S.A. 12/09 FR# M2-443549-00 Rev. 2
L23_test:Layout 1 12/7/09 8:48 AM Page 4
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