Measurement Computing MEAS LT User manual

MEAS LT
Level & Pressure
Transducers
USER MANUAL
1st EDITION, March 2013

User Manual
MEAS LT Level & Pressure Transducer User Manual
Measurement Specialties, Inc. www.meas-spec.com 1-757-766-1500
1000 Lucas Way, Hampton, VA 23666 USA 1 of 31 1-800-745-8008
W[email protected]
Table of Contents
1.0 PRODUCT DESCRIPTION ....................................................................................... 3
General Characteristics ................................................................................................ 3
Care and Handling ....................................................................................................... 3
Calibration .................................................................................................................... 3
Approvals ..................................................................................................................... 3
2.0 PRODUCT ACCESSORIES & OPTIONS ................................................................. 4
Nose Caps & Pressure Connections ............................................................................ 4
810 SuperDry™ Vent Filter or 815 Aneroid Bellows .................................................... 4
Sacrificial Anodes ........................................................................................................ 4
Absolute/Sealed Gage Transducer .............................................................................. 5
Polyurethane & ETFE Jacketed Cable ......................................................................... 5
Lightning Protection ..................................................................................................... 6
Electrical Outputs ......................................................................................................... 7
Cable Hanger ............................................................................................................... 7
Submersible Cable Splicing Kit .................................................................................... 7
3.0 INSTALLATION & MAINTENANCE TIPS ................................................................ 8
General Installation Procedures ................................................................................... 8
Transducer Anchors ..................................................................................................... 8
Transducer Submersion ............................................................................................... 8
SuperDry™ Vent Filter (Desiccant) or Aneroid Bellow Installation ............................... 8
Cable Protection .......................................................................................................... 9
Bending of Cable ......................................................................................................... 9
Cable Compression...................................................................................................... 9
4-20 mA Wiring ............................................................................................................ 9
VDC Wiring ................................................................................................................ 10
Protective Cage Diaphragm Protector........................................................................ 10
Position Sensitivity ..................................................................................................... 10
General Maintenance Tips for Submersible Transducers .......................................... 10
Desiccant Maintenance .............................................................................................. 10
Clogged Nose Piece or Dirty Diaphragm ................................................................... 11
Cleaning your Transducer .......................................................................................... 11
Preparation ................................................................................................................ 11
Cleaning Steps ........................................................................................................... 12
Cleaning the Lightning Protection Data Line Protector .............................................. 12

User Manual
MEAS LT Level & Pressure Transducer User Manual
Measurement Specialties, Inc. www.meas-spec.com 1-757-766-1500
1000 Lucas Way, Hampton, VA 23666 USA 2 of 31 1-800-745-8008
W[email protected]
4.0 WARRANTY & PRODUCT RETURN PROCEDURE ............................................. 13
Product Eligibility ........................................................................................................ 13
Merchandise Return Procedures ............................................................................... 13
APPENDIX A DRAWINGS & DIAGRAMS ................................................................... 15
APPENDIX B FREQUENTLY ASKED QUESTIONS.................................................... 17
APPENDIX C TRANSDUCER FIELD CHECKS & TROUBLESHOOTING .................. 20
APPENDIX D CALIBRATION CALCULATIONS ......................................................... 29

User Manual
MEAS LT Level & Pressure Transducer User Manual
Measurement Specialties, Inc. www.meas-spec.com 1-757-766-1500
1000 Lucas Way, Hampton, VA 23666 USA 3 of 31 1-800-745-8008
W[email protected]
1.0 Product Description
General Characteristics
MEAS LT Level and Pressure Transducers use isolated diaphragm sensors that can be used in
aggressive applications with hostile fluids and gases. These sensors utilize a silicon pressure cell that
has been fitted into a stainless steel or titanium package with an integral, compliant stainless steel or
titanium barrier diaphragm. This sensor assembly is housed in a rugged 316 stainless steel or
titanium case which provides for a variety of level ranges from 2.3 ft (0.75 m) H2O through 692 ft
(210.9 m) H
2
O and pressure inputs from 1 psi (7 kPa) through 2000 psi (13 mPa). Our devices
feature internal signal conditioning. Standard outputs are 4-20 mA and VDC.
All units containing active electronic components have surge and reverse polarity protection. For
ease of use in the field, our transducers are permanently laser engraved with our logo and name,
wiring information, part number (P/N), serial number (S/N), date of manufacture (DOM), range,
excitation and output. L T transducers are offered in 1.0” (25 mm) diameters.
Care and Handling
Our transducers are designed for rugged use. However, they need protection from over pressure and
sharp impact. Penetrate the surface slowly, vertically and only to the depth necessary when lowering
a transducer into a liquid. Avoid dropping the unit from above the surface. Clean all transducers by
rinsing them in a mild detergent. Direct probing of the diaphragm or attempts to remove protective
screens will damage the sensor, voiding the warranty.
Calibration
Calibration reports unique for each transducer are available for all MEAS LT transducers. This option
must be ordered at time of order placement. Make sure you keep each calibration report. However,
should you misplace your calibration sheet; you can contact the factory and request a duplicate. All
MEAS LT Transducer calibrations are traceable to the National Institute of Standards and Technology
(NIST).
Approvals
UL and FM certification for intrinsic safety options are available for MEAS LT transducers. Their
respective installation control drawings can be downloaded from our website. Several of our product
lines also carry ABS approval. Most products are CE compliant to EN 61326-1:2006 and EN 61326-2-
3:2006. CE compliant units are labeled accordingly.
These units are designed for installation in a Class I, Division 1, Groups A, B, C, and D, Class II,
Division 1, Groups E, F and G, Class III, Division 1 hazardous location when connected to appropriate
apparatus such as those manufactured by R. G. Stahl, Inc., and others.

User Manual
MEAS LT Level & Pressure Transducer User Manual
Measurement Specialties, Inc. www.meas-spec.com 1-757-766-1500
1000 Lucas Way, Hampton, VA 23666 USA 4 of 31 1-800-745-8008
W[email protected]
2.0 Product Accessories and Options
WARNING: POTENTIAL ELECTROSTATIC CHARGING HAZARD
In hazardous locations:
● Avoid building up static charge on case of data protector and plastic accessories.
● Use damp rag to wipe data protector and plastic accessories to avoid static build up.
Nose Caps and Pressure Connections
There are several different pressure connection options for the MEAS LT submersible level and
pressure transducer product line.
 The LTA features a ported nose cap (Delrin) with #8-32UNC-2B threaded-hole where weight
accessories can be attached.
 The LTB features a wide mouth non-fouling cage protecting a 2.75” PTFE flexible diaphragm.
 The LT1 features a ¼” – 18 female NPT pressure connection.
 The LT5 features a ¼” – 18 male NPT pressure connection.
 The LT7 features a ½” – 18 male NPT pressure connection.
WARNING: Caution must be exercised when inserting a screw into the nose cap as the
maximum insertion length should not exceed 0.175”.
810 SuperDry™ Vent Filter or 815 Aneroid Bellows
All submersible level transducers and pressure transducers with molded cable attachment require an
optional protective barrier that guards against moisture buildup in the cable vent tube. The 810
SuperDry™ vent filter and the 815 Aneroid Bellows are guaranteed to operate maintenance free for
one year. The 815 Aneroid Bellows can be used on submersibles with accuracies of ±0.25% FSO.
These barriers ensure reliable operation and long life as they protect sensitive electronic components
from mildew and prevent the formation of a liquid column in the vent tube. Any such liquid column
directly affects the instantaneous calibration of the transducer. Transducers with accuracy better than
+1 – 0.25% should only be protected with the 810 vent filter in order to maintain this accuracy.
Sacrificial Anodes
Our sacrificial anodes are made from a special zinc alloy formulated to guarantee continued
effectiveness over long periods. Because the anodes are 95% galvanic, they will not corrode unless
there is an electrolytic demand. The anode maintains a high driving potential throughout its 12 month
life, is self-sloughing and always exposes new zinc for the best possible protection. For those
applications where cable buoyancy is a problem, the sacrificial anode can be substituted for hanging
weights.
Sacrificial Anodes provide cathodic protection against galvanic corrosion for our submersible pressure

User Manual
MEAS LT Level & Pressure Transducer User Manual
Measurement Specialties, Inc. www.meas-spec.com 1-757-766-1500
1000 Lucas Way, Hampton, VA 23666 USA 5 of 31 1-800-745-8008
W[email protected]
transducers. Galvanic corrosion occurs when dissimilar metals are placed in contact with an
electrolyte. This condition causes a potential difference to exist between the two metals, causing
electron flow between them. Corrosion of the less corrosion-resistant metal is increased and attack of
the more resistant metal is decreased. The 820 Sacrificial Anode is clamped to the exterior of a one-
inch bore submersible transducer. We also offer a 1" diameter pencil anode, the 825, that attaches to
the MEAS LTA nose cap.
Absolute/Sealed Gage Transducer
The sealed gage option for submersible transducers eliminates the need for a vent filter. The
standard output of a sealed gauge transducer is 4 mA at 14.70 psia. The output of the transducer will
need to be adjusted to compensate for the altitude difference with a separate barometric unit, if
necessary.
Polyurethane & ETFE Jacketed Cable
Most installations of our submersible level transducers connect our polyurethane or ETFE cable to a
junction box. From this junction box (P/N 840), users typically run their own cable to the required
instrumentation. Polyurethane-jacketed cable is used for most applications while ETFE material is
recommended for more aggressive environments.
Specifications for our standard polyurethane and ETFE jacketed cable are as follows:
Specifications
Standard
Submersible Cable
Standard
Non-Submersible Cable
Weight
0.05 lbs/ft (0.07 kg/m)
0.025 lbs/ft (0.035 kg/m)
Min. OD
0.28" (7.10 mm)
0.189" (4.8 mm)
Max OD
0.31" (7.87 mm)
0.19" (4.9 mm)
Conductors
4 - 22 AWG
22 AW G
Insulation
Conductors
Outer jacket
Polyurethane, ETFE or
PVC
Color coded PVC
Shield
36 gauge spiral tinned
copper wire foil shield with
drain wire
Aluminum/polyester foil
facing outward
Vent Tube
Polyethylene, .060" ID
(1.52 mm)
Drain wire
7/32 tinned copper

User Manual
MEAS LT Level & Pressure Transducer User Manual
Measurement Specialties, Inc. www.meas-spec.com 1-757-766-1500
1000 Lucas Way, Hampton, VA 23666 USA 6 of 31 1-800-745-8008
W[email protected]
Chemical resistance of polyurethane:
Potable Water, Wastewater, Borax, Butane, Animal Fat, Carbonic Acid, Citric Acid, Cod Liver Oil,
Corn Oil, Glycerin, Glycol, Mineral Oils, Potassium Nitrate, Potassium Sulfate, Silicone Oils, Stoddard
Solvent, Tannic Acid (10), Tartaric Acid, Turbine Oil.
Chemical resistance of ETFE:
Acetic Acid (Glacial), Acetic Anhydride, Acetone, Aluminum Chloride, Anti- Freeze, Bromine, Calcium
Chloride, Calcium Hydroxide, Chlorine, Copper Chloride, Ferrous Chloride, Hydrochloric Acid,
Ketones, Lacquer Thinners, Sulfuric Acid.
The vented cable termination end is specially prepared at the factory to eliminate the potential for
moisture migration. Where the lead wires emerge from under the jacket, there’s potting material and
a shrink tube “boot”, every effort should be made to leave this feature intact. Should the cable be
longer than needed for the installation, it is recommended that the excess length be accommodated in
a service loop and that the potted end of the cable NOT be shortened.
The cable attached to this instrument is specifically engineered for submersible applications. The
polyurethane outer jacket provides long term reliability under most conditions. The cable should be
handled carefully, however, as the jacket may be subject to cutting should it be “raked” over extremely
sharp edges. To guard against water incursion should an inadvertent minor cut occur, we have
incorporated an exclusive “water block” feature immediately beneath the jacket. The cable is fully
shielded, with the shield connected to the metal housing at the transducer end and terminated in a
drain wire at the termination or user end. The shield should always be terminated to a good earth
ground, unless the transducer is installed in an area where galvanic corrosion is known to be a
serious problem.
Lightning Protection
Lightning and surge protection for VDC and 4-20 mA output are available. This is achieved through
the use of 2 protectors, one is integral to the transducer housing and one is provided for the outside
line located at the surface and grounded to a DIN-Rail. Please remember this option must be factory
installed at the time of order entry or as a factory upgrade. This option cannot be installed in the
field. Lightning protection is also available for unit only. Contact customer service for details.
Featuring quick response and low clamping voltages, these devices protect against fast rising voltage
transients as well as severe current surges associated with lightning discharges up to 20,000
amperes. Following a surge, the protector automatically restores the line to normal operation and
awaits the next surge without having to reset a breaker or replace a fuse. The power supply needs to
be limited to 150 mA to avoid lock up of the gas tube after a suppression event. If a lock-up should
occur, this is reset by disconnecting and reconnecting power to the circuit.
Transducers installed with this option have a two year warranty against damage due to voltage
surge.
Please note: When using the lightning protection option on 4-20 mA products, users should
take into account the additional series resistance of this option when selecting the loop power
supply. This option will increase total loop resistance by 88 Ohms, so the supply voltage must
be at least 12VDC when lightning protection is installed.

User Manual
MEAS LT Level & Pressure Transducer User Manual
Measurement Specialties, Inc. www.meas-spec.com 1-757-766-1500
1000 Lucas Way, Hampton, VA 23666 USA 7 of 31 1-800-745-8008
W[email protected]
Electrical Outputs
We offer the industry standard 0-5 VDC and 4-20 mA outputs. In addition we also offer a variety of
voltage output ranges.
Cable Hanger
We can supply an optional cable hanger (P/N 12-90-0931) to help end users secure the cable. The
cable hanger can be positioned anywhere on the cable by pushing the ends together. Once
positioned, the cable hanger expands and provides a snug grip on the cable.
When mounting the transducer in a well casing, the cable hanger can be secured to a hook on the
well plate or an eye bolt may be attached to the side of the well casing. The cable hanger loop is then
secured to the eye bolt by using any number of types of fasteners. A similar technique can be used
when working in stilling wells for surface water level measurement. In this case, the loop- end of the
cable hanger can be attached directly to a screw or bolt bored into the still well shelf.
Submersible Cable Splicing Kit
Our field-installable cable splice kit (P/N 830) allows you to splice polyurethane and ETFE
submersible cable. It is most commonly used for well applications where the more expensive ETFE
cable is required for suspension in corrosive media where the liquid level is fairly shallow, but the well
is hundreds of feet in depth. It is also used in emergency situations where cable must be spliced
together to get an application up and running.

User Manual
MEAS LT Level & Pressure Transducer User Manual
Measurement Specialties, Inc. www.meas-spec.com 1-757-766-1500
1000 Lucas Way, Hampton, VA 23666 USA 8 of 31 1-800-745-8008
W[email protected]
3.0 Installation & Maintenance Tips
WARNING: POTENTIAL ELECTROSTATIC CHARGING HAZARD
In hazardous locations:
● Avoid building up static charge on case of data protector and plastic accessories.
● Use damp rag to wipe data protector and plastic accessories to avoid static build up.
General Installation Procedures
The following is important installation and preventive maintenance information. Our Customer Service
or Applications Engineering Support staff can provide additional instruction.
Transducer Anchors:
Most users either suspend our submersible transducers in stilling wells or attach them to rigid conduit.
This is done to prevent damage to the transducer from shock caused by water turbulence. It is not
advisable to tie your transducer to a pump or to piping, as any problem with the transducer could
require that the pump be pulled from the installation. This could prove to be very expensive. (Please
refer to the Cable Anchoring Schemes drawing in Appendix A.)
Some applications use our optional bracket (P/N 49-06-00PC) to clamp the transducer to a fixed
object (i.e., wall, ladder, step) or require the unit to be suspended without any protective still well or
attachment device. In all installations, care should be taken to ensure no damage occurs to the cable.
Transducer Submersion:
Damage to submersible cable is one of the most frequent causes of transducer failure. Lower your
transducer into the liquid slowly, making sure the cable does not drag over sharp edges and only to
the depth necessary. Avoid dropping the unit from the surface.
SuperDry™ Vent Filter (Desiccant) or Aneroid Bellows Installation:
(For submersible transducers vented gage pressure format only)
Always install a desiccant vent filter or aneroid bellows immediately after transducer installation.
Failure to use one or the other could result in premature failure of the transducer; which would not be
covered by warranty. If you use a desiccant filter, you should establish a regular maintenance
schedule. You should change your vent filter when it is 75% spent (pink color). Replacement filters
are available at a nominal cost from the factory. Do not remove the old vent filter until a new one is
available. The most common failure mode of our transducers is moisture and corrosion damage due
to lack of use or maintenance of the vent filter. This will allow air into the desiccant filter and allows
the transducer to properly vent with changes in barometric pressure.

User Manual
MEAS LT Level & Pressure Transducer User Manual
Measurement Specialties, Inc. www.meas-spec.com 1-757-766-1500
1000 Lucas Way, Hampton, VA 23666 USA 9 of 31 1-800-745-8008
W[email protected]
To install/replace either the aneroid bellows or the vent filter, simply unplug the old unit from the vent
tube and plug the 0.062" x 1" stainless steel connector tube (supplied with each filter or bellows) into
the vent tube. (Installation and mounting instructions are supplied with each aneroid bellows and vent
filter.) The diagram on page 16 shows typical vent filter and aneroid bellows hookups.
Cable Protection:
An inexpensive way to protect the cable from damage is to order the submersible pressure transducer
with a ½" conduit attachment. If further protection is needed, connect an inexpensive flexible 5/8"
garden hose to the ½" conduit fitting with an inexpensive female PVC ½" NPT x 3/4" NHT swivel
fitting, available at your local hardware store. These options are not supplied by MEAS.
Bending of Cable:
Our polyurethane and ETFE jacketed cables are quite flexible. Care needs to be taken to ensure that
when bending the cable to suit your installation you do not crimp the vent tube inside the cable.
Consequently, do not bend the cable more than a radius of 1 inch.
Cable Compression:
Many users require a compression fitting to secure our ETFE and polyurethane jacketed cable as it
enters a junction box. Care needs to be taken that you do not over-tighten the fitting so as to damage
the cable. Compression fittings are not supplied by MEAS.
4-20 mA Wiring:
When connecting a 2-wire 4-20 mA transducer to a typical power supply and mA meter, verify that the
meter has an input impedance of at least 10 Ohms. If you are unsure of the input impedance, then a
10 Ohm resistor may be placed in series with the meter and transducer. Connect the + (red) lead of
the transducer to the + terminal of the power supply. If the 10 Ohm resistor is required, connect it to
the - (black) lead of the transducer. Use a short length of 22 AWG or heavier wire to connect the +
terminal of the meter to the resistor (if it is required) or the - (black) wire of the transducer. Connect
the - terminal of the meter to the - terminal of the power supply with a length of 22AWG or heavier
wire. Connect the drain wire from the transducer to a good earth ground. (See Appendix A, page 13
for wiring diagram.) Please refer to “Maximum Cable Lengths and Minimum Supply Voltage” in
Appendix C, page 19 to verify minimum loop supply voltage requirements.

User Manual
MEAS LT Level & Pressure Transducer User Manual
Measurement Specialties, Inc. www.meas-spec.com 1-757-766-1500
1000 Lucas Way, Hampton, VA 23666 USA 10 of 31 1-800-745-8008
W[email protected]
VDC Wiring:
Connect a 3 wire VDC output transducer to a typical power supply and the voltmeter, connect the -
terminal of the power supply to the - input terminal of the meter with a length of 22 AWG or heavier
wire. Connect the - excitation (black) lead of the transducer to the - input terminal of the meter.
Connect the + input terminal of the meter to the signal lead (white) of the transducer. Connect the +
terminal of the power supply to the + lead (red) of the transducer. Connect the drain wire to a good
earth ground. (See Appendix A, page 13.)
Protective Cage Diaphragm Protector:
The MEAS LTB comes standard with a field removable diaphragm protector (one-inch or 25 mm
standoff). The protective cage diaphragm protector can easily be taken off by removing six (6)
fasteners located on the bottom of the unit.
Position Sensitivity:
The transducer should be installed so that the diaphragm located behind the nose cap is oriented in a
vertical position, otherwise the unit could exhibit an offset.
General Maintenance Tips for Submersible Transducers:
Desiccant Maintenance
WARNING: POTENTIAL ELECTROSTATIC CHARGING HAZARD
In hazardous locations:
● Avoid building up static charge on case of data protector and plastic accessories.
● Use damp rag to wipe data protector and plastic accessories to avoid static build
up.
If you use a desiccant vent filter, you should establish a regular maintenance schedule. You should
change your vent filter when it is 75% spent (pink color). Replacement filters are available at a
nominal cost from the factory. Do not remove the old vent filter until a new one is available.
Remember that Measurement Specialties’ improved 810 SuperDry™ Vent Filter is designed to be
effective for at least one year before requiring replacement.

User Manual
MEAS LT Level & Pressure Transducer User Manual
Measurement Specialties, Inc. www.meas-spec.com 1-757-766-1500
1000 Lucas Way, Hampton, VA 23666 USA 11 of 31 1-800-745-8008
W[email protected]
Clogged Nose Piece or Dirty Diaphragm:
Either of these conditions could result in erroneous readings from your transducer.
WARNING: NEVER attempt to clean your transducer’s nose piece or diaphragm with any
object. This could dent or scar the sensor diaphragm and cause permanent damage to the
transducer.
Your transducer may be cleaned in accordance with the procedures listed in step 4, below.
Cleaning your transducer:
Materials required:
 Plastic bowls 8-12 inches (200-300 mm) in diameter and 4-6 inches (100 - 150 mm) deep
 Supply of clean, lint-free cleaning rags
 32 ounce bottle of a mild detergent
Preparation:
 Prior to cleaning your pressure transducer, ensure that all procedures have been followed
in the proper cleaning of the cable and transducer to remove any hazardous materials.
 The vent filter (or bellows) must be properly attached.
 The cable should be coiled to ensure ease of handling and it must be protected against
the possibility of accidental abrasion and/or penetration of the cable jacket by sharp
objects.
 A lead length of 1 to 1 ½ feet (0.3 - 0.45 m) of cable from the transducer should be
allowed to facilitate handling during cleaning.
 The protective covering (or similar protective device) that is shipped with each transducer
should be attached to the transducer at all times. It should only be removed prior to
installation or cleaning.
Your work surface needs to be clean and free of clutter and large enough to accommodate all
materials required in addition to the transducer and cable. Fill one of the bowls with fresh water, one
with a mild detergent mixed with water and the last with 16 ounces (0.45 kg) of a bath/bath tub type
cleaner.

User Manual
MEAS LT Level & Pressure Transducer User Manual
Measurement Specialties, Inc. www.meas-spec.com 1-757-766-1500
1000 Lucas Way, Hampton, VA 23666 USA 12 of 31 1-800-745-8008
W[email protected]
Cleaning:
Step 1: Holding the cable 6 inches (150 mm) from the transducer, immerse the unit in the bowl
containing the mild detergent and stir for 20-30 seconds. Remove and rinse in the bowl
containing the fresh water, using the same stirring motion used in the mild detergent.
Rinse and wipe dry.
Step 2: Holding the body of the transducer with one hand so that you are looking at the retaining
screen protecting the sensor, carefully remove the sensor nose piece by simply
unscrewing it from the transducer body. Do not touch the sensor diaphragm with your
finger or any other object. Also, do not try to dry the inside portion of the transducer, as
you risk damaging the pressure sensor.
Step 3: Place the transducer in a vertical position with the sensing end facing downward in the
bowl containing a mild cleaning solution for approximately 15-20 seconds. Rinse in the
bowl containing clean water and wipe dry the external casing only. Place the protective
screen in the same solution for 15- 20 seconds, rinse and wipe dry.
Step 4: Holding the transducer in a vertical position so that you can see the face of the sensor,
screw the protective nose piece back into place.
Cleaning the Lightning Protection Data Line Protector
WARNING: POTENTIAL ELECTROSTATIC CHARGING HAZARD
In hazardous locations:
● Avoid building up static charge on case of external surge protector and plastic
accessories.
● Use damp rag to wipe data protector and plastic accessories to avoid static build up.

User Manual
MEAS LT Level & Pressure Transducer User Manual
Measurement Specialties, Inc. www.meas-spec.com 1-757-766-1500
1000 Lucas Way, Hampton, VA 23666 USA 13 of 31 1-800-745-8008
W[email protected]
4.0 Warranty and Product Return Procedure
Product Eligibility:
Any transducer/transmitter (see 4-digit DOM) that is:
Less than 2 years old: Units that fall within this age group that do not meet the product’s
specifications and exhibits no obvious physical damage to the housing, sensor, or cable (cuts),
will be replaced under warranty.
Units 2-3 years old: Units that fall within this age group and exhibit no obvious physical damage to
the housing, sensor, or cable (cuts), may be replaced at a discounted list price.
Units greater than 3 years old: Units that fall within this age group are not replaced under warranty.
Merchandise Return Procedures
Contact the Applications Support Group or the Customer Service Department at Measurement
Specialties, Inc, Hampton, VA, if your transducer is not operating properly. Our staff is available for
troubleshooting at (757) 766- 1500 or toll free at 1-800-745-8008 during normal working hours,
Eastern Time. If your transducer or accessory needs to be returned to Measurement Specialties,
obtain a Returned Merchandise Authorization (RMA) from the Customer Service Department prior to
shipment. Be prepared to supply the following information when requesting the RMA:
 Part number
 Serial number
 Complete description of problems/symptoms
 Bill To and Ship To address
 Purchase order number (not required for warranty repairs)
 Customer contact and telephone number
The above information, including the RMA number, must be on the customer’s shipping documents
that accompany the equipment to be repaired. Measurement Specialties also requests that the
outside of the shipping container be labeled with the RMA number to assist in tracking the repairs.
All equipment should be sent to the following address:
ATTN: MEAS LT TRANSDUCER REPAIR DEPARTMENT
(7-digit RMA number)
Measurement Specialties
1000 Lucas Way
Hampton, VA 23666

User Manual
MEAS LT Level & Pressure Transducer User Manual
Measurement Specialties, Inc. www.meas-spec.com 1-757-766-1500
1000 Lucas Way, Hampton, VA 23666 USA 14 of 31 1-800-745-8008
W[email protected]
Prior to returning to Measurement Specialties, the transducer and cable must be cleaned per
instructions provided on the cleaning certificate supplied when the transducer was delivered.
The certificate can also be found on Measurement Specialties website:
 www.meas-spec.com
The completed certificate must accompany the transducer when shipped to Measurement Specialties.
If the transducer has been used in media other than potable water, Measurement Specialties
customer service must be notified at the same time an RMA number is requested. Measurement
Specialties reserves the right to reject any shipment deemed to be unsanitary or environmentally
unsafe to handle. If these guidelines are not met, the package will be sent back unopened and at
the customer’s expense.
Please include the attached cable, vent filter or aneroid bellow with each returned vented
gage submersible transducer.
Measurement Specialties will return warranty items prepaid via UPS GROUND. If the customer
desires another method of return shipment, Measurement Specialties will prepay and add the
shipping charges to the repair bill.
Incoming freight charges are the customer’s responsibility. The customer is also responsible for
shipping charges to and from Measurement Specialties for all equipment not under warranty.
Once the return is received, it typically takes 5-10 working days for the technician to complete a fault
determination.
A 60% Purchase Order Cancelation fee will be applied when the order is canceled within 24 hours of
placement. The order cannot be canceled after 24 hours of placement.
NOTE: Expedite premiums and shipping charges are non-refundable.

User Manual
MEAS LT Level & Pressure Transducer User Manual
Measurement Specialties, Inc. www.meas-spec.com 1-757-766-1500
1000 Lucas Way, Hampton, VA 23666 USA 15 of 31 1-800-745-8008
W[email protected]
Appendix A: Drawings and Diagrams
Wiring Diagrams for VDC and mA Outputs:
Notes:
These diagrams depict typical installations. Refer to your power supply and instrumentation
Manufacturer for the specifics of your application.

User Manual
MEAS LT Level & Pressure Transducer User Manual
Measurement Specialties, Inc. www.meas-spec.com 1-757-766-1500
1000 Lucas Way, Hampton, VA 23666 USA 16 of 31 1-800-745-8008
W[email protected]
Cable Anchoring Schemes:
Reference Connection Schemes:
Submersible Cable Termination:

User Manual
MEAS LT Level & Pressure Transducer User Manual
Measurement Specialties, Inc. www.meas-spec.com 1-757-766-1500
1000 Lucas Way, Hampton, VA 23666 USA 17 of 31 1-800-745-8008
W[email protected]
Appendix B: Frequently Asked Questions
1.
Question:
What installation ideas do you have to help me get rid of electrical
noise interfering with the signal?
Answer:
We strongly encourage you to secure our cable shield to a good earth
ground and that you use a 4-20 mA signal output. Armed with these
precautions and the fact that many of our transducers are CE approved for
electromagnetic interference, you should have few problems. An ounce of
prevention goes a long way. Either try to eliminate the source of noise or
move the transducers as far away from it as possible.
2.
Question:
The cable on the submersible transducer always seems to get cut and
damaged. What am I doing wrong?
Answer:
This is the most common problem that our users encounter. Make sure that
all of your colleagues and staff understand the importance of handling the
cable with care. The cable should not be bent around rough or sharp edges.
Always use a cable reel during transport. Where possible, suspend the unit
in a perforated 2” (50 mm) PVC pipe and thread the cable through protective
conduit to the nearest junction box.
3.
Question:
I have an application where the transducer is frequently damaged by
voltage spikes. What can be done to prevent this?
Answer:
At a minimum, make sure the cable shield is connected to an earth ground
as near as possible to the transducer. We can provide a surge protection kit
for both our submersible and non-submersible transducers. See page 4.
These kits will handle typical spikes that might come in through the power
lines as well as surges that travel through the ground due to nearby lightning
strikes.
4.
Question:
How much impact shock can your submersible transducers withstand?
Answer:
Our transducers are not shock tested and the lower pressure ranges can be
damaged if dropped from several feet onto an unforgiving surface like
concrete. We recommend that the protective shipping sleeve remain in
place until the unit is installed.
5.
Question:
What is the response time of your transducer?
Answer:
From initial power up, the transducer output will stabilize within a fraction of a
second. The frequency response is rather low; probably less than 1 kHz, but
it depends on the application, the media, plumbing, etc. Call our factory for
application assistance if frequency response is critical in your application.

User Manual
MEAS LT Level & Pressure Transducer User Manual
Measurement Specialties, Inc. www.meas-spec.com 1-757-766-1500
1000 Lucas Way, Hampton, VA 23666 USA 18 of 31 1-800-745-8008
W[email protected]
6.
Question:
How do I attach your vent filter or aneroid bellows to my cable vent
tube?
Answer:
The vent filter can be mounted anywhere convenient, preferably out of the
weather. It can be mounted in any position and connects to the cable vent
tube via the extension tube with metal connector tube provided. The aneroid
bellows must be mounted in a way that its movement is not encumbered. It
is provided with a mounting base.
7.
Question:
What is the best way to mark my cable?
Answer:
Use white vinyl marking tape available from your local hardware or
electronics stores. These same stores may also sell cable marking kits.
Unfortunately we not provide this service.
8.
Question:
Any ideas for preventing marine growth on your submersible
transducers?
Answer:
You might want to try waterproof grease. Remove the threaded nose cap to
facilitate applying the grease. Take care not to damage the diaphragm
when applying the grease and not to trap air bubbles against the
sensing diaphragm
9.
Question:
How many measurements can you make before the diaphragm on the
sensor fails?
Answer:
In normal operation – millions of cycles. We find that sensor failure is rarely
due to diaphragm fatigue.
10.
Question:
What is the turnaround time on repairs?
Answer:
Once we receive a unit into our facility it takes less than 10 working days to
complete an evaluation.
11.
Question:
What is the longest length of cable you have attached to a submersible
transducer?
Answer:
Two thousand feet (610 meters).
12.
Question:
Why do you use 316 SS housings and sensors for your standard
transducers?
Answer:
It offers a good combination of corrosion resistance and reasonable cost. As

User Manual
MEAS LT Level & Pressure Transducer User Manual
Measurement Specialties, Inc. www.meas-spec.com 1-757-766-1500
1000 Lucas Way, Hampton, VA 23666 USA 19 of 31 1-800-745-8008
W[email protected]
an option, we do offer titanium for more aggressive environments.
13.
Question:
What wire gauge should I limit myself to when connecting to your 22
AWG wire?
Answer:
Use 22 AWG or heavier.
14.
Question:
Does it make any difference if I mount the transducer in a vertical or
horizontal position?
Answer:
Yes. Our units will experience a certain amount of position sensitivity. You
should mount it in a vertical position throughout the measurement cycle. If
you lay the transducer down, the user must realize than an offset will occur.
15.
Question:
What happens when you freeze your transducer in a column of water?
Answer:
We have frozen our transducers in a container of water in a home freezer
with no resulting damage. However, depending on the level range of the
unit, over pressure of the unit is possible. In harsh environments where
debris is common and ice shifts, you might expect damage to both the
transducer and cable.
16.
Question:
Why would I choose a MEAS transducer versus a competitor?
Answer:
Reliable, long lasting products
Rapid delivery
Lightning protection lifetime warranty
Excellent pre & post sales/application support
No hassle service