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Measurement Computing MEAS LT User Manual

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

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  • Page 1 MEAS LT Level & Pressure Transducers USER MANUAL EDITION, March 2013...

  • Page 2: Table Of Contents

    User Manual MEAS LT Level & Pressure Transducer User Manual 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 &...
  • Page 3 User Manual MEAS LT Level & Pressure Transducer User Manual 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 &...

  • Page 4: Product Description

    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.

  • Page 5: Product Accessories & Options

    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.

  • Page 6: Absolute/Sealed Gage Transducer

    User Manual MEAS LT Level & Pressure Transducer User Manual 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.

  • Page 7: Lightning Protection

    User Manual MEAS LT Level & Pressure Transducer User Manual 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.

  • Page 8: Electrical Outputs

    User Manual MEAS LT Level & Pressure Transducer User Manual 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.

  • Page 9: Installation & Maintenance Tips

    User Manual MEAS LT Level & Pressure Transducer User Manual 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.

  • Page 10: Cable Protection

    User Manual MEAS LT Level & Pressure Transducer User Manual 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.

  • Page 11: Vdc Wiring

    User Manual MEAS LT Level & Pressure Transducer User Manual 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.

  • Page 12: Clogged Nose Piece Or Dirty Diaphragm

    User Manual MEAS LT Level & Pressure Transducer User Manual 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.

  • Page 13: Cleaning Steps

    User Manual MEAS LT Level & Pressure Transducer User Manual 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.

  • Page 14: Warranty & Product Return Procedure

    User Manual MEAS LT Level & Pressure Transducer User Manual 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.
  • Page 15 User Manual MEAS LT Level & Pressure Transducer User Manual 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...

  • Page 16: Appendix A Drawings & Diagrams

    User Manual MEAS LT Level & Pressure Transducer User Manual 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.
  • Page 17 User Manual MEAS LT Level & Pressure Transducer User Manual Cable Anchoring Schemes: Reference Connection Schemes: Submersible Cable Termination: 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 WL.sales@meas-spec.com...

  • Page 18: Appendix B Frequently Asked Questions

    User Manual MEAS LT Level & Pressure Transducer User Manual Appendix B: Frequently Asked Questions 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.
  • Page 19 User Manual MEAS LT Level & Pressure Transducer User Manual 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.
  • Page 20 User Manual MEAS LT Level & Pressure Transducer User Manual an option, we do offer titanium for more aggressive environments. Question: What wire gauge should I limit myself to when connecting to your 22 AWG wire? Answer: Use 22 AWG or heavier.

  • Page 21: Appendix C Transducer Field Checks & Troubleshooting

    User Manual MEAS LT Level & Pressure Transducer User Manual Appendix C: Transducer Field Checks The following is a field check procedure for KPSI Level and Pressure Transducers. It is designed to provide the information you need to isolate problems that may occur when deploying a transducer. These checks will help eliminate the costly and time-consuming RMA process by determining in advance whether the transducer is operating properly.
  • Page 22 User Manual MEAS LT Level & Pressure Transducer User Manual Batteries are suggested to power the transducer during testing to eliminate the possibility that line noise is passing through an improperly filtered, grounded, or damaged installation power supply. The meter should be a digital type capable of reading at least 2 digits to the right of the decimal point.
  • Page 23 0.658 volts To find out how much voltage is required to drive our MEAS LT submersible level transducer's 4-20 mA signal 10,000 feet, just add the minimum power requirement of the LT transducer (9 VDC) to the resistance offered by 10,000 feet (3048 m) of our polyurethane jacketed cable (10,000÷1000 x...
  • Page 24 User Manual MEAS LT Level & Pressure Transducer User Manual relatively minor transient voltages. The only exception to this rule is if high rates of electrolytic corrosion have been previously experienced with grounded submersible devices. In this case it may be better to leave the shield disconnected.
  • Page 25 User Manual MEAS LT Level & Pressure Transducer User Manual not maintaining the desiccant vent filter or of operating the transducer without a desiccant filter or aneroid bellows. If caught early enough, the transducer can be saved by coiling the cable and transducer in a pan and º...
  • Page 26 User Manual MEAS LT Level & Pressure Transducer User Manual in order to prevent "crust" formation. Symptom: Readings increase very slowly over time Procedure: Our cable is shipped coiled and consequently takes time to straighten when installed. Attaching a weight to the transducer (e.g., one of our sacrificial anodes) will help.
  • Page 27 Symptom: I am testing a MEAS LT 4-20mA sensor for use with our data logger. On page 13 of the MEAS LT Level and Pressure Transducers User Manual, I see the standard 4-20mA configuration. Does the recording...
  • Page 28 In this case the appropriate choice for a load resistor value is 125 Ohms. Symptom: I have a MEAS LT 4-20mA transducer rated for 7.5 PSIG attached to a pressure source that is outputting 7.5 PSIG. With 20VDC being supplied I am getting 19.94 mA.
  • Page 29 User Manual MEAS LT Level & Pressure Transducer User Manual depth. In order to approximately determine the depth of a transducer (in feet) using a given value of milliamps: 1. Divide the full-scale range of the transducer (in feet) by 16.

  • Page 30: Appendix D Calibration Calculations

    MEAS LT Level & Pressure Transducer User Manual Appendix D: Calibration Calculations A calibration report option for each MEAS LT Level and Pressure Transducer is available at time of order. This sheet lists the actual values that were output by the transducer, when it was being manufactured, at several different pressures.
  • Page 31 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 30 of 31 1-800-745-8008 WL.sales@meas-spec.com...
  • Page 32 User Manual MEAS LT Level & Pressure Transducer User Manual In this case, even though the offset or 0 PSIG output was 3.9565 mADC and the full-scale point was 19.9310 mADC, the unit actually performed better than its specified accuracy of ±0.25% of full-scale range (as indicated in the Error % FSO column) and is called out as maximum static error 0.1764%...
  • Page 33 100 Lucas Way Hampton, VA 23666 USA Office: 757-766-1500 Toll Free: 800-745-8008 Fax: 757-766-4297 www.meas-spec.com Email: WL.sales@meas-spec.com Online orders: www.levelandpressure.com...

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