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Xentaur LPDT Скачать руководство пользователя страница 14

Section 2: Sensor and Sampling Techniques

page 7

2.3.2 Extractive Installation

For extractive installations we recommend our sample sys-
tem ESS, which may be equipped with a variety of features,
such as: isolation valve, coalescing or particulate filter,
pressure regulator, calibration sample injection or extraction
port, pressure gauge, flow meter, weatherproof enclosure.
Refer to the ESS literature for more information.
If the resources to make your own sample system are avail-
able, the following two diagrams may be used as a guideline
to configure a simple system.

LPDT

4-20mA loop cable

Exhaust

Regulator or

Needle V

alv

e

Safety shut-off Valve

Extractive Installation, Sensor

Measuring at Line Pressure

LPDT

4-20mA loop cable

Exhaust

Regulator or

Needle Valve

Extractive Installation, Sensor

Measuring at Ambient Pressure

Sample Cell

oint Transmitter

Ma

Se

Mo

Think

Safety

Read

Man

ual

www.xentaur.com

Sample Cell

oint Transmitter

Ma

Se

Mo

Think

Safety

Read

Man

ual

www.xentaur.com

Main

Gas Line

Main

Gas Line

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Содержание LPDT

Страница 1: ...4 Xen t a u r C o r p oration L o o p P owered Dewpoint T ra n s m itte r L P D T USER S M A N U A L ...

Страница 2: ...s the latest revision of this manual is available in Adobe Acrobat format at http www xentaur com Except as may be provided by contract this document and all specifications and drawings contained are the property of Xen taur Corporation are issued in strict confidence and shall not be reproduced or copied or transmitted in any form or by any means or used as the basis for the manufacture or sale o...

Страница 3: ... a trademark of Xentaur Corporation The customer agrees that in accepting and using this instru ment Xentuar Corporation s liability arising from or in any way connected with this instrument shall be limited exclu sively to performing a new calibration or replacement or repair of the instrument or sensor at Xentaur s sole option as covered by Xentaur s warranty In no event shall Xentaur be liable ...

Страница 4: ...SOR FROM ITS SHIPPING CONTAINER This manual is organized in three sections Section 1 is an overview of the LPDT Section 2 describes the sensor and sampling tech niques Section 3 describes the instrument s electrical mechanical and user interfaces This manual is intended for those already familiar with the installation use and maintenance of ana lytical or process instrumentation Those acquainted w...

Страница 5: ...enance Policy In cases when equipment fault is suspected please notify your representative of the problem be sure to provide them with model and serial numbers If the problem can not be resolved then ask for a Return Authorization Number RAN and shipping instruc tions Issuance of an RAN does not automatically imply that the equipment is covered by our warranty that will be determined after we rece...

Страница 6: ...15 3 3 2 Electrical Installation 16 3 4 Operating the Instrument 17 3 4 1 Starting up 17 3 4 2 Display Conventions 17 3 4 3 Push Buttons 19 3 4 4 Operating State 19 3 4 4 1 Viewing Dewpoint Mode 20 3 4 4 2 Viewing Temperature at the Sensor 20 3 4 4 3 Start Calibration SpanCheck Mode 21 3 4 4 4 Viewing Serial Number Mode 24 3 4 5 SetUp State 24 3 5 Troubleshooting the Instrument 28 Appendix A Opera...

Страница 7: ...LPDT User s Manual vi Appendix H Uncertainty in LBS ppmV calculations 43 Appendix I Sensor Response Time 44 Appendix J Return Authorization Request 45 ...

Страница 8: ... line without interfering with its operation With this option the LPDT is capable of communicating with properly equipped Personal Computers or other RS 232 capable con trollers Three front panel buttons provide the user with a wide variety of features The LPDT s advanced design allows it to be housed in a small stainless steel enclosure behind the sensor probe thus the instrument and sensor are a...

Страница 9: ...LPDT User s Manual page 2 ...

Страница 10: ...adation of the desiccant Do not throw away the sensor container you may use it again to transport the sensor between locations to store it between uses or to ship it back to the factory for certi fication The container can be attached to the loop cable by trapping the cable with the lid strap Do not expose the sensor to corrosive gases such as gases containing chlorine ammonia or HCl SO2 can be mo...

Страница 11: ... s Storage temperature 40 F to 176 F 40 C to 80 C Mechanical encapsulated in 100µ sintered stainless steel Calibration method SpanCheck sensor saturates at dewpoint above 68 F 20 C NIST NPL traceable multi point factory calibration available optionally 2 3 Sensor Installation Sampling Techniques Keep in mind that the moisture content at the sensor is not only due to the moisture of the gas being m...

Страница 12: ...aterials 2 3 1 In situ Installation In situ installation is recommended only for measurements where the gas pressure is expected to vary little the gas is expected to be free of contaminants the gas temperature is within the operating specifications of the sensor and there is no chance of liquids coalescing Examples of applications suited for in situ installations are pure gases output of des icca...

Страница 13: ...pplications Also consider the need to isolate depres surize before installing or removing the sensor Main Gas Line LPDT LPDT 4 20mA loop cable Safety shut off Valve Bypass Control Valve Safety shut off Valve Bypass Installation Sensor Measuring at Line Pressure In Line Installation Sensor Measuring at Line Pressure Main Gas Line 4 20mA loop cable oint Transmitter Ma Se Mo Think Safety Read Manual ...

Страница 14: ...re information If the resources to make your own sample system are avail able the following two diagrams may be used as a guideline to configure a simple system LPDT 4 20mA loop cable Exhaust Regulator or Needle Valve Safety shut off Valve Extractive Installation Sensor Measuring at Line Pressure LPDT 4 20mA loop cable Exhaust Regulator or Needle Valve Extractive Installation Sensor Measuring at A...

Страница 15: ... Please make sure that The sample is taken from the upper surface of the main gas line This avoids problems with contamination The sample should be taken away from pipe line walls where flow rates may be low and dewpoint changes may lag For dewpoints dryer than 40 F use stainless steel tub ing only Copper tubing is acceptable for dewpoints wet ter than 40 F Do not use plastic rubber or tygon tubin...

Страница 16: ...er materials only If pressure regulators shut off valves etc are used upstream of the sensor make sure these do not contain rubber or other hygroscopic materials 2 4 Troubleshooting unexpected readings If erroneous readings are suspected on a newly acquired instrument compare the serial number engraved on the sen sor sintered filter to the one stored in the instrument mem ory The two should be the...

Страница 17: ...m 2 Flow rate too low 3 Sample pipe too large and or too long 4 Unsuitable sample pipe material 5 Leaks 6 Hygroscopic materials in sample system Dry Reading SpanCheck wrongly set or faulty sensor Wet Reading Leak in system or use of unsuitable pipe Comparison of readings with manual cooled mirror instrument Display Shows 6 7 Prolonged exposure to wet gas Display Shows 6 5 1 Instrument Failure 2 Sh...

Страница 18: ...This type of indicator reads about 10 C dry at about 50 C dewpoint due to tempera ture gradients within the device The error increases at drier levels Display Shows 6 7 Dry the sensor install sensor in either a known dry gas stream i e instrument quality air or dry nitrogen or place sensor in a dry can or bottle of desiccant and seal the con tainer from outside air the shipping container is design...

Страница 19: ...LPDT User s Manual page 12 ...

Страница 20: ...Electromagnetic Compatibility Considerations The LPDT has been designed and verified by testing to meet the requirements of the EC Council EMC Directive 89 336 EEC for Industrial Scientific Medical equip ment The sensor ground LPDT housing is isolated from the 4 20mA loop however they are also shunted with a 2000pF capacitor and a 33V Transient Voltage Suppressor this prevents electrostatic buildu...

Страница 21: ...tainer Cable Two conductor cable 12 4m provided Power Requirements 10 to 33 VDC polarity independent the instrument draws 4 20mA depending on measured dewpoint Input resolution 0 1 C dewpoint Indicators 3 5 digit LCD with custom legends Engineering units C F PPM LBS H2O mm scf gm H2O M3 Controls 3 push buttons user s selections are stored in EEPROM Outputs Analog and digital outputs are available ...

Страница 22: ...to provide an appropriate sample cavity mounting If the x16 thread is used then the LPDT will seal against the wall of the sample cell with the provided Viton A O ring If the 14mm x 1 25 spark plug thread is used then an addi tional Viton gasket must be installed to provide the proper seal Ask your representative for this gasket it is available free of charge The LPDT is light enough such that eit...

Страница 23: ...d cable The provided cable is terminated with a connector which has a retainer the retainer may be used to secure the connector to the LPDT thus avoiding accidental disconnection The LPDT will draw 4mA to 20mA from the power supply depending on the dewpoint being measured The dewpoints corresponding to 4mA and to 20mA are user selectable in between the current will vary linearly to the selected en...

Страница 24: ...s the user to select operating variables of the instrument To accommodate a variety of installation possibilities the LPDT front panel may be rotated 360 by gently pressing down on the spring loaded face plate and turning it to the desired position 3 4 2 Display Conventions 1 To display characters with the 7 segment numeric dis play the following pseudo alphanumerics are used Numbers 0 12 3 4 5 6 ...

Страница 25: ... show 51 out of ranGe if the num ber to be displayed is larger than 1 999 000 Twelve examples follow for each the number and units desired to be displayed are shown in italics depicted immedi ately below them is the resultant 3 digit LCD display C DEWPOINT F DEWPOINT x10 3 PPM DEWPOINT LBS DEWPOINT DEWPOINT G M3 20 C 100 C 68 F 148 F 23 612 ppmV 0 013 849 ppmV 2 000 000 0 000 000 1 1104 2 lbs H 2 ...

Страница 26: ...e for accelerated incrementing or decrementing of numeric values 3 4 4 Operating State Upon power up the unit performs certain initialization tests see table in section 3 5 and enters the Operating State in the Viewing Dewpoint mode Depressing the MODE but ton will change modes see appendix A in the following order nViewing Dewpoint oViewing Temperature pStart Calibration qViewing Serial Number ba...

Страница 27: ...ing to data derived by IGT Research Bulletin 8 tak ing into account sensor pressure Note that the analog output is linear to the selected engi neering units therefore be mindful that while scrolling through various units the analog output may change even though the measured dewpoint is stable The PSI legend flashes at the bottom of the display when there is pressure correction in the computation o...

Страница 28: ...n is not damaging to the sensor it will prolong the initial dry down time after you install the sensor in the sample stream Therefore remove the sensor from the packaging container only after you are ready to proceed with the calibration procedure and install the sensor in the sample stream immediately after the calibration procedure is completed If you are not ready to use the sensor right away a...

Страница 29: ...he sensor is saturating Make sure you keep the sensor exposed to in hand micro climate until the display shows 1 6 After 60 seconds the display will flash the selected sen sor type see Selecting a sensor type 3 4 5 2 and then the instrument will calculate the slope and offset of the sensor curve while displaying the calculations and then will display 1 for a few seconds after which the instrument ...

Страница 30: ...for this pur pose After a minimum dry out period of 24 hours proceed with the calibration procedure of your choice SpanCheck calibrates sensors by using micro climates Please contact your representative if you have any questions about how to create such micro climates A perfectly acceptable and accurate for calibration micro climate may be created for the XTR100 and XTR65 sensors by cupping the se...

Страница 31: ...mber If the number is larger than 1999 then it is displayed in 2 parts first part is the thousands signified by the x103 legend in the upper right corner of the display and the second part is the units For example serial number 12345 will be shown as Pressing the UP and DOWN buttons simultaneously resets the instrument this is useful for restarting in the set up state by holding the MODE button in...

Страница 32: ...s can be made only to an unlocked instrument the changes are stored when the MODE button is pressed and retained even if the unit is turned off 1 Display of alternate units In this mode a second engi neering unit can be chosen to be displayed alternating with the engineering unit selected in the operating state for example a dewpoint can be displayed alternating with the sample temperature or dewp...

Страница 33: ...that a moisture calibration lab is available The calibration must be done in the range of 25 C to 20 C attempting to calibrate outside this range may cause inaccuracies the dewpoint must be kept stable during calibration and it must be measured accurately by a reference instrument such as a chilled mirror One must also note the state of pressure compensation and turn it on or off as applicable to ...

Страница 34: ...alue should be supplied with the sensor to enter it into the instrument a Go to the mode and press the UP button the display will show the current value in the range of 1 99 to 1 99 followed by blinking horizontal lines ignore the alternately displayed dewpoint b Use the UP or DOWN buttons to modify the cal adjust value as necessary c Press the MODE button to go to the next mode this will save the...

Страница 35: ... Display Units mode Pressing and holding either the UP or DOWN button will save the lock or unlock setting depending on the button and reset the instrument This feature is useful if it is difficult to power off the instrument Note It is imperative that one returns the instrument to the locked mode to avoid unauthorized changes 3 5 Troubleshooting the Instrument This instrument performs diagnostic ...

Страница 36: ...e has been exceeded temperature of 10 C to 70 C 231 Sensor circuit is open dewpoint display tests see table in 6 7 Sensor is saturated sensor troubleshooting 6 5 Sensor circuit is shorted section Trying to calculate dewpoint for undefined sensor select sensor and SpanCheck Trying to calibrate an undefined sensor Calibration tests see Calibration instructions 6 1 2 Sensor reading is too low to be a...

Страница 37: ...strument is subjected to voltages exceeding the specifica tions Under these circumstances the unit display will be blank and the instrument will not draw any current when powered up The fuse is not user replaceable therefore the LPDT must be sent to your representative for servicing ...

Страница 38: ...elect units SET XENTAUR LPDT numbers calculating calibration SET XENTAUR LPDT SEN 2LO SET XENTAUR LPDT AC _AC SET XENTAUR LPDT CNF AC XENTAUR LPDT CAN Confirm SpanCheck LEGEND 1 Arrows leading out from below a button depict the flow as a result of pressing the button 2 Arrows leading out of other locations depict flow as a result of completing a function or a time out 3 A slash in the display area...

Страница 39: ...hese parameters are set properly at the factory to correspond to the shipped sensor Do not modify them unless you are replacing the sensor Power Up with MODE key pressed LOC appears when changing settings of a locked instrument SET AL T DSP SET SEN XT1 DB SET CAL ADJ A 0 TST LO BAT A O RNG 0 01dB 0 1 C 0 01 units XT1 XT6 DB XTR 100 XTR 65 attenuation Factory default is blank there is no alternate ...

Страница 40: ...log Output Set dewpoint corresponding to low end of analog output Set dewpoint corresponding to high end of analog output Lock or unlock the instrument Test Current Loop Voltage OK Too Low 20mA 4mA Unlock Lock Prolonged press of either button will reset the unit When locked instrument parameters can not be changed Factory default is locked CAL ADJ HILO A 0 TST LO BAT A O RNG A O RNG SET UN LOC 0 1...

Страница 41: ...Manual www xentaur com SET HILO TEMP DEWPOINT PSI G M LBS x10 PPM C F XENTAUR LPDT 14mm x 12 5mm 3 4 16 Viton A O ring 2 230 1 850 0 600 Power Jack screw on retainer DC Power Jack Removable Sensor encapsulated in 100 m sintered stainless steel unscrew to remove 5 16 24 tension washer f r o n t p a n e l r o t a t e s f r e e l y 3 6 0 ...

Страница 42: ...W Relay Option Board Provides two independent Relays with programmable trip point and hysteresis 85 265VAC DC or AC supply Display Buttons Relays Voltage or Current Output RS 232 Output Power Supply RS 232C to Computer Multichannel Option Board multiple units connected on the same two wires Methods of Using and Interfacing the LPDT maintain 10 33VDC here oint Transmitter Ma Se Mo Think Safety Read...

Страница 43: ...or the same reason the extremely large dielectric constant of the water molecule any capacitance variations arising from the Alu minum Oxide such as changes due to temperature are insignificant in relation to the capacitance due to the water content Thus the sensor capacitance varies greatly in pro portion to the water content in the surrounding gas The sen sor is designed such that the relationsh...

Страница 44: ...the capacitance at the wet end of the curve As discussed previously the capacitance at the wet end approaches asymptotically a saturated pore capacitance therefore if the sensor is saturated the exact water content will not be important since the curve is asymptotic then the instrument can measure the capacitance and re calibrate the sensor This is refered to as SpanCheck The advantages of this un...

Страница 45: ...LPDT User s Manual page 38 ...

Страница 46: ...C and F are affected by pressure correction by reporting what the dewpoint would be at the Gas Pressure when the dew point is what is measured at the pressure at the sensor How ever this also implies that whether pressure correction is applied or not the PPM LBS and G M3 readings are affected by the setting of the sensor pressure The factory default settings are 14 7psi for both sensor and gas pre...

Страница 47: ... 3 4 5 7 8 and or appendix B to check and set the Analog Output low and high ranges the factory default settings are 100 C and 20 C respectively For example a unit with factory default settings drawing 12mA is computed to be measuring a dewpoint of 40 C Note that the computation is such that the current is linear to the selected engineering units Hence selecting ppmV or LBS or G M3 units will caus...

Страница 48: ...gh range will be set to 150ppmV which is 38 5 C dew point Now the current loop output will be 4 55 to 14 48 mA in the range of 10 to 100 ppmV the 10mA variation is more than sufficient for a good measurement by the user s equipment One may carry out similar calculations for LBS or G M3 and choose the appropriate settings While making these computations it may be useful to obtain a copy of Xentaur ...

Страница 49: ...eading in LBS of H2O million cubic feet 10 100 1000 10000 4 1mA 5mA 0 1 1 10 100 1000 12mA 8mA 20mA 4 5mA 4 20 mA output 0 56 LBS 60 C 10 66 ppmV 1 97 LBS 50 C 38 83 ppmV 49 3 LBS 20 C 1019 3 ppmV 289 1 LBS 0 C 6063 8 ppmV L o w A O r a n g e 1 0 0 C H i g h A O r a n g e 2 0 C L o w A O r a n g e 6 5 5 C H i g h A O r a n g e 3 8 5 C ...

Страница 50: ...asurment accuracy Calculated ppmV Calculated LBS H 2 O mmscf 80 75 70 65 60 55 50 45 40 35 30 25 20 0 5 0 5 0 25 2 5 0 05 0 6 0 7 0 8 0 9 1 1 0 1 2 3 4 5 5 6 7 8 9 10 10 20 30 40 48 38 34 29 24 19 15 44 50 60 70 80 90 100 200 300 400 500 600 700 800 900 1000 Measured Dewpoint C D e w p o i n t 3 C D e w p o i n t 3 C ...

Страница 51: ...5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 65 of step change 95 of step change Response Time of Xentaur Al 2 O 3 Sensors to a Step change DOWN from 39 4 C dp at time 0 to 62 2 C dp after 48hrs of equilibrium ...

Страница 52: ...______________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ Process material s and or environments including radiation to which the equipment has been exposed ______________________________________...

Страница 53: ...LPDT User s Manual page 46 ...

Страница 54: ...Xentaur Corporation 3661 Horseblock Road Medford NY 11763 USA Tel 516 345 3434 ...

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