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Xentaur XDT User Manual

Other manuals for XDT: User Manual
Manual is about: Xentaur Dewpoint Transmitter User's manual

Summary of XDT

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    Xdt user’s manual i when calling your representative for technical support, please have your serial numbers available. The sensor and instrument serial numbers are on the instrument, also see section 3.4.4.4. Sensor serial no.: _______________ instrument serial no.: _______________ your representati...

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    Xdt user’s manual ii xentaur reserves the right to change or modify the product specification and / or appearance at any time without notice. Therefore, the information in this document is subject to change without notice and does not represent a commitment on the part of xentaur corporation. The cu...

  • Page 4: Warning Labels

    Xdt user’s manual iii examine the xdt package for damage or mishandling. If any damage is evident notify the carrier and request an inspection. Unpack the box, it should contain: the xdt, sensor in desiccant container, connec- torized cable, and this manual. Please read this manual in whole, prior t...

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    Xdt user’s manual iv warranty this instrument is warranted to be free from defects in workmanship and materials. Liability under this warranty is limited to servicing, calibrating, and replacing any defective parts of the instrument returned to the factory for that purpose. Fuses are specifically ex...

  • Page 6: Table Of Contents

    Xdt user’s manual v table of contents 1.0 overview of the dewpoint transmitter model (dt) ...........................................................1 2. Sensor and sampling techniques ..........................................................................................3 2.1 precautions using t...

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    Xdt user’s manual vi appendix d: optional sensor fittings.....................................................................................41 appendix e: dt circuit board dimensions............................................................................42 appendix f: sensor/spancheck™ theory ...

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    Section 1: introduction 1 1.0 overview of the xdt the xdt is a microprocessor based hygrometer, for measuring moisture content in gases in the range from -100°c to +20°c dewpoint depending on the sensor ordered. The xdt uses the xen- taur hyper thin film htf™ sensor which is encapsulated in sintered...

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    Xdt user’s manual 2.

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    Section 2: sensor and sampling techniques 3 2. Sensor and sampling techniques 2.1 precautions using the sensor the xentaur htf™ al 2 o 3 sensor is designed and field proven to be highly reliable, rugged and maintenance free. However the user should consider the following precautions: • if the instru...

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    Xdt user’s manual 4 2.2 sensor technical specifications type: ..................................Hyper thin film htf™ high capacitance al 2 o 3 . Dewpoint range:.................Xtr-100: -148°f to +68°f (-100°c to +20°c) xtr-65: -85°f to +68°f (-65°c to +20°c). Capacitance:.......................15nf...

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    Section 2: sensor and sampling techniques 5 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 operat- ing specifications of the sens...

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    Xdt user’s manual 6 2.3.2 extractive installation for extractive installations we recommend our sample system 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, pressu...

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    Section 2: sensor and sampling techniques 7 inside these materials. • try to run pipes to the sensor upwards, so that contaminants tend to fall back into the main line. • keep the length of the sample line to the sensor as short as possible. • use small diameter pipes (1/4” or 1/8” od). • use suffic...

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    Xdt user’s manual 8 2.5 troubleshooting unexpected readings if erroneous readings are suspected on a newly acquired instrument, compare the serial number engraved on the sensor sintered filter, to the label on the instrument. The two should be the same; if they are not, the instrument may not be cal...

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    Section 3: instrument 9 3. Instrument 3.1 precautions using the xdt the xdt uses state-of-the-art microelectronics to provide a compact full functioning instrument. The user should consider the following precautions when using any sensitive electronic device. • observe the appropriate electrical saf...

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    Xdt user’s manual 10 3.2 instrument technical specifications enclosure: .........................Xdt-oem bare board xdt-nema tabletop or surface mount, watertight ip65 tested, and nema 12 tested xdt-pm panel-mount, din 43700 dimensional standard, optional nema 12 type protection gasketing available ...

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    Section 3: instrument 11 3.3 installation 3.3.1 instrument mechanical installation the xdt is available in several different physical configurations. Please follow the instructions below, which describe the instrument being installed. The sensor installation is discussed in sec- tion 2: sensor and s...

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    Xdt user’s manual 12 3.3.2 electrical connections all connections are made via a 21 contact, pluggable screw terminal block referred to as p1. Cable access to the xdt-nema enclosure is through three ports (refer to appendix e), which maintain the nema integrity: • one 1/2” npt conduit fitting, may b...

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    Section 3: instrument 13 fast acting fuse. Please follow the appropriate installation procedures in the paragraphs below according to the electrical power option on your instrument. Do not connect to ac power without a proper ground connection. For intrinsically safe installations, first make sure t...

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    Xdt user’s manual 14 dent relays corresponding to the hi and lo alarms. The relay contacts are rated at 10a 250vac or 30vdc, instruments for use in division 2 hazardous areas have hermetically sealed relays rated at 3a 125vac. Use wiring appropriate for the voltage and current that will be switched ...

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    Section 3: instrument 15 3.3.2.5 interfacing to the rs-232 option the optional rs-232c interface is provided on the p1 connector. The configuration is 9600 baud, even parity, 8 bits, 1 stop, all received characters are echoed. The ground of the rs-232c inter- face is connected to the frame (ac power...

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    Xdt user’s manual 16 3.4.2 display conventions 1. To display characters with the 7 segment numeric display, the following pseudo-alphanumer- ics are used: numbers: 0 12 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 letters: abcdef gh ij lnop qrs tuxyz a b c d e f g h i j l n o p q r s t u x y z symbols: ? - . ?...

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    Section 3: instrument 17 switches described above. • with a front face plate which has labeled holes placed immediately above the circuit board switches, thus the operator may push the switches without removing the face plate, by making use of a probe such as a paper clip. • with a front plate conta...

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    Xdt user’s manual 18 parts per million by volume computed at the sensor pressure (more about pressure later). The lbs and g/m 3 are density measurements, pounds of water per million standard cubic feet and grams of water per standard cubic meters, respectively, both in natural gas, they are computed...

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    Section 3: instrument 19 3.4.4.2 alarms there are two independent optional alarms, they are named hi and lo alarms. Each alarm can activate a single pole double throw relay rated at 10a 250vac or 30vdc per contact. Instru- ments for use in division 2 hazardous areas have hermetically sealed relays r...

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    Xdt user’s manual 20 5. Push the mode button. The display will show: the ‘dewpoint’ indicator means that we are changing the alarm trigger dewpoint 6. Push the up or down buttons until the display shows: 7. Push the mode button. The display will show: the z indicates that we are changing the hystere...

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    Section 3: instrument 21 3.4.4.3.1 spancheck™ mode the instrument is calibrated at the factory with the sensor it is shipped with and does not need to be re-calibrated prior to installation. Instrument calibration is recommended in approximately 12 month intervals, and the xtr65w sensor should be re...

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    Xdt user’s manual 22 the instrument will retain the calibration even if the power is turned off. Under certain conditions, an over (super) saturated sensor may need to be completely dried out before a calibration is performed. Symptoms of these conditions are a sensor that will not go through the sp...

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    Section 3: instrument 23 point the waiting time may have to be increased - specially if the sensor was wet before the procedure is initiated. Consult with your representative to determine sufficient waiting time for your application. • make sure the instrument is unlocked. • press the mode button a ...

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    Xdt user’s manual 24 dewpoint legends will also appear. Use the up and down buttons to modify this dew- point to match the dewpoint of the reference gas. • press the mode button, the display will alternately show 720 / hrs / intr, indicating that the calibrations are scheduled at 720 hours interval....

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    Section 3: instrument 25 • the instrument will display the measurement using the newly acquired calibration values. The instrument computes the dewpoint from the measured capacitance of the sensor. The sequence of computations is as follows: • the capacitance is converted to percent of full scale (-...

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    Xdt user’s manual 26 caution: 2), 3), 4) and 5) are set at the factory and need only be modified when a sensor is changed. 2. Selecting the sensor type: in this mode the user can select the software matching the type of sensor installed in the instrument: xt1 : xtr-100 (-100°c to +20°c); xt6 : xtr-6...

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    Section 3: instrument 27 a. Go to the cal/adj 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 dis- played dewpoint. B. Use the up or down buttons to modify the cal-adjust value as nece...

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    Xdt user’s manual 28 ber can be corrected by reversing the use of the up and down keys), with the “12” flashing. Pressing the “mode” button will flash the next “0”. Pressing the “up” button three times will display “1230”. Pressing the “mode” button will flash the last “0”. Pressing the “up” button ...

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    Section 3: instrument 29 • this configuration is also equipped with a nema sealed audio indicator (>80db @ 3ft) mounted in the instrument enclosure. It is activated when an alarm condition occurs, it may be disabled by momentarily pressing the reset button on the front panel. When the alarm con- dit...

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    Xdt user’s manual 30 legend: denotes a beeping accompaniment to the message. / denotes alternately flashing messages. Display explanation required action lo err prom check sum failed. Power on tes ts hi err ram write/read test failed. Cycle power % err unidentified power-up failure. If problem persi...

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    Section 3: instrument 31 3.7 maintenance the xdt-pm and xdt-nema instrument enclosures may be cleaned when necessary using a damp (moist) cloth.The xdt-oem bare circuit board may be cleaned by blowing air across the circuit board. The sensor should not be cleaned as it may be damaged. Spare parts ma...

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    Xdt user’s manual 32.

  • Page 40: Glossary

    Glossary 33 glossary 0/24 ma . . . . . . . . . . . . . . . . Range of current for the current loop (0ma=minimum reading, 24ma=maximum reading) 4/20 ma . . . . . . . . . . . . . . . . Range of current for the current loop (4ma=minimum reading, 20ma=maximum reading) - preferred because less than 4ma c...

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    Xdt user’s manual 34 used for the circuit (see 4/20) db . . . . . . . . . . . . . . . . . . . . . See - decibel db25 . . . . . . . . . . . . . . . . . . . A style and size of connector - in this case with 25 pins db9 . . . . . . . . . . . . . . . . . . . . A style and size of connector - in this cas...

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    Glossary 35 impedance . . . . . . . . . . . . . . . The ratio of voltage to current at a specified frequency measured in ohms, a resistor of the same value would act the same as the mea- sured circuit in-hand micro-climate. . . . . . The warm and moist “climate” created when cupping the sensor in on...

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    Xdt user’s manual 36 rg58 . . . . . . . . . . . . . . . . . . . A type of coaxial cable - the letters/numbers refer to the electrical characteristic of the cable (resistance/capacitance per foot of length) rg6 . . . . . . . . . . . . . . . . . . . . A type of coaxial cable - the letters/numbers refe...

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    Xdt user’s manual appendices 37 appendix a: flow diagram of operating state user interface ˚c dewpoint set set hi hi/lo set hi set lo set lo set lo set hi set set set set set set set ˚c dewpoint ˚c ˚c dewpoint ˚c psi psi psi numbers calculating calibration legend: a slash ' ' in the display area, is...

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    Xdt user’s manual appendices 38 flow diagram operating state user interface (continued) manual & scheduled self calibration ˚c dewpoint hi/lo set set set set set set psi numbers calculating calibration legend: a slash ' ' in the display area, is used to depict two alternately shown (flashing back an...

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    Xdt user’s manual appendices 39 appendix b: flow diagram of set-up state user interface hi/lo set set set lo lo lo hi set set set set set set set set set set set set set test analog output by forcing it to high, low or midpoint. (e. G. If span is 4 to 20, hi =20ma, lo=4ma, mid=12ma) set measured att...

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    Xdt user’s manual appendices 40 appendix c: sensor mechanical flats f or 1 " wrench 1 4/ ~1.45" 14mm x 1.25mm 3/4"-16 viton a o-r ing female bnc connector 2.230" 3" min removable sensor encapsulated in 100 sintered stainless steel, unscrew to remove. 5/16"-24 tension washer xe n t a u r hp c -5 0 0 ...

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    Xdt user’s manual appendices 41 appendix d: optional sensor fittings.

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    Xdt user’s manual appendices 42 appendix e: xdt circuit board dimensions low relay hi relay nc no c nc no c caution relay voltage o o gnd gnd 10va 50/60hz 100-250vac j.F.M.A.M.J.J.A.S.O.N.D 2003 2002 2001 2000 s4 s3 s2 s1 r s r p e d o m made in usa xdt (c) 1999 xentaur corp. Ps+ ret rxd txd a.Out a...

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    Xdt user’s manual appendices 43 appendix e (continued): xdt-pm enclosure mounting dimensions standard mounting (with clip-on compression brackets) environmentally sealed mounting (with gasket and clip-on screw clamp mounting brackets).

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    Xdt user’s manual appendices 44 appendix e (continued): xdt-nema enclosure mounting dimensions.

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    Xdt user’s manual appendices 45 appendix f: sensor/spancheck™ theory of operation the sensor is constructed as a capacitor whose dielectric consists of porous aluminum oxide as well as the gas that has entered in the pores of the aluminum oxide. The plates (electrodes) of this capacitor are an alumi...

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    Xdt user’s manual appendices 46 appendix g: dewpoint response time analysis manufacturers of dewpoint sensors will make unbelievable claims of speed. But without support- ing data revealing the conditions under which the measurements were made, such as flow rate, temperature, the dewpoint at which t...

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    Xdt user’s manual appendices 47 of course analyzing on a wet-up step will produce much faster results, because all sensors are fast on wet up, since al 2 o 3 (like most materials) adsorbs faster than it desorbs. Testing with a small step e.G. In the -10°c to 0°c dewpoint range will produce even fast...

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    Xdt user’s manual appendices 48 appendix h: sample gas filter considerations sample treatment with pre-filtering may be a necessity in many instances. However the filter housing and element may affect the dewpoint reading and/or the response time of the system. Below is a graph comparing measurement...

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    Xdt user’s manual appendices 49 appendix i: xdt grounding considerations 1. The sensor ground is isolated from the signal and frame grounds, however it is shunted to frame ground with a 33v transient voltage suppressor,1m ohm resistor and 0.1uf capacitor to prevent electrostatic buildup and noise pi...

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    Xdt user’s manual appendices 50 appendix j: analog output vs. Dewpoint the current output of the xdt, varies with the measured dewpoint. To use the current to calcu- late the value of the dewpoint measurement, one must know the settings of the low and high ends of the analog output range, then: wher...

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    Xdt user’s manual appendices 51 -100°c to +20°c settings, because the 4-20ma provides sufficient resolution to measure the out- put better than the specified accuracy of the sensor. Relationship of 4-20ma output and instrument reading in ppmv or lbs instrument reading in ppmv instrument reading in l...

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    Xdt user’s manual appendices 52 appendix k: rs-232c interface protocol the instrument uses a simple protocol to communicate to a host computer through its rs-232c interface, see section 3.3.2.5 for electrical connections. The interface is configured as 9600 baud, even parity, 8 bits, 1 stop; and it ...

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    Xdt user’s manual appendices 53 the mode argument is optional and may be specified only if an interval was specified. It may be “n” for numeric reporting or “g” for graphic reporting of the measurement. The mode argument defaults to numeric mode. The graphic mode may be chosen only for °c or °f, it ...

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    Xdt user’s manual appendices 54 the printer should have at least 80 character columns, and it is best to use continuous form paper. “?” command requests a single report of the measurement in the currently selected format. Send:? C r the unit will respond in the format selected with the data command,...

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    Xdt user’s manual appendices 55 appendix l: procedure for exchanging xdt sensors to exchange sensors one must know the measured low attenuation of the sensor at some low dew- point as well as the calibration adjustment value. These numbers can be found on the shipping container serial number label. ...

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    Xdt user’s manual appendices 56 appendix m: uncertainty in lbs & ppmv calculations uncertainty of lbs & ppmv calculations due to +/-3 ° c measurement 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....

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    Appendix m: return authorization number request form xentaur return authorization number request form • xentaur must approve and assign a return authorization number (ran) to any instrument being returned. • the ran must appear on all paperwork and packaging. • the issuance of a ran does not automat...

  • Page 66: Index

    57 symbols °c .........................................................17 °f ..........................................................17 a ac power voltage ................................10 accuracy °c,°f specification .............................4 calculated lbs or ppmv ....................56 ad...

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    Index 58 copper tubing .........................................6 copyright .................................................I corrosive gases .................................3, 20 csa ......................................................13 cul ........................................................

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    59 index npl ........................................................1 o oil ...........................................................3 operating state ......................................17 operating state flow diagram ................37 optionally ordered features/capabilities .1 outdoor insta...

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    Index 60 voltage, mains supply ..........................10 w warning labels ...................................... Iii warranty ................................................Iv water .......................................................3 weather proofing ....................................9 we...

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    Xentaur corporation, 84f horseblock road, yaphank, ny 11980 u.S.A. Tel (631) 345-3434 fax (631) 345-5349.