Epson XDT manuale d’uso

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XDT User’s Manual i When calli ng your r epr esen tative f or technic al support, p lease have your serial number s availabl e. The Sensor a nd Instrume nt Serial Numbers ar e on th e inst rument, also s ee secti on 3.4.4.4. Sensor Ser ial No.: _ _____________ _ Instrument Serial No.: _ _________ _____ Y our R epre sen tative is: Except as may be[...]

XDT User’s Manual ii Xentaur reserves the ri ght to change or modify t he product specificati on and / or appearance at an y time without notice. The refore, the infor m ation i n this do cument is s ubject to change without not ice a nd does not re pre sent a comm i tmen t on th e pa rt of Xe nta ur Co rpora tion. The custo m er agr ees that in [...]

XDT User’s Manual iii Examine the XDT package for dam age or mishandling . If any damage is evident notify the carrier and request an inspection. Unpack the box, it shoul d contain: Th e XDT, sens or in desiccant cont ainer , connec- torized cable, and this manual. PLEASE READ THIS MA NUAL IN WHOLE, PRIOR T O INST ALLING OR REMOVING THE SE NSOR F[...]

XDT User’s Manual iv Wa r r a n t y This ins trument is warrant ed to be free fr om defects in workmanship and mat erials. Liabil ity under this warra nty is limi ted to serv icin g, cal ibrat ing , and re pla cing a ny de fecti ve p arts o f the in str ument return ed to the fa ctor y for t hat pu rpo s e. Fu ses ar e sp ecific all y excl uded f[...]

XDT User’s Manual v T abl e of Conten ts 1.0 Overview of the Dewpoint Transmitter model (DT) ...........................................................1 2. Sensor and Sampling Techniques ....................................................................................... ... 3 2.1 Precautions using the sensor ............... .................[...]

XDT User’s Manual vi Appendix D: Optional Sensor Fitti ngs ...... ...............................................................................41 Appendix E: DT Circuit Board Dimensions ............................................................................42 Appendix F: Sensor/SpanCheck™ Theory of Operation .............................[...]

Section 1: Intr odu ctio n 1 1.0 Overvi ew of the XDT The XDT is a microprocessor based hygrome ter , for measuring moisture content in gases in the range from -100°C to +20°C dewpoint depending on the sensor ordered. The XDT use s the Xen- taur Hyper Thin Film HTF™ sen sor which is encapsulated in s intered stainless st eel, thus it is capable[...]

XDT User’s Manual 2[...]

Section 2: Sensor an d Sampling Techniqu es 3 2. Sensor and Sampl ing T echniques 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 instrument is used to measure moisture in t oxic[...]

XDT User’s Manual 4 2.2 Sensor T echnical Specifications T ype : .......... .................. ...... Hyper T hin Film HTF™ hig h capacitance Al 2 O 3 . Dewpoin t range:............... .. XTR-100: -148°F to +68 °F (-100°C t o +20°C) XTR-65: -85°F to +6 8°F (-65° C to +20°C ) . Capacit an c e: ............. .... ...... 15nF to 200n F . A[...]

Section 2: Sensor an d Sampling Techniqu es 5 2.3.1 In-situ Installation In-situ installation is recommended only for measurements where the gas pr essure is expected to vary little, t he ga s is expe cted to be free of conta mina nts, t he gas te mperature is within t he operat- ing specifications of the sensor , and there is no chance of liquids [...]

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 fe atures, such as: isolation valve, co alescing or particulate filter , pressure re gulator , calibration sample injection or extraction port, pres sure gauge, flow meter , weather proof enclo[...]

Section 2: Sensor an d Sampling Techniqu es 7 inside thes e materials. • T ry 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 suf ficient flow rates (e.g. 1 l/min wit[...]

XDT User’s Manual 8 2.5 T roubleshooting unexpected readings If erroneous readings ar e suspected on a newly acquired instrument, compare the ser ial 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 calibrated with the installed sensor . T o trou[...]

Section 3: Instru ment 9 3. In strument 3.1 Precautions using the XDT The XDT uses state-of-the-a rt microelectronics to provide a compact full f unctioning instrument. The user should consider the following precautions when using any sensitive electronic device. • Observe the appropriate electrical safety codes and regulations. Consult with Nati[...]

XDT User’s Manual 10 3.2 Instrument T echnical Specifications Enclo sure: ......... ....... ......... XDT -OEM bare bo ard XDT -NE MA tabl et op or surface moun t, watertight IP65 te st ed, and NEMA 12 te ste d XDT - PM panel- mount, DIN 43700 dimensio nal stan dard, op tional NE MA 12 t ype prot ection gas keting availa ble Dimens ions & W e[...]

Section 3: Instru ment 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 descr ibe the instrument being installed. The sensor inst allation is discussed in Sec- tion 2: Sensor and Sampling T echniques. 3.3.1.1 XDT -PM (DIN43700[...]

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 (r efer to appendix E), which maintain the NEMA int e grity: • One 1/2” NP T conduit fitting, may be used for high or low voltage connect [...]

Section 3: Instru ment 13 fast acting fuse. Please follow the appropriate installation proce dures in the paragraphs below according to the electrical power option on your instrument. Do not co nnect to AC powe r without a proper ground connection. For Intrins ically Safe installa tions, firs t make sure that the equipmen t is qualified for the par[...]

XDT User’s Manual 14 dent relays corresponding to the HI and LO alarms. The re lay contacts are rated at 10A 250V AC or 30VDC, instruments for use in division 2 Hazardous Areas have hermet ically sealed relays rated at 3A 125V AC. Use wiring appropriate f or the voltage and current that will be switched by the relays. Also see section 1.3 for EMI[...]

Section 3: Instru ment 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 ) ground however it is isolated from the senso[...]

XDT User’s Manual 16 3.4.2 Display Conventions 1. T o display character s with the 7 segment numeric display , the following pseudo-alphanumer- ics are used: Numbers: 0 1 23456789 0123 4567 8 9 Letters: AB CDE F G H I J L NO P Q R S T UXYZ ABC DE F GH I JL NOPQRSTUXYZ Symbols: ?- . ?- . 2. The instru ment will indicat e whether a parti cular mode[...]

Section 3: Instru ment 17 switches described above. • W ith a front face plat e which has labeled holes placed immediately above the circuit board switches, thus the operator may push the switches without removing the fac e plate, by making use of a probe such as a pape r clip. • W ith a front plate containing four membrane switches connected t[...]

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 mi llion standard cubic feet and grams of water per standard c ubic meters, respectively , both in Natural Gas, they are computed accord- ing to data derived by IG T Resear c[...]

Section 3: Instru ment 19 3.4.4.2 Alarms There are two independent optional alar ms, they are named HI and LO alarms. Each ala rm can activate a single pole double throw relay rated at 10A 250V AC or 30VDC per contact. Instru- ments for use in Division 2 Hazardous Areas have hermetically sea led relays rated at 3A 125V AC. Specially ordered instrum[...]

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 butto ns until the dis play shows: 7. Push the MODE button. The display will show: the Z indicates that we are changing the hysteresis of the alarm. 8. Push the UP or DOWN[...]

Section 3: Instru ment 21 3.4.4.3.1 SpanCheck ™ Mode The instrument is calibrated a t the factory with the sensor it is shipped with and does not need to be r e-calibrated prior to installation. Instrument calibration is recommended in approximately 12 month intervals, and the XTR65W sensor should be re-calibrated after prolonged exposure to liqu[...]

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 nee d to be completely dried out before a calibra tion is performed. Symptoms of t hese conditions are a sensor that will not go through the SpanCheck™ function to the END display , or a[...]

Section 3: Instru ment 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 tim e for your application. • Make sure the instrument is unlocked. • Press t he MODE button a few t imes until the di splay shows CAL . ?[...]

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 t he MODE button, the di splay will alternate ly show 720 / HRS / INTR , indi cating that the calibrations are scheduled at 720 hours interval. Use the UP and DOWN buttons to change t[...]

Section 3: Instru ment 25 • The instrument will display the measurement using the newly acquired calibration values. The instrument computes the dewpoint from the measured capaci tance of the sensor . The sequence of computations is as follows: • The capacitance is converted to percent of full scale (-100°C to +20°C dp), using the low dB, low[...]

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 install ed in the instrume nt: XT1 : XTR-100 (-100°C to +20°C); XT6 : XTR-65 (-65°C to +20°C); DB : show impedance o[...]

Section 3: Instru ment 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 li nes, ignore the alternately dis- played 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 ne[...]

XDT User’s Manual 28 ber can be corrected by re versing the use of the UP and DOWN keys), with the “ 12 ” flas hing. Pressing the “MODE” button will flash the next “ 0 ”. Pressi ng the “UP” butto n three times will display “ 1230 ”. Pressing the “MODE” button will flash the last “ 0 ”. Pressing the “UP” button four[...]

Section 3: Instru ment 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 t he front panel. When the alarm con- dition ceases to exist, the audio indicator is[...]

XDT User’s Manual 30 Legen d:  denotes a beeping ac companiment to the messag e. / denotes altern ately flash i ng messages. DISPLA Y EXPLANA TION REQUIRED ACTION LO ERR  PROM check sum fai led. power on tests HI ERR  RAM write/read te st failed. cycle power % ERR  Unidentified powe r-up failure . if problem pers ist s, C.S.F/  EEP[...]

Section 3: Instru ment 31 3.7 Maintenance The XDT - PM and XDT -NEMA instrument enclosure s may be cleaned when necessary using a damp (moist) cloth.The XDT -OEM ba re circuit board may be cleaned by blowing air ac ross the circuit board. The sensor should not be cleaned as it may be damaged. Spare parts may be ordered through your r epresentative.[...]

XDT User’s Manual 32[...]

Glossary 33 Glossary 0/24 mA . . . . . . . . . . . . . . . . range of current for the curr ent loop (0mA=minimum reading, 24mA=maximum reading) 4/20 mA . . . . . . . . . . . . . . . . range of current for the curr ent loop (4mA=minimum reading, 20mA=maximum reading) - preferre d because less than 4mA can indicate a fault or open circuit, also there[...]

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 case with 9 pins decibel . . . . . . . . . . . . . [...]

Glossary 35 impedance . . . . . . . . . . . . . . . the ratio of voltage to curre nt at a specified frequency meas ured 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 w hen cupping the sensor in ones hand. in-situ . . . . . . . . . . . . .[...]

XDT User’s Manual 36 RG58 . . . . . . . . . . . . . . . . . . . a type of coaxial cable - the le tters/numbers refer to the electrical characte ristic of t he cable (re sistance/ca pacitance per foot of length) RG6 . . . . . . . . . . . . . . . . . . . . A type of coaxial cable - the letter s/numbers refer to the electrical characte ristic of t h[...]

XDT User’s Manual Appendices 37 Appe ndix A: F low Diagram of O pe rating S tate User Inte rface ˚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 used to depict two alterna[...]

XDT User’s Manual Appendices 38 Flow Diagram Operating State User Interface (continued) Manual & Scheduled Se lf 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 and forth) messages. denotes beep[...]

XDT User’s Manual Appendices 39 Append ix B: Flow Diag ram of S et -Up S tat e U ser 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 attenuation at a known low dewpoint Set low [...]

XDT User’s Manual Appendices 40 Appen dix C: Se nsor Mechanic al flats f or 1 " wrench 1 4 / ~1.45" 14mm x 1.25mm 3/4"-16 Viton A O-ring female BNC connector 2.230" 3" min Removable Sensor encapsulated in 100 sintered stainless steel, unscrew to remove. 5/16"-24 tension washer X E N T A U R H P C - 5 0 0 P LISTED 76N[...]

XDT User’s Manual Appendices 41 Append ix D: Option al Sen sor Fi tting s[...]

XDT User’s Manual Appendices 42 Append ix E: XDT Circuit Bo ard D imension s 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.RET SIGNAL-RET SIGNAL-IN ACH ACN DEWPOINT T[...]

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)[...]

XDT User’s Manual Appendices 44 Appendix E (continued): XDT -NEMA Enc losure Mounting Dimensions[...]

XDT User’s Manual Appendices 45 Append ix F: Senso r/S panCheck™ Th eory of Oper ation The Sensor is constructed as a capacitor whose dielectr ic 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 aluminum substrate and a porous gold layer de[...]

XDT User’s Manual Appendices 46 Appendix G : Dewpoint Response time An alysis 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 the test was performed, and most importantly t[...]

XDT User’s Manual Appendices 47 Of course analyzing on a wet-up step will produce much faster results, because all sensors are f ast on wet up, since Al 2 O 3 (like most material s) adsorbs faster than it desorbs. T esting with a small step e.g. in the -10°C to 0°C dew point range will produce even faster results, and all ow manufac- turers to [...]

XDT User’s Manual Appendices 48 Appendix H: Sa mple Ga s Filter C onsideratio ns Sample treatment with pre-filtering may be a nece ssity 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 measurements from the same calibrated sensor with and [...]

XDT User’s Manual Appendices 49 Append ix 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 T ransient V oltage Suppressor ,1M Ohm resistor and 0.1uF capacitor to prevent electrostatic buildup and noise pickup. When the sensor is connected to e quip[...]

XDT User’s Manual Appendices 50 Appendix J: Analog Outpu t vs. Dewpoint The current output of the XDT, varies with the measured dewpoint. T o 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 e: I = curren t supplied by XDT analog out pu[...]

XDT User’s Manual Appendices 51 -100°C to +20°C settings, because the 4-20mA provides sufficient resol ution to measure the out- put better than the specified accuracy of the se nsor . Relationship of 4-20mA output and instrument reading in ppmV or LBS Instrument reading in ppmV Instrument reading in LBS of H2O / million cubic feet 10 100 1000 [...]

XDT User’s Manual Appendices 52 Append ix K: RS -232C Inte rface Pr otoco l 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 connec tions. The interface is configured as 9600 baud, Even Parity , 8 Bits, 1 Stop; and it echoes all received characters. T o illus[...]

XDT User’s Manual Appendices 53 The mode argument is opti onal and may be specified only if an interval was spec ified. It may be “N” for numeric repor ting 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 will plot a graph of the measureme[...]

XDT User’s Manual Appendices 54 The printer should have at least 80 character c olumns, and it is best to use conti nuous form paper . “?” command Requests a single report of the measurement in the curre ntly selected format. send: ? C R The unit will respond in t he format selected with the Data command, for example: receive: B L -59.3degC S[...]

XDT User’s Manual Appendices 55 Append ix L : Procedure for E xchang ing XDT Senso rs T o exch ange 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. Through the following steps it is helpfu[...]

XDT User’s Manual Appendices 56 Appe ndix M: Unc ertai n ty in LBS & ppmV calc ul ations 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 0.1 2 3 4 5 5 6 7 8 9 10 10 20 30 4[...]

A ppendix M : Return Author ization Number Request For m Xentaur Return Authoriz ation Number Request Form • Xentaur m ust approve and as sign a Return Auth orization Num ber (RAN) to any instrum ent being returned. • The RAN m ust appear on all paperw ork and packagin g. • The issuance of a RAN does not automatically imply that the in strume[...]

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57 Symbols °C ......... .............. ........... ............... ....... . 17 °F .......... .............. ........... ............... ....... . 17 A AC power vo ltage ......... ............... ... .... . 10 accuracy °C,°F sp ecification .... .................. ....... 4 calculate d lbs or ppm V . ....... ........... . 56 adjusti ng low senso[...]

Index 58 copper tubing ............ ....... ........... ...........6 copyrig h t ........ ....... ........... .............. ........ .i corrosiv e gases ............. .................. .. 3, 20 CSA ..... .............. ........... ............... .........13 cUL ..... .............. ........... ............... ....... ....4 curre nt loop comput a[...]

59 Index NPL .. ....... ........... ............... ........... .......... 1 O oil ..... ............... ........... .............. ........... ... 3 operatin g s tat e ............ ... .... ... ............... . 17 operatin g s tat e flow diag ram ................37 option ally orde red featur es/capabiliti e s . 1 outdoor ins talla ti on ....... [...]

Index 60 volta ge, mains supply ............. ....... ......10 W warning labels .............. .................. ...... iii warrant y ..... ....... ........... ............... ..........iv water .... ....... ........... .............. ........ ...........3 weathe r pro ofing .............. ... ............... ....9 weight .. .................. ...[...]

XENT AUR CORPORA TION, 84F HORSEBLOCK ROAD, Y APHANK, NY 1 1980 U.S.A. TEL (631) 345-3434 F AX (631) 345-5349[...]