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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.
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.
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.
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.
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 .............................................................
XDT User’s Manual vi Appendix D: Optional Sensor Fitti ngs ...... ...............................................................................41 Appendix E: DT Circuit Board Dimensions .............................................................
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.
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.
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 ) .
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.
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 ale.
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).
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 .
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.
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.
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.
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 thre.
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.
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.
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.
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: ?- .
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.
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 .
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.
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.
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.
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.
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.
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.
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 .
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 softwar.
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 .
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 ”.
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.
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.
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.
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 .
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 . . . . . . . . . . . . . . . . .
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.
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 . . . . . . . . . . . . . . . . . .
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 DEWP.
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.
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.
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.
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.
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 c.
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.
XDT User’s Manual Appendices 46 Appendix G : Dewpoint Response time An alysis Manufacturers of dewpoint sensors will make unbelievable claims of speed.
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.
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.
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.
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.
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 .
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.
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.
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.
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.
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.
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.
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57 Symbols °C ......... .............. ........... ............... ....... . 17 °F .......... .............. ........... ............... ....... . 17 A AC power vo ltage ......... ............... ... .... . 10 accuracy °C,°F sp ecification .... ..
Index 58 copper tubing ............ ....... ........... ...........6 copyrig h t ........ ....... ........... .............. ........ .i corrosiv e gases ............. .................. .. 3, 20 CSA ..... .............. ........... ............... ..
59 Index NPL .. ....... ........... ............... ........... .......... 1 O oil ..... ............... ........... .............. ........... ... 3 operatin g s tat e ............ ... .... ... ............... . 17 operatin g s tat e flow diag ram ..
Index 60 volta ge, mains supply ............. ....... ......10 W warning labels .............. .................. ...... iii warrant y ..... ....... ........... ............... ..........iv water .... ....... ........... .............. ........ ......
XENT AUR CORPORA TION, 84F HORSEBLOCK ROAD, Y APHANK, NY 1 1980 U.S.A. TEL (631) 345-3434 F AX (631) 345-5349.
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