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1. Introduction

The XPDM is a portable, hand-held, microprocessor controlled, battery operated dew-point
meter with built in dry-storage for the sensor. The instrument is ideally suited for all
applications, where quick and precise measurements are required.

Standard Equipment:

Optional Equipment:

1. XPDM Portable Instrument with

5. VCO® to VCO® Fittings.

sensor, desiccant cartridge and

6. Pig tail.

lithium battery.

7. Flexible stainless steel hose.

2. 2VCO® to Swagelok® fittings and

8. Pressure regulator, all stainless steel,

2 Swagelok® to barbed hose fit-

(preset at 1.5 atm) with mounting

tings.

bracket.

3. Calibration bulb.

9. Coalescing filter, all stainless steel

4. Shoulder strap.

      with mounting bracket.(not shown)
10. Wall transformer (with factory installed
      I/O option).
11. Replacement desiccant cartridge.
12. Padded transport case.

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Содержание XPDM

Страница 1: ...1 345 3434 Fax 631 345 5349 Except as may be provided by contract this document and all specifications and drawings contained are the property of COSA XENTAUR Corporation are issued in strict confidence and shall not be reproduced or copied in any form or by any means or used as the basis for the manufacture or sale of apparatus programs or services without permission Check the Internet for update...

Страница 2: ...l or special damages of any kind or nature whatsoever including but not limited to lost profits arising from or in any way connected with this instrument or items hereunder whether alleged to arise from breach of con tract express or implied warranty or in tort including without limitation negligence failure to warn or strict liability VCO is a trademark of Cajon Swagelok Cajon are trademarks of S...

Страница 3: ...3 6 Options 14 6 1 RS 232C 14 6 3 Operating from an external Power Supply 16 7 Automatic Calibration 17 8 Changing desiccant cartridge and or battery 18 8 1 Changing the battery 19 9 Special Conditions for Safe Use 19 10 Special messages warnings and error indications 20 Apendix A Flow Diagram of User Interface in Operating State 21 Appendix B Flow Diagram of User Interface in Setup State 22 Appen...

Страница 4: ...table Instrument with 5 VCO to VCO Fittings sensor desiccant cartridge and 6 Pig tail lithium battery 7 Flexible stainless steel hose 2 2VCO to Swagelok fittings and 8 Pressure regulator all stainless steel 2 Swagelok to barbed hose fit preset at 1 5 atm with mounting tings bracket 3 Calibration bulb 9 Coalescing filter all stainless steel 4 Shoulder strap with mounting bracket not shown 10 Wall t...

Страница 5: ...sures slightly above atmospheric however each sample cell sensor piston dry storage assembly has been tested for pressures up to 120 PSI Do not introduce sample streams which could cause pressure rises above 100 PSI Make your measurements at atmospheric pressures and use the pressure calculation feature to calculate dew points at higher pressures Ask your representative for a regulator installatio...

Страница 6: ...iston 9 Filter Mesh 4 Sample Cell 10 Electronic Board 5 Sensor 11 Instrument Case 6 Spring loaded PTFE seals The drawing on the left shows the XPDM with the sensor in dry storage position The sen sor is enclosed in a gas tight container and surrounded by desiccant The sample gas passes through the sample chamber and prepares the environment for measurement Blocking of the outlet port will pressuri...

Страница 7: ... contamination with desiccant particles The factory supplied desiccant provides dry storage dewpoints as low as 80 C when fresh When the sensor is pushed into dry storage it will take some time to dry down completely and reach equilibrium with the dewpoint in the dry storage The dry down time to equilibrium depends on how wet the sensor was before it was returned to dry storage and in case that it...

Страница 8: ...ility for dew points above 65 C However PTFE tubes should be kept as short as possible Under no circumstances use rubber or plastic tubes which are both hygroscopic and permeable No valid measurements can be expected when such materials are used 4 1 3 Sample conditioning Pre filters Do not use any pre filters for oil particles or liquid water when measuring dewpoints below 65 C Pre filters store a...

Страница 9: ...ely stabilized before taking the final reading After the reading is taken push the sensor actuator back into the dry down position Note that when the instrument is being operated on a battery it will shut off automatically if no buttons are pressed for 6 minutes when sensor is in the sample chamber the out position or 3 minutes when sensor is in the desiccant The unit does not have to be on while ...

Страница 10: ...a particular mode lets you change a parameter by showing the word SET in the upper left corner of the display Be careful not to change any parameter inadvertently 3 C F appear simultaneously to indicate the sensors attenuation in decibels 4 Values higher than 1999 and lower than 0 01 are displayed in powers of 10 3 Either a 10 3 or 10 3 will appear above and to the right of the displayed value if ...

Страница 11: ...e is pressure correction in the computation of the displayed values Pressure correction is used in the context that the values displayed signify the moisture content at some pressure we refer to this as the Gas Pressure different than the pressure at the sensor Note that PPM LBS and G M 3 readings are by definition unaffected by pressure correction because only the pressure at the sensor affects t...

Страница 12: ...pling chamber if not it will prompt the user to pull the sensor out of the desiccant by beeping and displaying alternately PUL and OUT Pull the sensor actuator out when this message appears Since Autocal is a irreversible recalibration of the instrument there is one more beeping and visual prompting with alternating CNF and AC The down and pressure correct buttons allow cancelling the Autocal whil...

Страница 13: ...e instrument XTR 100 100 C to 20 C XTR65 65 C to 20 C 4 Adjusting low end sensor attenuation and or dewpoint These modes are used to enter a data pair representing a low dewpoint and the sensor attenuation measured at this low dewpoint NOTE Items 3 and 4 are set at the factory and need only be modified when a sensor is changed 5 Manual calibration Not yet available In this mode the user can enter ...

Страница 14: ...is needed since the connector is shared see the pin out table below In order to receive the dewpoint in the currently selected engineering units the host com puter must query the XPDM with CR The XPDM will respond with the dewpoint followed by characters indicating the currently selected engineering units followed by carriage return e g 79 1degC CR or 110 4degF CR or 0 0339LbsH2O mmscf CR or 0 625...

Страница 15: ...e sensor this feature may be useful in cases where a higher resolution output is required over a narrow dewpoint range or vise versa To verify or change the current loop scaling follow the instructions in the set up mode section 5 3 The current output is computed by the microprocessor as follows If pin 9 is grounded for a 4 20mA range R _ L O 16 4 H _ L Where O output current in mA R value of Read...

Страница 16: ...C to 25VDC when operating from external DC power The unit requires 12VACrms to 25VACrms when operating from external AC power In either case the unit can draw up to 50mA when the backlight is on and supplying cur rent loop output The power input is protected with a 250mA fuse The power input is isolated from the sensor and case however as a safety precaution there is a 1MΩ shunt to prevent electro...

Страница 17: ... micro climate in sample cell while the display is flashing AC _AC 10 After one minute the instrument displays calibration numbers to be stored in the instruments memory displays END and thereafter goes back into measuring mode The instrument is now calibrated 11 Push in the sensor actuator Instrument calibration is recommended in 12 month intervals the XTR65 sensor should be recalibrated after pr...

Страница 18: ...d by pulling out the sensor actuator The replacement cartridge is in a sealed tin container Open the container and remove the replacement desiccant cartridge Remove the GREEN cap DO NOT open the RED cap as the desiccant will spill out Screw in the replacement desiccant cartridge making sure that the same seals are in place as when you removed the old cartridge such as the PTFE washer and Viton O r...

Страница 19: ...22 Energizer L522 Varta C4922 9 Special Conditions for Safe Use WARNING The enclosure is made of aluminium If it is connected and used in an area where the use of category 1G apparatus is required it shall be installed such that even in the event of rare incidents ignition sources due to impact and friction sparks are excluded WARNING Do not replace battery when an explosive gas atmosphere is pres...

Страница 20: ...it will react SAT Sensor is saturated Dry down the sensor SHR Sensor circuit is shorted Check sensor Trying to calculate dewpoint for an undefined sensor Select sensor and autocal DRY Veiwing dewpoint while sensor is in desiccant dry storage A reminder that the dewpoint in the desiccant is being measured DB Trying to calibrate an undefined sensor Autocal tests See autocal instructions PUL OUT Prom...

Страница 21: ...21 Apendix A Flow Diagram of User Interface in Operating State ...

Страница 22: ...22 Appendix B Flow Diagram of User Interface in Setup State ...

Страница 23: ...23 ...

Страница 24: ...24 Appendix C Releationship of Instrument Reading and 4 20ma output when lds of H2O million standard cft or ppmv engineering units are selected ...

Страница 25: ...25 Appendix D Uncertainty in LBS and PPMV calculations ...

Страница 26: ...26 Appendix E Battery Life Note The ATEX approved model is supplied with and must use a GMBPower Battery model ER9V ...

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