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Servomex AquaXact 1688, Руководство оператора

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Servomex AquaXact 1688 Скачать руководство пользователя страница 33

AquaXact Issue 1.0 

© Servomex Group Limited 2017 

33

 

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.  
In general, if the dew point is monitored in °C or °F, there is no need to change the factory 

default -100 °C to +20 °C settings, because the 4-20 mA provides sufficient resolution to 

measure the output better than the specified accuracy of the sensor. 
 

Содержание AquaXact 1688

Страница 1: ...AquaXact 1688 Dew Point Transmitter Operator Manual...

Страница 2: ...hout notice and does not represent a commitment on the part of Servomex Group Limited This handbook is accurate at the date of printing but will be superseded and should be disregarded if specificatio...

Страница 3: ...stallation 10 Sensor installation 10 4 1 Mechanical installation 13 4 2 Electrical installation 14 4 3 5 Operation 16 Starting up 16 5 1 6 Technical specification 17 Instrument 17 6 1 Sensor 18 6 2 Ap...

Страница 4: ...tter 29 A 2 Sample block 30 A 3 Sampling panel 31 Appendix B Current vs dew point 32 Appendix C Relationship of 4 20 mA output and instrument reading in ppmV or LBS 34 Appendix D Uncertainty in LBS pp...

Страница 5: ...into account may result in personal injury or death This symbol warns of specific hazards due to high voltages which if not taken into account may result in personal injury or death This symbol warns...

Страница 6: ...perly equipped external computers or DCS systems as well as the proprietary Servomex controllers The AquaXact controller also allows field span measurements and supports the field based sensor tip rep...

Страница 7: ...hould be stored in the desiccant container when not in use Mating connector 3 A USB memory stick with calibration files and an Adobe Acrobat file of this manual Check that you have received all of the...

Страница 8: ...e it again to transport the sensor between locations to store it between uses or to ship it back to the factory for certification The container can be attached to the loop cable by trapping the cable...

Страница 9: ...has been designed and verified by testing to meet the requirements of the EU EMC Directive 2014 30 EU for Industrial Scientific Medical equipment The sensor and the 4 20 mA loop are electrically conne...

Страница 10: ...in film sensor can be installed either directly in the line to be sampled in situ or in a slip stream of a sample system extractive To assure a long and accurate performance of the sensor it should be...

Страница 11: ...ing is preferable If in line installation is required make sure to install the sensor at the upper surface of the gas line to minimize its exposure to liquid water should condensation occur Also consi...

Страница 12: ...ble Figure 4 2 can be used as a guideline to configure a sampling system Figure 4 2 Extractive installation The transmitter is programmed to send ppm readings if that engineering unit is specified via...

Страница 13: ...ter materials If pressure regulators shut off valves etc are used upstream of the sensor make sure they do not contain rubber or other hygroscopic materials Mechanical installation 4 2 Various adapter...

Страница 14: ...pin connector IP65 NEMA 4X Figure 4 4 Do not force the connector When the connector engages secure it with the retention screw The AquaXact 1688 will draw 4 mA to 20 mA from the power supply depending...

Страница 15: ...AquaXact Issue 1 0 Servomex Group Limited 2017 15 Figure 4 4 Electrical installation connector and connections...

Страница 16: ...ove residual moisture from the sampling pipework Close the inlet isolation valve and install the transmitter into the sampling block Connect the cable and secure it using the retaining ring Note The p...

Страница 17: ...threads are available Electrical connections Industrial Standard 9 4mm 7 pin connector IP65 Cable The digital seven conductor cable or the two conductor 4 20mA cable must be shielded to meet CE requi...

Страница 18: ...is connected to the current loop but isolated from the AquaXact 1688 housing and installation Sensor 6 2 Type Thin film high capacitance Al2O3 Dew point range 100 C to 20 C Accuracy 3 C Repeatability...

Страница 19: ...e transmitter is allowed to freely vent to local atmosphere Do not store replacement tips for more than 12 months before use to assure the calibration is still valid Preventative maintenance 7 1 To mi...

Страница 20: ...indications that may occur Symptom more than 25 seconds after power up Possible cause Remedy Current loop Pin 3 Fixed at 21 mA 1 Failed Device 2 Open sensor 3 Shorted sensor Check sensor cycle power i...

Страница 21: ...in system or use of unsuitable pipe Comparison of readings with manual cooled mirror instrument Current loop outside of 4 20mA range 1 Prolonged exposure to wet gas 2 Instrument failure 3 Short circui...

Страница 22: ...bber or plastic pipe 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 containe...

Страница 23: ...ent in the layer is accurately sensed as a change in capacitance of the sensor The ability to absorb and desorb water molecules in the aluminum oxide layer is based on a certain level of water molecul...

Страница 24: ...vice Note The impact of long term storage is just a temporary slowing of the response to dew point changes and does not impact the overall life span of the sensor Do not store replacement tips for mor...

Страница 25: ...carry out any maintenance procedures other than those specified in this manual If you do you can damage the transmitter and invalidate any warranty The standard spares available for the AquaXact are...

Страница 26: ...s option items which are returned to it prepaid within one year from delivery to the carrier and found to the Seller s satisfaction to have been so defective In no event shall the Seller be liable for...

Страница 27: ...posure of the equipment Servomex will provide an estimate and wait for approval before commencing repairs For your convenience a Return Authorization Request Form is provided in section 11 2 Fill out...

Страница 28: ...one Fax Equipment information Part or model number AquaXact 1688 Serial number Original purchase date PO number Reason for return Failure and hookup description if applicable Process material s and or...

Страница 29: ...AquaXact Issue 1 0 Servomex Group Limited 2017 29 Appendix A Mechanical Drawings A 1 Dew point transmitter...

Страница 30: ...30 Servomex Group Limited 2017 AquaXact Issue 1 0 A 2 Sample block...

Страница 31: ...AquaXact Issue 1 0 Servomex Group Limited 2017 31 A 3 Sampling panel...

Страница 32: ...g output to be linearly proportional to those units approximately logarithmically proportional to dew point refer to the graph in Appendix C Naturally selecting C or F will cause the analog output to...

Страница 33: ...ge of 10 to 100 ppmV the 10mA variation is more than sufficient for a good measurement by the user s equipment In general if the dew point is monitored in C or F there is no need to change the factory...

Страница 34: ...34 Servomex Group Limited 2017 AquaXact Issue 1 0 Appendix C Relationship of 4 20 mA output and instrument reading in ppmV or LBS...

Страница 35: ...AquaXact Issue 1 0 Servomex Group Limited 2017 35 Appendix D Uncertainty in LBS ppmV calculations...

Страница 36: ...36 Servomex Group Limited 2017 AquaXact Issue 1 0 Appendix E Sensor response time Response Time of Servomex AquaXact Al 2 O 3 Sensors to a step change...

Страница 37: ...e either a MonoExact DF310E or dedicated AquaXact 1688 controller you will need to return your transmitter to Servomex for recalibration or have a service engineer visit during which the sensor tip ca...

Страница 38: ...iew 6 safety information conventions 5 scope 5 M maintenance policy 27 mechanical drawings 29 mechanical installation 13 O operation 16 safety 9 starting up 16 output 4 20 mA reading 34 overview 6 P p...

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