AquaXact 1688 Dew Point Transmitter
Operator Manual
Page 1: ...AquaXact 1688 Dew Point Transmitter Operator Manual...
Page 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a commitment on the part of Servomex Group Limited This handbook is accurate at the date of printing but will be superseded and should be disregarded if specificatio...
Page 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...
Page 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...
Page 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...
Page 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...
Page 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...
Page 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...
Page 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...
Page 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...
Page 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...
Page 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...
Page 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...
Page 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...
Page 15: ...AquaXact Issue 1 0 Servomex Group Limited 2017 15 Figure 4 4 Electrical installation connector and connections...
Page 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...
Page 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...
Page 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...
Page 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...
Page 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...
Page 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...
Page 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...
Page 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...
Page 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...
Page 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...
Page 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...
Page 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...
Page 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...
Page 29: ...AquaXact Issue 1 0 Servomex Group Limited 2017 29 Appendix A Mechanical Drawings A 1 Dew point transmitter...
Page 30: ...30 Servomex Group Limited 2017 AquaXact Issue 1 0 A 2 Sample block...
Page 31: ...AquaXact Issue 1 0 Servomex Group Limited 2017 31 A 3 Sampling panel...
Page 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...
Page 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...
Page 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...
Page 35: ...AquaXact Issue 1 0 Servomex Group Limited 2017 35 Appendix D Uncertainty in LBS ppmV calculations...
Page 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...
Page 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...
Page 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...
