Instruction Manual Model SDT
Contents
1. 68 2 68 10 0 4 Cem zz 0 og 9 soon Bupunow Zz f kh eZ HP 9217 vS2. 4 tube can be used where pressure drops across the 3mm tube are too high 3 Filter Unit A filter unit is recommended when the samples are likely to contain particulate matter If the air gas sample contains heavy hydrocarbon condensate the filter must be of the coalescing type with a drain The filter unit should be positioned as close to the sample point as practical 4 Pressure Reduction Valve or Pressure Regulator If the sample is to be measured at atmospheric pressure then the valve 4A should be fitted and 4B omitted from the system If the sample is to be measured at full line pressure and the exhaust vented to atmosphere then valve 4B should be fitted and 4 omitted from the system If measurements are to be taken at full line pressure and the sample is to be retumed to a part of the main line or a vent which is at a pressure higher than atmospheric and the input to that line needs a controlled pressure then both 4A and 4B will be required 5 Sample Pressure Gauge This is not a critical part of the moisture measurement but may be required if Dew Frost point measurements are to be made at higher than atmospheric pressure 6 Measuring Transmitter see Appendix A SDT with Connector General Arrangement 7 Transmitter Holder see Appendix B Transmitter Holder General Arrangement 8 Desiccant Chamber This item is required when the sampling is to be intermittent When installed it prevents the ingress of wet a
3. affected by changes in partial pressure of water vapour These changes are proportional to the dew frost point temperature The measuring transmitter can be installed directly into the process line but this does create problems with access for maintenance and calibration It is for these reasons that we recommend that the transmitter be installed in a bypass fast loop or total loss sample system where the transmitter is accessible without interrupting the main process flow line 2 1 Piping installation Schematic Mik 20 Bi LINE NOTES a The sample point should be on the uppersurface of a horizontal pipe or ona vertical section d pipe where ever possible b The sample tube should run continualy upwards from the sample point If this is not possible an inspection port or drain tap should be instaled at the lowest point in the system 2 1 Piping Schematic Component Index 1 Sample Isolation Valve This is a recommended item as it allows access to the sample system without interrupting the main process line 2 Sample Tube This should be stainless steel for dry air or gas applications but copper or carbon steel can be used where wetter gases are to be measured If any section of the sample tube must be flexible then PTFE should be used In most cases 3mm OD 1 8 is sufficient as it provides good system response time within minimum flow 6mm OD 1
4. purge through the whole sample system Set the required pressures and flows within the sample loop This completes the installation and commissioning but on initial start up it could take several hours for the system to reach equilibrium The SDT Ex is a 3 Wire 4 20mA transmitter For typical electrical connection please see Appendix A amp B 2 5 Connector Pins Blue Supply ve Red Supply ve Green mA output 3 Normal Operation 3 1 Analogue 4 20mA Mode 3 wire In normal operation the transmitter will produce a 4 20mA signal which is proportional to the level of moisture in the gas being monitored The moisture reading is sampled and up dated once per second The SDT Ex has 3020 distinct steps over the 4 to 20mA range corresponding to a resolution of 0 005mA 4 Autocal AutoCal allows the user to ensure accuracy to the laboratory calibration by checking the span of the transmitter and correcting for any deviation It should be operated periodically every 2 to 3 months say or can be used to verify operation of the SDT Ex Transmitter if confirmation of an unexpected result is required ACAL adjusts slope of curve Sensor Reading 100 There are two methods of setting the autocal 1 Saturate the transmitter Only applicable to C and F SDT Ex transmitters If the sensor element is exposed to a dewpoint level above the range of the transmitter the sensor will saturate and the transmitter output can be set a
5. the sensors very quickly Some less aggressive acidic gases such as sulphur dioxide SO2 can be monitored as long as the moisture content is low generally less than 100ppm v If in doubt please ask your supplier Sulphur hexaflouride SFs has no effect on the sensor If the gas has been exposed to arcing however it is possible that various acidic species will have been formed that will corrode the sensor When testing SFs that may have been arced therefore an acidity test should be carried out first if the gas proves to be acidic then the moisture test should not be carried out It is strongly recommended that the sample should not contain particulate matter oil or other heavy hydrocarbon condensate If these components contaminate the sample system and or the measuring sensor the system response time will be lengthened although the sensor calibration will not be effected 2 Installing the SDT Ex in a Air Gas Sampling System The piping installation schematic diagram shows all components which could be used in a gas measurement application although not all items shown will be required for every installation The flow rate although not critical should be low enough to avoid abrasion to the sensor surface without being so low as to extend the system response time to an unacceptable level In general a flow rate of between 2 and 3 litres min at NTP will give the right balance The sensor is a variable capacitor which is directly
6. 2A to SDT Ex Connections HAZARDOUS AREA SAFE AREA ae gt NED BI ole ei ale ES aen Hegit 190 612 SE 5 8 Slo oj IS 9 5 0 375 90 3 54 9 5 0 375 SDT Ex Transmitter Cable Connection Channel 1 Terminal 41 Supply ve BLUE Terminal 42 mA Output GREEN Terminal 44 Supply ve RED SDT Ex Transmitter Cable Connection Channel 2 If Applicable Terminal 51 Supply ve BLUE Terminal 52 mA Output GREEN Terminal 54 Supply ve RED APPROVALS ATEX 111G EExia IIC Applicable in Zones 0 1 or 2 NOTES Model PR5105B82A is a single channel unit Model PR51058826 is a dual channel unit asa Channel 1 Output Terminal 11 mA Terminal 13 mA Channel 2 Output If Applicable Terminal 21 mA Terminal 23 mA Power Supply Terminals 31 and 33 20 to 270VDC OR 22 to 250VAG 50 60Hz Maximum Power Consumption 3W 35mm 1 375 DIN Top Hat Rail Mounting Appendix C SDT Ex with Connector General Arrangement 34 00 1 34 dia lance ss 30mm 1 185 A F Km GL 2 uugrg 7 Process thread Ja x 16 UNF SZZ Ww Appendix B Transmitter Holder General Arrangement EP vel ove 49712 vS sBumy az1s Jawo Je 10 en jm sBumu aqn ay ssoJde uoisuawip ay sbumy 8qn GO IL ym umoys si Aiquiessy ay
7. A Signal Isolator Connection 8 9 1 Appendix B PR5104BB2A to SDT Ex Connections Appendix C SDT Ex with Connector General Arrangement 0 Appendix D Transmitter Holder General Arrangement Overview The Shaw Moisture Meters Model SDT Ex is a 3 wire 4 20mA loop powered transmitter used for continuous measurement of moisture in a process gas or compressed air The Model SDT Ex transmitter can be factory configured to output a 4 20mA linear signal for any of the following moisture units C or F dewpoint ppm v ppb v g m3 and Ib MMSCF The ultra high capacitance Shaw sensing element is long lasting and offers excellent sensitivity repeatability and response speed Each unit is calibrated traceable to International Humidity Standards and is supplied with a Certificate of Calibration guaranteeing accuracy to 2 C dew point The transmitter also incorporates an Automatic Calibration AUTOCAL feature which allows the user to carry out field calibration span check The AUTOCAL feature is operated by means of a small potentiometer built into the transmitter body To avoid accidental corruption the potentiometer is covered by a weatherproof seal in normal use The RISC microprocessor circuitry of the Model SDT Ex transmitter allows high resolution with advanced self diagnostics for fault conditions It also enables periodic re calibration of the moisture sensor storing calibration data within the fully self contained un
8. MOISTURE METERS ters We meters 5 hygromel Model SDT Ex Dewpoint Transmitter SHAW MOISTURE METERS UK LTD Bradford England BD1 350 ada 0 1274 733582 444 0 1274 370151 e mail shawneters com wivw shawmeters com Registered in England 2730480 Model SDT Ex Dewpoint Transmitter Instruction Manual Unpacking your Shaw Moisture Meters Model SDT Ex Please examine the SDT Ex package for any damage or mishandling If any damage is evident please notify the carrier and the Shaw Moisture Meters representative from where this unit was purchased You should have received if ordered 1 SDT Ex 4 20mA Dewpoint Transmitter 1 Connecting cable of the length specified on your order or 2m as standard 1 SDT Special Sensor holder 1 Instruction Manual 1 Pressure Dewpoint Circular Calculator If anything is missing please contact your distributor immediately Issue 1 0 12 2008 1937 SDT Ex User Manual Index 2 Installing the SDT Ex in a Air Gas Sampling Steg 2 1 Piping Installation Schematic 2 2 Piping Schematic Component Index 23 Installing and Commissioning the Model SDT Ex Transmitter 24 Wiring the SITE 25 Connector Pins 3 Normal Operation 31 Analogue 4 20mA Mode 3 wire 4 Autocal 41 Pre conditioning the transmitter 4 2 Adjusting the Autocal 4 3 Completing the autocal 5 Faults Errors 6 SDT Ex Specification 7 Appendix A SDT Ex and PR5104BB2
9. ir to the sample system while the sample is not flowing improving the response time 9 Flow Control Valve This can be a separate item or combined with the flow indicator 10 Flow Indicator The recommended sample flow is 2 to 3 SLM 11 Sample Exhaust The exhaust can be vented to atmosphere or retuned to the process line as discussed above 2 3 Installing and Commissioning the Model SDT Ex Transmitter It is advisable to carry out an initial purge routine of the sample loop before installing the transmitter in order to remove the possibility of sensor damage on start up Refer to the sample system schematic in section 2 1 Open the inlet isolation valve slowly until a small flow of airlgas at atmospheric pressure flows through the inlet pipe work to the transmitter holder and exhausts through the sensor entry port of the transmitter holder Allow this purge to continue for about 15 to 20 minutes to remove any residual moisture from the sample pipe work and components Close the inlet isolation valve and install the transmitter into the transmitter holder Locate and secure the four pin transmitter cable connector in positioned on the transmitter Use the locking screw in order to affect a weatherproof seal NOTE The Plug and socket will only locate in one position as the GND pin is different to the other three pins Open the inlet valve slowly again and by opening all valves after the transmitter holder allow a low pressure
10. it Loop powered by a 7v to 28v dc source The Model SDT Ex transmitter will provide the user with a linear 4 20mA signal over the chosen range The mechanics of the Model SDT Ex transmitter have been designed to cope with extreme environmental conditions The rugged stainless steel construction and anodised aluminium offers protection to IP66 NEMA4X with the transmitter electrical connections made via secure industrial type connector size C DIN EN 175301 The SDT Ex transmitter can withstand 35 000 kPa 350bar maximum pressure and by employing low resistance cable the transmitter can be located at significant distances in excess of 1000 meters from the data collection point Designed with the operator in mind for reliable and accurate measurements the Model SDT Ex is extremely easy to install and operate requiring little or no maintenance 1 1 Gas Compati ies The Model SDT Ex sensing elements are AkO and therefore suitable for many different industrial and research applications Most gases can be checked for their moisture content with no need for the calibration to be altered when changing between different gases as the sensor operates only with reference to the water vapour content However some gases must be avoided as they are not compatible with the material used in the construction of the sensor Ammonia NH3 and chlorine Cl must be avoided at all times even in small quantities Hydrogen chloride HCI also attacks
11. ompatibility EMC Warm Up Time Fault Conditions Isolation Transmitter Enclosure Sensor Protection Probe Material Wetted Parts Weatherproof Classification Mechanical Connection Mechanical Warranty Calibration Warranty Weight Immunity Complies with EN 61000 6 1 2001 Emissions Complies with EN 61000 6 3 2001 10 seconds Sensor Open Circuit Output drives to 20 50mA Sensor Short Circuit Output drives to 20 75mA Sensing Element connected to the 4 20mA loop but isolated from body 316 Stainless steel body with size C DIN EN 175301 connector 316 Sintered stainless steel filter 50 micron 316 Stainless Steel IP66 NEMA4X when Connector mated to Transmitter 3 4 UNF 16tpi with integral Viton O ring seal 24 months in case of faulty workmanship and defective parts 12 months subject to usage 175grams includes connector 7 GUARANTEE All Shaw products are guaranteed for two years from the date of purchase some exclusions are as follows Removing protective guard from any sensor subjecting sensor to shock or black list gases e g caustic and acidic gases like ammonia and chlorine tampering with any internal electronics and applying incorrect supply voltage to meters subjecting to excessive flow rate contaminants and general mis use If you suspect a fault which you feel needs to be attended to under guarantee please contact us for assistance hopefully to help fault find and effect a
12. remedy and if this is not successful to give precise instructions for the return for inspection No equipment will be replaced or repaired without having been returned for inspection either to ourselves or an authorised distributor 8 Basic Definitions WATER VAPOUR PRESSURE Is the pressure exerted by the water vapour contained in any mixture of gases The total pressure exerted by the gas mixture is the sum of the pressures exerted by its components including the water vapour Water vapour pressure varies in direct proportion to the total gas pressure RELATIVE HUMIDITY Is the ratio of the actual water vapour pressure to the saturation water vapour pressure at the same temperature DEWPOINT TEMPERATURE Is defined as the temperature to which the gas must be cooled in order that it should be saturated with water vapour i e 100 relative humidity For practical reasons it is referred to water above 0 deg C and ice below 0 deg C PARTS PER MILLION BY VOLUME PPM V or VPM is the ratio of the water vapour pressure to the total gas pressure PARTS PER MILLION BY WEIGHT PPM W is the same as VPM except that the figure is modified according to the ratio of the molecular weight of water vapour to the molecular weight of the carrier gas mixture Stott peze tra 9 MHS aoste Katau ET WiZ Dr Basi Ose taa omoa asawa IEN TT Set Uu Amen eent See aga 92 EISE ee u at een een pur ounaeseduos ones aya ae EEN andea 1970m voryeanaws aya 03
13. rrected dewpoint and can be reinserted into the process Faults Errors e If the sensor is short circuited the transmitter will produce a constant 20 75mA output If the sensor is open circuited the transmitter will produce a constant 20 50mA output 6 SDT Specification Display Output Signal Operating Voltage Maximum Series Resistance Sensing element Autocal Factory calibration Accuracy Temperature compensation Resolution Repeatability Operating temperature Storage Temperature Operating Pressure Operating Humidity Sample Flow Rate Cable Terminations Cable Compatible with the 4 20mA loop powered indicator 4 to 20mA Linear 7V 28V DC Reverse polarity protected 40 x Supply Voltage 7 Q Ultra High Capacitance Aluminium Oxide Type Field calibration Span check facility Supplied with Certificate of Calibration traceable to NPL NIST 2 C dewpoint NPL NIST traceable for range 90 C to 20 C Temperature compensated for operating range 5pA Better than 0 3 C dewpoint 20 C to 60 C 20 C to 70 C From 1kPa 0 01 barA to Maximum 35 000kPa 350 barA Maximum 95 RH Non condensing Independent but ideally 2 to 5 litres per minute Max 25 litres min IP66 NEMA4X rated size C DIN EN 175301 connector at the transmitter and other end terminated with bootlace ferrules Supplied with 2m standard cable Nominal diameter 3 4mm 920hms km Electromagnetic C
14. s 20 C The easiest way to achieve this is to wrap ones hand around the sintered stainless steel guard that protects the sensing element Note This is only recommended for transmitters used in non toxic non poisonous clean gasses Local Health and Safety Procedures should be followed at all times 2 Expose to a known moisture level Applicable to all versions of SDT Ex Transmitters If a known gas is available or the ambient dewpoint is known then the autocal can be set to the known value rather than the saturating value The SDT Ex is supplied with an adjustable potentiometer to perform autocal which allows the calibration span of the transmitter to be adjusted This potentiometer is located under the weatherproof guard and can be accessed by undoing the large silver coloured screw on the side of the transmitter body The autocal is adjusted by turning the potentiometer with the small screwdriver supplied The following steps describe the process of setting the autocal describing the two different methods where different Note The SDT Ex must be connected to its normal indicator so that readings can be taken or where no indicator is employed an accurate measurement of the mA output must be taken 4 1 Pre conditioning the transmitter To perform the autocal the transmitter needs to be removed from the process gas ready to be saturated in the hand or inserted into a known gas flow At this stage the display indica
15. tor will read the ambient dewpoint as measured by the SDT Ex Saturating the Transmitter method Only applicable to C and F SDT Ex transmitters Saturate the transmitter by lightly covering the sintered aluminium area with a hand for approximately 1 minute Expose to a known moisture level Applicable to all versions of SDT Ex Transmitters Expose the transmitter to the known autocal moisture level and allow the transmitter to attain equilibrium For technical questions and advice on the time taken to attain equilibrium Contact your SDT Ex supplier 4 2 Adjust the Autocal Once the transmitter has been pre conditioned the Potentiometer can be adjusted ONLY ADJUST THE POTENTIOMETER IF THE SENSOR IS PROPERLY PRE CONDITIONED FAILURE TO COMPLY WILL CORRUPT THE TRANSMITTERS CALIBRATION In the case of a transmitter saturated in the hand the display should read 20 C or 20mA if reading current Note Always dry the output level down below 20 C before wetting back up to exactly 20 C Ifa known dewpoint is applied then this value should be displayed 4 3 Completing the autocal Once the desired value is reached the autocal process is completed and the screw driver should be removed from the potentiometer and the weatherproof guard should be replaced and fastened using the large silver coloured screw If using the saturated transmitter method the transmitter can be put down on a work bench The SDT Ex will now output the co
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