instruction manual
Contents
1. Relative Humidity 10 Environmental Approvals EMC Safety Front Panel Seal Supply Voltage Power Consumption 11 Physical Dimensions Weight Mounting Terminals dewTEC DS2000 User s Manual Red green 7 segment 5 digit primary display 1 digit secondary display 18mm 0 7 linches primary display 7mm 0 3 inches secondary display Alarm 1 and Alarm 2 status From 110 C to 20 C 2 C over full range Male coaxial plug CE Atex 10Hz 14 bits Detected within two seconds All alarms become active NPN open collector Output tied to Alarm 1 Output 2 tied to Alarm 2 Single pole double throw 2A resistive 120 240V 50 60Hz gt 500 000 operations at rated voltage current Inherent Single pole double throw 2A resistive 120 240V 50 60Hz gt 500 000 operations at rated voltage current Inherent 0 5V 1 5V 1 10V 2 10V 0 20mA and 4 20mA 0 5 max of display value 500Q max for mA ranges 500Q min for voltage ranges Serial asynchronous UART to UART Open ASCII one start bit even parity seven data bits and one stop bit RS485 99 Selectable 1200 2400 4800 or 9600 20 C 2 C 60 70 90 264V 50Hz 0 C 55 C 20 95 non condensing CE Certified to EN61326 Notes 1 For RF fields 10V m 80 Am 1kHz the reading accuracy may be impaired by up to 0 3 in the frequency band 87 to 109MHz 2 For line conducted disturbances induced by RF fields 10V 80 AM2. Each message starts with a Start of Message character L and finishes with an End of Message character A reply from the addressed instrument will contain either a positive acknowledgement or a negative acknowledgement A positive acknowledgement has the character A immediately preceding the End of Message character a negative acknowledgement has the character N immediately preceding the End of Message character There are two message formats they permit instrument identification Parameter Read operations and Parameter Write operations 5 3 1 Message Form 1 The master device sends a Form 1 message to ascertain whether an instrument occupies a specific communications address If there is an instrument at that address a reply with a positive acknowledgement is received If there is no instrument at that address or there is a communications link failure no reply is received The message from the master device must be of the form Laa where aa is the address a two digit hexadecimal number The reply from the addressed instrument is of the form Laa A Where aa is the same address as in the received message dewTEC DS2000 User s Manual Page 18 i y alphamoisture This message implements a Parameter Read operation The message from the master device is of the form 5 3 2 Message Form 2 Laap where aa is the address a two digit hexadecimal number p is a single character parameter identifier see table
3. 2 Message Form 2 19 5 4 Error Conditions 19 6 0 Maintenance and Troubleshooting 20 6 1 Maintenance 20 6 2 Problem Guide 20 Appendices 22 Appendix A Product Specification 22 Appendix B General Arrangement 23 Document No 1125 Issue 4 12 01 05 dewTEC DS2000 User s Manual Page v y alphamoisture dewTEC DS2000 User s Manual Page vi 1 0 1 1 i y alphamoisture General Description amp Features Description The dewTEC DS2000 is a DIN style panel mounted dewpoint meter designed to accurately measure the dewpoint in gas or dry compressed air The operating range of the unit is factory set to the Moisture Sensor supplied with the unit Process moisture value in factory set units of C F or PPM V is indicated by the dewTEC DS2000 dewpoint meter on a large five digit seven segment display The main external body of the Ultra High Capacitance Moisture Sensor is made of plated steel and a stainless steel filter guard protects the sensing element within it The sensor can be located up to one kilometre away from the dew point meter 1 2 1 2 1 Main Features Dewpoint Meter Features The dewTEC DS2000 dewpoint meter s main features are 1 2 2 Display Five large LED digits and one small LED digit both with seven segments Two alarm status LED s User programmable LED indication to display in either Green or Red and can be programmed to change colour when in alarm condition Programmable via push b
4. 9600 setting Display Colour Change Defines the colour of the Ed J Red primary and secondary displays prior to after the f EEnj Green N Poor alarm level is reached Ge i a rd Final Red to Green F LA Alarm Lock Enables Disables the changing of alarm Em Enabled User adjustable settings via the front panel d 453 Disabled setting Help Prompt Determines whether the Primary MF yes User adjustable HELP H F Display shows the parameter description for 3 lt setting seconds before a parameter value is shown H P No Remember that if Help is enabled the Primary Display shows the Displays given above and the parameter value after three seconds dewTEC DS2000 User s Manual Page 15 4 2 2 Configuration Mode To enter Configuration Mode and to exit Configuration Mode Press and hold W and P simultaneously for 3 seconds dewTEC DS2000 DEWPOINT METER alphamoisture i y sv U ALM 1 ALM 2 In configuration mode the secondary display flashes continuously and shows a single character which identifies the displayed parameter Once in Configuration Mode follow these instructions to view and set parameters e Press P to scroll through the configuration mode parameters as described in paragraph 3 3 for the operating parameters e To edit any displayed parameter press gt to enter edit mode and V to decrement any digit as described in paragraph
5. General Arrangement dewTEC DS2000 User s Manual Page iii y alphamoisture dewTEC DS2000 User s Manual Page iv CONTENTS HOW TO USE THIS MANUAL iii 1 0 General Description amp Features 1 1 1 Description 1 1 2 Main Features 1 1 2 1 Dewpoint Meter Features 1 1 2 2 Sensor Features 1 2 0 Installation Instructions 2 2 1 Safety Information 2 2 1 1 Warning 2 2 1 2 Isolation 2 2 2 Unpacking your dewTEC DS2000 Dewpoint Meter and Sensor 2 2 3 Sensor Care 2 2 4 Installing the air gas sampling system 3 25 Installing and commissioning the sensor 5 2 6 Installing your dewTEC DS2000 Hygrometer 6 2 6 1 Panel mounting cut out 6 2 6 2 Panel mounting 6 2 7 Electrical interface connections 6 2 7 1 Mains line supply or optional DC Input 7 2 7 2 Sensor Connection 7 2 7 3 Alarm Relay Outputs 7 2 7 4 Linear Analogue re transmission Output 7 2 7 5 Alarm Transistor Open Collector Outputs 8 2 7 6 Serial Communications Output 8 2 7 7 External Autocal Control 8 3 0 Operating Instructions 9 3 1 Start Up 9 3 2 Front Panel Display and Keys 9 3 3 Viewing Operating Mode Parameters 10 3 4 Setting the Alarms and hysterisis 11 3 5 Hysterisis Operation 12 3 6 Resetting a latched Alarm 12 4 0 Hygrometer Settings 13 4 1 Sensor Calibration AUTOCAL 13 4 2 Programmed Settings 14 4 2 1 Program Mode 14 4 2 2 Configuration Mode 16 5 0 Serial Communications 18 5 1 Data Format Baud Rate 18 5 2 Protocol 18 5 3 Message Format 18 5 3 1 Message Form 1 18 5 3
6. and adjusting the reading to the maximum dewpoint on the hygrometer display using the Autocal Control on the hygrometer rear panel L N B A COM N C COM NO W l es 13 14 15 16 17 18 19 20 21 12 TOP 22 NC 11 23 coM 10 ai S 24 NO 9 8 7 6 5 4 i 2 1 Autocal DPe ii OPI Control Factory calibration is performed by comparing readings given from the hygrometer with readings obtained from a primary standard traceable to The British Standard moisture generator held at the National Physical Laboratory These comparative readings are taken after the sensor has been set to automatic calibration and the results are shown in the calibration certificate supplied with each sensor To autocal the sensor follow these simple steps 1 Disconnect the coaxial cable from the sensor Remove the sensor from its normal position so it is exposed to ambient air or hold in the palm of the hand if the sensor full range is 20 C dewpoint 2 Leave the sensor for approximately five minutes this time is not critical but the hygrometer reading should be stable before any adjustment is made It is not advisable to leave the sensor exposed to ambient air for more than a few minutes as this will impair dry down when the sensor is re installed 3 IF NECESSARY adjust the Autocal control on the analyser front panel until the display indicates the max
7. continued up to 10 Scaling Points and 10 Display Points until a scaling point is given the value 100 0 This will be the final scaling point offered Note the hygrometer only allows Scaling Point 1 lt Scaling Point 2 lt Scaling Point 3 etc d e F Decimal Point Position Defines the decimal point 0 to 0 0000 Factory setting position for the dewpoint display and alarm values Do not change Re transmission Scale Minimum The lower end of 19999 to E p the linear scale for the re transmission output 19999 User adjustable Z UN expressed as the value corresponding to the setting minimum output signal Re transmission Scale Maximum The upper end of 19999 to FE HA os the linear scale for the re transmission output 19999 User adjustable CE Mw ve expressed as the value corresponding to the setting maximum output signal GEE J m Offset Offsets the input by a fixed amount 19999 to Not normally w g vf 19999 required Input Filter Time Constant Filters the input over a 0 0 OFF to Normally set to EE Pm user definable time period to minimise the effect of 100 0 zero User Ct F b noise and impulses settable in noisy environments Adder Communication Address The unique serial 1 to 99 User adjustable nor 8 ve communications address of the hygrometer setting God n Baud Rate Serial Communications speed 1200 2400 User adjustable VO W 4800 or
8. discussed above 2 5 Installing and commissioning the sensor It is advisable to carry out an initial purge routine of the sample loop before installing the sensor in order to remove the possibility of sensor damage on start up Referring to the sample system schematic in section 3 4 open the inlet isolation valve slowly until a small flow of air gas at atmospheric pressure flows through the inlet pipe work to the sensor holder and exhausts through the sensor entry port of the sensor 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 sensor into the sensor holder Securely push fit the coaxial sensor cable connector in position on the sensor Open the inlet valve slowly again and by opening all valves after the sensor holder allow a low pressure purge through the whole sample system Note If a closed by pass loop is installed this section of the procedure is not possible 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 dewTEC DS2000 User s Manual Page 5 i y alphamoisture 2 6 Installing your dewTEC DS2000 Hygrometer The dewTEC DS2000 is a standard 1 8 DIN size 2 6 1 Panel mounting cut out The panel on which your hygrometer is to b
9. entered dewTEC DS2000 User s Manual Page 11 Oe 3 5 Hysterisis Operation Operation of the hysterisis depends on whether the alarm is set to trip on high or low The diagram below shows how the hysterisis functions in each mode Dewpoint PROCESS Alarm value HIGH ALARM Alarm inactive gt a Alarm active lt Alarm inactive PROCESS LOW ALARM Alarm value Alarm inactive gt a Alarm active gt lt Alarm inactive 3 6 Resetting a latched Alarm If Alarm 1 is configured to be a latching alarm relay when it is active it can be reset as follows 1 Ensure Dewpoint is displayed ALM 1 ALM 2 Y gt P R dewTEC Model DS2000 DEWPOINT METER 2 Press reset key R ph Note the latched alarm cannot be reset whilst the alarm condition persists dewTEC DS2000 User s Manual Page 12 i y alphamoisture 4 0 Hygrometer Settings 4 1 Sensor Calibration AUTOCAL One of the most valuable advantages of the sensors is the Autocal feature The system relies on the fact that each sensor is designed to vice no further increase in reading when it reaches its maximum moisture level This means that the sensor will read its maximum value when it is exposed to gas or air that is at that level and will continue to read that value when it is exposed to wetter gas The system can therefore be calibrated to the analyser on site very simply by exposing the sensor to anything wetter than the maximum level
10. of re transmission can be set to anywhere within the hygrometers operating range See section 4 on how to set your options The output is isolated from the rest of the unit and should be wired using a twisted pair or screened wire Load Impedance is 500Q maximum in mA ranges and 500Q minimum in voltage ranges dewTEC DS2000 User s Manual Page 7 i y alphamoisture The open collector outputs of Alarm 1 and 2 are NPN outputs The return is common for both collectors 2 7 5 Alarm Transistor Open Collector Outputs 2 7 6 Serial Communications Output The cable used should be suitable for data transfer at the selected rate 1200 2400 4800 or 9600 over the required distance Transmitters receivers conform to the recommendations in the EIA Standard RS485 The A terminal on the hygrometer Terminal 17 should be connected to the A terminal on the master device the B terminal on the hygrometer Terminal 16 should be connected to the B terminal on the master device and the Common terminal on the hygrometer Terminal 18 should be connected to the Common terminal on the master device Where several hygrometers are connected to one master port the master port transceiver in the active state should be capable of driving a load of 120k per indicator The masterport transceiver in the passive state must have pull up pull down resistors of sufficiently low impedance to ensure that it remains in the quiescent
11. 1kHz The instrument is self recoverable in the frequency band 0 15 0 73 Hz Complies with EN61010 1 To IP66 90 264V 50 60Hz or 22 55V DC input option 7 5VA max or 5W max DC input option Height 48mm Width 95mm Depth 110mm without sensor connector 0 21 kg max Panel mount press fit fixing Panel cut out 45mm x 92mm Screw type Page 22 alphamoisture Appendix B General Arrangement uoneoyyuap uonounj soy uorjoun J VILIN INIOIMIA 000280 IPPON DHL s q31uuelv uonesipu SS82014 84 0 96 yeysed Buljeas jauedg Buyunoyy 68 1 0 8r dweep jeued sjeyoyey Bulyoo 7 due HOd CEZSH 09 9 L6 seuiusL nd no ndul 221 6 vb UNWIXEW 5Z 0 0 9 v0 VOL 76 0 004 JOJOWONUDJOJ jedojny S a l s gt Go ep gt doode 1920S uono uuoo 21429 10SU8S Page 23 dewTEC DS2000 User s Manual
12. 3 4 for setting the alarms The following table gives the parameters and their seguence Primary Identifier Description Adjustment Range STATUS Display Flashing Display Description Input Range K TEIx Factory setting o Las j Sensor Ponor chanpe Power Supply Freguency Automatically PET only needs to be set for optional tie 50Hz set for mains r DC input instrument AE 60Hz din QE instruments F c r Process High Qp 1 Alarm 1 Type Defines the an Process Low User a action of ee Alarm 1 MONS o No Alarm Alarm 2 Type Defines the H Process High GT 2 E ac onof a User a setting Alarm 2 KAR 4 Alarm 1 non latching Output 1 Direction Determines nd u se een how NPN JUN Alarm 1 non latching Output 1 and m U reverse action Relay 1 operate v Alarm 1 latching Mn T pt f Oak U direct action User adjustable K a ue T Alarm 1 latching setting b a U reverse action E 1 J Logical OR Alarms 1 amp 2 LC Uu direct action UD ter J Logical OR Alarms 1 amp 2 wry reverse action dewTEC DS2000 User s Manual Page 16 alphamoisture soe U 7 Output 1 Direction Determines how NPN Output 1 and Relay 1 operate Alarm 2 direct action Alarm 2 reverse action Logical OR Alarms 1 amp 2 direct action Re transmission Linear Output Selects the output range NOTE The hygrometer is
13. al wrongly set Re adjust autocal as described in this manual Display reads Open circuit cable Disconnect sensor cable and check continuity Repair or replace cable Open circuit sensor Check continuity to body of sensor Disconnect sensor cable Short circuit cable terminals and if display indicates br EAP replace sensor or zero continuously Instrument unserviceable Disconnect sensor Short circuit cable terminals and if display does mot indicate br EAP return instrument for service Wet Reading Leak in system or sue of Cure the leak or replace unsuitable pipe with copper or unsuitable pipe stainless steel Flexible connection should be made with PTFE pipe NEVER use rubber or plastic pipe Comparison with Secondary Ensure that samples are taken from same sample point Standard Instrument or Re check Autocal setting If problems still occur re Calibration Gas calibration of the system is recommended dewTEC DS2000 User s Manual Page 20 alphamoisture SYSTEMS U Problem Cause Solution Slow Response Free water in system Wrongly sized or incorrect material in sample lines Check drain amp inspection ports in the main system amp sample pipe work Refer to installation section of this manual amp ensure sample tube material amp flow rates are as recommended Dry Reading Autocal wrongly set Comparison with Secondary Instrument or Calibration Gas Re adjust autocal as described i
14. ame TE F azi a n RES Alarm 1 Hysterisis value LI i r L E N R N v i 4 alphamoisture are scrolled through as the NOTE These displays will not appear if the Help 1 I Li 1 1 PRESS I i I function is disabled i Page 10 i y alphamoisture Note Alarm settings cannot be changed if the alarm LOCK is enabled in the hygrometer program settings Edit mode for Alarm 1 Alarm 2 and hysterisis settings can be entered by pressing the scroll key P when the parameter is displayed This is the first step shown in the flow diagram below Follow the rest of the steps shown in the diagram to set your required valve 3 4 Setting the Alarms and hysterisis 1 Select required alarm or hysterisis parameter display See paragraph 3 3 Note if in edit mode no key activity occurs for 90 seconds the hygrometer automatically returns to WU PAIX D oS o operation mode at the point where the setting mode was entered and cancels any changes made 5 Oo Next digit flashes 5 Repeat steps 3 and 4 for each digit required 6 When adjustment is complete confirm new pipe z value by pressing P WREE 65566 All digits will stop flashing and new valve will be displayed PRESS Display is now back in operating mode at the point where the setting mode was
15. below The reply if the Parameter Read operation is successful is of the form LaapnnnnA where aa is the same address as in the received message p is a single character parameter identifier see table below nnnnn is the data a five digit hexadecimal number If the specified parameter is invalid e g not applicable to the addressed instrument the reply is of the form Laap00000A where aa is the same address as in the received message p is a single character parameter identifier see table below Identifier Hex Parameter Range 3A Dewpoint Depending on factory set range 3B Total Value 19999 to 99999 lt 3C Maximum Dewpoint 19999 to 99999 3D Minimum Dewpoint 19999 to 99999 gt 3E Elapsed Alarm 1 Time 0 to 60000 E 45 Alarm 1 Dewpoint Range Maximum to Range Minimum F 46 Alarm 2 Dewpoint Range Maximum to Range Minimum 5 4 Error Conditions If a slave detects a syntax error or parity error it will not reply to the message the master device should make up to two retries applying the two second No Reply timeout in each case Parameter read operations with parameter identifiers which are not applicable to the addressed instrument will have no effect and a positive acknowledgement will be returned dewTEC DS2000 User s Manual Page 19 alphamoisture SYSTEMS U 6 0 Maintenance and Troubleshooting 6 1 Maintenance The dewTEC DS2000 front panel can be wiped clean when neces
16. dewTEC DS2000 dewpoint meter A alphamoisture U Y gt P R dewTEC Model DS2000 DEWPOINT METER instruction manual alpha moisture systems alpha house 96 city road bradford BD8 8ES england Tel 44 1274 733100 Fax 44 1274 733200 Email info amsystems co uk Web www amsystems co uk y alphamoisture dewTEC DS2000 User s Manual Page ii 4 y alphamoisture HOW TO USE THIS MANUAL IMPORTANT USER MUST READ THIS MANUAL BEFORE OPERATING THE dewTEC DS2000 DEWPOINT METER This manual comprises of six sections viz Section 1 Section 2 Section 3 Section 4 Section 5 Section 6 Appendices General Description Includes general description outlining the main features of the unit Installation Instructions Safety Information Unpacking your dewTEC DS2000 and Moisture Sensor Sensor Care Sensor Installation Dew Point Meter Installation Electrical Connections External AUTOCAL Control Operating Instructions Start Up Front Panel Display and Keys Viewing Pre Set Parameters Alarm Settings Resetting a Latched Alarm dewTEC DS2000 Settings AUTOCAL Factory Set Parameters Calibration Data Analogue Output Span Offset Filter Serial Communications Display Colour Lock Help Alarm Mode and Direction Analogue Output Type Totaliser RS485 Serial Communications Data Format Protocol Message Form Maintenance and Trouble Shooting Maintenance Problem Guide Specifications and
17. e mounted must be rigid and up to 6mm thick The cut out size required is shown in the diagram below 92 00mm 0 5 0 0 2 6 2 Panel mounting Your hygrometer is supplied with a panel gasket and push fit fixing strap Do not remove the panel gasket as this may result in inadeguate clamping of the hygrometer in the panel Remove the push fit fixing strap and place the hygrometer through the cut out from the front Then slide the fixing strap over the hygrometer housing from the rear of the panel until the tongues engage in the ratchets and hygrometer is firmly in place 2 7 Electrical interface connections The rear terminal houses all connections to the unit The connections are shown in the diagram below and each input is described further in the following paragraphs See the full specification given at the end of this manual for more details on the interfaces POWER SUPPLY 22 55VDC5W RELAY 1 OR 50 60Hz 7 5VA L N B A COM NC COM NO Relay Contacts 100 240Vac 2A Resistive l 1 1 1 0 240Va 13 14 15 16 17 18 19 20 21 BE 12 TOP 22 NC e OD EJ m OOO B oh Bo ay Connector 24 NO 9 8 7 6 5 4 3 2 1 NPN COM NPN O P2 opi INTERNAL USE ONLY dewTEC DS2000 User s Manual Page 6 i y alphamoisture The hygrometer will normally operate on 90 264V AC 50 60Hz mains line voltage The power consumption is 7 5VA When the Optional DC version is used the operating voltage
18. et press the R key when displayed Minimum Lo Dewpoint since last reset To reset press the R key when displayed Accumulated time that Alarm 1 has been active since last reset This display format is in mm ss up to 99 minutes and 59 seconds after which the format changes to mmm s To reset press the R key when displayed Dewpoint at and above which Process High Alarm or at and below which Process Low Alarm Alarm 1 is active To set press P when displayed and follow the instructions given in paragraph 3 4 Defines the width of the hysterisis band in dewpoint applied on the safe side of the Alarm 1 level Set in the same manner as Alarm value Dewpoint at and above which Process High Alarm or at and below which Process Low Alarm Alarm 2 is active To set press P when displayed and follow the instructions given in paragraph 3 4 Defines the width of the hysterisis band in dewpoint applied on the safe side of the Alarm 2 level Set in the same manner as Alarm value Total value based upon integration of the input signal using the time base set in the hygrometer settings Automatic display change if there is no key activity after 3 seconds lt lt Display change due to key activity dewTEC DS2000 User s Manual Qa DEWPOINT v gt P R PRESS Qa Maximum n High value ps v rie Minimum Low value DS pp O
19. example by touching or making any other physical contact as this may damage the sensing surface and render the Sensor useless Additionally the following guidelines should always be followed e For any reason whatsoever DO NOT REMOVE THE SENSOR GUARD OR ATTEMPT TO CLEAN THE SENSING ELEMENT WITHIN IT The Sensor is NOT user serviceable and does NOT contain any user replaceable parts In the event of a problem follow the problem guide at the end of this manual dewTEC DS2000 User s Manual Page 2 i y alphamoisture e When not in use the sensor should always be stored in the desiccant contained metal canister e The sensor should not be exposed to ambient conditions for considerably long periods e Exposure of the sensor to liquid water or condensing atmospheres should be avoided e The sensor should not be exposed to corrosive contaminants such as chlorine ammonia or mercury vapours These gasses will gradually corrode the sensor and cause a loss of sensitivity hence affecting the system accuracy e Avoid heat sources and extreme temperatures when choosing installation site e Ensure the sample gas exposed to the sensor is clean as contaminants such as oil glycol and heavy hydrocarbons can mask the sensing element thus affecting the system response If this is an issue contact your dewTEC DS2000 supplier for advice on a suitable sample system 2 4 Installing the air gas sampling system The piping installation schematic diagram be
20. factory set to give either voltage or current outputs See the specification sheet and your order for your hygrometer setting Logical OR Alarms 1 amp 2 reverse action User adjustable setting None 0 5V 1 5V 0 10V me curt Ue E E Communications Enable Disable Only disable this function if comms is giving you a problem User adjustable setting None Disabled 5 ju D aa u 09 io Comms Enabled Not available xs J m r Totaliser Timebase Not available User adjustable setting Seconds Minutes dewTEC DS2000 User s Manual Hours User adjustable setting Page 17 i y alphamoisture 5 0 Serial Communications The Serial Communications Port is a standard RS485 communications link Up to 32 standard RS485 loads may be present in a single loop on this link 5 1 Data Format Baud Rate Data is format as a 10 bit data word i e 1 Start bit 7 Data bits 1 Parity bit even parity and 1 Stop bit Supported Baud Rates are 1200 2400 4800 9600 bits second The half duplex line turn round time is fixed at 6ms regardless of baud rate The maximum inter character delay is 120ms The No Reply timeout is 2 seconds 5 2 Protocol The protocol operates on a single master basis The master device initiates all communication The hygrometer acts as a slave device 5 3 Message Format
21. he parameter value Note this function will only operate if the Help Facility is enabled see section 4 Dewpoint Meter Settings S d Displ This single character identifier highlights the parameter value being displayed Secondary ISplay not lit when normally displaying the process Dewpoint Moisture value Down key W In Edit Mode decrements the flashing blinking digit in the Primary Display Puts the Dewpoint meter into Edit Mode In Edit Mode this key selects the digit to be altered in Primary Display digit selected for alteration flashes blinks P Selects parameter to be viewed edited In Edit Mode this key confirms edited parameter value When in normal display mode pressing this key resets a latched alarm condition Reset Key R Also resets the Maximum High Value Minimum Low Value or Alarml Elapsed Time whichever parameter is displayed Down and Scroll Keys When pressed simultaneously in Edit Mode the unit will abort the Edit operation W amp gt and will restore the parameter to its initial value Scroll key gt Program Key ALM 1 and ALM 2 LED Indicators lit in all operation modes when in alarm condition dewTEC DS2000 User s Manual Page 9 3 3 Viewing Operating Mode Parameters The flow diagram below shows the viewable parameters that program key P is pressed Initial Display at Start Up Displays your process Dewpoint Maximum High Dewpoint since last reset To res
22. imum level for the sensor range in use dewTEC DS2000 User s Manual Page 13 i y alphamoisture 4 Disconnect the coaxial cable and re install the sensor in its normal position Reconnect the coaxial cable This procedure re confirms that the sensor is correctly calibrated to the hygrometer We recommend that verification of the overall linearity of calibration of the system should be carried out on a 12 monthly basis 4 2 Programmed Settings The dewTEC DS2000 has two setting modes that modify the hygrometers operation The modes and parameters are shown in the following table MODE PARAMETER Program Mode Calibration Data Decimal Point Position Linear Output scaling Offset Filter Communications address and baud rate Display Colour Lock Help on off Configuration Mode Alarm Mode Alarm Direction Linear Output type Totaliser Enter the mode that you require as described in this section to change a parameter NOTE Many of the parameters are factory set during manufacture test and calibration Do not change any of these settings as your hygrometer may give erroneous readings without you knowing 4 2 1 Program Mode ALM 1 ALM 2 To enter Program Mode and to exit Program Mode Y gt B dewTEC Model DS2000 DEWPOINT METER Press and hold P for 3 seconds ssxu In program mode the secondary display flashes continuously and shows a single character which identifie
23. is 22 55V The power consumption is SW 2 7 1 Mains line supply or optional DC Input An external fuse and a suitable switch or circuit breaker must protect the mains supply of the hygrometer which should be near the unit Use a 1A antisurge Fuse 315mA for 24V DC option RECOMMENDED POWER CONNECTION If the relay outputs are to be used to carry mains line voltage it is recommended that the relay mains line supply should be switched and fused in a similar manner but should be separate from the hygrometer mains line supply 2 7 2 Sensor Connection The sensor is connected to the hygrometer with the low impedance co axial cable provided This low impedance cable may be up to km long Note that the body of the sensor is not isolated It is important that the earth potential at the sensor is the same as that in the power supply earth to avoid stray pick up This is very rarely a problem but if in doubt check for a voltage between the sensor body and the sensor holder before installing the sensor 2 7 3 Alarm Relay Outputs The relay outputs of Alarm 1 and 2 are single pole double throw contacts rated at 2A resistive at 120Vac or 240Vac 50 60Hz The relay contacts are inherently isolated from the instrument and from each other 2 7 4 Linear Analogue re transmission Output A 10 bit analogue signal representing the dewpoint is re transmitted by the output which is factory preset to voltage or current output The range
24. low shows all components which could be used in a dry gas measurement application although not all the items shown will be required for every installation Care should be taken to ensure that the sample presented to the measuring sensor is not contaminated with any component that will damage contaminate or affect the sensor in a way that will impair the system accuracy 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 The sample must not contain Ammonia Chlorine Ozone or any wet acid vapours or liquid as these will permanently damage the sensor and impair calibration accuracy The flow rate although not critical to the sensor measurement 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 affected by changes in partial pressure of water vapour and these changes that are proportional to the dew frost point temperature are displayed on the hygrometer display The measuring sensor can be installed directly into the process line but this does create problem
25. n behind the panel to at least IP20 Local regulations regarding electrical installation should be rigidly observed 2 1 2 Isolation The power supply terminals and associated internal circuitry are isolated from all other parts of the eguipment in accordance with EN61010 1 for connection to a category II supply pollution degree 2 Any terminals or wiring connected to the input or output which is accessible in normal operation must only be connected to signals complying with the reguirements for Safety Extra Low Voltage SELV circuits Follow wiring instructions described later in this section 2 2 Unpacking your dewTEC DS2000 Dewpoint Meter and Sensor Once unpacked the items should be examined for any obvious external damage Any evidence of damage or mishandling should be notified to your carrier immediately The items should include dewTEC DS2000 dewpoint meter Moisture Sensor packed in a metal canister instruction manual sensor connecting cable and any optional extras if ordered The sensor is packed separately in a waterproof metal canister with desiccant to protect it from excessive moisture exposure during transit The sensor should be inspected for damage then immediately stored in its canister until ready for installation Retain the packaging for future use ensuring the sensor canister cap is tightly screwed to preserve the desiccant 2 3 Sensor Care Very special care must be taken not to damage the sensing element for
26. n this manual If this does not cure problem replace sensor amp return original for calibration Re adjust autocal as described in this manual If this does not cure problem re calibration of the system is recommended Constant Reading Condensation in Sample System Condensation will occur if the temperature of the sample system or main pipe at any point is below colder than the DP temperature of the sample gas Once having formed the sample reaching the sensor will have a DP equal to the temperature of the condensate regardless of the DP at the sample point dewTEC DS2000 User s Manual Page 21 Appendices alphamoisture sv STEMS Appendix A Product Specification 1 Display Type Height Annunciators 2 Sensor Dewpoint Range Accuracy Operating Temperature Storage Temperature Mechanical Connections Electrical Connection Approvals 3 Hygrometer Input Sampling Rate Resolution Sensor short circuit detection 4 Transistor Outputs Type 5 Relay Output 1 Contact Type Rating Lifetime Isolation 6 Relay Output 2 Contact Type Rating Lifetime Isolation 7 Linear Re Transmitted Output Ranges Available Accuracy Load Impedance 8 Serial Communications Type Data Format Physical Layer Maximum Number of zones Baud Rate 9 Performance Reference Conditions Ambient Temperature Relative Humidity Supply Voltage Operating Conditions Ambient Temperature
27. oalescing type with a drain The filter unit should be positioned as close to the sample point as practical dewTEC DS2000 User s Manual Page 4 i y alphamoisture 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 4A omitted from the system If measurements are to be taken at full line pressure and the sample is to be returned 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 Sensor 7 Sensor Holder 8 Desiccant Chamber This item is required when the sampling is to be intermittent When installed it prevents the ingress of wet air 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 SL M Sample Exhaust The exhaust can be vented to atmosphere or returned to the process line as
28. s the displayed parameter Once in Program Mode follow these instructions to view and set parameters e Press P to scroll through the program mode parameters as described in paragraph 3 3 for the operating parameters e To edit any displayed parameter press gt to enter edit mode and V to decrement any digit as described in paragraph 3 4 for setting the alarms dewTEC DS2000 User s Manual Page 14 The following table gives the program mode parameters and their sequence i y alphamoisture Primary Identifier Description Adjustment STATUS Display Flashing Range Scaling Point 1 The first sensor input value point 0 00 to Factory setting expressed as a percentage of input span which is 100 00 of Do not change used to establish a curve for scaling sensor input input span values into engineering unit values C or F q Display Point 1 The engineering unit value 19999 to Factory setting corresponding to Scaling Point 1 19999 Do not change Scaling Point 2 The first sensor input value point 0 00 to Factory setting pa expressed as a percentage of input span which is 100 00 of Do not change D used to establish a curve for scaling sensor input input span values into engineering unit values C or F Display Point 2 The engineering unit value 19999 to Factory setting corresponding to Scaling Point 2 19999 Do not change The scaling process can be
29. s with access for maintenance and calibration It is for these reasons that we recommend that the sensor be installed in a bypass fast loop or total loss sample system where the sensor is accessible without interrupting the main process flow line dewTEC DS2000 User s Manual Page 3 i y alphamoisture Piping installation Schematic Main Proces S The sample point should be on the upper surface of the horizontal pipe or from a vertical section of pipe wherever possible The sample tube should run upwards from the sample point If this is not possible then an inspection port or drain tap should be installed at the lowest point in the sample system 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 89 is sufficient as it provides good system response time within minimum flow 6mm OD 1 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 c
30. sary with a damp soft cloth The hygrometer contains no user serviceable parts Do not open the unit The rear of the unit can be dusted with a dry cloth if necessary Ensure that no voltages are present on the rear terminal when this is done The sensor body may be wiped down with a dry cloth Do not attempt to clean the sensor element as it may be damaged 6 2 Problem Guide To be checked in a safe area by a technician experienced in handling similar eguipment Problem Cause Solution Display reads Sensor cable or plug short Disconnect the sensor cable plug from the sensor and circuit if the hygrometer still reads the same repair the short circuit in the cable or plug D ha Do LUA vu l D D DO Short Circuit Sensor Disconnect the sensor cable plug from the sensor If the display now indicates or zero Apply approximately 24V DC to the sensor terminals MOMENTARILY with the sensor in a dry condition Polarity is not important but the contact must be brief or the sensor will be destroyed If this fails to clear the fault the sensor must be replaced Instrument unserviceable Disconnect sensor cable from the instrument If reading does not change return instrument for service Autocal wrongly set Re adjust autocal as described in this manual Display reads Wet Gas or free water in system Stop gas supply and switch instrument off Check drain and inspection ports in the main system and sample system Autoc
31. state whilst supplying up to 100uA each to the hygrometer transceivers in the high impedance state 2 7 7 External Autocal Control An external autocal potentiometer can be added to control the setting remotely Connect a 2kQ multi turn potentiometer 20 turn or better using a twisted pair or screened cable between pins one and three Wire the external potentiometer to increase resistance when turned clockwise Increasing the resistance will increase the display value Note to use the external control the internal control on the rear terminal needs to be turned fully clockwise see section 4 Twisted pair or screened cable 2kQ 2 3 dewTEC DS2000 User s Manual Page 8 alphamoisture 3 0 Operating Instructions This section covers day to day operation of the dewpoint meter 3 1 Start Up On power up with the sensor connected the unit will display the process value in dewpoint or PPM v if factory preset Typical warm up time is 3 minutes 3 2 Front Panel Display and Keys Primary ON when Display Alarm 1 is active ON when Alarm 2 is active SYSTEMS Secondary Display Y gt R dewTEC Medel BS2006 N Down Scroll Program Reset key key key key Normally displays the process Dewpoint Moisture value Operational programmed parameters can be viewed by pressing the Programme key P The display will Primary Display indicate the parameter description for three seconds before showing t
32. utton keys on front panel or PC optional extra Alarms Two independent fully user programmable isolated relays with open collector outputs Programmable lock out to avoid unauthorised tamper Displays maximum and minimum values Displays elapsed time from alarm condition Factory set calibration data in C F or PPM Factory set current mA OR voltage mV analogue output Isolated and user programmable to span over any range within the overall range of the sensor RS485 serial output with 1 99 address settings 90 264V 50 60Hz or 22 50V DC Universal input power supply Accuracy 2 C dewpoint or equivalent in other moisture units AUTOCAL feature for automatic calibration adjustment Sensor Features The sensor main features are Various dewpoint ranges available Range ident on sensor packaging Conditioned for long term stability Can be located up to 1km from the dewTEC DS2000 dewpoint meter connected by a low impedance coaxial cable ATEX Certified for use in potentially explosive areas with suitable Zener Barrier dewTEC DS2000 User s Manual Page 1 i y alphamoisture 2 0 Installation Instructions 2 1 Safety Information Before installation please read the safety information below 2 1 1 Warning Suitably gualified personnel must install the eguipment and care must be taken as high voltages may be present on the instrument terminals The instrument must be mounted in a position that provides protectio
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