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Alpha Moisture Systems SADPmini, Instruction Manual

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Alpha Moisture Systems SADPmini Instruction Manual Download Page 32

 

Page 26 of 33 

 
 

Loop Return (pin 5) 

 
 
 
 

 
 
 

 

15.2

 

Calculating Maximum Output Load (R

EXT

) 

 

 

 
 
 

 

Examples 

V

EXT

 = 12V : R

EXT

 = 350  

 

 

 

V

EXT

 = 15V : R

EXT

 = 480

V

EXT

 = 24V : R

EXT

 = 930

V

EXT

 = 28V : R

EXT

 = 1130  

16

 

RS485 Communications 

 
SAFE  AREA  ONLY  -  Connecting  unapproved  equipment  to  the  terminals  of  the  instrument 

could cause the instrument to become unsafe for use in the hazardous area and will invalidate 
the intrinsically safe certification. 

 
The RS485 Half Duplex communications signal is driven by a MAX3471 interface chip. The 
SADPminiEx connections are: - 
 

RS485 (B) 

 

Connector Pin 7 

RS485 (A) 

 

Connector Pin 1 

GND   

 

Connector Pin 8 

 

17

 

SADPminiEx Logging Software Cables and Interfaces 

 
FOR USE IN SAFE AREA ONLY 

 

 
There  are  2  types  of  interface  that  can  be  used  with  the  SADPminiEx  and  SADPminiEx 

Logging software.  

R

 EXT 

220  

0.6V 

R

EXT

 = (V

EXT

 – 0.6) - 

240 

0.02 
 

1

2

3

4

5

6

7

8

9

Viewed from solder bucket side 
RS485 (A) 
RS485 (B) 
GND 

CON066 

Summary of Contents for SADPmini

Page 1: ...Model SADPminiEx Instruction Manual Alpha Moisture Systems Alpha House 96 City Road Bradford BD8 8ES England Tel 44 1274 733100 Fax 44 1274 733200 Email mail amsytems co uk Web www amsystems co uk ...

Page 2: ...Page ii ...

Page 3: ...Page iii ...

Page 4: ...Page iv Instruction Manual For the SADPminiEx Automatic Dewpoint Hygrometer 1405 SADPminiEx User Manual doc Issue 7 2 31 10 14 ...

Page 5: ... CONDITIONING 9 7 3 PRESSURE AND FLOW CONTROL 9 7 4 PARTICULATE CONTAMINATION 9 7 5 LIQUID CONTAMINATION 10 8 SADPMINIEX INITIAL CONFIGURATION 10 9 THE NORMAL DISPLAY SCREEN 11 10 SADPMINIEX OPERATING PRINCIPLES 11 10 1 NAVIGATING THROUGH MENUS 11 10 2 ENTERING NUMERICAL DATA 11 10 3 ENTERING ALPHANUMERICAL DATA 12 10 4 SECURITY PROTECTION SCREENS 12 11 OPERATING THE SADPMINIEX 12 11 1 THE SETUP M...

Page 6: ... 15 1 SADPMINIEX 4 20MA CIRCUIT 25 15 2 CALCULATING MAXIMUM OUTPUT LOAD REXT 26 16 RS485 COMMUNICATIONS 26 17 SADPMINIEX LOGGING SOFTWARE CABLES AND INTERFACES 26 17 1 RS232 TO RS485 CABLES INTERFACE 27 17 2 USB TO RS485 CABLES INTERFACE 28 18 TECHNICAL DETAILS OF THE RS485 4 20MA CONNECTER CON066 29 19 SADPMINI PROTOCOL 30 20 INSTRUCTIONS FOR REPLACING DESICCANT IN THE SADPMINIEX 30 21 APPENDIX C...

Page 7: ...e moisture units ºC ºF ppm V ppm W ppb g m3 and lb MMSCF Pressure compensated moisture readings in 4 selectable units of pressure psig barg kg cm2g and Kpag Battery life Indicator Built in Automatic Calibration AutoCal Built in Single Point Calibration SPC On board Real Time Clock User settable security access Sample gas flow temperature indication 4 20mA Option all the Basic SADPminiEx features p...

Page 8: ...ically Safe Therefore it can be used in hazardous areas Certification ATEX II 1 G Ex ia IIC T4 Ta 20ºC to 40ºC Ex ia IIC T3 Ta 20ºC to 50ºC It is the responsibility of the user to ascertain the suitability of the SADPminiEx for use in hazardous areas Risk assessments should be performed prior to use taking into account the SADPminiEx certifications the x rating Light alloy content of the SADPminiE...

Page 9: ...is recommended that the SADPminiEx be put on charge overnight when first received the unit should be turned OFF during charging Only use the Charger supplied with SADPminiEx To attain maximum battery life the SADPminiEx should always be re charged at room temperature with the unit turned OFF The battery life hours of use from a fully charged cell will reduce when used in cold conditions 70 hours i...

Page 10: ...re of water vapour and these changes that are proportional to the dew frost point temperature are displayed on the instrument indicator 4 1 Gases to Avoid The moisture sensors are 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 ope...

Page 11: ... 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 with minimum flow 6mm OD 1 4 tube can be used where pressure drops across the 3mm tube are too high 1 2 3 4 5 6 7 8 Main Process Line Notes a The sample point should be on the upper surface of the horizontal pipe or from a vertical section of pipe wherever p...

Page 12: ...tion valve 4 into SADPminiEx line Allow the air gas to exhaust through the sample connection 9 The SADPminiEx is not flow sensitive however the sample flow needs to be enough to purge the sensor head effectively so anything less than 1 litre min would mean that the instrument would take too long to settle to a stable reading The flow should also not be so high that the gas velocity could physicall...

Page 13: ...can display moisture readings in any one of six Engineering Units and can also display pressure compensated readings The SADPminiEx should be setup as required See The Setup Menu section before progressing to take sample readings ...

Page 14: ...he moisture level present in the sampled gas The displayed moisture value will continue to change until the sensor reaches equilibrium at which point the displayed value is representative of the moisture level in the sampled gas When the test is finished push down the telescopic head fully turn off the sample flow and disconnect the sample pipe With the head in the down position the desiccant will...

Page 15: ...mple 7 3 Pressure and flow control In most cases the gas to be sampled will be at a positive pressure which will need to be reduced to atmospheric pressure At low pressures up to around 10 barg this can be done by including a simple needle valve 5 to control the flow and thereby the pressure dropping across it Ideally this would be the isolation valve 1 on the sample point thus keeping the number ...

Page 16: ...sensor It will restrict the movement of water molecules across the surface so increasing the time it takes for the sensor to come to equilibrium with the water vapour concentration around it If the liquid is hygroscopic such as glycol the buffering effect described for desiccant dust may be so great that the sensor becomes too slow to use 8 SADPminiEx Initial Configuration Each SADPminiEx is set u...

Page 17: ...ns below 10 1Navigating through Menus The SADPminiEx is predominantly menu driven To navigate around the menus use the and keys to move the cursor bar negative image through the options available within the menu and use the key to select the option required The key has no function within menu screens 10 2Entering Numerical Data The basic principle used to enter numerical values is described here T...

Page 18: ...n when entering alphanumerical data When either the or key is pressed and held the speed of scroll will increase 10 4Security Protection Screens Several of the SADPminiEx functions can be protected with security codes These are the main Setup Menu the AutoCal function and the SPC Single Point Calibration function Each of these functions can be protected with an independently activated user defined...

Page 19: ...nfirm the selection by pressing the key The SADPminiEx then requires that a numerical pressure value be entered in the selected units The display format relates to the pressure units chosen Once a pressure value is entered the SADPminiEx automatically reverts to the Exit option in the Setup Menu Note See SADPminiEx Specification for detailed information on Pressure Engineering Units Warning This f...

Page 20: ...tion rises above 20 C dewpoint The SADPminiEx can therefore be adjusted to read 20 C dewpoint on any gas with a moisture concentration wetter than 20 C dewpoint ambient air for instance thus setting the span to match the original calibration AutoCal should be operated periodically every 2 to 3 months say or can be used to verify operation of the SADPminiEx if confirmation of an unexpected result i...

Page 21: ... keys are used to set the value accordingly If a different value has been entered in this way previously the SADPminiEx will display that value rather than 20 C dewpoint Press the key when done iv The SADPminiEx will display a moving bar whilst the calibration data is modified Up to 5 mins viii Close the desiccant head when instructed to do so and press the key ix The SADPminiEx will return to the...

Page 22: ...ey iv The display asks for the SPC POINT enter the value measured for the reference gas i e 70 C in the above example using the Scroll and and keys and press the key v The display asks for the SPC VALUE enter the stated value for the reference gas i e the value that you want the SADPminiEx to read at this point 69 C in the above example using the Scroll and and keys and press the key vi The SADPmi...

Page 23: ... set Time and Date without having to enter the Set Clock function see section 9 1 8 Operation In the Setup Menu select the Time and Date option 11 1 8 Set Clock Description The Clock option allows the user set the SADPminiEx internal Real Time Clock Operation In the Setup Menu select the Set Clock option The user is prompted to enter the Date in the DD MM YY format followed by the time in the HH M...

Page 24: ...ter Exit Exit option 11 1 10 Temperature Description This function allows the user to see the current temperature within the SADPminiEx head in both ºC and ºF Operation In the Setup Menu select the Temperature option 11 1 11 Exit Description The Exit option allows the user to return to the normal display Operation In the Setup Menu select the Exit option 11 2 The Logging Menu Full logging versions...

Page 25: ... select to log data to TAG1 Also EMPTY means the TAG reference has not been defined using Create TAG and as such is not useable Each TAG can store up to 20 separate data files called data blocks Once the required TAG reference is selected the user is required to enter an interval between readings in minutes The default setting is 0 1 minutes or 6 seconds As the interval is changed the SADPminiEx d...

Page 26: ...s Pressing the and keys moves the cursor along the X axis of the graph The Moisture value printed in the middle of the X axis changes to indicate the value at the point where the cursor crosses the moisture curve Pressing the key changes the format of the displayed from tabular to graphical and visa versa The tabular display shows the TAG reference block number moisture units and 6 moisture readin...

Page 27: ...spoke references of up to 11 characters in length TAG1 is predefined and cannot be created Operation In the Logging Menu select the Create TAG option The Enter TAGS screen then allows the user to create a TAG reference by pressing the key or return to the Logging Menu by pressing the key The Create TAG screen enables the user to produce an 11 character reference using an alphanumeric editor The an...

Page 28: ... a TAG reference is deleted all the associated data blocks are also lost When a TAG reference is deleted its slot is filled with the word EMPTY TAG1 cannot be removed when deleted it is renamed back to the predefined reference of Default TAG 11 2 8 Printer LOG SAFE AREA ONLY Description This function allows the user to real time log the moisture value seen by the SADPminiEx to any ASCII thermal pr...

Page 29: ...tically reverts to the Logging Menu after 3 seconds 11 2 11 Exit Description The Exit option allows the user to return to the normal display Operation In the Logging Menu select the Exit option 12 Pressure Correction When a line pressure is entered see 9 1 2 and ºC or ºF have been selected the displayed moisture value is pressure corrected The fact that pressure correction is active is indicated b...

Page 30: ... the battery is fully charged Note The 4 20mA output should not be operated while the instrument is charging 14 Performing an AutoCal Before an AutoCal can be performed successfully the user must have a reference moisture reading This reading is entered into the SADPminiEx in the AutoCal process as the AutoCal value The AutoCal routine can be performed using a known reference gas or under ambient ...

Page 31: ... obtained Allow the sensor to stabilise so that the gas surrounding the sensor in the SADPminiEx head is representative of the reference gas moisture value Start the AutoCal routine and enter the reference gas moisture value into the SADPminiEx when asked to enter the AutoCal Value 15 SADPminiEx 4 20mA SAFE AREA ONLY Connecting unapproved equipment to the terminals of the instrument could cause th...

Page 32: ...rea and will invalidate the intrinsically safe certification The RS485 Half Duplex communications signal is driven by a MAX3471 interface chip The SADPminiEx connections are RS485 B Connector Pin 7 RS485 A Connector Pin 1 GND Connector Pin 8 17 SADPminiEx Logging Software Cables and Interfaces FOR USE IN SAFE AREA ONLY There are 2 types of interface that can be used with the SADPminiEx and SADPmin...

Page 33: ...connector marked with a B connects to a PC or Laptop serial Port using a 2 0m serial cable Part No CAB029 The connector marked with a S connects to the SADPminiEx using a 1m special cable Part No CAB032 The INT007 has a facility to connect a 12v DC power supply 2 5mm plug with positive tip This supply is only required when the PC or Laptop connected to the SADPminiEx is not able to supply 100mA Ge...

Page 34: ...fication Recommended for Windows 2000 ME and XP The Interface unit INT008 has a 9 way D type connector and a USB connector The USB connects to a PC or Laptop USB Port using a 1 8m USB cable Part No CAB031 The D type connects to the SADPminiEx using a 1m special cable Part No CAB033 Note The drivers for the USB Interface are supplied on the included CD When Windows asks for the drivers simply inser...

Page 35: ...r and 4 assorted size clamps 4 To assemble the CON066 follow the sequence below using the diagram for reference 1 Solder wires to the correct bucket pins of the D connecter see appropriate section for pinouts 16 1 for 4 20mA and 16 2 for RS485 2 Select the appropriate clamps 4 for the cable being used 3 Insert 1 half of the clamp 4 in the bottom half shell 1 4 Place the D connecter in the bottom h...

Page 36: ...nt Head from the main body of SADPminiEx 4 Remove the Desiccant Head Base O Ring 3 and keep in safe place 5 Holding the Desiccant Head with the Desiccant Base Assembly 4 on top fully unscrew the Desiccant Head Base Assembly turning it counter clockwise anti clockwise The Desiccant Head base may require slight loosening by placing in a soft jaw vice before this step is carried out Do not fully unsc...

Page 37: ...Page 31 of 33 8 Fit Desiccant Head Base O Ring 3 9 Insert Desiccant Head in the main SADPminiEx body and tightly screw in the Retaining Collar ...

Page 38: ...Page 32 of 33 ...

Page 39: ...T 020 0 ºC SPC VALUE 025 6 ºC ENTER OLD CODE 1000 SET CLOCK DATE 04 07 00 SET CLOCK DATE 13 58 00 INFORMATION Ver 1 01 Serial 10101 L Rng 80 0 H Rng 20 0 ACAL 0 00 SPC Pt 0 00 Close Desiccant Head ENTER NEW CODE 1000 PRIMARY UNITS ºC ºF ppm V ppm W ppb g m3 SET PRESSURE 000 0 barg ACAL CODE 1000 SELECT CODE SYSTEM AUTO CAL SPC SENSOR DATA EXIT These screens can be disabled by setting the security ...

Page 40: ...de Activated To Exit Warning Data for all TAG Settings Will Be Erased Erase Abort Enter TAGS Create Quit Create Tag 2 OZZY Edit Tag 2 OZZY Edit Tags 1 TAG 1 2 OZZY 3 EMPTY 4 EMPTY 5 EMPTY 6 EMPTY Delete Tag 2 YES NO Delete Tag 1 TAG 1 2 OZZY 3 EMPTY 4 EMPTY 5 EMPTY 6 EMPTY Interval Mins 0001 0 Printer Log 11 7 ºC PTS 32 To Stop DATA DELETED LOGGING STOPPED LOGGING STOPPED Unit Address 01 EXIT Thes...

Page 41: ...ith PC See Logging Software trouble shooting section 4 20mA output does not work Not a 4 20mA version see Type Label N A Upgrade unit to 4 20mA version if required Contact Alpha Unit does not read the Upper Limit when head open Unit needs AutoCal Perform AutoCal as per manual AutoCal Failure Sensor sensitivity too low Repeat AutoCal If AutoCal Fails contact supplier to replace sensor Unit always r...

Page 42: ...erature 20ºC to 50ºC Storage Temperature 20ºC to 60ºC Serial Communications logging version Type RS485 Data Format 1 Start bit 1 Stop bit No Parity and No hardware handshaking Baud Rate 9600 No of Addresses 32 Power Supply Supply Voltage 100 240VAC 50 60Hz 400mA Output 6VDC 15W Battery Cell 3 6V Li Polymer 750mAh capacity Charging Full Charge in 14 hours Only use the Charger supplied with SADPmini...

Page 43: ...Page 37 of 33 Battery capacity is quoted at room temperature The battery capacity will degrade as the ambient working temperature falls ...

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