background image

20  OI/ATS430–EN Rev. H

 | Aztec  ATS430  |  Turbidity  sensor

6.4.4  In process calibration

In process calibration is used when it is not possible to remove 
the sensor from the process to perform the calibration. In this 
calibration mode the actual sample is used to calibrate the 
sensor. 

The in process calibration takes place in two steps. During the 
first step a grab sample is taken from the process, and the 
sensor records the turbidity of the sample at that time. The 
suspended solids content of the grab sample is then measured 
in the laboratory and entered into the transmitter during the 
second step.

Due to the inherent variability of both the turbidity and 
suspended solids measurements, using a single point to 
calibrate the suspended solids measurement can lead to sudden 
jumps in the suspended solids value reported by the sensor. 
(The ATS430 sensor supports an adaptive calibration mode, 
which mitigates the occurrence of such jumps.) – refer to 
AN/ANAINST/021-EN for details of adaptive calibration.

1.

At the Calibration Type screen, use the 

  / 

 keys to 

select 

Sample Collection

 and press the 

 key (below the 

OK

 prompt):

2. Proceed to Section 6.4.5 (Sample collection) to start the 

first part of the calibration.

6.4.5 Sample collection

1.

This is the first step of the calibration. On the next screen, 
press the 

 key (below the 

Next

 prompt).

Performing this step erases any sample collection 
performed previously. Only the last sample collection 
performed is stored in the sensor.

2. On the following screen press the 

 key (below the 

Continue

 prompt) to start the data collection. The grab 

sample should be taken as close to the sensor as possible 
during this period.

The calibration process screen is displayed – the acquisition 
can be cancelled at any time during the process by pressing 
the 

 key (below the 

Abort

 prompt):

3. Once the acquisition is complete, Press the 

 key (below 

the 

Exit

 prompt) to return to the main menu.

The value of the sample turbidity is now stored.

4. Proceed to Section 6.4.6 (Sample collection) to start the 

second part of the calibration once the suspended solids 
value has been determined.

Calibration Type

Sample Collection

Cancel

OK

1-Point Cal
2-Point Cal

Collection Complete
Manual Coefficient

Collect Sample

Abort

Continue

Start Collection?

Collect Sample

Abort

PV 

   

0.000 mg/l

NTU 

  

2000 NTU

Settling-Please Wait

Collect Sample

Exit

Procedure Complete

PV 

   

0.000 mg/l

NTU 

  

2000 NTU

Содержание Aztec ATS430

Страница 1: ...featuring EZLink connection EZLink enables new or replacement sensors to be easily connected without the need to power down the transmitter For more information Publications for the associated Aztec AWT440 transmitter are available for free download from www abb com measurement see links and reference numbers below or by scanning this code search for or click on Aztec AWT440 multi input transmitte...

Страница 2: ...sor in place 11 6 2 2 Initiating the verification at the transmitter 12 6 3 Turbidity calibration 13 6 3 1 Calibration using optional calibration pot ATS400740 13 6 3 2 1 Point calibration 15 6 3 3 2 Point calibration 16 6 4 Suspended solids 17 6 4 1 Suspended solids calibration 18 6 4 2 1 Point calibration 18 6 4 3 2 Point calibration 19 6 4 4 In process calibration 20 6 4 5 Sample collection 20 ...

Страница 3: ...ordance with the information provided in this manual in accordance with relevant local regulations DANGER Formazin Formazin is a polymerisation of 2 hazardous constituents Please conduct a full risk assessment based on the supplier s safety datasheet for formazin before use Direct current supply only This symbol identifies a risk of chemical harm and indicates that only individuals qualified and t...

Страница 4: ...onnector D EZLInk connector Table 2 1 Sensor component descriptions Sensor no Body material Wiper Range ATS430 A2A1 1 m 3 2 ft cable or ATS430 A2A2 10 m 32 ft cable Stainless steel 316 Yes viton 0 to 4000 NTU ATS430 A1A1 1 m 3 2 ft cable or ATS430 A1A2 10 m 32 ft cable Stainless steel 316 No 0 to 4000 NTU ATS430 A3A1 1 m 3 2 ft cable or ATS430 A3A2 10 m 32 ft cable Titanium No 0 to 4000 NTU All se...

Страница 5: ... the sensor is submerged to at least 30 cm 11 81 in and the sensor is at least 5 cm 1 96 in away from any surface in all directions When using extension cables protect the connections using heat shrink for example HISA 18 6 PEX CL or equivalent Fig 3 1 Siting the sensor Dimensions in mm in Fig 3 2 Sensor dimensions Max 210 m 64 ft Sample surface 5 cm 1 96 in min 5 cm 1 96 in min 30 cm 11 81 in min...

Страница 6: ...unting brackets are not supplied with this kit and must be purchased separately D Open tank flanged dip mount ATS4000785 for mounting on user supplied mounting bracket E Wiper arm protective shroud assembly ATS4000725 F Flow cell pipeline mount ATS4000741 suitable for wall surface mounting includes wall mounting clip G Handrail mounting bracket swivel tilt action ATS4000762 for 1 25 in NB dip pole...

Страница 7: ...ration of the required parameters On completion the Easy Setup start screen is displayed 7 To exit Easy Setup press the key below the Exit prompt to display the Operator Page Pressing the key below the Select prompt re enters the Easy Setup level where parameters can be reviewed or modified after 1st time connection After completing the Easy Setup level pressing the or key enters the Advanced Conf...

Страница 8: ...t displayed use the keys to scroll to it Press the key below the Select prompt 3 The Sensor Setup page is displayed Ensure Sx Turb TSS is highlighted and press the key below the Select prompt The Sx Turb TSS Turbidity menu page is displayed 4 Proceed with sensor setup see Section 6 1 page 10 for parameter options IMPORTANT NOTE Perform this procedure on existing sensor s only Sensors are setup con...

Страница 9: ...eject Off Clean Interval Set the interval between cleans Off 15 mins 30 mins 45 mins 1 to 24 Hours Off Clean Mechanism None for non wiper versions Wiper for wiper versions or External The external option allows the transmitter to control an external cleaning device through the digital I O lines Note Refer to the Aztec ADS430 EZCLEAN operating instructions OI ADS430 EZCLN EN for an example of the u...

Страница 10: ...dvanced levels only Note During calibration current outputs and alarms are set to Hold automatically if Hold Outputs is enabled see below Refer to Section 6 2 page 11 to perform a sensor verification Refer to Section 6 3 page 13 to perform a turbidity calibration Refer to Section 6 4 page 17 to perform a suspended solids calibration Menu Calibrate Exit Select Menu Comment Default S1 to 4 TURB TSS ...

Страница 11: ... supplied with the kit IMPORTANT NOTE Ensure the verification tool carrier is kept clean and any dirt is removed after each use Ensure the sensor is clean of dirt and fouling prior to insertion into the verification tool step 7 Take care not to damage the surface of verification pucks When using the puck in locations where grit or sand may be present ensure the sensor is thoroughly clean before in...

Страница 12: ...OK prompt The Start Verification screen is displayed Ensure the sensor is inserted in the verification tool see Section 6 2 1 page 11 and press the key below the Continue prompt to start the verification routine To Abort verification press the key 6 The Verification progress screen is displayed If the verification process completes successfully a verification successful message Procedure Pass is d...

Страница 13: ...vel applications less than 50 NTU that use the ABB flowcell ATS4000741 The interior properties dimensions and surface finish of the flowcell and calibration pot are comparable resulting in a matched calibration For high concentration calibrations when the use of large quantities of formazine solution is not desirable The calibration pot requires only 200 ml of calibration solution Do not use the c...

Страница 14: ... When the calibration is complete withdraw sensor cap assembly H from calibration pot G Remove cap A from sensor B a combined pull and twist action is the easiest withdrawal method Rinse all items with water and dry thoroughly with tissue not supplied 7 Dispose of formazin solution safely in accordance with local regulations Fig 6 2 Calibration using the optional calibration pot 200 ml 6 76 fl oz ...

Страница 15: ...e key below the Next prompt The Turbidity Offset screen is displayed For most cases a zero offset is suitable However in situations where an offset was previously determined during a 2 point calibration it is possible to retain the previously measured offset during the 1 point calibration 6 To select the required offset press the key below the Edit prompt The Offset Remove Offset Retain Offset scr...

Страница 16: ...mplete 6 3 3 2 Point calibration 2 Solutions are used for a 2 point calibration This calibration is used when more accuracy is needed over a given range using calibration solutions at either end of the desired range 1 At the Calibrate level press the key below the Select prompt The sensor selector menu is displayed 2 Highlight the sensor to be calibrated and press the key below the Select prompt T...

Страница 17: ...ition 9 If the calibration fails a message is displayed indicating the reason for failure If the calibration is successful the final screen displays the new slope Press the key below the Exit prompt to return to the main menu The 2 point calibration is now complete 6 4 Suspended solids There are 4 possible calibration modes for suspended solids 1 Point calibration assumes that there is no zero off...

Страница 18: ...n press the key below the Edit prompt use the keys to select 1 Point Cal and press the key below the OK prompt The Suspended Solids High Solution Value screen is displayed Press Next 2 Press the key below the Next prompt to start the calibration 3 In the following screen press the key below the Edit prompt to enter the suspended solids content of the calibration sample 4 Press the key below the OK...

Страница 19: ...ation point Press the key below the Next prompt once the value is entered 5 Place the sensor in the lower calibration point and press the key below the Continue prompt The calibration process screen is displayed the calibration can be cancelled at any time during the process by pressing the key below the Abort prompt 6 On completion remove the sensor from the first calibration point clean and inse...

Страница 20: ...key below the OK prompt 2 Proceed to Section 6 4 5 Sample collection to start the first part of the calibration 6 4 5 Sample collection 1 This is the first step of the calibration On the next screen press the key below the Next prompt Performing this step erases any sample collection performed previously Only the last sample collection performed is stored in the sensor 2 On the following screen pr...

Страница 21: ...select Yes To retain the memory of the previous calibrations adaptive calibration to fine tune the existing suspended solids calibration select No 4 Press the key below the OK prompt 5 Press key below the Next prompt The Collection Complete screen is displayed This screen displays the turbidity recorded when the sample was taken read only PV field and a field TSS to enter the suspended solids valu...

Страница 22: ...ed first Refer to the AWT440 transmitter manual OI AWT440 EN for details of how to enable logs Once logs are enabled a calibration log page exists for each of the sensors connected to the transmitter To access the calibration log press the View key on the transmitter keypad the first calibration log is displayed Use the group key in the keypad to cycle through the calibration logs for each of the ...

Страница 23: ...the new wiper arm assembly 7 Align the flat in the new wiper arm assembly with the flat on wiper motor shaft C and fit the arm to the shaft ensuring the wiper blade faces the sensor end cap 8 Insert supplied feeler gauge D between the wiper arm captive O ring and the sensor end cap 9 Fit a new nyloc M3 nut and tighten until feeler gauge D is lightly pinched but can be removed without excessive for...

Страница 24: ...al Failed The last calibration failed Repeat calibration procedure Out of Range The measured turbidity is outside the specified range Wiper Expired The wiper blade is overdue for replacement Replace the wiper blade and issue wiper blade replaced command Temperature Out of Range The internal sensor temperature is outside operating limits Verify that the sample temperature is within the operating ra...

Страница 25: ...ower Consumption maximum 100 mA 24 V DC Cable Fixed length 1 or 10 m 3 28 or 32 8 ft EZLink digital sensor connector IP rating IP67 when connected Extension cable options 1 5 10 15 25 50 m 3 2 16 4 32 49 2 82 164 ft Maximum length including optional extension cable Up to 210 m 826 ft Methods ISO7027 1999 Water Quality Determination of turbidity Materials of construction Stainless steel version 316...

Страница 26: ... or 2 0 in dia handrail ATS4000762 Handrail mounting bracket Swivel Tilt for dip pole 1 25 in NB suitable for 42 or 51 mm 1 7 or 2 0 in dia handrail ATS4000763 Handrail mounting bracket Swivel Tilt for dip pole 40 mm suitable for 42 or 51 mm 1 7 or 2 0 in dia handrail ATS4000751 Pole mounting adaptor kit straight for attachment to 40 mm or 1 25 in NB pole ATS4000710 Pole mounting adaptor kit 90 fo...

Страница 27: ...s but is rather time consuming requires trained personnel and precision laboratory equipment and cannot provide results in real time It is possible to use the long known relation between the amount of solids in suspension and the turbidity of a sample to estimate in real time the suspended solids content of the sample For a given sample it is possible to build a calibration curve to convert the tu...

Страница 28: ... changes or modify the contents of this document without prior notice With regard to purchase orders the agreed particulars shall prevail ABB does not accept any responsibility whatsoever for potential errors or possible lack of information in this document We reserve all rights in this document and in the subject matter and illustrations contained therein Any reproduction disclosure to third part...

Отзывы: