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1

TURBIDITY MEASUREMENT SYSTEMS

1.1

Introduction

An ABB Turbidity System comprises a 4670 wall-mounted, or
4675 panel-mounted, analyzer, together with one of five sensor
models 7997 200 to 7997 405.

The analyzer provides the operator interface and
communications to other devices.

The signal from the sensing system is converted by the analyzer,
and the information is presented on a large, custom-designed,
easy-to-read, backlit liquid crystal display (LCD).

The analyzers can be programmed to work with any of the 7997
sensors, and the operating range can also be configured to
meet users' requirements.

Available in a wall-mount or

1

/

4

DIN panel-mount version, the

analyzer is protected to IP66, ensuring reliable operation in the
most demanding situations. The same level of protection is
maintained during programming and calibration.

Details of the individual sensors are given in Table 1.1 below:

Table 1.1 Coding System

«
...
2
3
4
5
6
...
»

Содержание 4670 Series

Страница 1: ...Turbidity Systems 4670 Series User Guide IM 4670_13 ...

Страница 2: ...itions of high pressure and or temperature 5 Chemicals must be stored away from heat protected from temperature extremes and powders kept dry Normal safe handling procedures must be used 6 When disposing of chemicals ensure that no two chemicals are mixed Safety advice concerning the use of the equipment described in this manual or any relevant hazard data sheets where applicable may be obtained f...

Страница 3: ...CTRICAL CALIBRATION 22 6 1 Access to Secure Parameters 23 6 2 Language Page 23 6 3 Set Up Parameter Page 23 6 4 Set Up Outputs Page 25 6 5 Electrical Calibration 27 6 5 1 Equipment Required 27 6 6 Preparation 27 6 7 Electrical Calibration Page 28 7 MAINTENANCE 29 7 1 Scheduled Maintenance 29 7 1 1 Sensor Cleaning 29 7 1 2 Calibration 29 7 1 3 Using Dry Calibration Standards 29 7 2 Calibration Chec...

Страница 4: ... e h t s e t o n e d x l l a w 0 l e n a p 5 e g a u g n a l e h t s e t o n e d y h s i l g n E 1 n a m r e G 2 h c n e r F 3 h s i n a p S 4 1 TURBIDITY MEASUREMENT SYSTEMS 1 1 Introduction An ABB Turbidity System comprises a 4670 wall mounted or 4675 panel mounted analyzer together with one of five sensor models 7997 200 to 7997 405 The analyzer provides the operator interface and communication...

Страница 5: ...21y Systems 7997 200 201 4670 500 4670 22y System 7997 202 4670 500 4675 20y 21y Systems 4675 500 7997 200 201 4675 22y System 4675 500 7997 202 1 MEASUREMENT SYSTEMS 1 2 Turbidity Measurement Systems Figs 1 1A and 1 1B Fig 1 1A System Arrangements with 200 and 300 Series Sensors ...

Страница 6: ...0 500 7997 400 Series 7997 400 Series 4675 500 4670 45y Series Systems 4675 45y Series Systems 4670 500 7997 450 Series 7997 450 Series 1 MEASUREMENT SYSTEMS 1 2 Turbidity Measurement Systems Figs 1 1A and 1 1B Fig 1 1B System Arrangements with 400 and 405 Sensors ...

Страница 7: ...le to mount the instrument at eye level allowing an unrestricted view of the front panel displays and controls 2 1 2 Sensor Unit Fig 1 1A Models 7997 200 Series and 7997 300 only For easy removal of sensor unit for maintenance if required allow sufficient clearance of 200 mm 7 9 in all around see Section 2 3 1 for overall dimensions of units Note For ease of use it is recommended that the maximum ...

Страница 8: ... Secure plates 1 2 3 4 A Wall mounting B Pipe mounting 68 2 68 214 8 43 232 9 13 Fixing Centres 160 6 3 250 9 84 69 2 72 Fixing Centres Allowance for Cable Bends 200 7 9 42 1 65 61 23 8 O D Vertical or Horizontal Post Dimensions in mm in 2 MECHANICAL INSTALLATION 2 2 Mounting the Transmitter Unit 2 2 1 Wall mounted Instrument Figs 2 2 and 2 3 Fig 2 2 Overall Dimensions Fig 2 3 Wall Pipe mounting ...

Страница 9: ... anchors are located correctly in their slot Secure the instrument by tightening the panel clamp retaining screws see Caution below Loosen the retaining screw on each panel clamp Remove the panel clamp and anchors from the instrument case 1 2 3 4 5 6 3 2 MECHANICAL INSTALLATION 2 2 2 Panel mounted Instrument Figs 2 4 and 2 5 Caution The clamp must fit flat on the instrument casing If the clamp is ...

Страница 10: ...Wiper Unit Optical Emitter Optical Receiver Flow chamber Drain Valve Inlet Isolating Valve Clamping Ring Sensor Flowcell 7997 400 Dip Tube Dip Sensor Wiper Optical Emitter Optical Receiver hidden 7997 405 2 MECHANICAL INSTALLATION 2 3 Installing the Turbidity Sensor Unit Table 1 1 and Fig 2 6 Systems and sensors are shown in Table 1 1 The main components of each unit are identified in Fig 2 7 Fig ...

Страница 11: ...he maximum flow rate of 6 0 l min 1 should not be exceeded 2 3 3 7997 400 Series The dip sensor should be mounted in a position where a representative sample is always monitored i e not in an obscure corner away from the main flow path The dip tube should not be totally submerged but the sensor assembly at the end of the dip tube must always be in the sample despite any change in liquid level to e...

Страница 12: ...00 Series and 2 11 7997 00 118 Six holes 7 for mounting 155 5 46 5 Sample inlet 12 mm i d flexible hose connection Drain 12 mm i d flexible hose connection Sample outlet see Fig 2 8 for location Fig 2 10 Model 7997 400 Series Mounting Information Fig 2 9 Model 7997 300 Mounting Information Fig 2 12 Typical Installation Fig 2 11 Model 7997 405 Mounting Information SR100 Recorder Sample in Sample ou...

Страница 13: ...eadings it is recommended that these measurements be not greater than 150mm Caution To ensure adequate flowrate through the sensor it is recommended that the De bubbler unit is installed at least 0 5m above the sensor outlet This may need to be increased where long or smalll bore tubing is used 4675 Sample in Flow Regulator Valve De bubbler Drain Outlet Inlet Isolating Valve Drain 7997 200 Series ...

Страница 14: ...ion a suitably rated external protection device e g fuse or miniature circuit breaker m c b must also be fitted by the installer Before making any connections ensure that the power supply any high voltage operated control circuits and high common mode voltage are switched off 3 1 Access to Terminals 3 1 1 Wall mounted Instrument Fig 3 1 3 1 2 Panel mounted Instrument Fig 3 2 Fig 3 1 Access to Term...

Страница 15: ... be used for switching loads Retransmission output Do not exceed the maximum load specification for the selected current retransmission range see SPECIFICATION Section 8 Since the retransmission output is isolated the ve terminal must be connected to earth ground if connecting to the isolated input of another device 3 2 1 Relay Contact Protection and Interference Suppression Fig 3 3 If the relays ...

Страница 16: ...bidity Sensors 7997 400 Series 1 White 2 Yellow 3 Red 4 Green 5 6 7 Blue Turbidity Sensors 7997 200 Series 7997 300 1 White 2 Yellow 3 Red 4 Green 5 Black 6 Blue 7 Discard and insulate unused BLACK wire in multi core cable If Test Cleaner is selected Set Up Parameters Page Relay 2 becomes Failed Wiper Alarm relay Earth Stud on case Braid 3 ELECTRICAL CONNECTIONS 3 3 Wall mounted Instrument Connect...

Страница 17: ... 7997 200 Series and 300 1 2 3 4 5 6 7 8 9 E N L 1 2 3 4 5 6 7 8 9 10 11 12 Earth Stud Normally Closed Common Normally Open Normally Closed Common Normally Open Neutral Live Earth see Warning below 1 2 3 4 5 6 7 8 9 E N L Mains Supply Retransmission Output Earth Stud on case Relay 1 Relay 2 Relay 2 or Failed Wiper If Test Cleaner is selected Set Up Parameters Page Relay 2 becomes Failed Wiper Alar...

Страница 18: ...ive screw Slide instrument out of case 230 1 2 230 3 230 V AC or 110 V AC 3 ELECTRICAL CONNECTIONS 3 5 Selecting the Mains Voltage 3 5 1 Wall mounted Instrument 3 5 2 Panel mounted Instrument Information Use a small flat blade screwdriver to remove the screw cap from the case Fig 3 6 Selecting the Mains Voltage Wall mounted Instrument Fig 3 7 Selecting the Mains Voltage Panel mounted Instrument ...

Страница 19: ...ystem an extension cable is required see Section 9 4 for the part number of the cable The maximum length of cable is 100 meters An IP65 rated good quality junction box is also required to make the connection The wire colors in the extension cable are the same as those in the standard cable Make connections like to like i e red to red etc see Fig 3 9 Information If a longer cable to the 4600 Series...

Страница 20: ... Parameter 4 Advance to next parameter or New value is automatically stored or 5 0 0 Turbidity NTU Alarm LEDs Upper Display Line Lower Display Line Membrane Keys 4 CONTROLS AND DISPLAYS 4 1 Displays Fig 4 1 The display comprises a 5 digit 7 segment digital upper display line and a 16 character dot matrix lower display line The upper display line shows actual values of turbidity temperature alarm s...

Страница 21: ... at 00000 to allow access during commissioning but should be altered to a unique value known only to authorized operators in the Set Up Outputs Page see Section 6 4 5 2 1 Operating Page Measured Turbidity Value The measured turbidity is displayed These two keys are used to advance to all subsequent parameters and pages Sensor Voltage This represents the output from the optical receiver The optical...

Страница 22: ...he Dry Calibration Standard Press The display changes to Calibrating Span Press immediately to advance to Cal Complete if span calibration is not required Calibrating Span Displayed for approximately a minute after which the sequence changes to Cal Complete Calibration completed Cal Complete Calibration is now complete Cal Fail Cal Fail indicates that the expected step change between a zero and sp...

Страница 23: ...s press The display changes to Calibrating Zero Calibrating Zero Displayed for approximately one minute after which the sequence changes to Fill Span Sol Displayed for approximately one minute after which the sequence changes to Fill Span Sol Displayed for approximately one minute after which the sequence changes to Immerse Fill Span Sol Span using Formazine Standard Use the or keys to set the val...

Страница 24: ...Outputs Page Electrical Calibration Page FTU mg l Coeff Display Span 1 0 Operating Parameters Secure Parameters English 0 0 0 0 0 0 0 0 Calibrating Zero Use Dry Standard Fill Span Sol Immerse Span Sol If Dry Standard selected above Hrs If Formazine selected above 200 300 Manual Clean No Alter Cal Code 0 0 0 0 0 201 l 2 0 Formazine Std DRY CAL STD Adjust RTX Zero x x x x x mV Zero 0mV x x x x x mV ...

Страница 25: ...ts 7997 200 Series 7997 300 7997 400 Series NTU Nephelometry Units 7997 200 Series FNU Formazine Nephelometry Units 7997 200 Series FTU Formazine Turbidity Units 7997 300 and 7997 400 Series FAU Formazine Attenuation Units 7997 300 and 7997 400 Series ppm Suspended solids 7997 200 Series 7997 300 and 7997 400 Series mg l Suspended solids 7997 200 Series 7997 300 and 7997 400 Series Select the requ...

Страница 26: ... degassing of the sample is taking place causing small bubbles to form in the flowcell resulting in short duration spikes in the Turbidity reading Bubble Period Adjust the value until the spikes are no longer seen on the display The longer the duration of spike the higher the value needs to be programmable from 2 to 60 A value of 20 is probably sufficient for most applications Signal Filter Used f...

Страница 27: ...last alarm action is maintained Alarm 1 Set Point The alarm 1 set point can be set to any value within the display span selected The set point value is subject to hysteresis as detailed above Set the alarm set point to the required value Alarm 2 Action Repeat as for Alarm 1 Action above Becomes Failed Wiper Alarm if Test Cleaner is set to YES in the Set Up Parameter Page Alarm 2 Set Point Repeat a...

Страница 28: ...on range selected above The test signal selected is shown on the upper display Example for a selected range of 0 to 20 mA and 50 retransmission test signal 10 mA is transmitted Select the required retransmission test signal Alter Security Code Set the security code to a value between 00000 and 19999 This value is then reentered to gain access to the secure parameters Alter Calibration User Code Se...

Страница 29: ... current output from the electronics unit terminal block see Fig 3 4 or Fig 3 5 b Wall Mounted Instruments 1 Connect the millivolt source and to terminals 4 and 7 respectively 2 Connect the milliammeter to the retransmission output terminals 3 Ensure the earth on the millivolt source is connected to the earth stud Panel Mounted Instruments 1 Connect the millivolt source and to terminals 9 and 6 re...

Страница 30: ...eries 7997 300 Set the millivolt source to 0 mV and allow the instrument display to stabilize Millivolt Span 7997 200 Series 7997 300 Set the millivolt source to 3000 mV and allow the instrument display to stabilize Millivolt Zero 7997 400 Series Set the millivolt source to 0 mV and allow the instrument display to stabilize Millivolt Span 7997 400 Series Set the millivolt source to 4000 mV and all...

Страница 31: ...ecommended that checks are made at appropriate intervals 7 1 2 Calibration A key feature of the system is the optional Dry Calibration Standard which simplifies routine calibration and virtually eliminates the need for formazine standard solutions to be produced These dry standards are safer ensure repeatable accurate results and eliminate operator error However the software is designed to cater f...

Страница 32: ...that the lenses are dry Note If the sample was cold condensation could form on the windows It may be necessary therefore to leave the sensor open for a short while to allow the windows to reach ambient temperature before attempting calibration Note The dry calibration procedure for the 7997 300 and 7997 400 requires the use of demineralized water for zero calibration d Insert the Dry Calibration S...

Страница 33: ...may be necessary therefore to leave the sensor open for a short while to allow the windows to reach ambient temperature before attempting calibration d Close the drain valve and fill the chamber with high purity water Note the reading on the display If readings are out of spec 2 FSD repeat the procedure from c If reading is still out of spec calibrate the sensor Section 5 2 2 e Insert the Dry Cali...

Страница 34: ...g the Standard in the supplied storage container g Fit the unit into the working position and secure 7 3 Using Formazine Standard Solution 7 3 1 Preparing the Formazine Standard for Wet Calibration a Dissolve 50 0 g of hexamethylenetetramine C6H12N4 in high purity water and dilute to 400 ml Solution A Warning Hydrazine sulfate is poisonous and carcinogenic b Dissolve 5 0 g of hydrazine sulfate N2H...

Страница 35: ... to detect the correct operation of the cleaner either the cleaner did not rotate or failed to park in the correct position a Check the electrical connections to the sensor b Check the sensor 12V supplies using a suitable voltmeter both at the transmitter terminals and sensor junction box see Table 3 1 for connection details c Check operation of the cleaner unit by disconnecting the white lead fro...

Страница 36: ... is packed in the original storage container 7 4 5 Determination of the Dry Standard Value for the 7997 300 and 400 Series Sensors The dry standards supplied with the 7997 300 and 7997 400 series of systems are instrument specific Therefore if a replacement dry standard is purchased or if one has been purchased subsequent to delivery of the system then the value of the standard has to be determine...

Страница 37: ... to 50 C 32 to 122 F Sample Pressure Up to 3 bar 43 5 psi 7997 201 7997 202 Turbidity Sensors Range Programmable 0 1 NTU to 0 30 NTU Measurement Principle 90 scattered light measurement Compliant to ISO7027 Measurement Characteristic Linear based on Formazine Resolution 0 01 NTU Repeatability Better than 1 of span Accuracy 2 FSD limited by uncertainty in Formazine standards Temperature drift 0 005...

Страница 38: ... 400 7997 401 Dip 7997 405 Flow Turbidity Sensors Range Programmable 0 100 to 0 1000 FTU and 0 2000mg l Extended Range 0 to 2000 FTU Measurement Principle Transmitted light Measurement Characteristic Logarithmic based on Formazine Resolution 1 FTU Repeatability Better than 1 of span Accuracy 0 to 1000 FTU 2 FSD limited by the uncertainty of Formazine Accuracy 0 to 2000 FTU Better than 10 of span T...

Страница 39: ...riation from nominal supply Insulation Mains to earth line to ground 2kV RMS Relay Outputs and Set Points No of relays Two Relay contacts Single pole changeover Rating 250V AC 250V DC max 3A AC 3A DC max Loading non inductive 750VA 30W max inductive 750VA 3W max Insulation 2kV RMS contacts to earth ground No of set points Two Set point adjustment Programmable Set point hysteresis 1 fixed Local set...

Страница 40: ... e d r o e b y a m l e G a c i l i S 4 6 4 7 1 2 0 2 e l u d o M g n i n a e l C t i K e d a r g p U e l u d o M g n i n a e l C 1 0 2 7 9 9 7 o t 2 0 2 7 9 9 7 m o r f e d a r g p U 0 8 0 7 9 9 7 6 9 1 7 9 9 7 4 3 U T N 0 3 o t 0 e g n a R w o L t i K r e v i e c e R r e t t i m E 1 8 1 7 9 9 7 4 3 U T N 0 5 2 o t 0 e g n a R h g i H t i K r e v i e c e R r e t t i m E 2 8 1 7 9 9 7 5 e d a l B r...

Страница 41: ... a m s g n i r O 8 3 1 1 1 2 0 3 f f o 2 r o t c e n n o C t i f k c i u Q 1 1 5 7 9 9 7 Probe 1 2 3 m e t I n o i t p i r c s e D o N t r a P 1 d r a d n a t S n o i t a r b i l a C y r D y l e t a r a p e s d e r e d r o e b y a m l e G a c i l i S 4 6 4 7 1 2 0 2 f f o 2 s e d a l b r e p i W 3 3 1 7 9 9 7 3 e e s e l b a C n o i s n e t x E e t o N 3 9 g i F n i 8 2 8 3 3 2 0 9 SPARES 9 3 Mode...

Страница 42: ...d and scattered before reaching the detector A1 2 Absorption 7997 300 and 7997 400 Series systems use the principle of absorption through the sample and is shown diagrammatically in Fig A2 Absorption turbidimeters called absorptiometers direct a light source into the sample where particles absorb and scatter a proportion of the light Some of the light passes straight through the sample to a detect...

Страница 43: ...en carry out the following operations 1 On Set Up Parameter page select mg l 2 Enter a FTU to mg l correction factor of 1 0 3 Take a note of the on line value 4 Take a grab sample for analysis to determine the true suspended solid value 5 Obtain the correction factor by dividing the analyzed value by the on line value e g if analyzed value 150 and on line value 100 divide 150 by 100 1 5 the correc...

Страница 44: ...ENDIX C C1 7997 100 Sensors C1 1 Description This sensor no longer available It has been replaced by the 7997 201 and 7997 202 sensors It is included here to provide information for users of existing 7997 100 sensors Thesensorisdesignedtooperateatverylowturbidityvaluesoflessthan 0 1 NTU At these very low turbidity values it is most important that additional sources of light scattering are eliminat...

Страница 45: ...00 3 Red 4 Green 7 Blue and Black Braid Earth Stud on case see Fig 3 1 Retrans Output 1 2 3 4 5 6 NC C NO NC C NO Relay 1 Relay 2 APPENDIX C C1 3 Wall mounted Instrument Connections Fig C3 Note Refer to Fig 3 1 for Access to Terminals Caution Slacken terminal screws fully before making connections Warning The power supply earth ground must be connected to ensure safety to personnel reduction of th...

Страница 46: ... below Relay 1 Relay 2 1 2 3 4 5 6 7 8 9 E N L Mains Supply Retransmission Output Earth Stud on case Braid APPENDIX C C1 4 Panel mounted Instrument Connections Fig C4 Note Refer to Fig 3 2 for Access to Terminals Caution Slacken terminal screws fully before making connections Warning The power supply earth ground must be connected to ensure safety to personnel reduction of the effects of RFI and c...

Страница 47: ... tube 12 mm i d Drain tube 6 mm i d Fix the sensor to a vertical surface APPENDIX C C1 5 Turbidity Unit Connection Box Fig C5 Turbidity Unit Connection Box Information If a longer cable to the 4600 Series unit is to be fitted remove the existing cable and replace it making the appropriate connections shown here and in Fig 3 4 or 3 5 To allow better access to the junction box unscrew and remove the...

Страница 48: ...T P S B 5 1 5 6 1 2 0 APPENDIX C C1 6 Maintenance C1 7 Spares Sensor Cleaning The Model 7997 100 sensor unit is generally used on clean water samples and maintenance should be limited mainly to manual monthly cleaning of the flow chamber under normal conditions If there is a high turbidity breakthrough clean the chamber immediately to ensure accurate readings Calibration Calibration can be carried...

Страница 49: ...47 NOTES ...

Страница 50: ...48 NOTES ...

Страница 51: ...trumentation pH conductivity and dissolved oxygen transmitters and sensors ammonia nitrate phosphate silica sodium chloride fluoride dissolved oxygen and hydrazine analyzers Zirconia oxygen analyzers katharometers hydrogen purity and purge gas monitors thermal conductivity Customer Support We provide a comprehensive after sales service via a Worldwide Service Organization Contact one of the follow...

Страница 52: ...without notice Printed in UK 08 04 ABB 2004 ABB Limited Oldends Lane Stonehouse Gloucestershire GL10 3TA UK Tel 44 0 1453 826661 Fax 44 0 1453 829671 ABB Inc Analytical Instruments 9716 S Virginia St Ste E Reno Nevada 89521 USA Tel 1 775 850 4800 Fax 1 775 850 4808 ABB has Sales Customer Support expertise in over 100 countries worldwide www abb com ...

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