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41

MODEL CLARITY II

SECTION 6.0

CALIBRATION

6.5 LAMP CALIBRATION

6.5.1 Purpose

Turbidity is a measure of the amount of light scattered by small particles suspended in a liquid. Turbidity depends
on both the quantity of particles in the sample and the intensity of the light used to make the measurement. In
USEPA-compliant turbidity sensors the light source is a tungsten filament lamp. As the lamp ages, the intensity
gradually drops. This means that the measured turbidity will decrease even though the amount of suspended par-
ticles remained constant. To correct for source drift, a photodiode in the sensor continuously monitors the intensi-
ty of the light source. However, if the lamp intensity gets too low, the correction is no longer valid. When this hap-
pens, the analyzer displays a

NeedCal

warning message. Calibrating at this point will cause the analyzer to

increase the current supplied to the lamp, thus bringing the intensity into the range where the correction is valid.

For best results and to ensure the measurement meets specifications, the sensor should be calibrated using either
slope or standard calibration. However, if turbidity standards are not available and

if an error as much as 5% can

be tolerated

, the sensor can be calibrated using lamp calibration.

Lamp calibration is not available and is not needed with ISO-compliant sensors.

6.5.2 Procedure

1.

Place the sensor in either the measuring chamber or calibration cup.

C

Ca

al

li

ib

br

ra

at

te

e

Hold

Program

Display

Slope

Grab

Standard

L

La

am

mp

p

Calibrating
Please wait . . .

Lamp Calibration
Done

Calibration
Error

2. Press the MENU key. The main menu appears. Choose

Calibrate

.

3. If the analyzer has dual input choose

Sen1

(sensor 1) or

Sen2

(sensor 2).

If the analyzer has single input, choose

Sensor

.

4. Choose

Calibrate

.

5. Choose

Lamp

.

6. This screen appears while the analyzer adjusts the lamp current.

7.

If the calibration is successful, the screen at left appears.

8.

If the analyzer is unable to adjust the lamp current sufficiently to bring the
lamp intensity into the normal range, the Calibration Error screen
appears. The lamp should be replaced as soon as possible.

9.

To return to the main display, press MENU then EXIT.

Calibrate?

S

Se

en

ns

so

or

r

Output

Calibrate?

S

Se

en

n1

1

Sen2

Output

C

Ca

al

li

ib

br

ra

at

te

e

Enter TSS Data

>>

«
...
47
48
49
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51
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»

Summary of Contents for Clarity II

Page 1: ...Clarity II Turbidimeter Turbidity Measurement System Instruction Manual PN 51 T1055 rev I February 2006 ...

Page 2: ...the protection provided by it against hazards may be impaired WARNINGS RISK OF ELECTRICAL SHOCK Equipment protected throughout by double insulation Installation of cable connections and servicing of this product require access to shock hazard voltage levels Main power and relay contacts wired to separate power source must be disconnected before servicing Do not operate or energize instrument with ...

Page 3: ... Insert the plug into the appropriate receptacle on the circuit board f Adjust the cable slack in the enclosure and tighten the cable nut For the wall pipe mount version be sure to leave sufficient cable in the enclosure to avoid stress on the cable and connections g Plug the cable into the back of the sensor h Place the sensor in either the measuring chamber or the calibration cup The sensor must...

Page 4: ... 6 0 The outputs and alarms are assigned to default values To change settings refer to Section 5 0 Programming the Analyzer To reinstall factory settings and return to Quick Start see Section 5 9 of sensors One T Tw wo o Sensor2 is for T Tu ur rb bi id di it ty y TSS Sensor1 is for T Tu ur rb bi id di it ty y TSS Units N NT TU U FTU FNU Units p pp pm m mg L none 4 Once connections are secured and ...

Page 5: ...QUICK REFERENCE GUIDE MENU TREE FOR TURBIDITY TSS MEASUREMENTS ...

Page 6: ...tted to reflect the Emerson documentation style and updated to reflect any changes in the product offering D 1 05 Updated ordering matrix added lamp calibration section revised information screens section E 3 05 Revised panel mount drawing F 7 05 Revised text on pp 32 34 revised text figure on page 46 G 10 05 Revised text on pp 9 47 and drawings on pp 10 48 to show new molded debubbler revised deb...

Page 7: ...ing Alarms and Assigning Setpoints 23 5 5 Choosing Turbidity or Total Suspended Solids 26 5 6 Choosing Single Sensor or Dual Sensor Input 29 5 7 Setting a Security Code 30 5 8 Noise Rejection 30 5 9 Resetting Factory Default Settings 31 5 10 Selecting a Default Screen Language and Screen Contrast 32 6 0 CALIBRATION 34 6 1 Introduction 34 6 2 Calibrating Against a User Prepared Standard 34 6 3 Cali...

Page 8: ... Incendive Field Wiring CSA T1055 11 15 4 1 Displays During Normal Operation 16 4 2 Solu Comp II Keypad 16 5 1 Assigning Outputs 1 and 2 in a dual input instrument 17 5 2 High Alarm Logic 19 5 3 Low Alarm Logic 19 5 4 Turbidity Sensor General 22 5 5 Turbidity Sensor EPA 180 1 22 5 6 Turbidity Sensor ISO 7027 23 6 1 Calibration Against a User Prepared Standard 30 6 2 Converting Turbidity to TSS 39 ...

Page 9: ...SO 7027 sensors use a near infrared LED For regulatory monitoring in the United States USEPA 180 1 sensors must be used Regulatory agencies in other countries may have different requirements The Clarity II turbidimeter consists of an analyzer which accepts either one or two sensors the sensors themselves and a debubbler measuring chamber and cable for each sensor The cable plugs into the sensor an...

Page 10: ...user selectable Output Accuracy 0 05 mA Alarms Optional alarm relay board includes three alarms Alarm 3 can be configured as a fault alarm in stead of a process alarm Each relay can be configured independent ly Alarm logic low or high and dead band are user pro grammable Relays Form C single pole double throw epoxy sealed Alarm Board Ratings Field wiring terminals removable terminal blocks for pow...

Page 11: ...e foot from high voltage conductors Be sure there is easy access to the analyzer 4 Do not run AC power and relay wiring through the top conduit openings Keep AC power and relay wiring separate from other wiring in the analyzer after installation 5 The analyzer is suitable for panel pipe or surface mounting Refer to the table below 6 See Section 3 1 for removal of conduit knockouts 7 To reduce the ...

Page 12: ...DEL CLARITY II SECTION 2 0 INSTALLATION FIGURE 2 1 Panel Mount Installation Access to the wiring terminals is through the rear cover Four screws hold the cover in place 2 2 2 Panel Mounting MILLIMETER INCH ...

Page 13: ...E 2 2 Pipe Mount Installation The front panel is hinged at the bottom The panel swings down for access to the wiring terminals 2 2 3 Pipe Mounting MILLIMETER INCH MODEL CLARITY II SECTION 2 0 INSTALLATION 5 ...

Page 14: ...CLARITY II SECTION 2 0 INSTALLATION FIGURE 2 3 Surface Mount Installation The front panel is hinged at the bottom The panel swings down for access to the wiring terminals 2 2 4 Surface Mounting MILLIMETER INCH ...

Page 15: ...g 308 kPa abs inlet pressure The amount of pressure in the debubbler can be estimated from the flow rate See Table 2 1 To control and monitor sample flow a valved rotameter with fittings is available PN 24103 00 Attach the rotameter to the debubbler outlet The rotameter can also be used to increase back pressure on the debubbler if additional pressure is needed to prevent outgassing MODEL CLARITY ...

Page 16: ...8 FIGURE 2 4 Debubbler and Flow Chamber INCH MILLIMETER MODEL CLARITY II SECTION 2 0 INSTALLATION ...

Page 17: ...are keyed for proper alignment 2 5 SAMPLE POINT Locate the sample tap to minimize pickup of sediment or air See Figure 2 6 If possible install a sampling port that extends one or two inches 25 50 mm into the pipe Use inch OD rigid plastic tubing Avoid soft plastic tubing if possible To reduce sample lag time install the debubbler and flow chamber as close to the sample tap as possible FIGURE 2 6 S...

Page 18: ...ontinue the process until the knockout falls out Use a small knife blade to remove the flash from the inside of the hole 3 2 POWER ALARM OUTPUT AND SENSOR CONNECTIONS 3 2 1 General Information The analyzer is available in two mounting configurations The positions of the power alarm output and sensor ter minal blocks are different in each See Figure 3 2 panel mount or Figure 3 3 pipe wall mount To ...

Page 19: ...tch or breaker to disconnect the analyzer from the main power supply Install the switch or breaker near the analyzer and label it as the disconnecting device for the analyzer Keep sensor and output signal wiring separate from power wiring Do not run sensor and power wiring in the same conduit or close together in a cable tray For best EMI RFI protection use shielded output signal cable enclosed in...

Page 20: ... FIELD WIRING INSTALLATION FM T1055 10 1400311 C NONE THIS DOCUMENT IS CERTIFIED BY REV REV REV REV REV REV REVISIONS NOT PERMITTED W O AGENCY APPROVAL FM C SENSOR CABLE IS SHIELDED METAL CONDUIT SENSOR 2 CLARITY II TURBIDITY SENSOR 1 CLARITY II TURBIDITY POWER SUPPLY 3 OPTIONAL 115 230 VAC SENSOR CABLE IS SHIELDED METAL CONDUIT ALARM WIRING VAC OPTIONAL UNCLASSIFIED AREA HAZARDOUS AREA T1055 10 M...

Page 21: ...ELD WIRING INSTALLATION FM T1055 11 1400312 C NONE THIS DOCUMENT IS CERTIFIED BY REV REV REV REV REV REV REVISIONS NOT PERMITTED W O AGENCY APPROVAL FM C SENSOR CABLE IS SHIELDED METAL CONDUIT SENSOR 2 CLARITY II TURBIDITY SENSOR 1 CLARITY II TURBIDITY POWER SUPPLY 3 OPTIONAL 115 230 VAC SENSOR CABLE IS SHIELDED METAL CONDUIT ALARM WIRING VAC OPTIONAL UNCLASSIFIED AREA HAZARDOUS AREA T1055 11 META...

Page 22: ...13 C NONE THIS DOCUMENT IS CERTIFIED BY REV REV REV REV REV REV REVISIONS NOT PERMITTED W O AGENCY APPROVAL CSA C NON INCENDIVE FIELD WIRING ALLOWED METAL CONDUIT SENSOR 2 CLARITY II TURBIDITY SENSOR 1 CLARITY II TURBIDITY POWER SUPPLY 3 OPTIONAL 115 230 VAC NON INCENDIVE FIELD WIRING ALLOWED METAL CONDUIT ALARM WIRING VAC OPTIONAL UNCLASSIFIED AREA HAZARDOUS AREA T1055 10 METAL CONDUIT ANALOG OUT...

Page 23: ...C NONE THIS DOCUMENT IS CERTIFIED BY REV REV REV REV REV REV REVISIONS NOT PERMITTED W O AGENCY APPROVAL CSA C NON INCENDIVE FIELD WIRING ALLOWED METAL CONDUIT 5 MAX CABLE LENGTH IS 50 FEET 4 DURING INSTALLATION LEAVE MAXIMUM AMOUNT OF JACKET INSULATION POSSIBLE ON N I FIELD WIRING WITHIN INSTRUMENT ENCLOSURE AFTER TERMINATION WRAP N I FIELD WIRING WITHIN ENCLOSURE WITH MYLAR TAPE TO ENSURE ADEQUA...

Page 24: ...urrent output for sensor 1 If the ana lyzer had been configured to measure total suspended solids TSS the units displayed would be ppm or mg L TSS units are user selectable Screen B shows the turbidity measured by sensor 1 S1 in the first line and the turbidity measured by sensor 2 S2 in the second line Although screens A and B are probably the most useful other displays are available For example ...

Page 25: ...zer this screen does not appear Instead the screen in step 7 appears 7 The screen shown at left appears Out1 S1 in the top line means output 1 Out1 is assigned to sensor 1 S1 For a dual input analyzer either output can be assigned to either sensor sensor and output assignments are made under the Output Configure menu shown in step 5 Use the Out1 S1 Range screen to assign a turbidity value to the 4...

Page 26: ... 4 5 USING HOLD 4 5 1 Purpose The analyzer output is always proportional to measured turbidity To prevent unwanted alarms and improper oper ation of control systems place the analyzer in hold before removing the sensor for calibration and maintenance Be sure to remove the analyzer from hold once calibration is complete During hold both outputs remain at the last value Once in hold the analyzer rem...

Page 27: ...he following page To change a default setting refer to the section list ed in the table To reset default settings see Section 5 9 5 2 CHANGING STARTUP SETTINGS When the Solu Comp II is powered up for the first time startup screens appear The screens prompt the user to identify the number of sensors being used the measurement turbidity or TSS and the units If incorrect settings were entered at star...

Page 28: ...measurement range and units section turbidity 0 2 NTU 5 3 TSS 0 100 ppm 5 3 2 OUTPUT RANGES assigned to dampening mA range section output 1 sensor 1 off 4 20 5 3 output 2 sensor 2 off 4 20 5 3 3 ALARM CONFIGURATION AND SETPOINTS alarm 1 2 3 section assigned to sensor 1 sensor 2 fault 5 4 high or low high high 5 4 deadband 0 0 5 4 setpoint turbidity high 2 0 low 0 0 high 2 0 low 0 0 5 4 setpoint TS...

Page 29: ...ning values to the low 0 or 4 mA and high 20 mA outputs 5 3 2 Definitions 1 CURRENT OUTPUTS The analyzer provides either a continuous 4 20 mA or 0 20 mA output current directly proportional to turbidity or TSS 2 ASSIGNING OUTPUTS Figure 5 1 shows the ways in which the outputs can be assigned in a dual input ana lyzer The single input analyzer has only one output 3 DAMPEN Output dampening smooths o...

Page 30: ...ng To choose a menu item move the cursor to the item and press ENTER To store a number or setting press ENTER 1 Press MENU The main menu screen appears Choose Program 2 Choose Outputs 3 Choose Output Range 4 Choose Output1 or Output2 This screen appears only in instruments having dual input 5 Make the appropriate settings a Assign a value to the low current 0 mA or 4 mA output b Assign a value to ...

Page 31: ...L1 AL2 and AL3 Alarms 1 and 2 can be assigned to any sensor For example AL1 and AL2 can be assigned to sensor 1 with perhaps one alarm configured as a high alarm and the other as a low alarm and AL3 can be assigned to sensor 2 Alarm 3 can be assigned to either sensor or used as a fault alarm The fault alarm activates when a fault exists in a sensor or the analyzer 3 FAULT ALARM A fault condition e...

Page 32: ...dband 7 The display returns to the Alarm Configure screen Select another alarm or press EXIT to return to the previous screen To return to the main display press MENU followed by EXIT 8 For AL3 a Choose Sensor1 Sensor2 or Fault b For Sensor1 select High or Low and set the deadband c Choosing Fault means AL3 will activate when a sensor or analyzer fault exists There is no user setting to make 9 The...

Page 33: ...e configuration The alarm is for Sensor 1 S1 and the logic is high Use the arrow keys to change the alarm setpoint 6 The display returns to the Select Alarm screen Select another alarm or press EXIT to return to the previous screen To return to the main display press MENU followed by EXIT Calibrate Hold P Pr ro og gr ra am m Display A Al la ar rm m S Se et tp po oi in nt ts s Alarm Configure Selec...

Page 34: ...hed ISO 7027 EPA Method 180 1 must be used for reporting pur poses in the United States Figure 5 5 shows an EPA 180 1 turbidimeter Figure 5 6 shows an ISO 7027 turbidimeter EPA Method 180 1 requires that A The light source be a tungsten lamp operat ed with a filament temperature between 2200 and 2700 K B The detector have optimum response between 400 and 600 nm approximates the human eye C The sca...

Page 35: ...velength for the measurement they tend to be more sensitive to larger particles than EPA 180 1 turbidimeters Turbidities measured using the EPA and ISO methods will be different 2 TOTAL SUSPENDED SOLIDS Total suspended solids TSS is a measure of the total mass of particles in a sample It is determined by filtering a volume of sample and weighing the mass of dried residue retained on the filter Bec...

Page 36: ...ing 7 Choose the desired signal averaging For most applications 20 sec is suitable 8 The display returns to the screen in step 6 Choose Bubble Rejection 9 Choose On to enable bubble rejection software Choose Off to disable 10 Press EXIT to return to the previous screen To return to the main display press MENU followed by EXIT Calibrate Hold P Pr ro og gr ra am m Display SensorN is for T Tu ur rb b...

Page 37: ...RAMMING 5 6 2 Procedure To choose a menu item move the cursor to the item and press ENTER To store a number or setting press ENTER 1 Press MENU The main menu screen appears Choose Program 2 Choose 3 Choose Sensors 4 Choose One or Two Changing from Two to One will cause some set tings to change NOTE If One sensor is selected only S1 will be available 5 The display returns to the screen in step 3 To...

Page 38: ...esetAnalyzer O Ou ut tp pu ut ts s Alarms Measurement S Se en ns so or rs s Security 5 7 SETTING A SECURITY CODE 5 7 1 Purpose This section describes how to set a security code The security code prevents program and calibration settings from accidentally being changed Refer to Section 4 4 for additional information 5 7 2 Procedure To choose a menu item move the cursor to the item and press ENTER T...

Page 39: ...To store a number or setting press ENTER 1 Press MENU The main menu screen appears Choose Program 2 Choose 3 Choose 4 Choose ResetAnalyzer 5 Choose Yes or No If Yes is selected previous settings are cleared and the Quick Start Menu appears N No oi is se e R Re ej je ec ct ti io on n ResetAnalyzer Load factory settings Y Ye es s No O Ou ut tp pu ut ts s Alarms Measurement S Se en ns so or rs s Secu...

Page 40: ...ogram D Di is sp pl la ay y Default Display D Di is sa ab bl le e W Wa ar rn n Disable Warning Messages Y N N 5 10 SELECTING A DEFAULT SCREEN LANGUAGE AND SCREEN CONTRAST 5 10 1 Purpose This section describes how to do the following 1 set a default display screen The default display screen is the screen shown during normal operation The Solu Comp II allows the user to customize the default display...

Page 41: ...s MENU followed by EXIT Calibrate Hold Program D Di is sp pl la ay y Language C Co on nt tr ra as st t Screen Contrast 5 50 0 5 10 4 Procedure Choosing a Language 1 Press MENU The main menu screen appears Choose Display 2 Choose 3 Choose Language 4 Choose English Français Español Deutsch Italiano or Portugues 5 The display returns to the screen in step 2 To return to the main menu press MENU To re...

Page 42: ...ation works Before beginning the calibration the analyzer does a dark current meas urement Dark current is the signal generated by the detector when no light is falling on it The analyzer subtracts the dark current from the raw scattered light signal and converts the result to turbidity In highly filtered samples which scatter little light the dark current can be a substantial amount of the signal...

Page 43: ...ty is at the upper end of the scale 100 NTU calibrate at 200 NTU For users who do not have the appropriate volumetric glassware a kit containing 4000 NTU standard a vol umetric flask and a pipet is available PN 060 761855 3 Rinse the calibration cup several times with filtered deionized water Fill the calibration cup with filtered de ionized water to the level of the groove cut inside the cup 4 Re...

Page 44: ... 20 0 NTU standard based on the previous calibration Stabilizing flashes until the reading is stable 15 Once the reading is stable the screen at left appears The turbidity value in the first line is the apparent turbidity based on the previous calibration The turbidity value in the second line is the measured turbidity at the time the reading became stable Use the arrow keys to change the turbidit...

Page 45: ...ement Dark current is the signal gen erated by the detector even when no light is falling on it The analyzer subtracts the dark current from the raw scat tered light signal and converts the result to turbidity In highly filtered samples which scatter little light the dark current can be a substantial amount of the signal generated by the sensor 6 3 2 Procedure 1 Rinse the calibration cup several t...

Page 46: ... The screen at left shows the calibration was successful Press ENTER The display returns to one of the screens in step 4 To return to the main display press MENU then EXIT 12 If a calibration error occurred one of the screens at left appears Calibration error means that zero was entered in step 10 the analyz er attempted to divide by zero Slope too high or Slope too low implies the wrong value was...

Page 47: ...p appears in this screen refer to Section 6 5 6 The screen at left appears for two seconds 7 The first line shows the sample turbidity based on the current calibration If the reading is stable press ENTER 8 Take a grab sample of the liquid and press ENTER The analyzer saves the sensor reading Measure the turbidity using the referee instrument If the grab sample test results are more than about 20 ...

Page 48: ... by the Clarity II For additional troubleshooting information see Section 8 3 3 If Calibration error is showing the analyzer retains the existing calibration To attempt a recalibration press ENTER The display returns to step 5 If Slope too high or Slope too low is showing choose Yes to update the calibration or choose No to repeat the calibration 11 This screen appears when the calibration is comp...

Page 49: ... the sensor should be calibrated using either slope or standard calibration However if turbidity standards are not available and if an error as much as 5 can be tolerated the sensor can be calibrated using lamp calibration Lamp calibration is not available and is not needed with ISO compliant sensors 6 5 2 Procedure 1 Place the sensor in either the measuring chamber or calibration cup C Ca al li i...

Page 50: ... NOTE Different sensors in the same dry check will give slightly different readings Similarly a single sensor tested in different dry checks will give slightly different readings If you are using different sensors and different dry checks be sure to keep track of which sensor was tested in which dry standard 4 Periodically check the operation by putting the sensor be sure it is completely dry in t...

Page 51: ...curacy of the measurement depends on how linear the actual relationship between TSS and turbidity is At a minimum the user should confirm linearity by diluting the most turbid sample P2 and verifying that the new tur bidity and TSS point lies reasonably close to the line Ideally the dilution should be done with filtered sample not deionized water Deionized water can change the index of refraction ...

Page 52: ... turbidity for point 1 Press ENTER 7 The display prompts the user to enter TSS for point 2 Pt2 Press ENTER 8 The display prompts the user to enter the turbidity for point 2 Press ENTER 9 The screen at left appears if the calibration was successful Press ENTER 10 If the calibration was unsuccessful the screen at left appears Repeat steps 6 through 9 checking for data entry errors 11 If the intercep...

Page 53: ... across the out put terminals Use the arrow keys to change the reading in the second line to match the current measured by the ammeter 5 Connect a calibrated milli ammeter across the out put terminals Use the arrow keys to change the reading in the second line to match the current measured by the ammeter 6 The display returns to the screen in step 2 To return to the main display press MENU then EX...

Page 54: ... for information only Screws cannot be purchased from Rosemount Analytical Shipping weights are rounded up to the nearest whole lb or 0 5 kg SECTION 7 0 MAINTENANCE 7 1 SOLU COMP II ANALYZER The Solu Comp II analyzer used in the Clarity II turbidimeter needs little routine maintenance Clean the analyzer case and front panel by wiping it with a clean soft cloth dampened with water ONLY Do not use s...

Page 55: ... lb 0 5 kg screws 6 x 1 75 in and four O rings TABLE 7 2 Replacement Parts for Solu Comp II Pipe Surface Mount Version FIGURE 7 2 Exploded View of Solu Comp II Pipe Surface Mount Version Note Information about the size of screws and O rings is for information only Screws and O rings cannot be purchased from Rosemount Analytical Shipping weights are rounded up to the nearest whole lb or 0 5 kg MODE...

Page 56: ...disconnect the cable NOTE If you have a dual input analyzer you can reapply power at this point The initial reading from the other sensor will be momentarily zero After about 60 seconds the reading will reach its final value 3 Using a small Phillips screwdriver remove the two screws holding the top flange of the sensor to the body 4 Using a slight back and forth twisting motion careful ly pull the...

Page 57: ...ew the orifice from the debub bler body See Figure 7 4 3 Use a stream of water to flush out any residue accumulated in the orifice Direct the stream of water counter to the normal flow through the orifice 4 If the material plugging the orifice cannot be removed with flushing use a toothpick or a stiff wire to push out the obstruction Push counter to the normal flow through the orifice 5 Reinstall ...

Page 58: ...compliant 8 0108 0003 ISO 1 Debubbler housing 34015 00 2 Upper cap for debubbler 34014 00 3 Lower cap for debubbler 34014 01 4 Sensor nut 34014 02 5 Pipe plug 1 4 inch MNPT 2 places 3000854 6 Orifice assembly 33947 00 7 Sample inlet elbow 1 4 in compression fitting x 1 4 in MNPT 9321010 8 Sample drain elbow 3 8 in barb x 1 4 in MNPT 9322036 9 O ring one each for upper and lower caps 9550316 not sh...

Page 59: ...2 1 Lamp LED Failure The light source in a Clarity II turbidity sensor can be either a tungsten filament lamp or an LED USEPA compli ant sensors use a tungsten lamp ISO compliant sensors use an LED A photodiode inside the sensor continuously monitors the intensity of the light source The source intensity measurement is used to correct for source drift which allows the sensor to operate for longer ...

Page 60: ...Need Cal The Clarity II sensor contains two photodiodes One measures the intensity of the light scattered by the sample The other measures the intensity of the lamp Because turbidity is proportional to the intensity of light falling on the sample photodiode any reduction of the lamp intensity will be measured as a decrease in turbidity even though the true turbidity remained constant The analyzer ...

Page 61: ... in the standard F Was the correct turbidity value entered in the analyzer 8 3 2 Calibration Error Commercial Standard Section 6 3 A For best results calibrate using 20 0 NTU standard B Has the calibration standard exceeded its expiration date C Are the lamp and detector windows clean See Section 7 2 1 D Is the sensor is securely seated in calibration cup with no light leaking in Putting a dark cl...

Page 62: ... in the sample and blocks scattered light from reaching the detector Upward drift is usually caused by bubbles adhering to the lamp or detector windows The bubbles which act like lenses direct light onto the detector and increase the apparent turbidity reading Once the bubbles get large enough they break away from the surface of the detector and the turbidity reading drops A If downward drift is o...

Page 63: ...ection 7 3 B If removing the orifice causes outgassing the symptom of outgassing is an upward drift in apparent turbid ity increase the back pressure by a small amount Use a valve or a valved rotameter PN 24103 00 in the debubbler outlet Do not exceed 30 psig 308 kPa abs C If outgassing continues to persist increase the back pressure To maintain flow use a pump to increase the inlet pressure 8 4 5...

Page 64: ...ors the screen at left appears The first line is the output from the detector monitoring the intensity of the tungsten lamp As the lamp ages the detector output drops The second line has two pieces of data lamp current and detector tem perature a The lamp current is typically either 228 mA or 257 mA Older lamps rev A operate at 228 mA Newer lamps rev B operate at 257 mA As a lamp ages and intensit...

Page 65: ...The second line is the lower limit for the turbidity measurement A meas ured turbidity below this value will return a negative TSS value 6 This screen shows the value of the analog output corresponding to the displayed value and the scaling programmed in Section 5 3 4 7 This screen shows the software version SN XXXppm NTU Low lim XXX XNTU Out1 SN 14 67mA Out2 SN 14 67mA Solu Comp II Version 3 13 ...

Page 66: ...he unit must be supplied 3 Carefully package the materials and enclose your Letter of Transmittal see Warranty If possible pack the materials in the same manner as they were received 4 Send the package prepaid to Emerson Process Management Liquid Division 2400 Barranca Parkway Irvine CA 92606 Attn Factory Repair RMA No ____________ Mark the package Returned for Repair Model No ____ 9 3 NON WARRANT...

Page 67: ... in step 1 Thoroughly mix the sample before withdrawing liquid A magnetic stirrer is best but inverting the sample repeatedly for about a minute works too Avoid violent shaking or mixing Refer to any standard reference work on water and wastewater testing for the procedure for determining TSS 4 Dilute the sample from step 1 by a factor of 0 9 0 7 0 5 0 3 and 0 1 See the table for recommended vol u...

Page 68: ...agreed upon in writing in advance by an authorized Seller representative All costs of dismantling reinstallation and freight and the time and expenses of Seller s per sonnel for site travel and diagnosis under this warranty clause shall be borne by Buyer unless accepted in writing by Seller Goods repaired and parts replaced during the warranty period shall be in warranty for the remainder of the o...

Page 69: ...N LINE ORDERING NOW AVAILABLE ON OUR WEB SITE http www raihome com Specifications subject to change without notice Emerson Process Management Liquid Division 2400 Barranca Parkway Irvine CA 92606 USA Tel 949 757 8500 Fax 949 474 7250 http www raihome com Rosemount Analytical Inc 2006 ...

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