Related Manuals for Chemtrac LCA-1
Summary of Contents for Chemtrac LCA-1
- Page 1 OPERATIONS MANUAL Models: LCA-1, LCA-2, LCA-3 Laboratory Charge Analyzer Revised 05/01/2017...
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Page 3: Table Of Contents
TABLE OF CONTENTS Contents Product Description ..........................5 General ............................5 Applications ........................... 6 1.2.1 Determining Coagulant Dosage .................... 6 1.2.2 Determining Caustic Dosage ....................6 1.2.3 Determining Polymer Dosage ....................6 1.2.4 Charge Demand ........................6 1.2.5 Determination of Isoelectric Point ..................6 1.2.6 Other Applications ......................... - Page 4 3.1.1 Introduction .......................... 13 Preparation for Sample Testing ....................17 3.2.1 Collect Raw Water Sample ....................17 3.2.2 Prepare Sample for Testing ....................18 3.2.3 Positioning Sensor into Sample ..................18 3.2.4 Sensor Conditioning & Stabilization ..................19 3.2.5 pH Measurement and Adjustment ..................19 3.2.6 Titration Procedure ......................
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Page 5: Product Description
“charge” or “charge measurement.” Streaming result. It is highly recommend to consult with current is a very small current that is generated Chemtrac’s application experts to ensure the test by the mechanical separation, or shearing, of ions procedure is optimized for plant conditions. -
Page 6: Applications
(IEP) of dispersions using an Acid or Base 1.5.1 pH and Temperature titration. The IEP is the pH at which a particular Models LCA-1 and LCA-2 can be equipped with molecule or particle carries no net electrical the pH and temperature probe option. This option charge. -
Page 7: Specifications
-pH & Temp (F/C)* -Acid/Base Dose: parts per million (ppm)* -pH of isoelectric point (optional, requires pH)* *Also available as option on LCA-1 and LCA-2 Sample Size 225 mL to 2000 mL (250 mL, 1000 ml, or 2000 ml beaker... -
Page 8: Lca Components
1.7.1 LCD Display & Menu Keypad 1.7 LCA Components Figure 4 – Display & Menu Keypad 1. Streaming current value (charge). Range -1000 to +1000 2. pH reading. Range 0 to 14 3. Elapsed time. Shows how long the titration has been running Figure 3 –... -
Page 9: Stand Release (Raise & Lowers Stand)
1.7.10 pH electrode and Temp probe utilized if desired. The pH electrode and temperature probe is optional on models LCA-1 and LCA-2, but comes 1.7.6 Coagulant / Polymer Titrant Container standard on LCA-3 They are located to the right side of the LCA’s probe. -
Page 10: User Menu
2. User Menu These menu features are only available on models LCA-2 and LCA-3. There are 3 main sections of the user menu which 2.1.2.1 Titration Control are titled: 1. Titration Setup (LCA-2 & LCA-3 only) The Charge Titration Control menu allows the 2. -
Page 11: Ph Titration (Lca-3 Only)
2.1.3 pH Titration (LCA-3 Only) sample (e.g. dosage required during rain events). This menu contains all the settings necessary for For example, if working with a raw water sample controlling the acid or base addition rate during the pH titration, as well as other functions that typically requires a coagulant dosage of 10 discussed in sections 2.1.3.1 to 2.1.3.6. -
Page 12: Calibration
reaches its neutral reading. WARNING – Setting 2.2 Calibration the Prop. Gain setting too high can cause overshooting of the Target pH and result in The calibration menu allows the user to calibrate inaccurate coagulant dosage determination. It is the Streaming Current Value (SCV). To calibrate better for the pH adjustment to be on the slower the SCV, submerge the sensor in raw water (with side as this ensures more accurate coagulant... -
Page 13: Operation
60 minute test) or using laboratory charge of this manual and email or fax back to at us 770- analysis (5 minute test). 447-0889 or chemtrac@chemtrac.com. Once your information is received, a product application Unlike online SC devices, the LCA is capable of... - Page 14 instrument’s reading very well. For example, if an requirements for a paper mill will require a lesser online SC is reading 0 on a sample taken from the degree of charge neutralization (or charge flash mix, a sample taken from the same point destabilization) as compared to drinking water as and measured by the LCA may read -20.
- Page 15 mixing time, and the incremental addition of the It is generally recommended to feed ACH and coagulant, are also not critical to the test results. PACl coagulants neat (undiluted). When doing so, it is important to pay attention to the pipette to make sure coagulant is actually flowing into the pipette (use fresh tips with each test to avoid tip 3.1.1.5 Oxidants Must be Fed to Sample if Fed...
- Page 16 The below table shows an example of “Target pH” alum to a pH <7.0 to ensure the formation of cationic aluminum species like Al(OH) testing results. Each sample had its pH modified Al(OH) When the aluminum is sufficiently with an addition of acid prior to the addition of present as cationic species, it allows for reliable coagulant, and this was referred to as the Start determination of optimum coagulant dosage...
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Page 17: Preparation For Sample Testing
As discussed in section 3.1.1.8, it is sometimes Chemtrac has several case histories where necessary to reduce the sample pH in order to plants were at first very reluctant to make the ensure accurate dosage determination. -
Page 18: Prepare Sample For Testing
3.2.2 Prepare Sample for Testing • The sample must be taken upstream of coagulant addition and not contain any Once a sample has been collected, prepare fresh coagulant. dilute solutions (e.g. 1% solutions) of treatment chemicals that are used in the coagulation step of •... -
Page 19: Sensor Conditioning & Stabilization
All models of the LCA (-1, -2, and -3) can be the black thumbscrew. Keep the sample away outfitted with a pH probe. If the LCA-1 or LCA-2 from reaching the electrical connections at the were ordered without pH, it will require the... -
Page 20: Titration Procedure
With the completion of the previously discussed target pH. steps, the sample is ready to be titrated with the coagulant. For model LCA-1 (or when feeding Below are examples of pH targets that are neat coagulant), this means manually adding the... -
Page 21: Figure 8 – Automatic Titration
which works out to 0.5 ppm per stroke dosage if using a 1% solution of coagulant and 1,000 mL samlpe size. Figure 8 – Automatic Titration... -
Page 22: Maintenance
4. Maintenance This will cause the signal health value to drop and indicate factory maintenance of the motor or drive linkage assembly is required. To prevent premature wear on 4.1 Signal Health Readout the drive linkage, it is best to only run the LCA motor as needed and not leave Located on the front display is a percent (%) running on a continuous basis. -
Page 23: Use Of Approved Cleaners
• Immediately reattach the piston to the Note: If a cleaner is used, it is important to rinse LCA being careful to only touch the top the parts thoroughly with tap water and then DI portion of the piston. • water to flush away as much of the residual Brush all surfaces of the probe below the cleaner as possible. -
Page 24: Titrant Pump Cleaning / Maintenance
4.3 Titrant Pump Cleaning / Maintenance back in one direction and the pump head has a positioning pin to prevent improper assembly. The titrant pump(s) should be flushed with DI water whenever not in use for more than 12 Reconnect the pump wires once the pump is hours. -
Page 25: Storage
Rinse the probe with clean water and then soak for a minimum of 1 hour in moving Chemtrac offers verification solutions to check (e.g. stirred) clean water to remove residual the neutral endpoint accuracy of the LCA. These solutions are labeled “Verification Solution #1 –... - Page 26 • Slowly add additional solution in 0.2 mL increments waiting several seconds between additions to see if the reading starts to change rapidly. • Once the reading starts to change rapidly, wait to see if reading crosses over the neutral endpoint before adding any additional cationic solution.
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Page 27: Application Questionnaire
Laboratory Charge Analyzer (LCA) 4.7 Application Questionnaire Pre-Application Questionnaire For each of the below items, please be sure to include the appropriate “units of measurement” (e.g. MGD, m /hr, ml/min, etc. Raw Water: • Flow Typical:______________ Min:___________________ Max:__________________ • Alkalinity Typical:______________ Min:___________________ Max:__________________ •... - Page 28 List all other chemicals (chlorine, caustic, potassium permanganate, filter aids, etc.), that are fed upstream of filtration along with their typical dosage: _________________________________________________________________________________________ _________________________________________________________________________________________ _________________________________________________________________________________________ Please provide simple plant diagram (hand sketch) that describes the process and shows points of chemical addition.
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