Table of Contents
Related Manuals for ASA Electronics ChemScan mini UV254
Summary of Contents for ASA Electronics ChemScan mini UV254
- Page 1 ChemScan ® mini UV254 Analyzer Installation, Operation and Maintenance Manual ASA, Inc. Applied Spectrometry Associates, Inc. 2325 Parklawn Drive Suite I Waukesha WI 53186 PH: 262-717-9500 FAX: 262-717-9530 ASAAnalytics.com...
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Page 2: Table Of Contents
Table of Contents ChemScan mini UV254 Analyzer Analyzer Description Installation and Adjustment Safety Startup Procedure Verify Fluid Connections Power-Up Initial Zero Calibrating to Match Reference Device Menu Structure Analyzer Maintenance Maintenance Schedule Maintenance Procedures Interrupting On-Line Operation Sample Line Screens... -
Page 3: Chemscan Mini Uv254 Analyzer
ChemScan mini UV254 Analyzer Analyzer Description The ChemScan UV254 is a photometric analyzer designed to measure light absorbance or light transmittance at a wavelength of 254 nm in liquid samples across a fixed path length in a flow through cell. -
Page 4: Installation And Adjustment
Installation and Adjustment The UV254 Analyzer is supplied with mounting feet as shown in Figure 2. The analyzer should be mounted securely to an indoor wall or other suitable structure using appropriate fasteners and washers. Indoor installation is recommended because ambient temperature cycles can cause optical instability or freeze the zeroing and cleaning solutions. - Page 5 Figure 2...
- Page 6 Figure 3...
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Page 7: Startup Procedure
Startup Procedure Verify Fluid Connections Sample, Cleaning and Zeroing connections must be installed as indicated on the installation drawing. Connections must be firm and vacuum-tight; air drawn into the system will cause erroneous readings. Power-Up With proper connection made to 110/240 VAC, turn the analyzer ON by pressing the red power switch located behind the front panel. -
Page 8: Calibrating To Match Reference Device
Calibrating to Match Reference Device % Transmittance is a unit-less measurement ranging from 100% (the sample is absorbing no light) and 0% (the sample is opaque). If the instrument was properly zeroed, then in principle the %T reading should match that delivered by any other device. In fact, however, %T is also affected by the nature of the optical path involved, the size of the absorbing/scattering particles, and other implementation factors. - Page 9 Configuration Variables Hidden option (9) from the main menu screen offers the installer a series of parameters. Use the + and - keys to scroll through the options. The current value is displayed, and a new value may be entered at the cursor.
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Page 10: Menu Structure
Menu Structure The analyzer is equipped with an operator interface consisting of a display and keypad. The operational parameters can be adjusted through the operator interface. NOTE: Whenever a “+” is displayed in the lower right of the display, use the + key to display more menu choices. A complete menu structure table can be found at the end of this section. - Page 11 MENU STRUCTURE MAIN 1) ONLINE CONTINUOUS MONITORING 2) ZERO -outputs are frozen at last online reading display reflects current analysis 1) ZERO 1) AUTO -triggers the automatic zeroing cycle. 2) MANUAL -press + to start flow of zeroing solution, press – to stop. ENTER to read zero. 3) CLEAN -outputs are frozen at last online reading 1) AUTO...
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Page 12: Analyzer Maintenance
Analyzer Maintenance The analyzer has been design to minimize the total amount of maintenance time. Typically the analyzer requires less than 2 hours of maintenance per month. Maintenance Schedule Routine maintenance of the UV254 series analyzer is limited to a few periodic procedures as follows: Daily - Observe operation looking for abnormal operation Weekly... -
Page 13: Maintenance Procedures
Maintenance Procedures The following pages are procedures describing the routine maintenance operations. Interrupting On-Line Operation To interrupt on-line operation the “Main Menu” key is pressed. If a security code is programmed, the following message will appear: ENTER SECURITY CODE Enter the security code followed by the ENTER key. The display will to return to the Main Menu. If an invalid security code is entered or if the entry of the code takes longer than 30 seconds, the following message will be displayed for 5 seconds: INVALID SECURITY CODE... -
Page 14: Solution Replacement
Solution Replacement Zeroing Solution The analyzer will automatically perform a zeroing operation at a preset interval. The zeroing solution is typically deionized or distilled water. The zeroing solution must contain no nitrate, nitrite, iron or organics. A 20-liter zeroing solution container is provided with the analyzer. Cleaning Solution While the analyzer is performing an autozero, it will test the need for cleaning the flow cell. -
Page 15: Manual Instrument Zeroing Procedure
Manual Instrument Zeroing Procedure The ChemScan UV254 Analyzer must be zeroed occasionally to correct for drift and flow cell fouling. The analyzer will automatically perform a zero on a regular basis (as set in the SETUP menu). However it is important to periodically perform a Manual Zero Operation to track the indicator numbers. -
Page 16: Manual Chemical Cleaning Procedure
Manual Chemical Cleaning Procedure The ChemScan UV254 Analyzer uses ultraviolet light to measure chemicals. Over time the windows in the flow cell may foul. The flow cell windows must be cleaned occasionally to insure strong light signal through the sample. This can be accomplished by simply flushing the flow cell and tubes with a mild acid rinsing the cleaning solution out and zeroing the instrument. -
Page 17: Mechanical Cleaning Procedure
Mechanical Cleaning Procedure Occasionally the automatic cleaning of the flow cell will not remove enough of the fouling on the flow cell windows. If the analyzer readings are erratic or the chemical cleaning solution is being consumed more rapidly than normal, perform the MANUAL ZEROING PROCEDURE. If the zero is below the specified range, perform a mechanical cleaning. - Page 18 Figure 5...
- Page 19 Assembling and Mounting the Flow Cell Assembly 1) Mount the window plates to the flow cell body with the larger window against the o-rings and the cover plate mounting holes facing the same direction. Be sure the o-ring is installed and fully compressed. Note: Tighten the four window plate screws in an alternating sequence to evenly compress the o-ring and avoid breakage of the windows.
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Page 20: Retrieving Log Data From The Analyzer
Retrieving Log Data From the Analyzer The analyzer stores about 15,000 log entries. Log entries are made up of events (going online, going offline, zeroing operations, data readings, etc.), which are time stamped and stored in nonvolatile memory. Retention time without power applied is approximately 100 years. Log entries may be read out using the analyzer’s serial channel. -
Page 21: Analyzer Self-Diagnostics And Error Messages
Analyzer Self-Diagnostics and Error Messages MAINTENANCE REQUIRED message: The UV0254 Analyzer performs an autozero at predetermined intervals. As the deionized water is measured, the light intensity values are monitored. If the light intensity values fall below the preset value, the system will attempt to chemically clean the flow cell. This process will be repeated up to 3 times. If the intensity values are still too low, the ALL CYCLE FAILED CLEAN CELL MANUALLY message will be flashed on the display. -
Page 22: Analyzer Troubleshooting Guide
Analyzer Troubleshooting Guide Symptom Cause Action No Flow/ Plugged Strainer or Valve Replace Strainer or Open Valve Inadequate Flow Plugged Line or Clear Obstruction or Replace Valve Plugged Items Unstable Test Zero Fouled Cell Chemically Clean Cell Readings Bubbles/Air in Flow Cell Check Plumbing for Air Leaks Light Levels Too Low Fouled Cell... -
Page 23: Addendae
ADDENDAE: ALARM 2 RELAY: This output has been linked in software to the zero/clean valve. Whenever the analyzer stops the normal sample flow, this relay is activated. This may be used to turn off an external sample pump, keeping it from dead-heading. Or it may be used to provide remote indication that the analyzer is in the zero/clean cycle. -
Page 24: Analyzer Error Messages
Analyzer Error Messages: MODE: ANALYZER ON-LINE MESSAGE: [ ] [ALARM TRIPPED] : Flashing message indicating that the concentration set point has been reached, triggering the alarm relay. [ AZC CYCLE FAILED] [CLEAN CELL MANUALLY] : Auto Zero, Clean Cycle Failed – Displayed following an unsuccessful AZC Cycle [AUTOCLEAN FAILED] [AUTOZERO FAILED] : Flashing error messages, indicating a previous clean/zero failure. -
Page 25: Replacement Parts List
ChemScan ® UV254 REPLACEMENT PARTS LIST Analyzer Upper Enclosure CONTROLLER CIRCUIT BOARD $750.00 24vdc POWER SUPPLY MODULE $265.00 2-line DISPLAY $25.00 KEYPAD $100.00 Analyzer Lower Enclosure VALVE (zero or clean) $383.00 PUMP $442.00 LAMP HOUSING MODULE $950.00 UV SOURCE MODULE $950.00 FLOWCELL ASSEMBLY $550.00...
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