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Related Manuals for In-situ ChemScan mini UV254
Summary of Contents for In-situ ChemScan mini UV254
- Page 1 ChemScan ® mini UV254 Analyzer Installation, Operation and Maintenance Manual Rev: June 10, 2020 ENTER ChemScan mini ChemScan, Inc. 2325 Parklawn Drive Suite I Waukesha WI 53186 PH: 262-717-9500 FAX: 262-717-9530 ChemScan.com...
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Page 2: Table Of Contents
Table of Contents ChemScan mini UV254 Analyzer Analyzer Description Installation and Adjustment ........................... Safety Installation Diagram ................Sample Delivery Suggestions Diagram Startup Procedure Verify Fluid Connections Power-Up ..........................Initial Zero Configuration Variables Menu Structure ........................... Menu Table Analyzer Maintenance Maintenance Schedule ................... -
Page 3: Chemscan Mini Uv254 Analyzer
Detector Sample Light Source F#254OPDG3 ChemScan mini UV254 Analyzer Analyzer Description The ChemScan UV254 is a photometric analyzer designed to measure light absorbance (or light transmittance) at 254 nm wavelength in water samples. The sample flows continuously through the analyzer’s flow-cell except during the auto-zero and auto-cleaning cycles. -
Page 4: Installation And Adjustment
Installation and Adjustment This analyzer is intended for indoor installation in a temperature-controlled environment. Additional environmental requirements can be found in the technical specification. Select an installation location for the analyzer that can accommodate the pressurized sample required. The installation location should have space for the zeroing and cleaning containers below the analyzer and allow easy access to the analyzer for maintenance. -
Page 5: Installation Diagram
19.0 LITER (9.5 Liter) CONTAINER 10" x 10" x 17" 11x14x7" ChemScan mini UV254 Analyzer WEIGHT: 27 lbs (12.25 kg) DIMENSIONS: 26.0 x 10.0 x 6.5" DEEP, (660 x 254 x 165 mm) POWER: 100 - 240 VAC, 50 / 60 Hz, 1 AMP... -
Page 6: Sample Delivery Suggestions Diagram
66.00" (1676 mm) Mounting height above floor level for typical installation - NOT TO SCALE- IN-LINE 36.00" STRAINER WITH CLEAR (914 mm) BOWL .25" DIA. (6.4mm) MANIFOLD BLOCK (4 HOLES) Sample Outlet to open drain via optional, 5 psi (35 kPa) Gray PVC Check Valve 1/4 NPT Tube Fitting Sample Inlet:... -
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: Configuration Variables
Configuration Variables Hidden option, key [9] from the main menu screen, provides the installer a series of configuration options not visible to the operator. Use the [+] and [-] keys to scroll through the options. The current value is displayed, and a new value may be entered at the cursor. To store a new value, press the [ENTER] key. -
Page 9: 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 10 UV254 Menu Structure MAIN MENU 1) ONLINE 2) ZERO 1) MANUAL ZERO 2) AUTO ZERO 3) CLEAN 1) AUTO 2) MANUAL 4) SETUP 1) ZERO 1) ZERO TIME 2) ZERO INTERVAL 2) PARAM 1) 254 ABS 3) CLOCK 2) % T 4) OUTPUT 1) SETUP OUTPUTS 2) FORCE OUTPUTS...
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Page 11: Analyzer Maintenance
Analyzer Maintenance The analyzer has been designed to minimize the total amount of maintenance time. Typically, the analyzer requires less than 2 hours of maintenance per month. Always use safe practices when handling chemicals and avoid exposure to analyzer's UV light. Maintenance Schedule Routine maintenance of the UV254 Analyzer is limited to a few periodic procedures as follows: Daily... -
Page 12: Maintenance Procedures Interrupting
Maintenance Procedures The following pages describe the routine maintenance procedures. Additional maintenance details can be found in Appendix "A". 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. - Page 13 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 5 gallon (19.5 liter) zeroing solution container is provided with the analyzer.
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Page 14: 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 an Auto-Zeroing Operation on a preset interval (as set in the SETUP menu). However, it is important to periodically perform a Manual Zero Operation to track the indicator numbers. -
Page 15: Manual Chemical Cleaning Procedure
Manual Chemical Cleaning Procedure Over time the windows in the flow-cell may foul, reducing the light level. For most applications the flow- cell windows must be cleaned occasionally to insure adequate light through the sample. This is typically handled automatically with the analyzer's auto-clean feature. However, the process can be performed manually from the keypad by flushing the flow-cell and tubes with the cleaning solution, (dilute HCl) and rezeroing the instrument. - Page 16 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 reading is below the specified range, perform a mechanical cleaning procedure.
- Page 17 Figure 5...
- Page 18 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. Use care to ensure the o-ring is installed and fully seated in the o-ring groove prior to reassembling the window plates. 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 19: Retrieving Log Data From The Analyzer
Retrieving Log Data from the Analyzer * (alternative, simplified procedure follows on page 26) The analyzer stores approximately 5,000 log entries. Log entries are made up of events (online, offline, zeroing operations, data readings, etc.), which are time-stamped and stored in non-volatile memory. Memory retention time without power applied is approximately 100 years. -
Page 20: Analyzer Self-Diagnostics And Error Messages
Analyzer Self-Diagnostics and Error Messages MAINTENANCE REQUIRED message: The UV254 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. -
Page 21: 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 Components Unstable Test Zero Fouled Flow-Cell Chemically Clean Flow-Cell Readings Bubbles/Air in Flow-Cell Check Plumbing for Air Leaks / Install 5 psi Check Valve Light Levels Too Low Fouled Flow-Cell... -
Page 22: Appendix "A" Addendae
Appendix “A” Addendae: 1. 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 23: Cleaning Head Replacement
Appendix "A" - Additional Maintenance Items Cleaning Head Replacement Items Required: • Long nose pliers • Paper towel • New pump head Prepare the analyzer for internal maintenance by turning off AC power to the analyzer and turning the sample valve off. 2. -
Page 24: Cleaning Pump Replacement
Cleaning Pump Replacement 1. Interrupt on-line operation and close the sample line valve. 2. Unplug the pump from the power hub by pulling on the plastic connector. NOTE: DO NOT pull on wires 3. Loosen the captive mounting screws and remove the pump assembly from the sample manifold. -
Page 25: Sample Valve Replacement
Sample Valve Replacement 1. Interrupt on-line operation and close the sample line valve. 2. Loosen the center Phillips head screw and remove the electrical connector and the red gasket. 3. Unscrew the two Phillips head screws and remove the old valve. NOTE: Don’t remove the torx screws (red paint). -
Page 26: Simplified Data Download Procedure
Simplified Data Download Procedure Internal Data Log The analyzer stores approximately 5,000 log entries. Log entries are made up of events (data readings, cleaning operations, analyzer online/offline, etc.), and are time-stamped and stored in nonvolatile memory. Log entries may be downloaded using the analyzer’s serial channel. -
Page 27: Technical Specification
Pub # 206 Rev: 5/19/20 ® ChemScan mini UV254 Analyzer TECHNICAL SPECIFICATION FUNCTIONS AND OUTPUTS Measurement Principle High Resolution, Ultraviolet Absorbance @ 254nm Number of Parameters Parameter Options Absorbance Units, % Transmittance Data Communications 4 - 20mA, RS-232 MODBUS RTU Data Log 10,000 Values Time/Date Stamped (optional) Auto Zeroing... -
Page 28: Menu Structure With Comments
MENU STRUCTURE with Comments for Reference 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 –... - Page 29 ChemScan UV-254 Analyzer Modbus Communication - Rev: 12/20/19 COMMUNICATION PORT CONNECTION: Female DB-9 on main circuit card connect with straight-thru cable to PC pin 2: TX pin 3: RX pin 5: GND Default Settings: 9600 baud (2400,4800,9600,19200,38000) 8 bits 1 stop bit no parity Serial Setup Settings are available by entering the configuration menu (press '9' when analyzer is off-line).
- Page 30 Instrument data is available in 4 registers. Register 0 – Operation Flags Description Comments POWER flag Always 1 ONLINE flag Set when online. Maintenance Required Set when the analyzer requires maintenance. flag Alarm output should also be set. AutoClean flag Set when AutoClean is running.
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Page 31: Operator's Screen Guide
ChemScan mini UV254 Analyzer Operators's Screen Guide Default Keys Description Display Name Notes: Value Sequence OnLine Starts Continuous Readings Normal operating mode ONLINE Place "Offline" with [MAIN MENU] key OFFLINE Main Menu Zero Zero 2/1/ Zero performed automatically Auto 2/1/1 Factory set value on DI water 3.137 V 3.117 V Zero performed manually Manual 2/1/2 Factory set value on DI water... - Page 32 ChemScan mini UV254 Analyzer Technician's Diagnostic Screen Guide Notes Keys Description Diagnostics Mode Scroll Using +/‐ Default Number of attempts to clean flow-cell Press [9] Key from Main Menu Screen If %T is still too low, Error Message is Sent MAX CLEAN ATTEMPTS 9/+ (1x) Runs autoclean sequence 3x Time the sample is flushed after Clean,Zero Sample Refill Time - Seconds 9/+ (2x)
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Page 33: Maintenance Notes
Maintenance Notes:... - Page 34 Maintenance Notes:...
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