Teledyne 450H 4.0Maintenance, 4.1Replacing the gas filter element, Cleaning the Optical Cell

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4.0Maintenance

4.0Maintenance

4.1Replacing the gas filter element

The Model 450H comes equipped with a gas filter on the ozone inlet. These filters accept 25mm diameter glass fiber elements. Only filter elements of borosilicate glass or quartz fibers should be used. When the instrument is first installed, the sample filters should be checked at least once a week for particulate loading and replaced if necessary. Once the replacement frequency is determined, a regular schedule for filter replacement should be instituted.

For replacement 25mm filter elements, please contact Teledyne API’s sales department and request part number 02851.

Filter Replacement Procedure:

1.First ensure that the gas delivery line is not under pressure and has been purged of ozone.

2.Remove the four nuts securing the gas filter assembly.

3.Remove the bottom half of the filter housing

4.Examine the internal sealing o-ring and replace if necessary.

5.Pull out the stainless steel screen securing the filter element.

6.The element can now be removed and replaced. When re-assembling filter, make sure that the top stainless steel screen is pushed into the filter cavity, securing the element in place.

7.After re-assembly, the gas line should be pressurized with oxygen or dry air and checked for leaks using a bubble solution.

4.2Cleaning Exterior Surfaces of the M450H

If necessary, the exterior surfaces of M450H can be cleaned with a damp cloth. Do not attempt to clean any of the other surfaces of the instrument. Do not submerge any part of the instrument in water or cleaning solution.

4.3 Cleaning the Optical Cell

Over long periods of time the optical cell windows in the sensor assembly may become dirty and affect the operation of the instrument. Each time a zero calibration is done, the instrument can detect changes in the light transmission through the windows and will issue a warning when this value drops to an unacceptable level. The warning message “Optical Cell Warning” will be issued on the front panel and the “Cell Dirty” status output(See Section 1.6.3) will be turned on. The cell assembly should then be cleaned to avoid any degradation in measurement accuracy of the M450H.

P/N 02826B1 Teledyne API Model 450H O3 Monitor Instruction Manual - Page 39

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Contents MODEL 450H OZONE MONITOR EMAIL api-sales@teledyne.comPrinted 05/15/06 SAFETY MESSAGES 5.0 ADJUSTMENTS TABLE OF CONTENTS3.0 SETUP MODE 4.0 MAINTENANCEAPPENDIX A - ELECTRICAL SCHEMATIC INDEX 5.3 A/D - D/A CALIBRATION PROCEDURE…5.4 CURRENT LOOP CALIBRATION FIGURES TABLE 1.3 FINAL TEST AND CALIBRATION VALUES TABLESTABLE 1.1 DIGITAL OUTPUTS TABLE 1.2 CONTROL INPUTS1.1Preface 1.0INTRODUCTIONCOVERAGE 1.2 WARRANTY POLICYADVANCED POLLUTION INSTRUMENTATION DIVISION 02024c1.3 Principle of Operation Page 1.5 Installation 19” Rack Mount Enclosure 1.4 SpecificationsPage 5.If the M450H has been configured with the auto-zerovalve option, connect the oxygen or other zero gas source to the ¼” tube fitting labeled ‘Zero Gas Inlet.’ Do not exceed 30 psig in the zero air delivery line 1.6 Installation NEMA 4X Wall Mount Enclosure ozone FIGURE 1.1 - NEMA 4X MOUNTING HOLE DIMENSIONS FIGURE 1.2 - NEMA 4X ELECTRICAL POWER CONNECTIONS FIGURE 1.3 - NEMA 4X PNEUMATIC CONNECTIONS 1.6.2 Relay Outputs FIGURE 1.4 - ELECTRICAL SIGNAL I/O CONNECTIONS1.6Electrical I/O Connections 1.6.1Analog OutputDescription FIGURE 1.5 - CONNECTING DIGITAL OUTPUTS1.6.4 Control Inputs OutputZero Calibrate 1.6.5 RS232 OutputInput CONTROL INPUTSD C P O W E R SO FIGURE 1.6 - NEMA4X ASSEMBLY LAYOUTFIGURE 1.7 - M450H PNEUMATIC BLOCK DIAGRAM U V L A M P M O T H E R B V / F C P U A C L I N EPOWER SUPPLY MODULE Figure 1.8 - 19” Rack Assembly Layout1.7 Operation verification TABLE 1.3 FINAL TEST AND CALIBRATION VALUES 1.8.2 Isolated Current Output 4-20mAor 2-20mA 1.8.5 Flow Switch1.8 Options 1.8.1 Auto-ZeroOption2.0OPERATION 2.1Key features2.1.2 Concentration Alarms 2.1.4 E2 ROM backup of software configurationMode Field 2.2 Front Panel Display2.2.1 Front panel display fields FIGURE 2.1 - MODEL 450H FRONT PANELWarning Message Message/Test Measurement FieldTest Message TEST MEASUREMENTSState 2.3 Software Operation2.2.2 Status LED’s 2.3.1 Main MenuAudible Beeper 2.3.3 Alarm Status MenuFIGURE 2.3 - ALARM STATUS MENU Clearing AlarmsPage FIGURE 3.1 - SETUP MENU 3.0 SETUP MODEHI ALARM OFF 3.1 Setting the Concentration Alarms ALRM3.2 Setting the Concentration Units UNIT 3.3 Setting the time-of-dayand date CLK3.4 Setting the RS-232baud rate COMM 3 AZERO ENABLE 3.5 Setup variables VARS0 LATCH_ALARMS 1 ALARM BEEPER9 CONCENTRATION RANGE 8 GAS MOLECULAR WEIGHT10 TPC ENABLE 7 AZERO HOLD OFF3.5.3 Analog Output 3.5Diagnostics DIAG3.5.1Zero Calibration 3.5.2 D/A CalibrationFilter Replacement Procedure 4.0Maintenance4.2Cleaning Exterior Surfaces of the M450H 4.3 Cleaning the Optical Cell4.4 Degree of Protection FIGURE 4.1 MEASUREMENT CELL DISASSEMBLY5.2Changing the analog output range 5.0 ADJUSTMENTSSwitch Settings 5.1 Calibration5.3 A/D - D/A Calibration Procedure 1.Press SETUP-DIAGFIGURE 4.2- ANALOG OUTPUT JUMPERS 5.4 Current Loop Calibration zero point can be adjusted anywhere between 0 and 4 milliamps. Press ENTR when you have reached the desired zero point as measured by your test meter APPENDIX A - SOFTWARE MENU TREE Page DESCRIPTION APPENDIX B - SPARE PARTS LISTPage APPENDIX C - ELECTRICAL SCHEMATIC INDEX Drawing NumberTitle