Teledyne 450H Setup variables VARS, Latch_Alarms, Alarm Beeper, Use Zero Valve, Azero Enable

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3.5 Setup variables (VARS)

The setup variables are global settings that can be configured by the user. Note: Do not arbitrarily change these settings since these variables affect the fundamental operation of the instrument. The setup variables are accessed from the main menu by pressing SETUP-VARS.Use the PREV or NEXT buttons to scroll to the desired variable and press EDIT to change the variable. Set the desired value for the variable and press ENTR to save the value. Pressing EXIT aborts the edit screen without changing the value. The setup variables available to the user are listed below along with their description.

0) LATCH_ALARMS

This variable sets the operation of the concentration alarms to either latched or non- latched mode. In latched mode, when a concentration alarm is triggered, the alarm will stay on, or latch, until the user resets the alarm through the ALRM menu on the front panel. When the alarms are set to non-latching mode(LATCH_ALARMS = OFF) the alarms will automatically turn off when the concentration drops back below the alarm threshold value.

1) ALARM_BEEPER

This variable enables or disables the audible beeper that sounds whenever one of the alarms has been triggered. The beeper sounds a slow beep if any of the ‘HI’ alarms are active and sounds a fast beep if any of the ‘HI-HI’ alarms are active.

Note: VAR’s 2-6 apply only to instruments with the Auto-Zero valve option

2) USE_ZERO_VALVE

This variable enables the Auto-Zero valve (if installed) during manual zero calibration (See Section X.X.)

3) AZERO_ENABLE

This variable enables the Auto-Zero function which will perform an automatic zero calibration at the interval specified by the AZERO_FREQ variable. This calibration is performed by admitting externally supplied zero gas into the measurement cell for a period of time specified by the AZERO_DWELL variable and then performing a zero calibration.

4) AZERO_CAL_ENABLE

This variable enables automatic calibation during the Auto-Zero cycle and should be set to ON whenever the Auto-Zero function is enabled.

5) AZERO_FREQ

This variable determines the frequency of the Auto-Zero function in hours. The default value is 24 hours.

6) AZERO_DWELL

P/N 02826B1 Teledyne API Model 450H O3 Monitor Instruction Manual - Page 36

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Contents MODEL 450H OZONE MONITOR EMAIL api-sales@teledyne.comPrinted 05/15/06 SAFETY MESSAGES TABLE OF CONTENTS 3.0 SETUP MODE4.0 MAINTENANCE 5.0 ADJUSTMENTSAPPENDIX A - ELECTRICAL SCHEMATIC INDEX 5.3 A/D - D/A CALIBRATION PROCEDURE…5.4 CURRENT LOOP CALIBRATION FIGURES TABLES TABLE 1.1 DIGITAL OUTPUTSTABLE 1.2 CONTROL INPUTS TABLE 1.3 FINAL TEST AND CALIBRATION VALUES1.0INTRODUCTION 1.1Preface1.2 WARRANTY POLICY ADVANCED POLLUTION INSTRUMENTATION DIVISION02024c COVERAGE1.3 Principle of Operation Page 1.4 Specifications 1.5 Installation 19” Rack Mount EnclosurePage 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 FIGURE 1.4 - ELECTRICAL SIGNAL I/O CONNECTIONS 1.6Electrical I/O Connections1.6.1Analog Output 1.6.2 Relay OutputsFIGURE 1.5 - CONNECTING DIGITAL OUTPUTS 1.6.4 Control InputsOutput Description1.6.5 RS232 Output InputCONTROL INPUTS Zero CalibrateFIGURE 1.6 - NEMA4X ASSEMBLY LAYOUT FIGURE 1.7 - M450H PNEUMATIC BLOCK DIAGRAMU V L A M P M O T H E R B V / F C P U A C L I N E D C P O W E R SOFigure 1.8 - 19” Rack Assembly Layout POWER SUPPLY MODULE1.7 Operation verification TABLE 1.3 FINAL TEST AND CALIBRATION VALUES 1.8.5 Flow Switch 1.8 Options1.8.1 Auto-ZeroOption 1.8.2 Isolated Current Output 4-20mAor 2-20mA2.1Key features 2.1.2 Concentration Alarms2.1.4 E2 ROM backup of software configuration 2.0OPERATION2.2 Front Panel Display 2.2.1 Front panel display fieldsFIGURE 2.1 - MODEL 450H FRONT PANEL Mode FieldMessage/Test Measurement Field Test MessageTEST MEASUREMENTS Warning Message2.3 Software Operation 2.2.2 Status LED’s2.3.1 Main Menu State2.3.3 Alarm Status Menu FIGURE 2.3 - ALARM STATUS MENUClearing Alarms Audible BeeperPage 3.0 SETUP MODE FIGURE 3.1 - SETUP MENU3.1 Setting the Concentration Alarms ALRM 3.2 Setting the Concentration Units UNIT3.3 Setting the time-of-dayand date CLK HI ALARM OFF3.4 Setting the RS-232baud rate COMM 3.5 Setup variables VARS 0 LATCH_ALARMS1 ALARM BEEPER 3 AZERO ENABLE8 GAS MOLECULAR WEIGHT 10 TPC ENABLE7 AZERO HOLD OFF 9 CONCENTRATION RANGE3.5Diagnostics DIAG 3.5.1Zero Calibration3.5.2 D/A Calibration 3.5.3 Analog Output4.0Maintenance 4.2Cleaning Exterior Surfaces of the M450H4.3 Cleaning the Optical Cell Filter Replacement ProcedureFIGURE 4.1 MEASUREMENT CELL DISASSEMBLY 4.4 Degree of Protection5.0 ADJUSTMENTS Switch Settings5.1 Calibration 5.2Changing the analog output range5.3 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 APPENDIX B - SPARE PARTS LIST DESCRIPTIONPage APPENDIX C - ELECTRICAL SCHEMATIC INDEX Drawing NumberTitle