Contents H25-IRii Instruction 3015-52863.4.2 Improving PPM Measurement Accuracy using the CAL Factor ..................................... 263.4.3 Adjusting the CAL Factor .................................................................................................. 263.5 Restoring Factory Calibration .......................................................................................................... 273.6 Storing a New Factory Calibration .................................................................................................. 274 Operation....................................................................................................................................294.1 Instrument Location ......................................................................................................................... 294.2 Using the H25-IR .............................................................................................................................. 294.2.1 Power ................................................................................................................................... 294.2.2 Initial Setup ........................................................................................................................ 294.2.3 Range Selection................................................................................................................... 304.2.4 Setup Selection ................................................................................................................... 304.2.5 Volume Adjustment ............................................................................................................ 314.2.6 Searching for a Leak...........................................................................................................314.2.7 Measuring the Leak Rate...................................................................................................324.2.8 Measuring the PPM Level..................................................................................................324.2.9 Logging Measured Readings..............................................................................................324.2.10 Logged Measurements........................................................................................................ 334.2.10.1 Viewing Logged Measurements ..................................................................... 334.2.10.2 Clearing the Log.............................................................................................. 334.2.10.3 Viewing the Total of All Logged Measurements ........................................... 344.2.10.4 Setting the Log Limit...................................................................................... 344.3 Responding to Fault Conditions ....................................................................................................... 354.4 PCHK (Atmospheric Pressure CHecK) ............................................................................................ 354.5 RS-232 Communication .................................................................................................................... 354.6 Serial Output Types .......................................................................................................................... 365 Maintenance...............................................................................................................................385.1 Diagnostics Menu .............................................................................................................................. 385.1.1 Sensor Data......................................................................................................................... 385.1.2 Last Fault............................................................................................................................ 395.1.3 IR Emitter ........................................................................................................................... 405.1.4 Pressure............................................................................................................................... 405.1.5 Loop Test ............................................................................................................................. 405.1.6 Clear Last Fault.................................................................................................................. 405.1.7 Auto Gain ............................................................................................................................ 415.2 Factory Menu..................................................................................................................................... 415.2.1 DIGIPOT ............................................................................................................................. 415.2.2 Leak Rate ............................................................................................................................ 415.2.3 Leak Gas.............................................................................................................................. 425.2.4 Leak Temp........................................................................................................................... 425.2.5 Leak TEMPCO....................................................................................................................425.2.6 Sensor Cal ........................................................................................................................... 425.2.6.1 Pressure Sensor Calibration Screen .............................................................. 425.2.6.2 Flow Rate Sensor Calibration Screen (Factory Calibration)........................ 435.2.6.3 Box Temperature Calibration Screen ............................................................ 435.2.7 Model Select ........................................................................................................................ 435.2.8 Probe Type........................................................................................................................... 445.2.9 Firmware............................................................................................................................. 445.3 Flashing Memory............................................................................................................................... 445.4 Part Replacement .............................................................................................................................. 475.4.1 Removing the Top Cover ....................................................................................................475.4.2 Fuse Replacement...............................................................................................................485.4.3 Probe Tip Filter & O-Ring Replacement ........................................................................... 485.4.4 Internal Filter Replacement .............................................................................................. 495.4.5 Optical Bench Replacement ............................................................................................... 495.4.5.1 Top Cover Removal ......................................................................................... 505.4.5.2 Installing the New IR Optical Bench............................................................. 505.4.5.3 IR Emitter Adjustment................................................................................... 515.4.5.4 DIGIPOT Adjustment .....................................................................................51