ToxiRAE Pro User’s Guide4815. Diagnostic ModeIn Diagnostic Mode, the ToxiRAE Pro provides raw counts for sensor, battery, and otherreadings. Most of these screens are useful only to service technicians. Therefore, if yourequire information on Diagnostic Mode, refer to the ToxiRAE Pro Service Guide.The ToxiRAE Pro’s Diagnostic Mode can only be accessed at startup time. In DiagnosticMode, ToxiRAE Pro displays readings in raw counts instead of units such as parts per million(ppm).15.1. Entering Diagnostic Mode1. With the ToxiRAE Pro turned off, press and hold both [MODE] and [Y/+].2. When the display turns on and the password screen appears, release the keys.3. Enter the 4-digit password (the password is the same as the one for theProgramming Mode):• Step from one position in the four-character string to the other by pressing[MODE].• Press [Y/+] repeatedly to select a desired number. Numbers increase from 0 to 9.• Once 9 is reached, pressing [Y/+] again “wraps” around back to 0.4. When you are done, press [MODE] until either OK or Cancel is selected. Press[Y/+] to register the password (if “OK” is highlighted) or to exit without enteringthe password (if “Cancel” is selected).15.2. Navigating Diagnostic ModeStep through Diagnostic Mode by pressing [MODE].15.3. Exiting Diagnostic Mode1. Turn off the ToxiRAE Pro by pressing and holding [MODE]. There will be astandard shutoff countdown.2. When the instrument shuts off, you will be alerted. Release your finger.Note: The next time you start ToxiRAE Pro, hold only [MODE], and it willautomatically start in Normal Mode.