Page 10Switching off the Analyser:Press the ON/OFF button to switch the analyser OFF. The display countsdown from 29 with the pump on to clear the sensors with fresh air – if theflue probe is still connected, make sure the analyser and probe are infresh air.Press the SEND/PRINT button to abort the off count down and return tomaking measurements.Note: The analyser will not switch off unless the CO reading is below40ppm.Backlight & Data Freeze:Press the backlight button for 1 second to freeze the current data on thescreen. Press the backlight button for a 1 second to disable the freezefunction.Press the backlight button for 2 seconds to switch on the analysersdisplay backlight. Press the backlight button for 2 seconds to disable thebacklight.NOTE: Use of the backlight significantly increases the current drainon the batteries.Switching the PUMP on / offThe analyser operates normally with the pump on.Press the PUMP button to witch the pump off and onWhen the pump is switched off “–PO-“ replaces the readings on the topline of the display. The analyser also displays “PUMP OFF” on the topline approximately every 40 secondsNOTE: The pump will not switch off if the CO reading is above 40ppm.This helps to protect the CO sensor from damage.The pump automatically switches itself off when the rotary dial is set toMenu, Status and Temp if the CO value is less than 40ppm.