CO Clear
User Manual
Int. Approved
Document ref: ACO-810-28
October 2018
Page 18 of 24
Copyright © 2006 Analox Ltd. All Rights Reserved.
Commercial in Confidence
10.3
Zero calibration
NOTE:
WHEN SETTING THE GAS FLOW RATE ON THE
CONTROL VALVE, SO LONG AS THE FLOW
INDICATION BALL IS RAISED OFF THE BOTTOM OF
THE GAS FLOW INDICATOR THIS IS SUFFICIENT
FLOW TO CALIBRATE THE INSTRUMENT ACCURATELY.
Fit the control valve to the zero gas.
Push the calibration valve pipe fully into the push-fit connector of the
sensor housing of the unit.
Fully open the control valve by turning the control knob anti-clockwise.
Allow the gas to flow for 2 minutes.
Enter Technician Mode by pressing the mode switch 3 times. If entered
successfully the green LED will flash off for 1.5 seconds and on for 0.5 of a
second.
Select Zero Calibration by pressing the mode switch 5 times. The Red
Alarm 1 LED will light up to show you are now in this mode.
Press the mode switch 2 times to start the Zero Calibration, the Red Alarm
1 LED will turn off and the Green LED will continue to flash.
Wait one minute for the instrument to adjust. When the instrument has a
new calibration value, the buzzer will sound one bleep and all the LED’s
will be off.
Accept this new calibration value by pressing the mode switch 2 times.
The green LED will flash to show the instrument has accepted the new
Carbon Monoxide value.
To return to normal operation, press the mode switch once. The LED’s and
buzzer will illuminate / sound 4 times before returning to normal
operation.
Fully close the control valve by turning the control knob clockwise.
Remove the calibration valve pipe from the elbow push-fit connector of
the sensor housing of the unit.
NOTE:
IF AT ANY TIME YOU WOULD LIKE TO ABORT ZERO
CALIBRATION, PRESS THE MODE SWITCH ONCE AFTER
STEP 9), THIS WILL BRING YOU BACK TO TECHNICIAN
MODE WITHOUT ACCEPTING THE NEW CARBON
MONOXIDE VALUE. PRESS THE MODE SWITCH ONCE
AGAIN, THIS WILL BRING YOU BACK TO NORMAL
OPERATION, THE LED’S AND BUZZER WILL
ILLUMINATE / SOUND 4 TIMES. ALTERNATIVELY,
DISCONNECT THE POWER SUPPLY TO THE
ANALOX
CO
CLEAR
, WAIT A MOMENT AND RE-CONNECT POWER.
Summary of Contents for CO Clear
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