Technical Manual CODEL
24
Span NO2 - 600ppb in N2
6.1.4.1. To initiate span check, remove the blank plug from the E-Cell block and connect the span
kit. Connect the pipe to gas bottle. As this step is to initiate a zero cal, connect 100% N2
bottle.
6.1.4.2. Set the flow rate to 1 litre per minute, and wait for around 3 minutes. The level will be
displayed on screen.
6.1.4.3. To initiate the zero cal follow the steps of section 5.3.3. ‘Electrochemical Cell Calibration’.
Once zero cal has been initiated, wait for around 3 minutes for zero cal to complete,
leaving the gas bottle on for around another minute.
6.1.4.4. Once zero cal has been completed, the levels can be checked for the individual gases.
Connect NO, at the same flow rate and follow the steps below to check level readings.
Press , the following screen appears.
Use or to scroll through to E-Cell CH1 and press to select E-
Cell CH1. The Display returns to measurement screen displaying E-Cell
CH1 reading.
6.1.4.5. Repeat these steps for the remaining gases of CO and NO2.
6.1.4.6. If the levels are reading incorrectly, follow the steps below.
It is possible to use different calibration gas levels, as long as they are within the maximum
measurement range of the analyser.
6.1.3. Electrochemical Cell replacement
Every 18 months it is required to replace the electrochemical cell. The replacement cells will be
supplied from CODEL pre-calibrated complete with card.
6.1.3.1. To remove the electrochemical cell, open the TT700 casing and locate the E-Cell.
Select Channel
E-Cell CH1
Select Channel
E-Cell CH1
1. Meas – 09:34:50
CO: 0.1 ppm
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