Specifications

CO2 Analyzers 3100 & 3150

Instruction 19-9339 30

6.0 Taking Readings

6.1 Preliminary Checks - Best Practice

Prior to use, it is good practice to ensure that:

Step 1 The instrument has the correct time and date set.

Step 2 The sample ﬁ lter is ﬁ tted and that it is clean and dry.

Step 3 The battery has a good charge (minimum 25% charge, even if only a few

readings are required).

Step 4 The memory has sufﬁ cient space available.

Step 5 The main gases have been auto-zeroed, without gas concentration present.

Step 6 If necessary, check the span calibration with a known concentration calibra-

tion-check gas.

Step 7 Take readings.

• DO protect the instrument from strong direct sunlight which could

raise the temperature of the instrument beyond its operating range.

• DO remember to always use the sample ﬁ lter! If the sample ﬁ lter

becomes ﬂ ooded, change it and ensure all sample tubes are clean

and dry before re-use.

• DO NOT place the instrument against anything hot as this may

cause excessive internal temperatures which can lead to erroneous

readings.

• DO NOT get the instrument wet.

6.2 Gas Measurement Process

Depending on preferences, the exact reading procedure can change.

The following method is considered best practice and when followed

correctly will allow quick and consistent readings to be recorded.

1) When the instrument is ﬁ rst switched on it should be purged with

fresh air and allowed to stabilize for a few minutes.

2) At this point the user must zero the CO

channel. This option is

available via the “CALIBRATION” menu. The instrument is now

ready to take the ﬁ rst reading.