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Technical Bulletin
Bulletin# SGSQ42012-2
The purpose of this procedure is to provide instrument users an easy to use procedure
to check for solenoid leaks in the Model 49i Ozone Analyzer or 49i-PS Primary Standard
Calibrator.
Leaks in the solenoids can cause an imbalance in concentration readings between cells.
When an imbalance is noticed this test should be performed to help determine the cause
of the imbalance.
This procedure assumes some user familiarity with the instrument menu structure.
If difficulty is encountered navigating the menu, please consult the instrument instruction
manual where a menu structure breakdown is located. It is entitled Flowchart of Menu-
Driven Software and is typically located in the beginning of Chapter 3 – Operation.
1.
Using an external source of ozone generate approximately 0.5 ppm (500
ppb) and introduce to the analyzer or calibrator.
2.
Press the menu button to enter the main menu.
3.
Using the down arrow button, scroll down to the diagnostics menu selection
and press the enter button to display the diagnostics menu selections.
4.
Again using the down arrow button scroll down to Cell A/B O3 and press
enter. The unit will now display the concentration as determined in each cell
individually.
5.
Once the unit has stabilized on the external ozone gas sample, using a
separate piece of paper, manually take 10 successive simultaneous update
readings from Cell A and Cell B. Readings update every 10 seconds. Find the
average of the Cell A readings and the average of the Cell B Readings. The
average readings of Cell A and Cell B should agree within +/- 3% of each other.
Air Quality Instruments
49i Series Cell A/B Test
Models 49i / 49i-PS
27 Forge Parkway
Franklin, MA
02038
508-520-0430 ph
www.thermofisher.com
508-520-1640 fax
Rev 00/2012
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Summary of Contents for ThermoFisher Scientific 49i Series
- Page 1 Technical Bulletin 49i Series Cell A/B Test Models 49i / 49i-PS Bulletin# SGSQ42012-2 Rev 00/2012 The purpose of this procedure is to provide instrument users an easy to use procedure to check for solenoid leaks in the Model 49i Ozone Analyzer or 49i-PS Primary Standard Calibrator.
- Page 2 A balance reading of betters than 3% indicates there is no leak across the solenoids. A constant low reading on one cell indicates an imbalance. The imbalance can be caused by a dirty cell, dirty lines to the cell or a leaking solenoid. To check for dirty cell, remove and swap the cells i.e.
- Page 3 Tab down to pressure check and press enter. In this menu go to sample pressure and again press enter. This will change the state of the solenoid and will also lock the solenoid in that position so that it will not repeatedly change states. 10.
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