Instruction Manual
Model MicroCEM
The MicroCEM maintains a minimum of 3 months of history in three types of data log files. The first type of log file is the measurement log, which contains emission measurements (at 1 minute intervals), alarm indications and maintenance mode indications. The second type of log file is the calibration log file, which contains information on each auto calibration done. The third is the alarm log file, which records any improperly functioning hardware. The data will be stored in flat, ASCII, CSV
a.Maximum Log File Size
This is how large a log file can get (in bytes) before it is closed and a new log file is opened.
b.Maximum Number of Log Files
This is how many log files can be cre- ated. When the maximum number of log files is reached, the oldest file is overwritten when new ones are cre- ated.
Emissions Log: | 6 |
Calib Log: | 6 |
Alarm Log: | 6 |
c.Log File Name Format
The log file name uses the date that the file was created. It is of the format TYYYYMMDD.CSV where T is the log file type (E=Emissions, C=Calibration and A=Alarm), YYYY is the Year, MM is the month, and DD is the day of the month. For example, the file name E20010329.csv contains emissions data and was created on March 29, 2001.
d.Measurement Log File Format
Emissions Log: | 1 MB |
Calib Log: | 4000 bytes |
Alarm Log: | 4000 bytes |
The log file contains data in a flat, AS- CII, CSV file. The following are the fields of the file, in order of occurrence. The log file size will be about 42 bytes per entry. 3 months of data logs will require about 5,443,200 bytes
Name | Description | Example |
Date/Time | ||
O2 | Percent O2 (percent) | 10.5 |
|
|
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CO | CO parts per million | 12 |
NOx | NOx parts per million | 15 |
CO Limit | CO Limit exceeded alarm, 0=inactive, 1=active | 0 |
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|
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NOx Limit | NOx Limit exceeded alarm, 0=inactive, 1=active | 0 |
O2 Status | V=Valid, M=Maintenance Mode, C=Calibration in process, | V |
| I=Invalid (calibration failed or sensor in failed state) |
|
CO Status | V=Valid, M=Maintenance Mode, C=Calibration in process, | V |
| I=Invalid (calibration failed or sensor in failed state) |
|
NOx Status | V=Valid, M=Maintenance Mode, C=Calibration in process, | V |
| I=Invalid (calibration failed or sensor in failed state) |
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| Table |
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Operation | Rosemount Analytical Inc. A Division of Emerson Process Management |