Instruction Manual

748467-A January 2002

Model MicroCEM

3-6 MicroCEM DATA LOGS

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 (comma-delineated) file. This file format can be read directly by MS Excel and imported into many types of software applica- tions. The following parameters is factory set for each of the log file types.

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

Month-day-year Hours:Minutes:Seconds

3-7-2001 10:24:57

O2

Percent O2 (percent)

10.5

 

 

 

CO

CO parts per million

12

NOx

NOx parts per million

15

CO Limit

CO Limit exceeded alarm, 0=inactive, 1=active

0

 

 

 

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)

 

 

Table 3-7. Measurement Log File Format

 

3-18

Operation

Rosemount Analytical Inc. A Division of Emerson Process Management