Interpreting Data - 3M 740 Serie Instrucciones De Uso

Interpreting Data

The data log records are stored in a comma-separated-values format that is easily imported into spreadsheet programs. The filename format is based on the year, month,
day and time that the session started in the format: yyyy.mm.dd_hh.mm.ss. It is recommended that you save these files in a folder named after the serial number of the
instrument being downloaded, simplifying file retrieval. Each file has a "header" (Table ) consisting of between 9 and 1 rows of information including the serial number,
session start date and time, user ID, data log interval, sensor information on alarm levels, last sensor test date and test gas levels.
70 Series
SN:0000000
Software version V1.05
Started:dd/mm/yy 16.5.9
User ID:15
Data-log interval: 60 seconds
Status Low
Alarm
OX O 19.5
EX O
HS O
Table  – Typical Data Log Header
Below this header are the readings for each interval that the instrument has recorded data. There are columns for time, gas readings, calculated STEL and TWA levels for
CO and HS, sensor status, unit status, battery status and record type. The sensor status, unit status, battery status and record type use codes detailed in table 5.
Sensor status codes found O – sensor is OK
in sensor status event and I – inactive
datalog header B – bad
D – sensor test due
E – error in sensor test data
F – full test required
Sensor status codes found in L – sensor is in low alarm (only for oxygen sensor)
an alarm record H – sensor is in high alarm
Q – alarm was silenced
Battery status L – low battery warning
D – low battery alarm
Record type M – data record (every 1 minute)
C – sensor test record
5 – alarm record (5 second data logging)
L – datalog download event
S – sensor status event
B – battery event record
Unit Status For L – datalog download event
N Transmit new data
A Transmit all data
T Transmit text data format
B Transmit binary data format
Beginning of an operation
O Successful operation
C Cancelled operation
F Failed operation
W
S
Z
T
Table 5 – Data Log Codes
High TWA STEL
Alarm Alarm Alarm

10
10 10 15
For C – sensor test record
Beginning of an operation
Successful operation
Cancelled operation
Failed operation
Waiting for gas
Span sensor
Zero sensor
Test sensor
Last Sensor Test
Date (dd/mm/yy)
06/1/0
06/1/0
06/1/0
16
Sensor Test
Gas
10 % LEL Methane
10 ppm