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Readings.
Readings are time and date-stamped gas concentration measurements (e.g.
%LEL, %GAS, %Oxygen, and ppm CO) recorded by the detector along with identifying
information such as the detector’s serial number, user’s name, the operational mode used to acquire
the readings, and the state of the pump when the readings were taken. When the memory is filled,
the oldest data is automatically overwritten by the new data.
The following gas concentration readings are recorded with a full suite of sensors:
Percent LEL
0 – 100%
Percent O
2
0 – 40% vol.
Percent GAS 0 – 100% vol.
PPM CO
0 – 2000 ppm
PPM GAS (Survey Mode)
PPM CH
4
0 - 40,000 ppm
Note: % LEL readings are only recorded in detector models ending in 201, 301, 321 and 411.
Standard: 100% LEL = 5% GAS; Optional: 100% LEL = 4% GAS.
The data also includes alarm flags set under the following conditions:
Start of any alarm condition
Start of a low/high O
2
alarm
Start of LEL alarm
Start of a high CO alarm
Readings and Alarm Summary.
To save time, a Readings Summary data file can be
downloaded resulting in the display of a Sorted Readings Table, which helps to identify when the
unit was powered on and the operational mode changed. Using the data on alarm flags in the
Readings Summary file, a Sorted Alarm Events table can be displayed to identify the time and date
of alarm events without downloading the entire readings data file.
Calibration Data.
Data from the last 24 calibrations are stored in the gas detector. The
following data are stored for each calibration:
1.
Key data that makes each calibration unique:
Unit Serial Number
Date Calibrated
Hour and Minute Calibrated
Calibration Sequence
2.
Before calibration readings on calibration gas
3.
After calibration readings on calibration gas
4.
Sensor sensitivities
5.
Operational information:
Pump working OK (Y/N)
Days since last calibration
Calibration check OK (Y/N)
Minutes operated since last calibration
Number of times the unit was powered on since last calibration
Methane sensor cleaned during calibration (Y/N)
User Data.
The user data is stored in the detector as a single record and includes:
User Name
Day Limit Between Calibrations
Personal Identification Number (PIN)
PIN entry can be optionally required for calibrating a detector at a docking station. The PIN can
be a number entered on a keypad or an alphanumeric entered on a keyboard.
