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USB TREND LOG
The Trend Log is updated onto the USB memory stick every minute to enable to data to be
downloaded and analysed as required. Note that the USB memory stick must have a FAT32
format to store the data and that the memory stick should be directly connected to the
port without the use of USB extension leads.
The Trend log stores the following information:
Default
Header
Channel Data Heading Data Description
TIME
Time
Time of recording in hh:mm:ss format
CH0
O2 Actual
Measured Oxygen Concentration
CH1
O2 Set-Point
Oxygen Concentration Set-point
CH2
CO2 Actual
Measured Carbon Dioxide Concentration
CH3
CO2 Set-Point
Carbon Dioxide Concentration Set-point
CH4
O2 Deadband
Oxygen Deadband
CH5
CO2 Deadband
Carbon Dioxide Deadband
CH6
O2 DB Count
Oxygen Deadband Counter (Time in Deadband in
minutes)
CH7
CO2 DB Count
Carbon Dioxide Deadband Counter (Time in
Deadband in minutes)
CH8
Temp Set-Point
Temperature Set-point
CH9
Chamber Temp Actual
Chamber Temperature Measurement in °C
CH10
Water Tank Level
For workstations with Ultrasonic Humidity this is
the water level remaining in the Water Tank
CH11
Interlock Temp Actual
Interlock Tray Temperature Measurement
CH12
Humidity Actual
Relative Humidity Measurement
CH13
Humidity Set-Point
Relative Humidity Set-point
CH14
Pressure Switch Count Time in minutes since the workstation pressured
dropped below 0.05kPa
CH15
Pressure Switch Actual Pressure Switch Measurement in kPa
Table 8: Trend Log Data Fields
Deadband is the control limit for the gas concentrations. The default value for these is
0.2%, meaning that if the set-point was 5% the workstation would control the gas
concentration to a value between 4.8% and 5.2%. If the measured gas concentration is
outside of these limits then it will start to inject gas to meet the set-point.
If the USB memory stick is removed from the workstation then the measurements for the
removed period of time will not be taken. Therefore, it is advised that when downloading
the measurement data it is completed quickly to reduce the number of missed
measurements.
