FAQ

They can be set to take readings from anywhere between one to 255 minutes. Over 2000 readings can be stored continuously, meaning that a 5-minute measurement interval will store a total of 7 days of readings, and a 20-minute interval will store 28 days of readings. The data from the sensors can be downloaded multiple times to achieve virtually any measurement frequency and monitoring period.

Do the sensors have to be initialized during construction?
No. The COMMAND Center was designed to minimize interruption with construction activities. Therefore, the sensors are already fully functional when they arrive. You only need to record the time when concrete covers the sensor, although it is possible to extract this time from the temperature record.

The sensors communicate through the serial or USB port of a laptop (using COMMAND Center Software) or a handheld Pocket PC (note that the Pocket COMMAND Center includes a Pocket PC).

 

 

What is the accuracy of the sensors?
The COMMAND Center uses iButtons®, which have an accuracy of ±1 °C (1.8 °F), which meets the criteria of ASTM C 1074.

Do the sensors have to be connected to anything?
No, the sensors are self-powered and self-contained. The only connection needed is for downloading the data.

Do I need a separate system to track temperatures?
No, the COMMAND Center records both temperature and maturity data. No other sensors are needed.

Which graphical method does COMMAND Center use for making maturity curves?
The COMMAND Center allows the user to choose between a semi-log fit specified by the Iowa and Texas DOT's or a sigmoidal relationship used by the FHWA HIPERPAV program. ASTM C 1074 does not specify a particular curve-fitting technique for maturity curves.

Which maturity method is used by the COMMAND Center?
The COMMAND Center uses the Nurse-Saul method to calculate maturity. It is the most common method used in the US today. It is approved by ASTM C 1074 and doesn't require the extensive laboratory testing as the Arrhenius method does.

How can I get more information?
Contact us!