Description
The USDA is seeking a Water Activity Meter (Brand Name Aqualab or Equal) for the Eastern Regional Research Center in Wyndmoor, PA. The meter will be used to measure water activity in low-moisture foods. The specifications for the meter include:
• Reading aw from 0.030 to 1.000 with a resolution of 0.0001
• Containing a chilled-mirror dew point sensor and thermoelectric components
• Having a footprint to fit the lab space (max dimensions 11 in x 8 in by 6 in)
• Providing readings of aw, temperature, and moisture content on the screen
• Having an accuracy of aw = ±0.003 units and repeatability of 0.001
• Being lab equipment rather than a portable device
• Having disposable cups with lids to equilibrate samples
• Providing readings for each sample in about 5 minutes
• Having a sample cup capacity of about 14 ml (0.47 fl oz)
• Having an alarm beep after each sample is finished