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General| Brand | Decagon Devices |
|---|---|
| Model | Pawkit |
| Category | Measuring Instruments |
| Language | English |
This manual includes instructions on the operation, calibration, and maintenance of your Pawkit water activity system.
Provides contact methods for assistance and questions regarding the Pawkit instrument.
Details the Pawkit's 30-day satisfaction guarantee and one-year warranty on parts and labor.
Manual is written to aid end users in understanding basic concepts of water activity.
Explains the use of a dielectric humidity sensor to measure water activity based on relative humidity.
States the Pawkit's accuracy is ±0.02 aw and mentions a higher-accuracy alternative.
Lists items included in the Pawkit system package: main unit, case, cups, filters, cleaning kit, and calibration solutions.
Identifies key components of the Pawkit instrument including LCD, buttons, sensor, and sample chamber.
Details how to prepare samples and insert them into the instrument.
Guidelines for creating homogeneous samples and proper cup filling for accurate water activity readings.
Tips on cleaning cup rims, sealing samples for later measurement, and avoiding sensor contamination.
Step-by-step instructions for opening the chamber and inserting the sample cup correctly.
Instructions for ensuring the cup is seated and securing the chamber before taking readings.
How to open the chamber to remove the sample cup after measurement.
Correct procedure for closing the instrument by pressing specific points.
Explains the automatic shutoff feature and how to wake the instrument.
Details the 6.0 molal NaCl (0.760 aw) and 13.41 molal LiCl (0.250 aw) calibration standards.
Procedure for verifying calibration using the NaCl standard and noting readings for accuracy.
Navigating calibration mode screens (u76, d76, u25, d25, Sto) to adjust values.
Adjusting calibration values using buttons I and II, and saving settings with 'Sto'.
Repeating calibration for the 0.25 standard and how to exit calibration mode.
How alcohol exposure can affect sensor calibration and mitigation steps like airing the chamber.
Handling samples that are too warm or too cold to ensure accurate readings and avoid condensation.
Tips for cleaning the LCD, outer case, and internal components like the sensor screen with appropriate materials.
General overview of maintenance procedures.
Instructions for taking apart the Pawkit for cleaning or part replacement, starting with the foot plate.
Caution about not kinking the cup temperature sensor during disassembly.
Steps for re-assembling the Pawkit, aligning tabs and engaging springs correctly.
Final steps for re-attaching the foot plate after disassembly.
How to clean or replace the porous sensor filter using distilled water or isopropyl alcohol.
How to clean the chamber area using a moist cloth or Kimwipe, and re-assemble the instrument.
Warning that the sensor is extremely fragile and should not be touched directly.
How to identify a low battery and detailed instructions for replacing the Lithium-ion cells.
Detailed steps for disassembling the Pawkit to access the batteries, separating internal components.
Replacing batteries, orienting them correctly, and re-assembling circuit board and retainer.
Final steps for re-assembling the elastomer assembly into the case top and securing it.
Contact information for service and repair, and required details for inquiries and payment.
How to package and prepare the instrument for shipment for repair, including packing material recommendations.
Address for shipping the Pawkit for repair, and information on repair costs and warranty.
Information on warranty repairs, non-warranty costs, minimum charges, and rush work fees.
Defines water content, its measurement methods, and limitations compared to water activity.
Defines water activity as energy status of water and its importance for product quality, safety, and stability.
Explains how water activity is measured using relative humidity and dielectric sensors in equilibrium.
Discusses temperature's critical role in accuracy and how the thermometer icon indicates potential issues.
Relates water activity to water potential and Gibbs free energy, explaining moisture movement principles.
Lists factors influencing water potential, including osmotic, matric, and pressure effects.
Explains osmotic effects and how solute addition lowers water activity and affects microbial cells.
Describes how sample matrix binding affects water activity through physical forces like adhesion.
Explains the relationship between water activity and water content via sorption isotherms, unique to each product.
Discusses using water activity to infer water content and the importance of isotherms for product analysis.
Emphasizes the importance of water activity for predicting stability and reactivity over water content.
Lists publications related to water activity theory and its measurement techniques.
Lists references on food quality and safety aspects related to water activity.
Lists references on the relationship between water activity and microbial growth and stability.
Lists references related to water activity in meat and seafood products.
Lists references related to water activity in dairy products and fruits/vegetables.
Lists references related to water activity in vegetables and baked goods/cereals.
Lists references on water activity in beverages, soups, sauces, and preserves.
Lists references on water activity in pharmaceuticals and cosmetics.
More references on moisture effects on drug stability and cosmetics.
Lists references on general topics related to water activity in various applications.
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