Test
Rotronic
HygroPalm
AW1

 
   

EminTech 

 
Plus
+ good design
+ reliable results
+ flexible
 
   
Navigation: Water activity
  What is water activity
  Test Introduction
Test details
  Salt solutions used
  Calibration samples used
  Desktop instruments
  Portable instruments
Results
  Desktop instruments
  Decagon AquaLab 3TE
  Novasina LabMASTER-aw
  Rotronic HygroLab 2
  Portable instruments
  Decagon PawKit
    Rotronic HygroPalm
  Testo 650
Summary
  Desktop instruments
  Portable instruments
 
Minus
- inadequate low battery
  voltage warning
- bad manual routines
 
   
Links Rotronic
HygroPalm AW1
Swe.agent SWEMA
Price € ~ 1 500
Sensor AwVC-DIO
   
      Specification
Accuracy 0.005 aw
+1.5% of read
Range 0 - 1.000 aw
   
     Calibration
Instructions No
Samples ~ € 40 / 5
Own media Yes
   
     Other
Manual

Not from agent

in Swedish No
Computer
interface
No
 
Design
The design was very good rea-
lized. Both visual appearance
and technical function were
impressing. Both the sample
cell and the instrument suited
their purposes well. One examp-
le of good design was a small
fan that increased convection
in the measurement cell.

The software of the device was
quite satisfying. It was possible
to choose different measure-
ment modes, either continuous
or terminated when adjustable
criteria (change in aw per minute)
was reached. An extrapolating
result calculation that worked
better than expected was also
included.
 
   
Manual
No manual was submitted by the Swedish agent. After request, however, a dense information
sheet in English was submitted.

Calibration
Calibration was easily performed by pushing buttons according to description in the manual.

Measurement results
The measurements were easily accomplished and gave stable results as seen in the diagram, below.

Other
The main disadvantage with this instrument was caused by decreasing battery voltage. When
battery voltage fell, the measurement results decreased at least 0.01 aw. A warning of low voltage
appeared at the instrument display significantly later after a decrease in aw was noted.
   
       
      Deviation versus aw for HygroPalm AW with measurement cell
AwVC-DIO in four measurement series.
   
               
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