HP23-AW-A Handheld Water Activity Kit

The HygroPalm HP23-AW-A offers the perfect solution for on-site water activity measurements to confirm product stability and indicate shelf life. The HP23-AW-A is suitable as a mobile laboratory unit. The HP23-AW-A is perfect as a portable analyzer with two sensor station inputs.
It includes many of the advanced features of the HygroLab C1, but in a convenient portable configuration.

• 2 input channels for HC2 sensor heads or HP2 insertion probes.
Measurement of water activity, relative humidity and temperature
• Aw Quick function for fast measurement results (typically 4-5 minutes)
• Audible alarm to indicate completed measurement
• Saves up to 10,000 data records with %RH, °C/°F, date and time
• Battery charging function

Probe connections 2 HygroClip2 or analog input 0…3.2 VDC (power supply for analog probe: 5 VDC)
Parameters shown Aw, % RH, °C, °F
Aw Quick function Integrated or via optional HW4 software HW4-P-QUICK-Vx
Calculations All psychrometric calculations available
Probe adjustment Single or multiple point for relative humidity & temperature one or two point temperature
Memory Capture mode: 8 x 250 values
Logging mode: 10,000 values
Measurement interval 1 s, 10 s, 1 min, 10 min
Start-up time 3s
Power supply 9 V battery or USB/ mains adapter via mini USB
Interfaces Mini USB
HW4 compatible Yes, for all HW4 versions
Range of application -10…60 °C (14…140 °F) / 0…1 Aw / 0…100 %RH
LCD 3-line alphanumeric with trend indicators
Clock Real time clock provides a time stamp for every measurement
Current consumption Max. 20 mA (backlight ON)
IP protection class IP30
CE / EMC conform EMC 2008/108/EG
FDA / GAMP FDA 21 CFR part 11 / GAMP5
Dimensions /Weight 188 x 72 x 30mm / 200 g
Material ABS
Compatible products: Water activity probe: HC2-AW
Insertion probe: HC2-P05, HC2-HP28, HC2-HP50
Incudes: 9 VDC AC Adapter, instruction manual, HW4-P-Quick-V3 Software


There are two types of sensors that can be used. Sensor heads (model HC2AW) comprise a puck shaped head which contains the electronics and ERH sensor (Equilibrium Relative Humidity). The sensor station is placed over a sample cup holder so as to form a sealed environment around the sample. The ensuing relative humidity in this sealed environment is the basis of water activity measurement. The sample is typically placed in a disposable sample cup which sits inside the sample cup holder.

The HP23 can also monitor the output from insertion probes. Insertion probes work in certain kinds of bulk products such as grain. When the probe tip is buried in the bulk material the local environment in the region of the tip is effectively isolated from the atmosphere and a local ERH can be obtained as if it were in a sealed chamber.


Model Description Price  
HP23-AW-A Set-14 HP23 kit with 14mm sample holder & cups, HC2 sensor head, 25 disposable sample cups and carry case. $2950.00
HP23-AW-A Set-40 HP23 kit with 40mm sample holder & cups, HC2 sensor head, 25 disposable sample cups and carry case. $2950.00
HC2-AW Sensor heads for the HP23-AW-A (also compatible with Hygrolab C1 bench-top indicator) $1495.00  


Topac Inc 231 CJC Highway, Cohasset MA 02025 USA
Tel: 781 740 8778 Fax: 781 740 8779 e-mail: sales@topac.com

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