Portable humidity and temperature measurement


portable spot checks
compatible with all HC2 probes
all psychrometric calculations

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Portable humidity and temperature measurement.

This handheld device can be used in combination with any of the HygroClip HC2 probes, using AirChip technology to offer outstanding accuracy and repeatability performance.  The range of HC2 probes, and the ability to calculate humidity in a variety of different scales (see below), allows the HygroPalm22-A (HP22-A) to be extremely versatile.

Quick spot checks of processes or controlled areas can be made to ensure humidity and temperature requirements are within acceptable limits.

This portable unit can be used to decrease measurement costs by using a single instrument to monitor several locations, when permanent monitoring is either not required or cannot be justified.

The HP22-A can also be used to cross-check permanently installed systems.

For an option with an internal data logger or two probes connected simultaneously see the HygroPalm23-A

The HP22-A calculates humidity in a choice of humidity scales:

  • Relative humidity in %
  • Temperature in °C or °F
  • Absolute humidity in Kg/m3
  • Dew point/frost point in °C or °F
  • Wet-bulb temperature in °C
  • Enthalpy in KJ/Kg
  • Specific humidity in g/Kg
  • Vapour concentration in g/m3
  • Mixing ratio in g/Kg
  • Saturation vapour pressure in hPa
  • Partial water vapour pressure in hPa
  • Water vapour saturation pressure in hPa
  • Water vapour partial pressure

Sensor Technology

Advanced sensor diagnostics can be enabled using the AirChip3000 technology enbedded in the HygroClip2 (HC2) probe. Up to 2,000 measured values can be stored in the probe with the ability to set alarm limits, configure measuremnent intervals and download the data to HW4 software.

For further information about humidity measurement and hygrometry issues, please visit our Masterclass section.



Relative humidity and temperature

Measurement principle

Rotronics rh probe and Pt100

Measuring range with interchangeable probe

0 to 100 %rh and -50 to 200 °C

Number of probe inputs


Probe type

All ROTRONIC HC2 probes

Max. probe cable length

Passive: 5 m

Active: 100m

Probe Initialisation time

Typically <2 sec


Airchip 3000 <0.02%rh and 0.01K

Response time t 63

Probe dependent

Accuracy at 23 ±5 °C

Probe dependent

Operational temp. and humidity range (instrument)

 0 to 100 % rh and -10 to 60 °C

Long term stability

<1 %rh / year

Allowed flow rate

Probe dependent

Probe diagnostics (drift,state)

Programmable, default:off

Display and Communications

Display type

Backlit graphical LCD (configurable)

Psychrometric calculations

All psychrometric values

Battery indicator

Low battery display

Trend indicator


Statistical functions

Min / max, average

Measurement interval

Typically 1 sec without calculations

Start-up time

Typically 3 Seconds

Data logging

2000 data point memory in probe 

PC interface

Via interface cable and HW4 software

Calibration Adjustment

Probe adjustment by keypad


Probe adjustment by software

Via HW4 software and service cable. rh: multipoint, temperature 2 point

Event logging

System related events (FDA, GAMP)

Firmware update

With internet or HW4 software

User information

from Software HW4 (device manager)

Data processing via HW4


Device protection via password


Sensor diagnostics (drift, state)

Programmable; factory default - Off

Max. cable length service cable

5 m

Firmware update

Via HW4 software and service cable



Compliant, 2007/108/EG

IP protection rating


Fire protection class

Complies UL94-HB

Audit trail and electronic records

 FDA 21 CFR Part 11 & GAMP compliant


Shipping weight

210 g



196H (without probe) 268H (with stanard probe)x 72W x 35D mm


Housing: ABS



9 V battery or power supply

Power consumption

4 mA consumption with back light off


Service interface


All specifications subject to change



 Handheld humidity and temperature instrument HP22-A set

Handheld Instrument Set



 Service cable AC3006

Service Cables

AC3006 (requires external power supply)



Extension Cable


black, 2 m

Polyethylene filter nsp-pcb-pe40 

Filtercarrier & filter for standard probe HC2-S



Calibration device for HC2-S probes 

Push-on calibration device


Ø14…15 mm; gasket with O-ring and thumb screw; for 1 probe; brass, nickel-plated

Desk top stand for HygroPalm22 DESK-HP 

Desktop stand for handheld instruments


Humidity standard for calibration   

Humidity standards

for 10 %rh, 80 %rh, 35 %rh