HygroPalm - HP22-A - versatile handheld indicator

The HP22 is a versatile hand-held indicator that displays relative humidity, temperature and a variety of calculated parameters such as dew or frost point based on the measurements of a HygroClip2 plug-in probe.

Probe selection is based on the application. Depending on the HygroClip2 probe model, the measuring range is within 0 to 100 %RH and -100 to 200°C (-148 to 392°F). The HygroClip2 probes feature durable sensors and consistent performance. All HygroClip2 probes can be hot-swapped to facilitate routine calibrations.

The HP22 indicator offers extensive settings and functions that can be enabled and configured by the user either directly from the keypad or with the ROTRONIC HW4 software.

Mobile inspection and random tests in HVAC, the pharmaceutical industry and building management systems

• Combinable with all ROTRONIC HC2 probes
• Range of application: -10…60 °C / 0…100 %rh
• All psychrometric calculations
• Adjusted at 23 °C and 10, 35, 80 %rh
• Service interface (UART)


  • Food
  • HVAC
  • Meteorological
  • Paper
  • Pharmaceutical
Probe type Standard probe
Dimensions 268 x 72 x 30 mm
Operating range -10…60 °C / 0…100 %rh
Accuracy at 23 ±5 °C Probe dependent
Measuring range with interchangeable probe 0…100 %rh and -50…200 °C
Power supply / Power consumption 9 V battery, power supply 4 mA consumption without back light
Long-term stability <1 %rh / year
Humidity sensor Probe dependent
Temperature sensor Probe dependent
Response time t 63 Probe dependent
Allowed wind speed 20 m/s, with filter
Psychrometric calculations All psychrometric values
Number of probe inputs 1
Calibration / adjustment multipoint adjustment via keypad
Initialisation time Typically <2 sec.
Measurement interval typically 1 second (without calculations)
Display type Graphic display. Display freely configurable.
Backlight with Backlight
Battery indicator Low Batt. Display
Exploitation software ROTRONIC HW4
Menu guidance Yes
Trend indicator Yes, for models with display
Statistical functions Min / Max, Average
Probe adjustment by software Yes, with service cable
Probe adjustment by keypad 1 point or multi-point temperature and humidity adjustment
Event logging System related events (FDA, GAMP)
Firmware update With internet and HW4 software
User information from Software HW4 (devicemanager)
Data processing via HW4 Yes
Device Protection by password Yes
Sensor diagnostics (drift, state) Programmable; factory default - Off
Audit Trail/ electronic records FDA 21 CFR Part 11 and GAMP compatible
Choice of Battery / rechargeable battery Yes
Service Interface Mini USB (UART)
Service Information Calibration interval
Reverse voltage protection Mechanically in the connector
Max. cable length Up to 5 m with passive cable. Up to 100 m with active cable.
Max. probe cable length 10 m
Enclosure material ABS
IP protection rating IP40
Fire protection class Complies UL94-HB
FDA/GAMP compatibility FDA 21 CFR Part 11 and GAMP compatible
Weight 210.0000

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