HygroPalm - HP21 - Handheld

The HP21 is a highly accurate handheld indicator that displays relative humidity, temperature and dew or frost point temperature. The HP21 is perfect for spot checking HVAC installations, manufacturing or storage areas and any ambient air measurement within the temperature range of -10 to 60°C (14 to 140 °F). The HP21 is designed to meet a wide range of user requirements from the most basic applications to the most demanding applications.

The HP21 indicator offers an extensive set of settings and functions that can be configured and enabled by the user with the ROTRONIC HW4 software. In spite of its high end design, the HP21 is ideal even as a simple humidity and temperature indicator.

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

• Range of application -10…60 °C / 0…100 %rh
• Accuracy at 23°C ±5 K: 1 %rh, 0.2 K
• Adjusted at 23 °C and 10, 35, 80 %rh
• Service interface (UART)
• Calculation of dew and frost point


  • Food
  • Meteorological
  • Paper
  • Pharmaceutical
Accuracy at 23 ±5 °C ±1.0 %rh / ±0.2 K
Accuracy w. adjustment profile "standard" at 23 °C / 10, 35, 80 %rh ± 1.0 %rh / ± 0.2 K
Operating range -10…60 °C / 0…100 %rh
Measuring range with integrated probe -10…60 °C / 0…100 %rh
Power consumption 9 V battery / ~5 mA (without lighting)
Long-term stability <1 %rh / year
Humidity sensor Hygromer IN-1
Temperature sensor PT100 1/3 DIN Class B
Probe protection Polycarbonate plastic cage, black
Response time t 63 <3 sec.
Allowed wind speed 40 m/s, with filter
Psychrometric calculations Dew or frost point
Backlight with Backlight
Calibration / adjustment with keypad
Display type Graphic display. Display freely configurable.
Initialisation time Typically <3 sec.
Measurement interval 2 seconds
Reproducibility Airchip <0.02 %rh / 0.01 K
Alarm indicators Yes
Battery indicator Low Batt. Display
Exploitation software ROTRONIC HW4
Menu guidance Yes
Trend indicator Yes
Probe adjustment by software Yes, with service cable
Software Update With internet and HW4 software
User information from Software HW4 (devicemanager)
Data processing via HW4 Graphics, statistics, analysis, qualification, etc.
Device Protection by password Yes
Enclosure material ABS
Fire protection class Complies UL94-HB
IP protection rating IP40
Service Interface Mini USB (UART)
FDA/GAMP compatibility FDA 21 CFR Part 11 and GAMP compatible
Dimensions 268 x 72 x 30 mm

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