The HP22 is a versatile hand-held indicator that displays relative humidity, temperature and a calculated parameter such as the dew or frost point. The key features of the HP22 will meet user requirements ranging from the most simple to demanding. Selecting the appropriate probe model from the HP22 probe options is done based on the application. Depending on the probe model, the measuring range is within 0 to 100 %RH and -100 to 200°C (-148 to 392°F). The HygroClip 2 probes feature durable sensors and consistent performance. All HygroClip 2 probes can be hot-swapped to facilitate routine calibrations.



The HP22 indicator has 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 sophistication, the HP22 can still be used just as a simple humidity and temperature indicator. Whether you decide or not to take advantage of its full potential, the HP22 will let you have it your way.

Key Features

► Measures relative humidity and temperature

► Calculates dew point, frost point, wet-bulb temperature, mixing ratio, etc.

► Interchangeable probe - can be separated from the HP22 by up to 5 m / 16.4 ft.

► Operating limits at probe 0 to 100 %RH and -100 to 200 °C (-148 to 392 °F) - depending on probe model

► Accuracy at 23 °C: ± 0.8 %RH and 0.1 °C

► Temperature unit (°C or °F) selectable from the keypad

► Uses a regular 9V alkaline battery

► LC display with backlight - shows %RH and temperature or %RH, temperature and calculated parameter (keypad    selection)

► Data recording (%RH and temperature) - up to 2000 value pairs

► Automatic RH sensor drift test with optional correction

► 1-point or multi-point humidity adjustment of the probe directly from the keypad

► 1-point temperature adjustment of the probe directly from the keypad

► External service connector for full access to the settings and functions of both the HP22 and probe

HC2-S: measurement in ambient air
	Humidity measuring range: 0…100 %RH Temperature limits -40…100 °C (-40…212 °F) Diameter: 15mm (0.6”), length: 85 mm (3.3”) Housing and filter cap: polycarbonate, black Standard dust filter: NSP-PCB-PE (Polyethylene) Weight: approx. 10 g (0.35 oz)
HC2-P05: measurement in air ducts
	Humidity measuring range: 0…100 %RH Temperature limits -40…85 °C (-40…185 °F) Barrel: diameter: 5 mm (0.2”), length: 200 mm (7.9”) Probe cable length: 2 m (6.5 ft) Handgrip: POM, black  -  barrel: stainless steel Weight: approx. 160 g (5.6 oz)
HC2-C04: measurement in tight spaces
	Humidity measuring range: 0…100 %RH Temperature limits -40…100 °C (-40…212 °F) Diameter: 4 mm (0.16”), cable length (electronics – probe tip: about 2 m (6.5 ft) Probe body: polycarbonate, black Weight: approx. 150 g (5.3 oz)
HC2-C05: measurement in tight spaces
	Same as HC2-C05 but with 5 mm diameter (0.2”) Can be equipped with Teflon dust filter SP-T05 (see Accessories) Weight: approx. 160 g (5.6 oz)
HC2-HK25 / HC2-HK40: air probe for measurement at temperature extremes
	Humidity measuring range: 0…100 %RH Temperature limits at sensor: HK25: -100…150 °C (-148…302 °F) HK40: -100…200 °C (-148…392 °F) Barrel: HK25: diameter: 15 mm (0.6”), length: 250 mm (9.8”) HK40: diameter: 15 mm (0.6”), length: 400 mm (15.7”) Probe cable length: 2 m (6.5 ft) Handgrip: POM, black -, barrel: PPS, black Filter base (NSP-ME) with wire mesh filter cartridge (SP-M15) Weight: HK25: approx. 210 g (7.4 oz) HK40: approx. 240 g (8.5 oz)
HC2-HP28 / HC2-HP50: measurement of materials in bulk
	Humidity measuring range: 0…100 %RH Temperature limits at sensor -40…85 °C (-40…185 °F) Barrel: HP28: diameter: 10 mm (0.4”), length: 280 mm (11.0”) HP50: diameter: 10 mm (0.4”), length: 500 mm (19.7”) Probe cable length: 2 m (6.5 ft) Handgrip: POM, black  -  barrel: stainless steel Filter base (NSP-ME) and sintered steel filter cartridge (SP-S15) Weight: HP28: approx. 200 g (7.1 oz) HP50: approx. 250 g (8.8 oz)
HC2-HS28 / HC2-HS42: measurement of paper stacks and rolls
	Humidity measuring range: 0…100 %RH Temperature limits at sensor -40…85 °C (-40…185 °F) Blade HS28: thickness: 4 mm (0.16”), width: 22 mm (0.87”), length: 280 mm (11.0”) HS42: thickness: 4 mm (0.16”), width: 22 mm (0.87”), length: 420 mm (16.5”) Probe cable length: 2 m (6.5 ft) Handgrip: POM, black  -  blade: aluminum Weight HS28:: approx. 240 g (8.5 oz) HS42:  approx. 300 g (10.6 oz)