ROTRONIC HP21 - Manual (Page 12)

E-M-HP21-V1_21
Rotronic AG
Bassersdorf, Switzerland
Document code Unit
HygroPalm HP21 hand-held indicator:
User Guide Instruction Manual
Document Type
Page 12 of 14
Document title
© 2009-2010; Rotronic AG E-M-HP21-V1_21
7 Technical data
7.1 Specifications
General HP21
Device type Humidity-temperature hand-held indicator with integral probe
Battery type 9 V alkaline
Low battery indication Yes
Humidity measurement
HP21
Sensor ROTRONIC Hygromer ® M1-R
Measuring range 0…100 %RH
Measurement accuracy at 23 °C ±1.0 %RH
Repeatability 0.3 %RH
Long term stability < 1 %RH / year
Sensor time constant Typical 10 sec, 63% of a 35 to 80 %RH step change (1m/sec air flow at sensor)
Temperature measurement
HP21
Sensor Pt100 RTD, IEC 751 1/3 class B
Measuring range -10...60°C
Measurement accuracy at 23 °C ±0.2 °C
Repeatability 0.05°C
Long term stability < 0.1°C / year
Sensor time constant Typical 4 sec, 63% of a step change (1m/sec air flow at sensor)
Calculated parameters
HP21
Psychrometric calculations Dew or frost point (user configurable setting)
Start-up time and data refresh rate
HP21
Start-up time 1.9s (typical)
Data refresh rate 1.7s (typical)
Service connector HP21
Interface type UART (Universal Asynchronous Receiver Transmitter)
Maximum service cable length 5 m (16.4 ft)
General specifications HP21
Display LC, 1 or 2 decimals resolution, backlight, trend, alarm and low battery indication
Probe material Polycarbonate
Probe dust filter material Polyethylene
Housing material ABS
Housing protection grade IP 40
Overall dimensions 270 x 70 x 30 mm (10.63 x 2.76 x 1.17 ”)
Probe dimensions 80 x 15 mm (3.15 x 0.59”)
Weight About 198 g (7.0 oz)