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)
