Specifications

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E-MAIL: [e-mail] Access catalog on-line at: www.vaisala.com/inc/ssdcat
48
TECHNICAL DATA - HMW 21/31 SERIES
Relative Humidity
Measurement range 0 to 100 %RH
Accuracy at +68°F (+20 °C) ±2 %RH (0 to 90 %RH)
±3 %RH (90 to100 %RH)
(includes calibration uncer-
tainty, non-linearity, non-
repeatability)
Temperature coefficient ±0.02%RH/°F s(±0.04%RH/°C)
90% response time 15 sec with protective filter
Sensor HUMICAP
®
H
Temperature (HMW 21YB and HMW 31YB)
Electronics accuracy at +68°F (+20 °C) ±0.36°F (±0.2 °C)
Temperature coefficient ±0.02°F/°F (±0.02°/°C)
Linearity better than 0.18°F (0.1 °C)
Sensor Pt 100 IEC 751 1/3 Class B
General
Electrical connections Screw terminals for wires
0.5...1.5 mm
2
(AWG 20...16)
Housing material ABS plastic (NEMA 4)
Sensor protection Ø 18 mm membrane filter or
sintered filter (optional)
Operating temperature range
Electronics +23 to +131 °F (-5 to +55 °C)
Measurement range -4 to +176 °F (-20 to +80 °C)
HMW 21UB and HMW 21YB
Input voltage: 10 to 35 VDC (R
L
= 0 ohms)
20 to 35 VDC (R
L
= 500 ohms)
Output signals 4 to 20 mA
HMW 31UB and HMW 31YB
Output Supply Voltage
DC DC AC
0 to 1V 10 to 35V 9 to 24V
0 to 5V 13 to 35V 11 to 24V
0 to 10V 18 to 35V 15 to 24V
0 to 20mA 10 to 35V 9 to 24V (R
L
= 0 ohm)
0 to 20mA 19 to 35V 16 to 24V (R
L
= 500 ohm
Specifications subject to change without notice.
HUMICAP
®
is a registered trademark of Vaisala
4
62
86
HMW 21 and HMW 31 Series
Dimensions in mm
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