Specifications

100 Commerce Way, Woburn, MA 01801
TEL: 1-888-VAISALA (824-7252) FAX: [phone]
E-MAIL: [e-mail] Access catalog on-line at: www.vaisala.com/inc/ssdcat
28
Measured Variables
Relative Humidity
Measurement range 0...100%
Accuracy (including non-linearity and repeatability)
Maximum achievable when calibrated against high
quality, certified humidity standards: ±1 %RH (0...90% RH)
±2%RH (90...100% RH)
When calibrated against
salt solutions (ASTM E104-85) ±2 %RH (0...90% RH)
±3 %RH (90...100% RH)
Response time (90%) at +68°F (+20
0
C)
in still air (w/sintered filter) 15s
Sensor HUMICAP
®
K
Re-gaining sensor HUMICAP
®
KC
Temperature
Measurement range -40...+140°F (-40°...+60°C)
Accuracy at +68°F (+20
0
C) 0.36°F (±0.2°C)
Sensor PT 100 RTD IEC 751 1/3 Class B
Typical temperature 0.005°F/°F (0.005°C/°C)
dependence of electronics
Calculated Variables
Typical ranges:
dewpoint temperature -40...+140°F (-40...+60°C)
mixing ratio 0...160 g/kg d.a.
absolute humidity 0...160 g/m
3
wet bulb temperature 32°+140°F (0...+60°C)
enthalpy -40...+460 kJ/kg (-17.2...+198.8 BTU/lb)
The accuracies of these calculated values are limited by the
accuracies of the measured variables on which they are based,
namely RH and T. The RH and T accuracies are stated above
under Measured Variables.
Outputs
Two analog outputs selectable 0...20 mA 0...1V
and scaleable 4...20 mA 0...5V
0...10V
Serial output available RS 232C, RS 485/422 or
digital current loop
General
Connections screw terminals for 0.5 mm
2
wires (AWG 20)
Operating voltage 24 VDC/VAC (20...28V)
Power consumption (standard configuration)
100 mA maximum
Recommended external load
for current outputs < 500 ohm
Recommended external load
for 0...1V ouput > 2 kohm
Recommended external load
for 0...5 and 0...10 V outputs > 10 kohm
Operating temperature range
for electronics -40...+140°F (-40...+60°C)
Storage temperature range 40...+158°F (-40...+70°C )
Housing material G-AlSi12 (DIN 1725)
Housing classification NEMA 4 (IP 65)
Bushing for 7...10 mm diameter
cables (8 x 0.5 mm
2
shielded cable)
Sensor protection stainless steel sintered filter
(ø 13.3 mm) PPS grid with stainless
steel netting
Meets EC requirements on electromagnetic compatibility
(10V/m to 3V/m) depending on the filter.
Specifications subject to change without further notice.
HUMICAP
®
is a registered trademark of Vaisala.
65
145
120
29
120
Ø 13.5
104
133
Ø 6.5
HMP 231
Dimensions in mm
1/2 NPT conduit fitting
adapter available
TECHNICAL DATA - HMP 231
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