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
32
Measured Variables
Relative Humidity
Measurement range 0...100% RH
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
(with sintered filter) 15 s
Sensor HUMICAP
®
K
Re-gaining Sensor HUMICAP
®
KC
Temperature
Measurement range -40...+356°F (-40°...+180°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 dependence of electronics 0.005°F/°F
0.005°C/°C
Calculated Variables
Typical ranges:
dewpoint temperature -40...+212°F (-40...+100°C)
mixing ratio 0...500 g/kg d.a.
absolute humidity 0...600 g/m
3
wet bulb temperature 32212°F (0...+100°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/RS 422
digital current loop
Alarm relays* 2 relays 8A/230VAC/24VDC SPCO**
General
Connections screw terminals for 0.5 mm
2
wires (AWG 20) stranded
wires recommended
Operating voltage 24 VDC/VAC (20...28V)
Option 115 VAC, 230 VAC
Power consumption (standard configuration) 100 mA maximum
Recommended external load
for current outputs < 500 ohm
Recommended external load
for 0...1V output > 2 kohm (to ground)
Recommended external load
for 0...5 and 0...10 V outputs > 10 kohm (to ground)
Operating temperature range
for electronics -40...+140°F (-40...+60°C)
with display cover 32...+122°F (...+50°C)
with power supply unit -40...+113°F (-40...+45°C)
Storage temperature range -40...+158°F (-40...+70°C )
Pressure range of HMP 234 0...10 MPa (0...100 bar)
absolute pressure
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)
Cable lengths 2, 5, or 10 meters
Sensor protection sintered filter of
(ø 13.5 mm) stainless steel
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.
1/2" NPT conduit fitting adapter available.
65
145
120
104
133
Ø 6.5
Fitting body hex=27
Nut hex=32
cable length 2000,
5000, 10000
170
120
29
14
threading is NPT 1/2 - 14 fitting (M22 x 1.5 optional)
Ø 13.5
or 15000 mm
TECHNICAL DATA - HMP 234
* Simultaneous installation with alarm outputs and internal power
supply module is not possible.
** SPCO = single pole change over
HMP 234
Dimensions in mm
cable length 2, 5 or 10 meters
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