GE
Sensing
Portable and Precise
Humilab™
General Eastern Relative
Humidity Generator and
Calibration Chamber
Humilab is a General Eastern
product. General Eastern has joined
other GE high-technology sensing
businesses under a new name_GE
Industrial, Sensing.
• Primary standard: Integrated chilled mirror and
platinum RTD constantly measure test conditions
• Precise: ±0.2% RH stability
• Accurate: ±1% RH from 10% to 70% RH and ±1.5% RH
from 70% to 90% RH
• Versatile: 10% to 90% RH and 20°C to 30°C
• Self-contained operation: Equipped with desiccant and
water reservoir
• Connects to temperature bath/circulator to
standardize test conditions
• Connects to dry compressed air to extend desiccant
life indefinitely
• Records and documents: 0 to 5 VDC, 4 to 20 mA
analog outputs and RS-232 digital data stream
• Fast response: 10 minutes for 63% step change and
30 minutes to full stability
• Quality design: Stainless steel chamber
• Instant-on fittings for external dry air, circulation of
temperature controlled water and reservoir drain
• Cost effective: Ability to calibrate several %RH
instruments at once
• Ease of operation: Set to value you need by the front
panel or via PROSTEP software for ramp and soak
profiles
• Bright, easy to read control panel
• Equipped with transportation case
g
GE
Sensing
Document and Standardize
• Calibration labs
• HVAC and BAS transmitters
• Pharmaceutical instruments
• %RH data loggers
• %RH recorders
• Industrial humidity probes
• Test humidity sensors
• Metrological and radiosonde sensors
The Humilab employs the time-proportioned divided flow
method to generate relative humidity values from 10%
to 90% RH. Unlike other humidity chambers that use
secondary %RH sensors, pressure transducers or
wet/dry bulb temperature sensors, the Humilab has a
built-in primary humidity reference standard. %RH is
calculated from the fundamental chilled mirror dew
point and platinum RTD temperature measurements. The
chilled mirror sensor and RTD are in the same
environment as the devices under test. The relative
humidity is controlled, regulating a fraction of a constant
flow of dry air through a saturator. The dry air is
produced with an internal pump and desiccant cartridge.
The air streams are temperature-conditioned and mixed
to maintain the desired RH level in the test chamber.
Repeatable and Economical
The Humilab is a NIST-traceable relative humidity
generator and calibration chamber that is continuously
monitored and controlled by a chilled mirror hygrometer
and precision RTD. The system is water jacketed for
thermal stability and facilitates cost-effective
calibrations of relative humidity sensors, probes,
transmitters, recorders and data loggers.
Since the volumetric mixing ratio is a time-based control,
the system is highly repeatable. The chamber is
sufficiently sized for several test articles at once. The
Humilab has an inlet for dry compressed air, which
extends the life of the desiccant indefinitely. The water
jacket may be connected to a temperature-controlled
water bath/circulator to provide standardized test
Primary NIST-Traceable Calibration
The system is supplied with a certificate of calibration
and functional test data.
Prostep software enables “ramp and soak” humidity and temperature
prof iles to be loaded into the Humilab. Prostep also features data
logging. The chamber conditions are recorded as time-based ASCII data,
which can be opened in spreadsheet programs such as Excel.
conditions. The test chamber has been thermally
mapped to confirm temperature uniformity of better
than 0.2°C. Humilab provides analog and digital outputs
(RS232) to facilitate data logging and recording. The %RH
set point can be selected from the front panel or ramp
and soak profiles may be uploaded to the Humilab using
Prostep software. Prostep also provides data logging via
the RS232 data port. Test data may be saved to a PC as
ASCII data, which can be imported into standard
spreadsheet programs such as Excel.
The graph above was produced with data from the Humilab. The
calibration system provides stability of better than ±0.2% RH.
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GE
Sensing
Humilab
Specifications
%RH Range
10% to 90% RH at 77°F (25°C)
Temperature Range
60°F to 86°F (20°C to 30°C)
May be used with temperature controlled water
bath/circulator. Humidity limited by surface temperature
of internal walls and cover (dew point in chamber must
be less than interior surface temperature to avoid
condensation).
Response Time
10 minutes for 63% step change. 30 to 40 minutes to full
stability.
Accuracy
±1% RH from 10% to 70% RH and 1.5% RH from 70% to
90% RH
±0.3°F (0.15°C) dew point and 0.3°F (0.15°C) dry bulb at
77°F (25°C)
Analog Output
Two-user scalable 4 to 20 mA/0 to 5 VDC signals for
temperature, humidity and temperature
Power
115 or 230 VAC ±10%, 50/60 Hz. Single phase
Digital Interface
(2) RS232 ports. Reference and generator interface
Prostep Software
Windows®95/98 and above required. Supplied on
CD-ROM with operation manual (PDF), and HCON
Humidity Conversion Software
Approvals
CE approved
Certifications
Supplied certificate of NIST traceability and functional
test data
Display
(3) LEDs, 0.5 in (12.7 mm) high 7 segment. Displays of set
point (%RH), actual %RH and temperature. 0.1%
RH/°C/°F resolution
Workspace Dimensions
11 in x 9 in x 6.5 in (279.4 mm x 228.6 mm x 165.1 mm)
approximately 644 in3(10.6 liters)
Overall Dimensions
23 in long x 19 in wide x 13 in high
(548.2 mm x 482.6 mm x 330.2 mm)
Chamber Material
Stainless steel with aluminum I/O block
Water Jacket
Stainless steel. Water capacity 2.2 gallons (8.3 liters)
Mechanical I/Os
Fill port. 1/4 in (6.35 mm) OD tubing instant-on fittings for
water circulation (inlet and outlet), water drain (enables
water to be gravity drained) and dry air inlet
(compressed dry air to be regulated to <5 psi)
Weight
66 lbs (30 kg) dry weight
19 in
(482.6 mm)
23 in
(548.2 mm)
13 in
(330.2 mm)
GE
Sensing
g
Humilab
Specifications
©2004 GE. All rights reserved.
920-075B
All specifications are subject to change for product improvement without notice.
Humilab™ is a trademark of GE. Windows®is a registered trademark of Microsoft
Corporation, which is not affiliated with GE, in the U.S. and other countries. Lexan
®
is a registered trademark of GE Plastic. GE® is a registered trademark of General
Electric Co.
Electrical I/Os
Power_IEC receptacle. Sub-DB-15 for analog outputs.
Sub-DB-9 for RS232
Water Capacity Indicator
Liquid sight glass-color indicator
Desiccant
Indicating type. Bright blue when dry. Pink when
saturated. Chamber runs 24 hours at 50% RH and 77°F
(25°C) on a new charge of desiccant. Dry compressed
(-40°F/-40°C dew points or drier) extends desiccant life
indefinitely
Ordering Information
HUMILAB-115
115 VAC, 50 to 60 Hz
HUMILAB-230
230 VAC, 50 to 60 Hz
CAL-3
Prepaid three year annual calibration service. 20%
savings over standard recertification costs
Accessories
RTE
Temperature controlled refrigeration and heating bath
circulator
DES-CAR
Spare desiccant cartridge
B-DES
Bulk desiccant, 5 lb (2.27 kg)
HLAB-CVR
Spare Lexan®cover (may be drilled to accommodate
various probes)
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