GE
Sensing
Telaire Vaporstat 9002 is a Telaire
product. Telaire has joined other
GE high-technology sensing
businesses under a new
name
_
GE Industrial, Sensing.
g
Infrared Dew Point
Sensor
Features
• A break-through in low cost reliable dew point
sensing
• Unprecedented 15 year sensor life
• Non-interactive sensing technology that can’t be
poisoned or saturated
• Can be field calibrated to an easy-to-use National
Institue of Standards and Technology (NIST)
reference standard in less than 15 minutes
• Easily applied to indoor, outdoor or in-duct
measurements
Introducing a New, Reliable Technology to Measure
and Control Moisture
Developed with the assistance of the: U.S. DOE, Desiccant
Technologies program, Oak Ridge National Laboratories
Control Humidity, Ensure Comfort and Prevent Mold
Growth in:
Supermarkets and Big Box Retail schools, offices, hotels,
restaurants, museums/art galleries, ice arenas,
laboratories and clean rooms
Telaire
®
Vaporstat
™
9002
GE
Sensing
New Dew Point Sensor
The Vaporstat is the first commercial infrared dew point
sensor. The Vaporstat is a new generation, low-cost
moisture sensing device that directly measures water
vapor rather than relative humidity. A relative humidity
measurement reflects the amount of moisture air can
hold at a certain temperature. If the temperature
changes the relative humidity will change. In contrast,
the water vapor sensor measures the absolute amount of
water vapor in the air and is unaffected by temperature.
The Vaporstat provides a comparable performance to a
chilled mirror, but is a fraction of the cost and requires
considerably less maintenance.
Durable Sensor with a Fifteen Year Life
The Vaporstat is a durable dual beam infrared optical
sensor that cannot be saturated or poisoned by other
gases. There is nothing to repair or replace for the
15 year operating life of the sensor.
Eliminate Stacked Errors Related to Calculating Dew
Point
Many building control systems take temperature and
relative humidity and calculate dew point. If you can
measure water vapor in air with the Vaporstat, why rely
on the complex and imprecise calculation method
required when using combined sensors. Eliminate
stacked errors and gain precise and more effective
control, resulting in energy savings and increased
comfort.
Configure to Your Needs
The on board keypad allows for the sensor to be
configured to your needs. Correct for elevation, scale
measurement range and outputs or adjust the on-board
SPDT relay set points. Once installed you can lock the
sensor in place and choose to provide a visible or hidden
display. Telaire also offers options for duct mount and
outside air sensing.
In-Field NIST Calibration
Returning the unit for factory calibration is not necessary
if the NIST certified calibration can be verified in the field.
Each sensor is assigned a unique calibration curve based
on an NIST certified chilled mirror hygrometer. This
individualized calibration curve is stored in the sensors
permanent memory and will be valid for the life of the
device. The sensor’s NIST calibration can be verified or
reestablished by using a reference device or flowing gas
with a known water vapor concentration over a single
calibration point. Calibrating at a single point will
reestablish the sensor calibration to its original NIST
certified calibration points.
Explanation of Humidity Measurement
Terms
Humidity_Refers to the water vapor content in air or
other gases. Humidity measurements can be stated in a
variety of terms and units. The three commonly used
units of measure for humidity are relative humidity (RH),
dew point, and humidity ratio. Dew point and humidity
ratio are referred to as measures of absolute humidity
because the values are not relative to, or affected by the
air temperature.
Relative Humidity
_
Amount of water vapor air can hold at
a given temperature. Because this value has been so
easy-to-measure, and its values appear to correlate to
comfort, it’s use has become widespread by the general
public. As discussed in the ASHRAE Humidity Control
Design Guide* because “relative humidity changes widely
and constantly with temperature” it may not be the
appropriate humidity control parameter for many
applications.
Dew Point_Temperature water vapor in air begins to
condense to liquid. Like humidity ratio, it is an absolute
measure of water in air that is independent of
temperature. The lower the dew point the drier the air.
Dew point is a measure used in applications for humidity
control to avoid condensation of water on cooler surfaces
within a building (e.g. windows, refrigeration cases, inside
walls, electronic equipment, ductwork and grills). This type
of condensation can lead to discoloration, physical or
structural damage and mold and mildew growth).
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