Series RH

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Series RH

• Relative Humidity/Temperature
• Transmitters

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What is Relative Humidity?

• Relative humidity (RH) is the amount of water
  vapor in a given volume of air compared to the
  amount of water vapor the same volume of air will
  hold at saturation (100 RH) at a given
  temperature.

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Relative Humidity

• The moisture holding capacity of air increases
  with increasing temperatures.
• Relative humidity is low in cold weather.

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Why is RH Important?

• Air is a vital component of our everyday lives.
• The amount of water vapor in the air effects our
  comfort levels and productivity.
• Humidity conditions also effect manufacturing
  processes and equipment.

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Why is RH Important?

• Too much water vapor produces condensation
  problems, product instabilities, inefficiencies,
  increased bacteria growth and adverse health
  conditions.
• Too little water vapor produces static
  electricity, product instabilities,
  inefficiencies, ozone production, virus
  propagation and adverse health conditions.

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Why is RH Important?

• A direct relationship exists between the
  psychological well being of employees and the
  environment in which they work.

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Why is RH Important?

• When the indoor relative humidity drops below
  40, the incidence of absenteeism and respiratory
  illness increases.

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Why is RH Important?
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ApplicationsBuilding Automation Systems

• Maintain optimum RH levels in office buildings
  and schools for comfort and increased
  productivity.

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ApplicationsBuilding Automation Systems

• Humidity is controlled in hospitals to decrease
  the spread of germs and viruses.

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ApplicationsOffices

• Dry air in the winter increases the level of dust
  present in the air. Air quality can be improved
  with correct humidification. Personal comfort and
  well being can be maintained.

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ApplicationsBusiness/Office Equipment

• Static electricity (due to low RH levels) can
  cause paper sheets to stick together, jamming
  photocopiers, fax machines, and printers.

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ApplicationsComputer Rooms

• Lack of proper humidity levels can cause dust
  buildup on heads, circuit board failure, and
  storage tape breakage.

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ApplicationsEconomizers

• Air Economizer Systems takes advantage of
  favorable weather conditions to reduce
  mechanical cooling by introducing cooler outdoor
  air into a building (termed free cooling).

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ApplicationsEconomizers

• An economizer is a collection of dampers,
  actuators, temperature and humidity sensors, and
  logic devices that work as a system to decide how
  much outside air to bring into the building.

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ApplicationsEconomizers

• Economizers are typically packaged in rooftop air
  conditioning units.
• In certain climates, an economizer system can
  reduce costs and the need for mechanical cooling
  by up to 75.

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ApplicationsManufacturing Facilities

• Dry air can cause static electricity in
  manufacturing plants. Reduced efficiency of
  production machinery is frequently the result of
  static electricity.

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ApplicationsFinished Goods Storage

• Control the moisture content in finished
  products.

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ApplicationsRaw Material Storage Areas

• Maintain RH levels so no moisture is emitted or
  absorbed by the materials. Materials remain
  stable in both moisture content and dimension.

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ApplicationsClean Rooms

• Poor control of the humidity in clean rooms
  involves the accumulation of static electricity,
  which when discharged may damage electronic
  components.

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ApplicationsProduct Integrity

• All hygroscopic or fibrous materials either lose
  or gain moisture in direct relation to the
  relative humidity of the surrounding air. Wood,
  paper, and textiles are materials particularly
  affected by changes in moisture content.

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ApplicationsWoodworking

• Controlling the humidity during the drying
  process of wood, allows the wood to maintain the
  same dimensions throughout the entire process,
  ensuring better results.

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ApplicationsPrinting

• The humidity in the environment can change the
  width and length of a reel of paper by several
  centimeters. Appropriate humidity control ensures
  the paper dimensions remain the same throughout
  the printing process and limits any downtime
  during production.

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ApplicationsTextiles

• If textile fibers are too dry when they are run
  through the looms, they become fragile and break,
  leading to stoppages, downtime, and slow down in
  production.

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ApplicationsMicrochip Manufacturing

• Absorption of moisture can lead to variations in
  dimensions.
• Chips are becoming increasingly smaller. For this
  reason, even slight variations in the dimensions
  of a silicon wafer during the photographic
  masking process causes unacceptable misalignments
  and subsequent malfunction of the components.

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Applications Industrial Ovens and Dryers

• Control humidity in meat dryers and industrial
  ovens to maintain appearance and color of the
  product.

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ApplicationsDrying Process

• Monitor the moisture levels during the drying
  process of tobacco and grains

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ApplicationsProduct Integrity

• Any product purchased or sold by weight must have
  a carefully controlled environment.

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ApplicationsProduct Integrity

• The humidity in walk-in humidors and wine cellars
  must be carefully controlled.

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ApplicationsDefense

• Humidity control is considered of maximum
  importance for the new stealth technology. The
  paint used is very sensitive to humidity. If it
  polymerizes incorrectly due to a dry environment,
  it will crumble, leaving the metal exposed to the
  reflection of radar waves.

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ApplicationsFood Processing

• Meats, cheeses, breads, fruits and vegetables can
  dry out if too much moisture is lost. It is
  important foodstuffs be humidified from the
  moment they reach the store to when they are
  purchased by the consumer.

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ApplicationsPreventative Maintenance

• Museums and libraries must be kept at a constant
  humidity to maintain the integrity and promote
  longevity of artifacts and literary works.
  Uncontrolled humidity can cause blistering,
  flaking, cracking, etc.

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ApplicationsGreenhouses

• Maintain proper relative humidity levels in
  greenhouses.

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ApplicationsLivestock Buildings

• In livestock buildings, moisture, temperature,
  odors, and toxic or noxious gases must be
  controlled.

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ApplicationsEnvironmental Chambers

• Environmental chambers require precise humidity
  control.

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ApplicationsIndoor Swimming Pools and Spas

• Monitor humidity in indoor swimming pool areas.

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Series RH

• Wall Mount
• Duct Mount
• Outside Air Mount

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Series RH Features

• Low-Cost
• Local Measurement Indication with Built-in Dual
  Display
• 10 to 35 VDC Power Requirement
• Quick Response Time
• 4-20 mA Output
• No Field Calibration Required

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Series RH Features

• Selectable Degrees C or F
• Deep Insertion Length, Probe is 9" Long
• Duct Mount, Wall Mount or OSA Versions
• Capacitive Humidity Sensor
• Solid State Temperature Sensor
• Both Sensors Integrated on Same Chip

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Series RH Features

• The Sensor is Not Light Sensitive
• Not Affected by Condensation
• Excellent Long Term Stability
• Simple Wiring Configuration
• Adjustable Insertion Depth

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Series RH Features

• Save on installation costs by using the
  combination Series RH Humidity/Temperature Models.

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Series RH Specifications

• Humidity Limits 0 to 100.
• Temperature Limits -40 to 60C (-40 to 140F).
• Resolution 1 digit.
• Accuracy 2 RH 0.3 C _at_ 25C ( 0.9F between
  40F and 104F).
• Output 4-20 mA.
• Power Supply 10-35 VDC.

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Series RH Specifications

• Response Time 4 seconds for RH 30 seconds max.
  for temperature.
• Stability lt0.5 RH/yr.
• Approval CE.