MEASURING HUMIDITY IN MANUFACTURING from Western Tool Company

Humidity Measurement

Guest Post By Rolandas Obsta
The measurement of pressure dew point in compressed air systems or gas distribution networks has become more important recently. Manufacturers worldwide are getting aware of negative effects of having too much moisture in the air / gas pipes, as it can cause:

• Corrosion in the pipes
• Reduces lifespan of pneumatic parts
• Failures in actuators
• Contamination of compressed air system in general
• Unscheduled production stops.
• Incalculable additional production costs

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Dryers used to remove moisture from gas, are not always performing as they intend to do, mostly caused by a poor maintenance. Humidity measurement acts as a kind of insurance system, monitoring the dryer performance and indicating alarms whenever values are out of valid ranges. As a result it provides:

• Fast responses to failures in compressed air drying through permanent monitoring of pressure dew point.
• Increase the lifespan of compressed air system and it components.
• Make maintenance of the compressed air system more efficient.
• Ensures stable quality of products through less problems in operation of the system

But humidity measurement is not only restricted to applications in air / gas drying. There are many more processes in industry where a well monitored dew point is crucial for the overall process and the quality of the products.
Applications for dew point monitoring:

• Plastic injection and blow molding
• High voltage switch gears and transformers
• Spray painting process
• Bottle filling
• Medical gases
• Pipeline drying

Compressed air is used in brake systems and door openers of rail vehicles. It has to be free of any condensate otherwise the brake system and the pneumatic door openers may freeze in winter and corrosion damages in the distribution network and at pneumatic components (cylinders, valves) can occur. For this reason a regular dew point measurement is essential.
The humidity sensor provides reliable and long term stable dew point monitoring in industrial applications. The newly developed sensor features improved signal and stability in demanding industrial applications. Drifts caused by temperature changes, dust and aging are eliminated by the electronics providing reliable measurements. Recalibration interval thus could be increased to 2 years.
The measured dew point is output via a 4-20 mA signal output. The integrated display shows online measurement values and alarm status. One alarm can be programmed which will activate a relay.
Benefits

• Humidity sensor for low dew point applications down to -80 �C
• Graphic display, relay output
• IP65 casing provides robust protection in rough environment
• Very fast response time ensures safe and reliable indication
• Can be installed directly into dryers through G 1/2" thread
• High accuracy of �2 �C dew point

Company Riveja specializes in test and measurement systems and equipments for industrial use. Our product range covers everything from transducer to the full size production tests solutions. We design and manufacture customized test and measurement systems. Our services include automation design, manufacturing and commissioning. Riveja's measurement solutions are mainly used in product development, research and maintenance. Riveja has a wide selection of devices from transducer to the high-end analyzers. Typical measurable values are temperature, vibration, pressure, rotation, force, torque, strain and noise. Systems are widely used in vehicle- and defense industry, universities, research institutes, electronics and in machine building applications.
For more information please see: [http://www.riveja.lt]
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