What is the quality of your compressed air? Is Dry, Dry Enough?

prevent damage with Compressed Air Dew Point control

The modern production technology needs compressed air. The diversity of application starts with non processed blast air to absolute dry, oilfree and sterile compressed air. Irrespective of how it is used, compressed air has to be dry. Depending on the application considerable economical damage can be caused by uncontrolled humidity irruption into the compressed air system.

 

Reasons that can lead to an increased pressure dewpoint value within the compressed air system

  • Condensate at the refrigeration dryer (condensate eliminator faulty or dirty)
  • Condensate overload of the refrigeration dryer
  • Adsorption agent is not regenerated sufficiently
  • Compressed air bypass in the bypass (valve faulty or not closed)
  • Compressed air bypass in the refrigeration dryer (worn out, corroded etc.)

 

Water in compressed air leads to damages

  • Corrosion within the pneumatic plant - Rust will develop in the ducts and functioning elements and will lead to leakages.
  • Breakage of the lubricating film – Broken lubricating films lead to mechanical faults.
  • Building of electric elements.
  • Formation of ice in the compressed air system - At low temperatures the water within the compressed air system could freeze and cause frost damage, reduction of the diameter and blockades.
  • • Material handling - High humidity leads to conglutination of materials to be transported, e. g. sugar, concrete, granulate, etc.
  • Pharmaceutical -High humidity impairs powders, tablets, etc.
  • Hospital - DIN 13260, EN 737-3, danger of development of bacteria

 

The high quality standards in industry require the continuous monitoring of humidity with results which are reliable and invariable over a long period.

 

We provide stand-alone units or sensors with analogue output that can be intergrated in to a centrally controlled system.

 

THE Sigma 200 series

Sigma 201 Dew point sensors with display and alarm

The Sigma 201 Dew point transmitters provide 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 agιng are eliminated by the electronics providing reliable measurements. Recalibration interval could thus be increased to 2 years.

The measured dew point signal is via a 4-20 mA output. The integrated display shows online measurement values and alarm status. One alarm can be programmed which will activate a relay.

Sensor parameters such as analogue output scaling, alarm values, units, etc. can be easily changed by using a service kit. This kit is used to connect the sensor to a PC for configuration changes.

Features

  • Dew point transmitter for low dew point applications down to -60 ºCtd
  • Long term stability
  • Graphic display
  • Relay output
  • IP65 casing provides robust protection in rough industrial environment
  • Very fast response time ensures safe and reliable indication whenever dew points are out of valid ranges
  • Can be installed directly into dryers through G 1/2” thread
  • High accuracy of 2 ºCtd

 

alarm adjustable via keypad
alarm adjustable via keypad

Technical data S201

 

Measuring range                 -60 ... +20 ºCtd

                                                 0 ... 99.9 % rH

                                                 -30 ... 70 ºC

Accuracy                                  +/- 2 ºCtd (see table below)

Pressure range                     -0.1 ... 1.6 MPa

Power supply                         16 ... 30 VDC / 60 mA

Ambient conditions               0 ... 50 ºC

Response time                      t90:     0...-40 °C : 2 minutes

                                                  -40...0 °C : 20 seconds

Output signal                          4…20 mA, 3-wire

Relay NO, 32 VDC, 500 mA

Connection 2 x M12, 5 pole

Casing PC + ABS

Classification IP65

Process connection G 1/2” thread (ISO 228/1)

 

 

 

 

Sigma 212 dew point sensor                                             (-50 … +20° Ctd or -20...50°Ctd)

 

dew point sensor for monitoring membrane and adsorption dryers

 

The S212dew point transmitter 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. It makes it an ideal choice for dew point measurements in desiccant dryers. 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 compact size of the sensors make them an ideal choice for installations in tight environments

 

Technical Data

  • Measuring range -80...20 °Ctd or
                                    -20...50°Ctd
  • Accuracy 2 ºCtd (see table)
  • Pressure range -0.1 ... 1.6 MPa
  • Power supply 16 ... 30 VDC / 60 mA
  • Ambient conditions 0 ... 50 ºC
  • Response time < 30 sec (descending)
                                  < 10 sec (ascending)
  • Output signal 4…20 mA, 3-wire
  • Connection M12, 5 pole
  • Casing Zinc alloy, PC + ABS
  • Protection rating IP65

 

Sigma 215 / S417 dew point sensors                                (-20 … +50 ºCtd & -50 °C … +50 °C)

The Sigma 215 dew point 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. It makes it an ideal choice for dew point measurements in desiccant dryers.
The measured dew point is output via a 4 … 20 mA signal output. The compact size of the sensor makes it an ideal choice for installations in tight environments. Sensor parameters such as analogue output scaling, alarm values, units, etc, can be easily changed by using the service kit. This kit is used to connect the sensor to a PC for configuration changes.

Features

  • Dew point sensor for dew point applications down to -20 °C
  • Long term stability
  • IP65 casing provides robust protection in rough industrial environment
  • Fast response time ensures safe and reliable indication whenever dew points are out of valid ranges
  • Can be installed directly into dryers through G 1⁄2” thread
  • High accuracy of ±2 °C dew point

Sigma 217 OEM Dew point sensor (-50 °C … +50 °C)

The Sigma 217 dew point 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.
It’s designed for OEM applications in desiccant and refrigeration dryers. Through our new sensor technology paired with a compact casing, Sigma 217-OEM can be offered at very attractive prices. This allows applications in smaller dryers and point of use dryers using a more energy efficient dew point control. The measured dew point is output via the loop-powered 4 ... 20 mA signal or 3 wire 4 ... 20 mA output. Sensor parameters such as analogue output scaling, physical units, can be set ex factory.

Features

  • Small size makes it ideal for dryer installations
  • Measures dew points down to -50 °C
  • 2-wire or 3-wire output
  • IP65 casing provides robust protection in rough industrial environment
  • Very fast response time ensures safe and reliable indication whenever dew points are out of valid ranges
  • Can be installed directly into dryers through G 1/2” thread
  • High accuracy of 1 °C ... 2 °C dew point
  • Withstands condensation
  • M8 connector and cable with open wires

Measuring Chambers for various applications

A measuring chamber is used for optimum flow past the dew point sensor, sensor protection and fast installation/removal with compressed air quick connection.

 

Note: When installing the measurement chamber, please do not turn the transmitter housing, but block the nut with a spanner and screw the chamber onto the thread.

 

 

Standard measuring

chamber for compressed

air up to 16 bar

 

High-pressure meas.
chamber for compressed

air up to 350 bar*

 

Meas. chamber for
granulate dryers up
to 250 mbar

Meas. chamber for

atmospheric dew

point

 

Meas. chamber for

respiratory air

bottles up to 350 bar*

 

* in case of pressures

higher than 50 bar please
order special version Η300

Sigma 305 Dew Point Monitor -20 ... +50 °C & -50 ... +20 °C

Refrigerated-Dryers are among the most used dryers in compressed air. Many of these dryers are not performing as intended, too often a lack of maintenance and quality issues result in very high dew points and water in the pipes. In other words: Energy is used for nothing. The dew point indicator at the dryer is not really measuring the dew point but the evaporation temperature. Only the "real"dew point measurement of the outlet air provides reliable results.

The All-In-One solution allows a convenient and price attractive dew point monitoring of refrigerated dryers. Alarm indications offer a timely maintenance avoiding costly system shut downs.

Under normal operation conditions S305 can be used for 2 years without any re-calibration.

Stated accuracy under following conditions:
• Ambient temperature 23 +/- 3 ºC
• Process temperature 23 +/- 3 ºC
• Ambient humidity <95%, no condensate
• Airflow > 1 l/min at sensor tip

Technical information

Measuring range: -20..+50°C & -50..+20°C
Accuracy: 1 ... 2 °C dew point
Pressure range: -0.1 ... 5.0 MPa
Power supply: 100 ... 240 VAC or 24 VDC
Measured gas: Non-corrosive gasses
Ambient conditions: -10 ... 40 °C
Transport: -30 ... +70 °C
Response time t90: < 30 sec (descending)
< 10 sec (ascending)
Output signal: 4 ... 20 mA
Gas connection 6 mm hose quick connector
Cable glands: 2 cable glands for supply and signal cable
Casing Process connection: stainless steel
Casing: AI alloy, ABS
Classification: IP65
Sensor protection: Stainless steel sinter cap pore size < 30 um
EMC: According to IEC 61326-1

Α red light and buzzer alarm, wall mountable version is also available.

The unit is using the relay outputs of S305 to trigger the alarm

Measurements in explosive areas

Sigma 230/231 DEW POINT SENSORS                       (-100º ... +20ºC) - ATEX

The 230/231 series dew point sensors provide reliable, long term stable dew point monitoring in industrial or
hazardous applications. The unique dual sensor technology optimizes sensor sensitivity and accuracy by
automatically selecting the ideal sensor type for the situation.
The S230/231 is provided ready to use and is simple to install with your choice of 4-20mA or Modbus RTU (RS485) outputs. 

 

Features / Benefits
• Dew point sensor with optional ATEX, IECEx
• Dual sensor technology for high accuracy of 2°C over the whole range from –100° ... +20°C
• Two outputs available: 4 ... 20 mA, RS-485 (Modbus RTU).
• IP65 casing provides robust protection in rough industrial environment