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 211 Dew point sensor with optional display
Sigma 211 provides reliable and long term stable dew point monitoring in industrial applications, with a range of -60 … +20 °C Td. It makes it an ideal choice for dew point measurements in
desiccant dryers.
The new generation of the dew point sensors offering compressed air users a plug & play solution to monitor their compressed air quality according to the ISO 8573-1.All transmitter models are
available with 2-wire or 3-wire analog 4… 20 mA output signals, in addition to that the models are available with a Modbus/RTU digital interface. By offering different output signals users can
profit from great flexibility and seamless integration into their process.
Additionally the dew point sensors are offered with an integrated pressure sensor, combining a pressure and dew point sensor into a single instrument. The optional OLED display directly mounted
on the sensor provides on-site real time values. The display can be easily rotated by 340 ° to fit in any application.
The main body is made from high class aluminium alloy with a soft finish. The process connection is a 1.4301 (SUS 304) stainless steel connection, made to last forever. Top cover made from aluminium at the same quality as the main body. The optional display cover is made from robust Polycarbonate with ABS reinforcement to withstand the rough environment.The new generation are the successors of the well known previous dew point sensor, which have satisfied users for many years.
The new sensors have been redesigned from ground up, integrating the latest technology and all our experience, still they are fully backwards compatible to existing installations.
Features
• For Desiccant Dryers with a measurement range of -60 … +20°C Td.
• Compact size makes them ideal for dryer installations.
• Optional display for on-site values.
• Display can be rotated by 340° to fit your needs.
• User friendly signal outputs: 2-wire analog 4… 20 mA or 3-wire analog 4…20 mA + Modbus/RTU.
• IP65 casing provides robust protection.
• Low maintenance costs due to stable and reliable measurements which increase calibration intervals.
• Measured values available in several units: °C Td • g/m³ • mg/m³ • ppmv • g/kg (@ reference pressure) • % RH.
Sigma 212 dew point sensor (-50 … +20° Ctd or -20...50°Ctd)
Dew point sensor for monitoring desiccant dryers
Sigma 211 Sensor provides reliable and long term stable dew point monitoring in industrial applications, with a range of -60 … +20 °C Td. It makes it an ideal choice for dew point measurements in
desiccant dryers.
The new generation of the dew point sensors offering compressed air users a plug & play solution to monitor their compressed air quality according to the ISO 8573-1.All transmitter models are
available with 2-wire or 3-wire analog 4... 20 mA output signals, in addition to that the models are available with a Modbus/RTU digital interface. By offering different output signals users can
profit from great flexibility and seamless integration into their process.
Additionally the dew point sensors are offered with an integrated pressure sensor, combining a pressure and dew point sensor into a single instrument. The optional OLED display directly mounted
on the sensor provides on-site real time values. The display can be easily rotated by 340 ° to fit in any application.
The main body is made from high class aluminum alloy with a soft finish. The process connection is a 1.4301 (SUS 304) stainless steel connection, made to last forever. Top cover made from
aluminum at the same quality as the main body. The optional display cover is made from robust Polycarbonate with ABS reinforcement to withstand the rough environment. The new generation are the
successors of the well known previous dew point versions, which have satisfied users for many years.
The new sensors have been redesigned from ground up, integrating the latest technology and experience, still they are fully backwards compatible to existing installations.
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 220 Dew point sensor (-100 … +20 ºCtd)
The Sigma 220 Dew point sensor provides reliable and long term stable dew point monitoring in industrial applications. Sigma 220 is using a new sensor technology which has superior signals at very low moisture levels thus providing reliable measurements down to –100 ºC.
A stainless steel mesh filter with pore sizes below 1 um protects the sensor from particles. It’s designed for applications where very low moisture levels needs to be detected.
The measured dew point is output through a 4-20 mA signal (3-wire or loop powered). Sensor parameters such as analogue output scaling, physical units, can be easily changed by using a service kit.
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
Features
- Small size makes it ideal for dryer installations
- Measures dew points down to –100 ºC
- New sensor technology
- Version with integrated pressure measurement
- Various output versions available: 1 x 4…20 mA, 2 x 4…20 mA, RS-485 (Modbus), 4…20 mA loop powered
- Very fast response time ensures safe and reliable indication whenever dew points are out of valid ranges
- IP65 casing provides robust protection in rough industrial environment
- Can be installed directly into dryers through G 1/2” thread
- High accuracy of 2 ºC dew point
- M12 connector
Sigma 220 is powered by a current loop, and three 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
Some common applications for compressed air dew point measurement in explosive areas include Chemical Processes, Hydrogen Cooling Systems, Spray Painting and Coating, Oil and Gas Drilling, Mining and Tunneling, Chemical Storage and Transport,
Aerospace and Defense..