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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 H400 series
H400
The dew point transmitter Η400 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.
Η400 features a complete dew point meter with sensor, display, keyboard and alarm. The keyboard is placed behind a rubber cover and can be accessed by opening the cover on the top. Via two keys alarms and display features can be set.
Features
- Dew point transmitter for low dew point applications down to -80 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
Technical data H400
Measuring range -80 … +20 ºCtd
0 … 100 % 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 < 30 sec (descending)
< 10 sec (ascending)
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)
H410 dew point sensor (-80 … +20° Ctd or -20…50°Ctd)
dew point sensor for monitoring membrane and adsorption dryers
The Η410dew 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
Features
- Dew point transmitter for low dew point applications down to -80 ºCtd
- Long term stability
- 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
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
H415 / H416 dew point sensor (-20 … +50 ºCtd)
The H415 / H416 dew point transmitters provide reliable and long term stable dew point monitoring in industrial applications. With these new models dew point measurement in refrigerant dryers becomes affordable and can replace traditional temperature measurement which often couldn’t tell the real dew point. H415 outputs the measurement value through the loop powered 4 – 20 mA signal.
The model H416 is designed as a dew point switch, featuring a dew point distance monitoring, triggering an alarm when the dew point distance (ambient temperature – dew point temperature) is below a programmed limit. Alternatively this sensor can be programmed to monitor a dew point level (e.g. +6 ºC for refrigerant dryers) or the relative humidity.
An alarm will activate the internal solid state relays of the sensor and the bright LED will change from green to red color.
Features
- Affordable dew point transmitter for mid range applications such as refrigerant dryer monitoring
- Long term stability
- 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… 2 ºCtd (see chart below)
- On site recalibration and check with our calibration kit
Technical data H415 / H416
Measuring range -20 … +50 ºCtd
0 … 100 % rH
-30 … 70 ºC
Accuracy 1 … 2 ºCtd (see table below)
Pressure range -0.1 … 1.6 MPa
Power supply 10 … 30 VDC
Ambient conditions 0 … 50 ºC
Response time < 30 sec (descending)
< 10 sec (ascending)
Output signal 4…20 mA two-wire (H415)
60 V, 0.5 A Relay (H416)
Connection M12, 5 pole
Casing Zinc alloy, PC + ABS
Classification IP65
Process connection G 1/2” thread (ISO 228/1)
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
Measurements in explosive areas
H-300-2ex
The H300-2 Ex measures the dew point respectively the pressure dew point in explosive areas of the zone 1.
Protection class:
H300-2 Ex: II 2 G EEx ia IIC T4.
Requirements for installation in hazardous area Zone 1
Humidity / Dew point transmitter H300-2 Ex is only allowed to be connected to an intrinsic safe circuit, in which an electrically isolated supply and signal circuit in the power supply is preferred. Equipment without electrical isolation according to EN 50020 must not be used, if a potential equalization occurs along the wire. The related requirements according to EN 60079-14 have to be met.
Uo = 30 V max. Io = 100 mA max. Po = 1 W max.
The maximum effective inner capacity is 17 nF, the maximum effective inner inductance is neglectable.
Special advantages:
- robust design
- pressure tight up to 300 bar
- long- term stable humidity sensor, established for years
- 4 to 20 mA analog output in 2-wire technique
- PC service software SFA 300 for data storage and calibration available
- Special scaling option, output settings in g/kg, g/m3; %RH, ppmV, mg/m3instead of °Ctd
These humidity sensors, will offer a high level of stability over long periods, and the internal automatic calibration provides reliable measuring results.
