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When compressed air is cooled, the relative humidity increases. As the temperature continues to drop and the relative humidity reaches 100%, water droplets begin to condense out of the compressed air. The temperature at this point is known as the "pressure dew point" of the compressed air
Sensor Model | FIXINST-P | FIXINST-A | FIXINST-Q |
Sensor Type | Polymer Capacitive Sensor | Aluminum Oxide Sensor | QCM Sensor |
Sensor Appearance |
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Applicable to > -60 °Ctd ： | √ | ||
Applicable to -80 … -40 °Ctd： | √ | ||
Applicable to -120 … -60 °Ctd： | ○ | √ | |
Containing Contaminated Particles | √ | √ | |
Option Sensor Polymer Capacitive Sensor Aluminum Oxide Sensor QCM Sensor |
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| F305x Handheld Dewpoint Meter |
| Product Advantages： Display & Analysis; Ultra-wide Range; Innovative Technology; Handheld |
| Measurement Range： -110 … +60 °Ctd |
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| F191x Dewpoint Meter Integrated with Display and Alarm Function |
| Product Advantages： Ultra-wide measuring range |
| Measurement Range： -110 … +60 °Ctd Optional |
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| F302x Dewpoint & Pressure Multi-parameter Wall-mounted Monitor |
| Product Advantages： Ultra-wide measuring range |
| Measurement Range： -110 … +60 °Ctd Optional |
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| F303x Dewpoint & Pressure Multi-parameter Portable Monitor |
| Product Advantages： Portable Measurement |
| Measurement Range： -110 … +60 °Ctd Optional |
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| F103x FIXINST-P Polymer Capacitor Standard Dewpoint Transmitter |
| Product Advantages： Excellent Pollution Resistance |
| Measurement Range： -60 … +60 °Ctd |
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| F113x FIXINST-P Polymer Capacitor Compact Dewpoint Transmitter |
| Product Advantages： Suitable for compact spaces |
| Measurement Range： -60 … +60 °Ctd |
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| F133x Polymer Capacitor Dewpoint & Pressure Multi-Parameter Transmitter |
| Product Advantages： Integrated pressure measurement |
| Measurement Range： -60 … +60 °Ctd |
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| F161x FIXINST-P Polymer Capacitor OEM Dewpoint Transmitter |
| Product Advantages： High cost performance |
| Measurement Range： -60 … +60 °Ctd |
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| F108x FIXINST-A New-generation Al₂O₃ Standard Dewpoint Transmitter |
| Product Advantages： Fast Response |
| Measurement Range： -110 … +20 °Ctd |
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| F118x FIXINST-A New-generation Al₂O₃ Compact Dewpoint Transmitter |
| Product Advantages： Suitable for compact spaces |
| Measurement Range： -110 … +20 °Ctd |
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| F139C-Puri High Purity Gas Dewpoint Transmitter |
| Product Advantages： Ultra-wide Range |
| Measurement Range： -120 … +20 °Ctd |
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| F139x Al₂O₃ Dewpoint & Pressure Multi-Parameter Transmitter |
| Product Advantages： Integrated pressure measurement |
| Measurement Range： -110 … +20 °Ctd |
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| F138x QCM Dewpoint & Pressure Multi-Parameter Transmitter |
| Product Advantages： Integrated pressure measurement |
| Measurement Range： -120 … 0 °Ctd |
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| F141x FIXINST-Q Dual QCM Standard Dewpoint Transmitter |
| Product Advantages： Ultra-low dewpoint measurement |
| Measurement Range： -120 … 0 °Ctd |
Model | F161x | F113x | F103x | F133x | F118x | F108x | F139x | F141x | F138x | F305x | F191x |
Appearance | |||||||||||
Sensor Type | FIXINST-P | FIXINST-A | FIXINST-Q | Option | Option | ||||||
Optimal Use Range | -60 ... +60 °Ctd | -80 ... -40 °Ctd | -120 ... -60 °Ctd | Option | Option | ||||||
Contains Contaminated | √ | √ | √ | √ | √ | √ | √ | √ | √ | ||
LCD Display | √ | √ | |||||||||
Alarm Function | √ | ||||||||||
Atm. Dewpoint & | √ | √ | √ | √ | √ | ||||||
Portable | √ | ||||||||||
Plot & Data Log | √ | ||||||||||
Bluetooth & WiFi | √ | ||||||||||
Modbus RTU | √ | √ | √ | √ | √ | √ | √ | √ | √ | √ | |
Compact, Aluminum Housing | √ | ||||||||||
Compact, Stainless Steel | √ | √ | |||||||||
Standard, Stainless Steel | √ | √ | √ | √ | √ | √ | |||||
High pressure (> 5 MPa.a) | √ | √ | √ | ||||||||
Due to the natural phenomenon of diffusion (where gases flow towards equilibrium), even pressurized air allows moisture from the environment to penetrate into the compressed air system. Moisture enters through numerous connection points in the system, causing the dewpoint to rise. In applications where a low dewpoint is critical at the usage point, this should be considered, and only measuring the dewpoint at the point of use is reliable