Dew Point Meter

A dew point measuring instrument, or a dew point meter is a device used to accurately determine the dew point temperature (°C Td) of compressed air or gas. A dew point analyzer accurately measures the dew point temperature at which the water vapor present in the compressed air or gas condenses into liquid. A dew point measurement device takes a sample of compressed air or gas and determines its dew point. A dew point transmitter, on the other hand, is directly placed in the pipeline of compressed air chambers for continuous monitoring of dew point temperature. Apart from measuring the dew point temperature (°C Td) of gas, a dew point meter can also determine the temperature (°C), moisture (PPM) level of the gas, and relative humidity (%RH) of the compressed air.

What Makes Vasthi Dew Point Meters better?

Maintaining an appropriate moisture(PPM) level and dew point temperature in the compressed air or gas system is critically important to the end result of the process. From petrochemicals to natural gas, pharmaceuticals to aerospace, an expansive range of applications require professional and accurate dew point measurement tools for best operation. Dew point meters and transmitters from Vasthi instruments are trusted by professionals around the world for their faultless measurement capabilities. Offering a wide variety of dew point measurement tools like an online dew point meter, portable dew point meter, and dew point transmitter with an extensive range of options, Vasthi Instruments is an ideal choice for every industrial dew point measurement prerequisite. 

With an easy-to-use interface and robust design, our trace moisture dew point meters with a measuring range of (-60°C to +30°C),( -40°C to +30°C) & (- 80°C to +30°C) are incredibly reliable and are suitable for accurate and faultless dew point monitoring. Our engineers at Vasthi Instruments have designed quintessential dew point meters that flawlessly measure relative humidity and dew point temperatures with +/- 1% accuracy. Our dew point measuring instruments comply with parameters set by International Organization for Standardization (ISO).

Dew point meters from Vasthi Instruments are suitable for the following gas types:

 

✓ Air / Compressed air

✓ Carbon dioxide (CO2)

✓ Methane (CH4)

✓ Nitrogen (N2)

✓ Oxygen (O2)

✓ Natural gas

✓ Argon (Ar)

✓ Hydrogen (H2)

✓ Other gases on demand

 

What is the dew point temperature?

The dew point is the temperature at which the air needs to be cooled  (at constant pressure) to achieve 100% relative humidity (RH). At this point, air can no longer hold water in the form of a gas. In simpler terms, dew point temperature(measured in °C Td) is the temperature at which compressed air gets completely saturated.

Difference between dew point temperature and relative humidity

Dew point temperature indicates the absolute amount of moisture in the air, and thus how much humidity it feels on the outside body. Relative humidity, on the other hand, only indicates how saturated the air is compared to the amount it can hold.

Relation between pressure and dew point.

When air pressure decreases, the temperature of the air decreases too. This is because molecules in the air are closer together when the pressure is lower, so they can transfer heat more easily. This is why cold air is denser than warm air, and pressure decreases the water's temperature.

What is the pressure dew point?

The dew point temperature of air or gasses at a pressure higher than atmospheric pressure can be named as pressure dew point( PDP). The pressure dew point depends on the final compression pressure in the chamber. If the pressure declines, the pressure dew point drops. Pressure dew point is significant for compressed air alone.

The pressure dew point of compressed air:

The pressure dew point (PDP) of compressed air varies with the compressor systems that are being used. The typical pressure dew point of compressed air ranges between 50°F (10°C) to 94°F (35°C).

How are dew point and humidity related?

Both measure moisture in the air, but the dew point measurement determines the amount of water in the air, and the relative humidity(%RH)  indicates how close the air is to saturation. So, if the relative humidity is at 100%, the water vapor is going to condense.

The higher the dew point temperature, the more water vapor is contained in the air. The lower the difference between the temperature and the dew point temperature, the higher the relative humidity(% RH).

How do you determine the dew point in compressed air?

Right off the bat, using gas measurement devices is a great way to determine the dew point temperature (°C Td) of any compressed air or gas. A dew point measuring instrument from Vasthi Engineers can accurately determine the temperature (°C) of the air and the moisture (PPM) level in the air. A Dew point analyzer is a great tool to determine the relative humidity (%RH) of compressed air or gas. 

These dew point measuring instruments, or dew point meters are equipped with accurate pressure sensors to determine the temperatures of compressed air or gas with a wide measuring range. 

Why is measuring the dew point temperature essential?

Measuring the dew point temperatures of compressed air or gas plays a vital role in a majority of industrial processes. Temperatures inside pressurized air or gas chambers can rise up to 148°C (300°F). If proper cooling/air drying steps are not taken, excess water vapor in the air when compressed, condensates into dew drops and settles on the equipment inside the pressurized chambers. The dew drops inside a compressed environment can cause a myriad of complications to the equipment and the production process.

Maintaining a predisposed temperature in pressurized chambers is highly important to achieve the best output. Dew point measurement tools play a vital role in the safe operation of devices and systems. Failing to maintain an optimal dew point temperature results in malfunction of control instruments, inconsistent operation of air valves and cylinders in the systems, and often increases wear and maintenance of pneumatic devices.

A dewpoint measurement device is significant in HVAC ( Heating, Venting, and Air Conditioning) in industrial processes. Many industrial applications like the production of paints, food processing, and pharmaceuticals utilize dry air to keep their products safe from contamination. For applications like these, maintaining an ideal dew point using a dew point analyzer is highly essential for the quality of the end product. 

From petrochemicals to natural gas, pharmaceuticals to aerospace, an expansive range of applications requires professional and accurate dew point measuring instruments for best operation.

What is a dew point meter?

A dew point measuring instrument, or a dew point meter is a device used to accurately determine the dew point temperature (°C Td) of compressed air or gas. A dew point analyzer accurately measures the dew point temperature at which the water vapor present in the compressed air or gas condenses into liquid. A dew point measurement device takes a sample of compressed air or gas and determines its dew point. A dew point transmitter, on the other hand, is directly placed in the pipeline of compressed air chambers for continuous monitoring of dew point temperature. Apart from measuring the dew point temperature (°C Td) of gas, a dew point meter can also determine the temperature (°C), moisture (PPM) level of the gas, and relative humidity (%RH) of the compressed air.

How does a dew point meter work?

The operation principle of a dew point measuring instrument is based on the basic definition of dew point. It cools a sampled amount of air until a condensate is formed. The gas sample passes through a metallic mirror surface chilled by a cooler. Light is directed towards the mirror, and an optical sensor measures the reflected light. The mirror is then gradually cooled, using an efficient temperature sensor to adjust the temperature, until the water vapor in the air condenses and dew drops start to form on the mirror. This reduces the amount of light reflected by the mirror. The optical sensor notices the change in the reflected light. Now, the temperature at which the first dew drops formed on the chilled mirror is displayed as the dew point temperature of the gas or air.

Choosing the right dew point meter 

There are mainly three types of dew point measuring tools that are widely used across industries. 

1. Online dew point meter

2. Portable dew point meter

3. Dew point transmitter

Depending on the type of industrial application and user requirements, choosing an accurate dew point measuring instrument is highly important to ensure the best result.

Choosing a dew point analyzer that is suitable for your industrial requirements helps in maintaining the safety of the pneumatic devices and keeping up the outstanding quality of the end product.

Vasthi Instruments’ dew point measuring devices are widely regarded as the best in the business for their flawless accuracy and bespoke range of dew point measurements.

Special features of our Dew point measuring instruments:

  • Measurement of very low dew points down to (-100°C)
  • Ensures long-term stability as a result of Internal automatic calibration technology.
  • IP 65 housing that grants reliable protection in extreme industrial conditions
  • Super fast response times.
  • Installation in the dryer by means of G 1/4" thread or measurements as per user requirement.
  • High accuracy of ± 1°C
  • On-site calibration and testing with Vasthi control and calibration set.

Sampling System:

A wide range of bespoke and standard sampling conditioning systems are available, depending on the process conditions. Filters, pumps, and regulators can be incorporated to deliver the sample in an accurate condition. Bypass flow systems enable longer distances from the process to the analyzer to be achieved. Our engineers at Vasthi Instruments are always ready to recommend the right system for you on receipt of the full gas stream specification.

Vasthi Instruments’ product catalog includes dew point measuring instruments like online dew point meters, portable dew point meters, and dew point transmitters with standard measuring options and options specialized for bespoke measurement range catering to every industrial requirement. We at Vasthi Instruments take pride in providing impeccable services and safety measurement tools for our vast customer base at domestic and international industrial operations.



 

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Contacts:

Ph. +91 7337418685
Mail. info@vasthi.com
Office. HYDERABAD

Manjeera Trinity Corporate,
Plot No-112, Survey No:1050,
JNTU, Hitech city Rd, KPHB Colony
Kukatpally, Hyderabad-500072


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