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How to Validate Moisture Analyzers with Insight Analytical's Moisture Generator Block

by Insight Analytical

Moisture measurement is a critical task in many industrial and laboratory settings. A precise way to calibrate and validate moisture analyzers is through the use of known moisture generation sources. Insight Analytical's moisture generator block is a versatile tool designed to validate moisture analyzers, compact, and portable, while having quick response times, enabling the generation of known concentrations of water vapor in carrier gases. Let's delve into the intricate workings of this system and understand how it can be an asset in your moisture analysis regime.

What Is the Moisture Generator Block?

The moisture generator block is a robust piece of equipment used to provide a source for online or in-lab moisture analyzer validation.

It allows for the generation of a known concentration of water vapor in a carrier gas. Carrier gas can be anything from nitrogen from a cylinder to natural gas directly from your pipeline.

The Setup and Functionality

Bringing in the Carrier Gas

A high-pressure carrier gas is introduced into the system. Inside the block, the flow is split into two paths:

  1. One part goes through a desiccant dryer to ensure the removal of moisture.
  2. The other part goes internally where it encounters a moisture saturator.

The unique feature here is a fixed dilution ratio between the two sides, ensuring precision in concentration generation.

Dry Run and Baseline Measurement

Initial measurements are carried out with only the dryer active to establish a reliable zero point. Using a moisture analyzer like the Tiger Optics cavity ring-down spectrometer, the dry gas can be seen to contain about 81 parts per billion (ppb) of moisture.

Generating Moisture-Saturated Gas

By altering a valve, the moisture generation side is engaged, allowing the carrier gas to flow through the moisture generator and mix with the dry gas. The internal mechanics, including the fixed dilution ratio, are calibrated for each generator block and are provided along with a spreadsheet designed for accurate water content calculations.

Measuring and Comparing Concentrations

The process involves observing the moisture analyzer's display and comparing the measured concentration to predicted values derived from the spreadsheet and the saturation temperature of the gas.

For example:

At 200 psi gauge and 22.25 degrees Celsius, a prediction could be around 159 ppb. The actual analyzer reading following equilibration may be close to 161 ppb.

Calibration and Validation Points

Gas Pressure Adjustments

Adjusting the inlet pressure regulator can change the pressure at which the gas is saturated, and subsequently alter the dilution ratio and the concentration of moisture in the gas. Multiple points of calibration can be performed by switching the pressure to different settings, such as 200 psi to 400 psi.

Observing the real-time changes in moisture concentration allows an operator to monitor the equilibration process and stabilization of readings, which can be crucial for ensuring the accuracy of the calibration.

Additional Features

The moisture generator block has several advantages over other calibration methods:

  • Portability - It can be used in the field without any special considerations.
  • Speed - Equilibration occurs rapidly, allowing quick validation.
  • Flexibility - Any carrier gas can be used, matching process conditions.
  • Multipoint - Various pressures enable multiple calibration points.
  • Repeatability - Concentrations can be repeated precisely.

With its robust design and intuitive operation, the moisture generator block simplifies the validation of moisture analyzers. The ability to quickly confirm linearity and repeatability gives analysts confidence in their moisture measurement data.

Additional Resources:

  1. Moisture Generator Blocks Information: For more details about our Moisture Generator Blocks, visit our product page here.
  2. Video Demonstration: Check out our comprehensive video demonstration showcasing the Moisture Generator Block on YouTube.
  3. Connect with Phil Harris on LinkedIn: Connect with Phil Harris, one of our experts, on LinkedIn here.
  4. Insight Analytical LinkedIn Page: Stay updated with Insight Analytical Solutions by following our LinkedIn page her
  5. Insight Analytical on YouTube: Explore more videos and insights on our YouTube channel.

Feel free to click on the links above to delve deeper into the topics that interest you. We appreciate your interest in our products and expertise! If you have any further questions, don't hesitate to reach out.

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