![Walsn Portable Acid Dewpoint Temperature Detector [WADT 100-II]](http://hk58cc1e.pic47.websiteonline.cn/upload/vxez.png)
Portable Sulphuric Acid Dewpoint Temperature Monitor
Display
The display has four modes, which are Dials, Trend, Readings and RBU (Rate of build-up).
It is used for measuring the sulphuric acid dewpoint temperature in exhaust air in the process of combustion.The monitor has two main components: the Probe, and the Portable Control Unit (PCU). The Probe is connected to the PCU by an air hose and an electrical cable.
System components
The 100-II is supplied with the following components:
-Probe (with sensor tip and retractable thermocouple)
-Portable Control Unit (PCU)
-Cables:PCU power cable Probe to PCU
-Air hoses:Probe to PCU air hose PCU air supply hose
All cables and hoses are three meters long
Display
The display has four modes, which are Dials, Trend, Readings and RBU (Rate of build-up).
Dials display mode shown
The Dials display shows two large dials. The left hand dial gives the Current reading and the right hand dial gives the Detector Temperature.
Trend Display
When the Trend display is selected, the Dials display is replaced by two trend graphs showing the most recent 30 seconds of current and temperature readings. The other areas of the display remain as before.
Readings Display
In the Readings display, the current and temperatures are shown in text form. If an Acid Dewpoint Temperature (ADT) has been recorded, then this display also shows the ADT, Minimum Metal Temperature (MMT), calculated Sulphuric Acid Concentration, equivalent SO3 concentration at the Flue Gas Temperature measured, and Toxic Release Inventory value per hour and per year. The water content used in the H2SO4 calculation is also shown.
Features
-Portable device
-Robust, wear proof, industrial design
-For daily use in the harshest plant environments
-Measure and calculate sulphuric acid dewpoint temperature, atmosphere temperature, electric current, SO3, H2SO4, MMT
-Easy on-site maintenance
-Effectively control the use of fuel additives such as MgO
-Measure SO3 slip within an ESP to improve ash collection efficiency whilst minimizing acid fog emissions
-Measure and reduce acid smut emissions
Specification
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Sample Probe |
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Material: |
Stainless Steel |
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Detector: |
Pyrex glass with platinum electrodes |
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Flue gas temperature: |
0-400°C |
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Length: |
0.5m standard |
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Weight: |
4.0kg |
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Control unit |
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Design: |
Portable handheld device |
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Electrical part: |
based on industrial PC |
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Measurement parameters: |
Acid Dewpoint temperature, Atmosphere temperature, electric current, SO3, H2SO4, MMT |
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Accuracy: |
±0.2 °C |
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AC power: |
220V a.c. 50Hz |
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Battery charging time: |
4 hours |
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Instrument safety: |
IP65 / NEMA4 |
How WADT 100-II works
With the air valve on the PCU closed, the probe is inserted into the duct or flue, and allowed to warm up. The air valve is then slowly opened to cool the probe tip. Acid condensation is indicated by a rise in electrical current through the sensor.
The rate of deposition of acid on the probe tip increases as its temperature is lowered. If the cooling air flow rate is reduced, the probe tip warms up and acid is evaporated off. At the Sulphuric Acid Dewpoint Temperature, the rate of deposition and the rate of evaporation of the acid are the same, and the film thickness and current reading remain constant. A reading of 50μA on the current meter has been found to correspond to a suitably thin film of acid. The temperature at which this reading remains constant is taken to be the Sulphuric Acid Dewpoint Temperature.
Applications
-Oil/coal burning boilers
-Ore emulsification factories
-Fuel additives / SO3 / MgO delivery system
-Acid plants
-Fertilizer plants