The Analyzer Box (Testo 350) is a rugged plastic housing that contains the: sensors, pumps, gas conditioning system (Peltier chillier and pump), valves, electronics, etc, The Analyzer Box also contains a complete operating system that enables it to be used as a stand alone device that can be programmed to log measurements (250, 000 readings) for automatic semi continuous operation. The Analyzer Box can also be operated remotely (to 3000 ') with a data bus cable, or in a more traditional sense, with the "control unit docked" as a suitcase analyzer.
A clear acrylic container located on the side of the Analyzer Box that serves as a reservoir for condensate. The condensate water can be removed by 1) opening the plug, 2) attaching a hose to the drain port, or 3) by removing the condensate trap. Remove the trap by pulling the trap away from the analyzer and drain by shaking the trap.
The hand-held Control Unit "S" is the interface used to operate the Analyzer Box. The Control Unit houses: system software, a user-defined back lit display, a thermal paper printer and connection ports. Complete analyzer control is through the handheld.
A system that expands the range of the CO sensor by introducing a specific volume of "dilution air" through a precision valve assembly. The dilution system exclusively operates with the CO sensor. Dilution factors (1, 2, 5, 10, 20 or 40) are selected by the user by pushing a function button. The values are automatically calculated based upon the factor. The benefits of the dilution system include:
- Testing high-concentration CO sources without over-ranging and damaging the CO sensor.
- Protecting and extending sensor life.
- Eliminating the need for multiple sensor with multiple ranges therefore minimizing the cost-of-ownership.
An additional "Overall Dilution System" is also available at the touch of a button. It extends the range of all sensors (except O2 and CH) by a factor of 5x.
Excess Air (ExA)
A calculated value that determines the amount of "extra" oxygen in a typical burner / boiler application. The analyzer will display a percentage of oxygen above the "perfect" (or stoichiometric) condition for complete combustion. In general, excess air dilutes and cools the combustion process, it absorbs the energy (heat), and reduces the efficiency of the combustion process.
Fresh Air Purge / Valve
The purge valve (standard part on Testo 350 XL) mechanically opens the fresh-air gas path to remove flue gases from the analyzer. This fresh-air purge is required for electrochemical sensors in order to have accurate response and long sensor life. This valve provides a means to perform long-term testing by maintaining electrolytic equilibrium within the sensor. Fresh air purges nearly eliminate sensor drift and saturation due to long term testing or high concentration loading The valve offers a side benefit that allows the flue gas probe to remain in the stack during analyzer start up or during automatic tests. By pushing the function button, the fresh air valve immediately pulls in air from the side of the analyzer. The days of climbing the stack and fumbling with the probe are gone.
Four round blue buttons located directly below the display of the Control Unit. Each user-defined function key provides a shortcut to important analyzer functions. Some example include: Start sample "Pump", or "Print" emission results, or transfer the measurement values into the memory "mem", etc.
Hydrogen Compensated CO Sensor
A standard electrochemical CO sensor will show a response to Hydrogen. Hydrogen can be in high concentration when excess air is low. Testo sensors use an additional electrode in the sensor to measure the hydrogen and electronically compensate for this cross interfearent. This is a standard item in all Testo 350 CO sensors.
Flow and Mass Flow
The Testo 350 measuring system can determine flow, velocity, and mass flow by a variety of methods. A vane anemometer and hot bulb probe can be connected to the control unit for non-combustion flow measurements. However, typically in combustion sources, the differential pressure sensor and a pitot tube is the standard method. The Pitot tube can be exposed to the harsh environment in a stack. Input variable such as: pitot factor, stack diameter, absolute pressure, humidity and the analyzer will automatically calculate mass flow in lb/hr, ton/year, etc.
Non-Heated Sample Line (Testo Patented) (NO2/SO2-Hose)
Testo's non-heated sample line provides the sampling performance that is equivalent to a reference-level heated sample line. By incorporating: high velocity sample transport through a patented PTFE inner hose, minimized surface area, reduced residence time, and unique self-cleaning abilities, this technology eliminates the cost and bulk of heated sample lines.
A concentration value that is reported in relation to a know reference. Regulatory authorities, engineering studies or other standard reporting may required a gas species (i.e. NOx or CO) to be reported to a specific O2 reference. This provides a method of comparing emission rates on an equivalent basis. For reporting, it eliminates the variability of having extra or deficient oxygen in a combustion system.
Over – Range Protection
The Testo 350 has automatic sensor over-range protection. Whenever this limit is reached a fresh air rinse pump starts and purges the sensors with fresh air. The user can easily define the threshold for each sensor.