There are two continuously running pumps inside the pump casing, which transport measuring gas and zero gas respectively. According to the selected operating mode (measurement/blowing), the measurement gas and zero gas transfer are respectively executed by one pump. Gas connection is achieved through corresponding valves.

The measurement principle of gas components is based on the specific infrared light absorption characteristics of different substances. Infrared light directly passes through the measuring gas, and as the substance absorbs a specific wavelength, the light intensity decreases, reflecting changes in concentration.

The testo 370 uses three different measurement methods for calculating gas concentration:

Technical Specifications
chassis	Portable dual chassis design,
	475 mm x 245 mm x 245 mm (宽x 高x 深);
	Weight: Optical measuring instrument box 19.5 kg, pump box 9.5 kg
	(Depending on different configurations), IP 30
Measuring principle	-Dual wavelength measurement principle (NO2, SO2, H2O, CO2)
	-Gas related filtration principles (CO, NO, HCl, NH3, N2O, CH4)
	-Zirconia principle (O2)
Measure the quantity of components	Measure up to 11 infrared components (depending on different applications)
ambient temperature	-Operating temperature: 0... 40 ° C (maximum temperature stability of 5 K/h)
relative humidity	Maximum 90% (non condensing)
precision	<2% of the range
Zero point correction	automatic
span	Use standard gas once every June
Cross interference calibration	Add, multiply
Air pressure correction	yes
calibration	Automatic zero calibration through ambient air
standardization	Dry value output, wet value output
Gas delivery	Wind box air pump (independent pump box)
Compressed gas connection	No instrument gas required
medium temperature	Up to 200 ° C
Optical measuring instrument	-Spectral range: 1... 16 μ m
	-Gas path: Continuous heating, standard value of 200 ° C (higher temperature can be customized according to demand)
	-The optical path length of the measuring pool is adjustable from 2 to 10 meters
	-Fixed capacity of measuring pool:<1 L
	-Particle filtration diameter: 2 μ m
Display/Operation	Operating software connected via USB
data storage	Stored on a tablet or laptop
power supply	230 V AC, 50/60 Hz (per chassis)

Range
component	range1	range2	range3
CO	0...75 mg/m³	0…300mg/m3	0...5000 mg/m³
CO2	0...25 vol. %		0...50 vol. %
NO	0...100 mg/m³	0...400 mg/m³	0...3000 mg/m³
NO2	0...50 mg/m³	0…500mg/m3
N2O	0...50 mg/m³	0...3000 mg/m³
NH3	0...10 mg/m³	0…50mg/m3	0…500 mg/m³
SO2	0...50 mg/m³	0...300 mg/m³	0...2500 mg/m³
HCl	0...15 mg/m³	0...90 mg/m³	0...5000 mg/m³
H2O		0...40 vol. %
CH4	0...50 mg/m³	0...500 mg/m³
O2	0...25 vol. %

Q1. What is the working principle of testo 370?
A1. There are three working principles involved in the equipment:
-Gas related filtration principle, accurately measuring interfering gases;
-Dual wavelength principle;
-Oxygen is based on the principle of zirconia

Q2. What are the advantages of high-temperature infrared?
A2. The advantages of high-temperature infrared mainly focus on two points:
-No changes were made to the atmosphere, consistent with the flue, more precise;
-Low temperature infrared pretreatment will result in a loss of 5-10 mg/m3 of SO2; High temperature infrared does not have such problems, so its accuracy is better.

Q3. What benefits can testo 370 bring to users?
A3. Able to measure more components; The atmosphere remains unchanged, with no pre-processing losses, making it more precise.

Q4. What are the advantages of testo 370 compared to Fourier transform infrared?
A4. In summary:
-Cheaper in terms of price;
-Structurally simpler than GASMET; It is also more sturdy and has lower maintenance costs in the later stage;
-Lower weight, more portable

Q5. What are the advantages of testo 370 compared to low-temperature infrared?
A5. The price of low-temperature infrared is cheap, but it cannot be compared to the testo 370, as the two are not in the same level. Germany has conducted a comparative test before, and testo 370 won completely.
-Low temperature infrared pretreatment will result in a loss of 5-10 mg/m3 of SO2; The testo 370 does not have such a problem, so the accuracy is better!
-The testo 370 has been tested for both NO and NO2, and each instrument is customized for production with a longer calibration cycle.
-The testo 370 can measure more parameters, such as NH3 and HCL, while low-temperature infrared can measure fewer parameters.
-The optical path length of testo 370 is up to 7m, while the optical path length of low-temperature infrared devices on the market is usually only 1m, so the accuracy is not at the same level.

Q6. How long can the measurement duration reach? Can continuous measurements be conducted?
A6. The original design of the device was based on online continuous measurement. Maintaining once every 3-5 months is sufficient, and it can last up to a year without any problems. It is helpful for process control and can support long-term operation.

Q7. What is the working principle of the device for measuring NH3?
A7. High temperature infrared gas related filtration principle.

Q10. Does the device have measurement functions for flow rate and smoke temperature?
A10. The measurement itself does not require pressure and temperature compensation; In addition, the measurement results have already been converted to the concentration under standard conditions; The device itself cannot measure flow rate and smoke temperature, so it cannot convert the total emissions.

Q1. Which components of the high-temperature flue gas analyzer have cross interference/absorption interference?
A11. Please refer to the compensation table (horizontal interference to vertical interference) for details; The specific interference levels can be found in the table. It should be noted that due to the optical components, the interference of each device varies.

Will the accuracy of the equipment decrease after 3.3 months?
A12. To ensure accuracy, it is necessary to ensure annual calibration and maintenance.

Is the software included with the device free of charge?
A13. Yes, it's free!

Q14. Can each device only be connected to one computer?
A14. Yes, it can only be connected to one computer for measurement at a time, and both directions are only one-to-one. But this combination is not fixed.

Q15. Is the device equipped with WiFi/Bluetooth functionality?
A15. No.

Q16. How to calibrate?
A16. Please contact our after-sales personnel for calibration!

What is the calibration frequency for Q17.H2O?
A17.一年一次。

Q18. What is the cost of using and maintaining testo 370?
A18. Possible vulnerable parts involved are:
-If the bellows pump is calculated based on a working time of 100 hours per month, its service life is about 3.5 years;
-The internal filter also needs to be replaced every two years under normal working conditions;
-The sealing ring needs to be replaced after one to two years. To ensure sealing, the sealing ring must be replaced every time it is opened.

Annual range calibration/linearity check:
-Range calibration can be performed directly if available at the customer's location.
-If it is linear, it needs to be taken back to the manufacturer for processing, which is not included in the after-sales service and requires additional payment