A furnace for heating slabs needs to be operated under low oxygen conditions at high temperatures of 1000℃ and above to prevent oxidation of the steel. The measurement of oxygen concentrations in the furnace is essential in this process.
The ZR22G/ZR802G Zirconia Oxygen Analyzer requires no sampling system and utilizes a long-life sensor, and is therefore ideally suited for measurement of oxygen concentrations in a hightemperature environment. The ZR22G detector with the ZO21P high temperature probe adapter can be used in gas furnaces at temperatures up to 1400℃.
- Maintains high product quality by monitoring oxygen concentrations in steel mill reheating furnaces
- Ensures stable, continuous measurement of oxygen concentrations
- Reduces operating costs
Slabs are loaded on a conveyor and fed to a reheating furnace, which is heated to between 900 and 1400℃ by burners that use fuels such as by-product gas. In order to keep the oxygen concentration between 1 and 2%, it is monitored in the preheat, heat , and soak zones. The slabs are heated uniformly without being oxidized, and then sent to the next processing stage.
|Measurement point:||furnace reheat, heat, and soak zones|
|Temperature:||900°C to 1400°C|
|Pressure:||30 to 50 kPa|
|High temperature probe adapter:||ZO21P-H-☐-☐☐☐-☐*B|
|Auxiliary ejector for high temperature use:||E7046E☐|
|Flow setting unit:||ZA8F-☐*C|
|Calibration gas unit|
|Pressure regulator for gas cylinder:||G7013XF (inlet W22, outlet Rc1/4) or G7014XF (inlet W22, outlet 1/4NPT)|
|Case assembly for calibration gas cylinder:||E7044KF|
Note: the calibration gas cylinder must be purchased locally.
|Power supply:||85 to 264 V AC, 50/60 Hz|
|Instrument air (reference gas):||pressure, 300 to 700 kPa|
The material selected for the high temperature probe adapter depends on the temperature of the sample gas. Follow instructions carefully when installing the probe.
|SUS:||Sample gas temperature ≤ 750°C|
|Probe orientation:||vertical or horizontal|
|Inconel:||750°C < sample gas temperature ≤ 900°C |
Probe orientation: vertical or horizontal
|SiC:||900°C < sample gas temperature ≤ 1400°C |
Probe orientation: vertical
When the probe is installed horizontally, bracings must be provided for mechanical support
This Oxygen concentration and humidity at high temperatures consists of a ZR22G detector equipped with a long-life and highly reliable zirconia sensor, and a converter ZR802G equipped with digital communication and data log functions.
ZR22G and ZR802G can be measured directly and continuously without a sampling device. It is easy to maintain and reduce operating costs by self-diagnosis of sensor deterioration (without using calibration gas )and replacing the heater assembly on site.