ENOTEC OXITEC 5000 SME-53310000 Flue Gas Oxygen Analyzer System
Product Overview
The ENOTEC OXITEC 5000 SME-53310000 is an InSitu flue gas oxygen analyzer system designed for combustion plants and comparable inert gas processes. It combines a robust measuring probe with the SME-53 electronic unit to deliver continuous oxygen measurement directly in the duct. The system is built for industrial environments where reliable oxygen data supports combustion efficiency, emissions control, and process safety. The OXITEC 5000 platform includes the OXITEC 5000 and OXITEC 5000 plus configurations. The SME-53310000 system reference identifies a configured analyzer package with the SME-53 electronic unit and a compatible KES probe. The analyzer is intended for non-combustible process gases and flue gases, and it provides stable measurement with low maintenance when installed and operated correctly.
Measurement Principle
The measuring probe uses a zirconium oxide sensor located at the probe tip. The sensor is regulated to approximately 800 degrees C. Reference air with a known oxygen concentration of 20.95 percent is supplied to the inside of the sensor. The process gas surrounds the outside of the sensor. A millivolt signal is generated between the reference side and the measured gas side. This signal depends logarithmically on the ratio of oxygen partial pressures across the sensor. The electronic unit converts the millivolt signal according to the Nernst equation into oxygen partial pressure and then into oxygen concentration. Gas-tight separation of reference air and process gas is essential for accurate measurement. If combustible components such as CO or H2 are present, they can react at the sensor surface and reduce the measured value.
Electronic Unit SME-53
The SME-53 electronic unit provides voltage supply, gas supply control, signal processing, display, and system diagnostics. It is housed in a powder-coated sheet steel enclosure with IP66 protection for safe area installation. The front panel includes a backlit LCD dot matrix display with 240 by 64 resolution, a membrane keypad, and three status LEDs. The LEDs indicate alarm, maintenance, and error conditions. The display and keypad allow users to view measured values, configure measuring ranges, start calibration, review system checks, and access service menus. The electronic unit supports two freely configurable oxygen measuring ranges from 0 to 2 percent O2 up to 0 to 25 percent O2. Other ranges are available on request. The unit also manages automatic calibration, limit alarms, mA output settings, and optional remote access functions.
Probe Configuration and Temperature Range
The system supports several probe families to match different flue gas temperatures and installation depths. The KES-132X probe is suitable for process gas temperatures up to 400 degrees C. The KES-200X probe supports up to 600 degrees C. The KES-500X probe also supports up to 600 degrees C and can be combined with a cooling protection tube for higher temperature applications up to 1600 degrees C. Insertion depths vary by probe type and can be selected for small ducts or large industrial stacks. The probe housing provides IP65 protection. The connection box includes terminals for the oxygen sensor, thermocouple, heater, and optional solenoid valve. The probe cable can be up to 150 meters long. The shield must be connected only at the electronic housing at the PE terminal and must not be connected at the probe.
Measurement Performance
The analyzer provides accurate oxygen measurement with an accuracy of less than 0.5 percent of the measured value or 0.02 volume percent O2, whichever is greater. The reaction time of the mA output to a change in the oxygen sensor input voltage is less than 200 milliseconds. With test gas, the reaction time is less than 1 second, and the T90 time is less than 5 seconds. The measuring principle is linearized and converted to an active current output. The oxygen measuring range start value produces an output of 4.00 mA, and the end value produces 20.00 mA. If the measured value falls below the start value, the output drops to 3.60 mA. If it rises above the end value, the output rises to 20 to 40 mA. These behaviors help the control system identify under-range and over-range conditions.
Outputs and Control Interfaces
The electronic unit provides an active 0/4 to 20 mA output for oxygen concentration. The output is galvanically isolated and can drive a maximum load of 500 ohm. Relay contacts are available for status signals. These include system error, maintenance, measuring range, probe valve, and two limit alarms. The relay contacts are rated for 24 V AC or DC at 1 A. The probe valve relay is rated for up to 230 V AC or DC at 1 A. Digital inputs accept 12 to 24 V DC for calibration release and measuring range switching. Optional extension modules can provide RS232, RS485, HART, or Fieldbus interfaces. The ENOTEC REMOTE option allows secure wireless access for configuration and data review from a smartphone, tablet, or computer. The remote function is disabled by default and can be activated with an eight-digit password.
Calibration and Gas Supply
The system supports manual calibration and automatic calibration. A one-point calibration determines the sensor offset using test air. A two-point calibration determines both offset and slope using test air and test gas. Test air is known to contain 20.95 percent O2. A typical test gas may contain 2.1 percent O2 in nitrogen. The automatic calibration function can be started by time, by time plus digital input, or by digital input. For systems with integrated pneumatics, reference air and test air flow rates can be adjusted. The recommended test air flow is 150 to 180 liters per hour. The recommended reference air flow is 30 to 40 liters per hour. Instrument air should meet ISO 8573-1 class 2, with an input pressure of 2 to 10 bar. Test gas pressure should not exceed 3 bar. The system monitors stability during calibration and can display an error if the sensor signal is unstable.
Installation Guidelines
The electronic unit should be installed at eye level with minimum distances to adjacent objects. It should be protected from vibrations greater than 2g and from ambient temperatures outside the specified range. The standard safe area housing operates from minus 20 to plus 55 degrees C. The probe should be installed so that the V-shield faces the oncoming flue gas. A horizontal installation with a slight downward angle of 1 to 3 degrees is recommended for fast response. For probe lengths over 2000 mm, internal supports should be mounted every 2 meters. The counter flange must be welded gas tight at the correct angle. Flange gaskets and proper bolt torque help prevent leakage. If a cooling protection tube is used, the section outside the duct wall should be insulated or heated to avoid dew point condensation. The gas outlet must not be blocked.
Maintenance and Service Life
The analyzer is designed for continuous operation. Keeping the probe heated during process operation helps avoid deposits and extends service life. Frequent cooling and heating cycles create thermal stress on the heater, thermocouple, and sensor. Maintenance intervals depend on flue gas conditions. Corrosive components such as SO2 or HCl, reducing atmospheres, and solid particles can affect the probe and sensor. A sensor check with test gas and test air is recommended every six months. A visual inspection is recommended at least annually, including cleaning of the filter element if necessary. Replaceable filters include ceramic, basalt, and sintered metal types. The oxygen sensor should be replaced only if it is leaking or providing erratic values. After sensor replacement, a two-point calibration should be carried out after 24 hours of operation.
Safety and Process Protection
The system operates with line voltage. Only trained and authorized personnel should perform installation, operation, and maintenance. The electronic unit does not include an external power-off switch, so a suitable line voltage switch, fuse, or breaker must be installed nearby and clearly marked. The probe and filter head can reach temperatures from 150 to 800 degrees C during operation. Heat-insulated gloves are required when removing the probe. The supply voltage must be switched off before removal, and the probe must cool below 35 degrees C before storage or handling. The analyzer must not be used in the vicinity of combustible gases or to measure combustible gas mixtures. The probe must never be connected directly to a 230 V AC main supply. Individual field power monitoring is not supported on some termination options and must be turned off in the configuration software.
Applications and Benefits
The ENOTEC OXITEC 5000 SME-53310000 is suitable for combustion optimization, emissions monitoring, process control, and safety applications in boilers, furnaces, kilns, incinerators, and other industrial combustion systems. Its InSitu design avoids long sample lines and provides fast response to process changes. The zirconium oxide sensor with a gas-tight seal offers long service life compared with cemented or glued sensors. The SME-53 electronic unit provides clear diagnostics, limit alarms, automatic calibration, and flexible output options. The system can help reduce maintenance costs, lower fuel consumption, and improve measuring accuracy. With high-temperature probe options, cooling protection tubes, and multiple termination choices, the analyzer can be adapted to many flue gas and process gas conditions while maintaining reliable oxygen measurement.
Summary
The ENOTEC OXITEC 5000 SME-53310000 flue gas oxygen analyzer system combines the SME-53 electronic unit with a zirconium oxide InSitu probe for continuous oxygen measurement. It supports configurable O2 ranges, active current output, relay contacts, digital inputs, automatic calibration, and optional communication interfaces. The system is built for industrial combustion and process applications where accuracy, reliability, and low maintenance are important. Proper installation, continuous operation, and scheduled calibration help ensure stable performance over many years. The analyzer is a practical solution for operators who need dependable oxygen data for combustion control, efficiency improvement, and emissions management.
