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SGM7

Product catalog summary

Overview
The ZIROX SGM7 is a compact oxygen measuring device utilizing a maintenance-free zirconia technique. It integrates a measuring cell, electronics for heater control, flow monitoring, an integrated pump, and signal processing. The device processes signals via a microprocessor using the NERNST equation, displaying results and generating an analog current signal, with an optional RS232 digital interface.

Applications
The SGM7 is essential in processes involving protective or inert gases where oxygen traces can affect product quality. It supports quality assurance systems like ISO 9000 by enabling continuous monitoring and documentation of quality parameters. Key applications include monitoring in soldering and welding technologies, such as reflow soldering under protective gas.

Technical Specifications

Measurement Range: 2.0 · 10⁵ to 1 vol-ppm, extendable to 10^-20 vol-ppm under reducing conditions, with a requestable range up to 100 vol%.
Accuracy: Relative error < 5%.
Gas Flow: 5 to 10 l/h.
Max Gas Pressure: 20 mbar overpressure.
Max Gas Temperature: 80°C at input.
Pressure Drop: Approx. 1 kPa at 10 l/h.
Dimensions: 135 mm x 100 mm x 240 mm.
Weight: 3 kg.
Protection Degree: IP 40.
Gas Input/Output: Swagelok® 3 mm / Tube nipple 3 mm.
Operating Conditions: 10 to 45°C, relative humidity < 80% at 20°C.
Storage Conditions: -20 to 60°C, relative humidity < 95% at 20°C.

Power Supply

Voltage: 100 – 240 V AC, 47 – 63 Hz.
Power Consumption: 20 VA.
Heater Measuring Cell: 24 V DC, approximately 10 W (internally controlled).

User Interface

Keypad: 3 keys.
Display: LCD dot-matrix.

Interface and Outputs

Interface: RS232.
Analog Output: 0/4…20 mA, isolated, free scalable, max working resistance 500 Ω.
Optional Voltage Output: 0/2…10 V, isolated, free scalable.

Catalog excerpts

ZIROX Oxygen Measuring Device SGM7 Properties The compact oxygen measuring device SGM7 is based on the approved drift-, calibration- and maintenance-free ZIROX zirconia technique. It contains the measuring cell as well the electronics for cell heater control, flow monitoring, integrated pump and signal processing. Via microprocessor the measuring cell signal is processed according to the NERNST equation. The requested value is displayed and generated as an analog current signal. (option: digital interface RS232 with software). Applications In various technological processes under protective or inert gases oxygen traces are detrimental for the product quality. Precondition for detection and prevention of problems is the fast and precise measurement of oxygen or the determination of the reducing force of inert gases. With the increasing introduction of quality assurance systems, e.g. ISO 9000, a constant monitoring and documentation of quality parameters becomes more important. With the SGM7 the user gets several possibilities for that. The SGM7 serves the continuous measurements of free oxygen in industry and laboratory gases, for the monitoring of protective gases and for the determination of bound oxygen in gas mixtures. The main applications of the SGM7 are monitoring functions in the soldering and welding technology (e.g. reflow soldering under protective gas).

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