Hitech Instruments - GIR250 Gas Analyser

This listing is for the Hitech Instruments GIR250 Gas Analyser

The unit is in full working condition and is ready for immediate use

The GIR250 is a bench‑top / transportable analyser designed to measure oxygen (O₂) and carbon dioxide (CO₂) simultaneously in gas samples.

It is made by Hitech Instruments (now part of the MTL / Eaton group).

Its design emphasizes ease of use, reliability, and low maintenance cost.

Other supporting features:

The instrument can be programmed with pass/fail criteria for each gas (alarms).

It provides analog outputs, typically 4–20 mA, for external logging or control systems.

Calibration is designed to be simple (via the front panel keypad) to reduce training burden.

The O₂ galvanic cell is user-replaceable (i.e. maintenance can be performed in the field).

Mechanical, Electrical & Operational Details

The GIR250 is housed in a rugged, transportable case (lab-style) so it can be used as a benchtop or mobile analyser.

Sample inlet and outlet connections use 0.25″ (~6 mm) tubing.

The sample system should avoid condensation and contaminants; non‑condensing sample environment is required.

Operating ambient temperature: –5 to +40 °C (for non‑condensing conditions)

Power / interface: standard for bench‑top analysers (the catalogue doesn’t always detail it, but likely mains or DC supply, suitable for lab use)

Typical Applications & Suitability

Because it can measure both O₂ and CO₂ in a single unit, the GIR250 is used in applications such as:

Respiration / breathing gas analysis / Douglas bag analysis (i.e. in physiological or experimental gas mixture measurement)

Fermentation / bioprocess monitoring (where O₂ and CO₂ both matter)

Gas mixture / inertisation / process gas quality (checking gas purity, calibrating mixtures)

It is not primarily intended for measuring very low trace levels (ppm-level) of O₂ or CO₂ unless its ranges are suitably adapted or specified. The design is more for percent-range analysis