Gastec O2-207G Oxygen Sensor

Description

The O2-207G operates on the galvanic cell principle, functioning as a self-powered electrochemical battery. Oxygen from the sample diffuses through a high-durability membrane and is reduced at the cathode, generating a voltage that corresponds to the oxygen concentration (0.0–25.0%).

This sensor is notable for its $\phi$ 24.5 x 55 mm dimensions, which accommodate a larger internal electrolyte reservoir than typical “plug-in” portable sensors. This design ensures that the sensor maintains its calibration even when subjected to the physical movement and pressure changes often encountered during remote sampling with long extension cables.

Brand

Gastec

Although, technology is always evolving, one demand on our products never changes: the demand for customer safety. Whenever we contribute to customer safety, we are presented with an opportunity to develop further.

GASTEC holds this corporate creed of safety and development in high esteem, as it strives to grow while always putting customer safety first.

Features

Galvanic Cell Technology: Provides a self-generating electrical signal; it is active the moment it is exposed to oxygen and requires no warm-up.
Optimized for Remote Sampling: Specifically designed to maintain signal integrity when connected to the GOA-40D-5 via extension cables (up to 30m) or poles.
High Analytical Accuracy: Offers an accuracy of ±0.5% $O_2$ within the standard measurement range, fulfilling strict industrial safety standards.
Rugged Housing: The larger 45g mass provides better thermal and chemical stability, extending the sensor’s functional life in harsh field environments.
Wide Measurement Range: While optimized for 0–25.0%, it is capable of measuring up to 42.0% $O_2$ for specialized applications.

Specifications

Feature	Specification
Model Number	O2-207G
Detection Principle	Galvanic Cell
Compatible Device	GOA-40D-5
Dimensions	$phi$ 24.5 x 55 mm
Weight	45g
Target Gas	Oxygen ( $O_2$ )
Operating Temp	-10°C to 40°C

Applications

Remote Cable or Direct Mounting: The O2-207G is applied by connecting it to the sensor lead of the GOA-40D-5 detector.

Installation: Screw the sensor into the threaded holder at the end of the extension cable or the detector’s sensor port. Ensure the multi-pin connector is fully seated and the lock-nut is tightened.
Fresh Air Calibration: In an environment known to have normal oxygen levels ( $20.9% text{ } O_2$ ), use the “One-Touch” calibration button on the GOA-40D-5. The digital display will automatically adjust to 21.0%.
Sampling: Lower the sensor into the target area (e.g., a manhole) using the extension cable. The backlit LCD on the monitor will show real-time changes in oxygen levels.
Maintenance: If the monitor triggers a “Sensor Error” or cannot be calibrated to 21% in fresh air, the chemical capacity of the O2-207G is exhausted and it must be replaced.