Gastec KS Oxygen Sensor

Description

The KS sensor operates on the galvanic cell principle, where oxygen is reduced at a sensing cathode while a lead or specialized alloy anode is oxidized. This reaction generates an electrical voltage directly proportional to the partial pressure of oxygen in the sampled air.

A standout feature of the KS series (specifically the KS-25 variant) is its high resistance to interference from acidic gases like Carbon Dioxide ( $CO_2$ ), which often “poison” or prematurely exhaust standard oxygen sensors. This makes it a preferred choice for monitoring combustion exhaust or brewery environments.

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: Requires no external power to operate the sensing element itself and needs no warm-up time.
$CO_2$ Resistance: Specially designed to maintain accuracy even in the presence of high concentrations of Carbon Dioxide.
Linear Output: Provides a highly predictable signal across the 0–25% (standard) or 0–50% (extended) range.
Long Life Expectancy: Features a robust internal chemical capacity, typically offering a service life of 2 to 3 years in ambient air.
Excellent Durability: Built to withstand fluctuations in atmospheric pressure and humidity without significant signal drift.

Specifications

Feature	Specification
Model Number	KS-25 / KS series
Detection Principle	Galvanic Cell
Compatible Devices	KS-7O, GOA-7H, GOC-200
Measurement Range	0.0 – 25.0% (Enhanced up to 50.0%)
Response Time ( $T_{90}$ )	$leq$ 15 seconds
Operating Temp	-10°C to 40°C
Weight	Approx. 20g – 25g (Sensor only)

Applications

Fixed or Portable Integration: The KS sensor is applied by mounting it into the sensor manifold of a compatible Gastec or New Cosmos gas detector.

Installation: For fixed units like the KS-7O, the sensor is secured into a threaded or friction-fit chamber and connected to the PCB via a dedicated wiring harness or pin-set.
One-Touch Calibration: Because galvanic cells produce a signal immediately, application typically involves a “One-Touch” air calibration. In a fresh air environment ( $20.9% text{ } O_2$ ), the monitor is adjusted to match the known atmospheric oxygen level.
Maintenance Monitoring: Applied for 24/7 safety; however, the sensor should be checked monthly. If the monitor cannot be calibrated to $20.9%$ or if the “Low Oxygen” alarm triggers in fresh air, the sensor has reached its end-of-life and must be replaced.