GSTB-400H V1.2Limiting Current Oxygen Sensor

The GSTB-400H is a zirconia limiting-current oxygen sensor module developed by Winpower Technology Co., Ltd. It is based on the solid-electrolyte oxygen-pump principle: the element has a built-in diffusion barrier and is maintained at high temperature by an internal heater. Under an applied voltage, oxygen diffuses through the barrier into the sensing cavity; when the pump rate exceeds the oxygen diffusion supply rate, the circuit current saturates to form the limiting current. At constant temperature this current is approximately linear with oxygen concentration, enabling direct oxygen-content calculation. The module measures 0.1%–40% O₂ with ±1% FS accuracy, integrates temperature, humidity and pressure compensation, and communicates via UART at 9600 bps. It is designed for long-term operation with a 5-year service life and a -40°C to +85°C operating temperature range.

• Zirconia limit current sensor — measures oxygen concentration from 0.1% to 40% with ±1% FS accuracy
• Integrated environmental sensors — temperature, humidity, and pressure compensation for accurate readings
• Fast response — t90 response time of less than 15 seconds with 60-second preheating time
• UART communication — 9600 bps serial interface with simple command protocol
• Multi-interface design — J1–J6 connectors for data, power, sensor, and OLED screen integration
• Wide operating range — -40°C to +85°C, 0–100% RH, 20–130 kPa, suitable for demanding environments

• The module is powered by 12V and requires 1 minute of preheating before outputting concentration data; readings stabilize after 30 minutes of operation.
• Do not plug or unplug the screen or sensor module during operation to avoid damage.
• Do not blow on the ion flow sensor quickly or spray high-speed air flow while the module is working; if gas introduction is needed, control the flow rate at 0.5 L/min.
• Users must not dismantle the sensor without authorization, including removing the metal mesh cover, as this may cause irreversible damage.
• It is strictly prohibited for use in the measurement of flammable mixed gas.
• Be cautious of high temperatures — the zirconia surface temperature during operation can reach 150°C; avoid burns and do not use in flammable or explosive environments.

Connector Overview

Table 1: Data Interface J1 (XHB-6A, 1×6P, 2.54mm pitch, with buckle)

Table 2: Data Interface J2 (XHB-4AW, 1×4P, 2.54mm pitch, without buckle)

Table 3: Power Interface J3 (XHB-3AW, 1×3P, 2.54mm pitch, without buckle)

Table 4: Data Interface J4 (1×4P pin array, 2.54mm pitch)

Table 5: Temperature, Humidity and Pressure Sensor Interface J5 (MX1.25-4PWT, 1×4P, 1.25mm pitch)

Table 6: OLED Screen Interface J6 (SSD1306, 1×4P, 2.54mm pitch, female header)

Product dimensions: W58.27mm × D42.11mm × H20.3mm. Unit: mm. Error: ±0.25mm (this error is followed where not marked).

The UART communication protocol and integration guide for GSTB-400H V1.2 is available upon request. Please contact our engineering team for the complete technical documentation.

For inquiries: Request Quote | Technical Support

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