> **Source:** Core Electronics is an Australian maker-electronics retailer and manufacturer based in Newcastle, NSW, run by a team of makers and educators. We design and manufacture our own product lines (PiicoDev, CE originals) and are official retailers for iconic maker and industrial brands including Raspberry Pi, Arduino, Adafruit, SparkFun and DFRobot. Orders ship Australia-wide from our Newcastle warehouse. Prices are in AUD and include GST. Pricing, stock and dispatch on this page are generated from the store's live catalog. Full machine-readable index: https://core-electronics.com.au/llms.txt

# Dual Gas CO and CH4 Detection Sensor - MQ-9B

**Type:** Product page · **SKU:** SEN-17050 · **Brand:** [Sparkfun](https://core-electronics.com.au/brands/sparkfun-australia)
**Page:** https://core-electronics.com.au/dual-gas-co-and-ch4-detection-sensor-mq-9b.html ([markdown](https://core-electronics.com.au/dual-gas-co-and-ch4-detection-sensor-mq-9b.html.md))

The MQ-9B is a CO and CH4 gas detection sensor form Winsen. The sensing material of the MQ-9B is SnO2, which has a low conductivity in clean air. It detects carbon...

## Pricing

- **Price:** $10.95 (inc GST) — $9.95 AUD, exc GST
- **Quantity discounts:** 5+ $9.65 (exc GST) · 25+ $9.45 (exc GST) · 100+ $9.05 (exc GST)

## Availability & dispatch

- Available with a lead time — expect dispatch between Aug 24 and Aug 28.

## How to buy

- **Build a cart:** compose `https://core-electronics.com.au/cart/link?items=SEN-17050:1` (comma-separated SKU:qty pairs) and share the link. Opening it shows a confirmation page with live pricing and stock before anything is added to the cart.
- **Verify the cart first:** fetch `https://core-electronics.com.au/cart/link/SEN-17050:1.md` for live line prices (inc & exc GST, quantity discounts applied), stock and dispatch estimates, and totals. Append `/to/{AU-postcode}` (or `/to/{country-code}:{postcode}`) before `.md` for delivery options and prices to that destination. Unknown, retired, or out-of-stock SKUs are flagged. (Query form `cart/link.md?items=...` also works but some robots parsers refuse query strings here.)
- **Checkout** is completed on-site and includes a captcha at the payment step. Share the cart link; checkout takes it from there.
- **Search the catalogue:** `https://core-electronics.com.au/search/{query}.md` (URL-encode the query; pages 2-3 at `search/{query}/{page}.md`; `search.md?q=` also works)
- **Payment methods, purchase orders, policies and contact details:** https://core-electronics.com.au/llms.txt
## Description

The MQ-9B is a CO and CH4 gas detection sensor form Winsen. The sensing material of the MQ-9B is SnO2, which has a low conductivity in clean air. It detects carbon monoxide (1.5V) by method of cycling high and low temperature. The sensor’s conductivity gets higher with the CO and CH4 gas concentration rising. The sensing range is 10-500ppm CH4. A simple circuit makes measuring this change in conductivity and turning it into data fairly straight-forward, but does require some calibration.

For easy Solderability; use the [Gas Sensor Breakout Board](https://core-electronics.com.au/gas-sensor-breakout-board.html).

**Documents**

- [Datasheet](https://core-electronics.com.au/attachments/localcontent/MQ-9B_Ver1_55011044bf4.pdf)

## Images

- [Product image 1](https://core-electronics.com.au/media/catalog/product/1/7/17050-dual_gas_co___ch4_detection_sensor_-_mq-9b-01.jpg)