Senko SI-301 Sampling Fixed Gas Detector

The SI-301 draws its sample to the sensor rather than waiting for the gas to arrive. That is the whole point of it, and it solves a specific set of problems that a diffusion detector cannot.

When you need to sample rather than wait

A diffusion detector has to be mounted where the gas will be. Sometimes you cannot put an instrument there. The gas is inside a duct, or inside a gas cabinet, or inside an enclosure that is under negative pressure, or in a location where nobody can reach the detector to calibrate it. A sampling detector lets you mount the instrument somewhere accessible and run a sample line to the point you actually want to measure.

It also gives you something a diffusion detector does not: a flow indication. If the sample line blocks, you know. A diffusion sensor behind a clogged filter reads clean air and tells you nothing is wrong.

Semiconductor process gases

The SI-301 gas list is the most specialized in the Senko range and it reflects where these instruments get installed. Silane, disilane, BTBAS, BDEAS, DIPAS, 3DMAS, TEOS, tetramethylsilane and trimethylamine are deposition and precursor chemistries, measured across single digit to low tens of ppm. Where these are stored or used indoors as compressed gases, International Fire Code Chapter 60 requires a gas detection system capable of detecting at or below the permissible exposure limit or ceiling limit for the gas. See toxic gas monitoring for laboratories and semiconductor facilities.

What you get

• Explosion proof structure, IP65
• Cartridge sensor for straightforward replacement
• Built in flow control, with digital flow indication alongside the concentration
• Large LCD, four button control, RS-485, TCP ethernet and Bluetooth

Ordering

Select the gas and range from the list. The SKU shown is the Senko part number. Sample tubing and fittings are specified per installation and are not included.