Frequently Asked Questions

What is the maximum flow rate and delivery pressure achievable from a single unit?

Maximum flow rate is 5-6 slpm continuous delivery in the current design sizing for a single unit.

Maximum operating pressure is 45-50 psig without addition of external compressors to the system, although typical operating pressure would be 15-30 psig.

How long do the canisters last at maximum generated flow rate?

Arsine is generated with an electrochemical reaction inside the refillable stainless steel canisters. The reaction rate is proportional to the electrical current supplied to the cell.

Duration between canister changeouts would depend on the usage rate. Each canister is capable of delivering approx. 50 kg of arsine at 5 slpm.

What is the purity of the output from the generators?

Purity of the research-scale (less than 1.5 slpm) generators was 99.9999%, fully qualified for VCSEL production by Honeywell Optoelectronics (subsequently purchased by FINISAR)

The larger-scale generators now entering production are expected to result in similar purity

What are the largest canisters available and how large are the cabinets?

Cabinets are modular and pallet sized for ease of installation and shipping. Canisters are sized for easy insertion into the cabinets and contain approximately 50kg of arsenic.

A common industrial hand truck/ forklift or other similar device can be used to install the generators with one person

Canisters themselves are movable easily for replacement following refilling.

Are the canisters refillable and if so, what are the turn around times?

Yes, canisters are refillable.

They can be air-shipped anywhere giving a turnaround time of 5-7 business days for refill and delivery following return.

Currently, refill capabilities are in the New Jersey Premissa Ecoplex location and will be in China in 2020. Should demand warrant, Premissa could set up refill locations in other geographies.

To allow for continuous production and rapid swap out of canisters, we would suggest that a spare, filled canister be kept with each generator for operational simplicity.

Can the systems be manifolded together to get a higher flow?


Interestingly, our current customer in China plans to use the generators to replace existing chemical-based arsine production over time, retaining their current cylinder-filling/ delivery/ distribution model vs. co-location of equipment in the factories of their clients.

They are starting with two generators manifolded together to handle increasing market demands and allow continuous filling operations over two shifts.

An added advantage of the Premissa design is that gas generation is easily turned on and off without issues of production start/ stop typically encountered.

Due to both cost advantage and lessened environmental impact, their intent is to shift the bulk of arsine production to the generators over time and repurpose existing chemical-based production facilities

The key advantage of Premissa generators is that each is controlled for production at whatever level is desired and operate independently for fail-safe operation.

Response to any events impacting safety such as pipe leaks or system damage is instantaneous. Killing power to generators immediately stops arsine generation. This can be done manually via kill-switch or automatically via simple API integration with process control systems.