N701 Zero Air System

The N701 is a fully self-contained source of clean, dry air for dilution calibrators. It can also simultaneously be used as a pressure source for activating instrument pneumatic valves and/or purge air for permeation tube ovens. The N701 includes a dewpoint sensor, an oil-less and diaphragm-free pump, and scrubbers to remove SO2, NO, NO2, O3, H2S, and NH3. An optional high performance heated converter is available for effective removal of Carbon Monoxide (CO) and Hydrocarbon gases. The regenerative, heatless dryer removes water and produces output with a dew point of less than -20°C (flow rate of up to 30 SLPM at 30 psig, at sea level). The system's pressure, temperature, and dew point values are all continuously monitored, which allows a microcontroller to adjust the pump cycling frequency, valve timing, and heater power for optimal performance. The N701 has optional digital communications including RS232 and TCP/IP with Modbus communications. This allows remote monitoring of key instrument functions including dewpoint status, scrubber temperature, box temperature, and output pressure. Additionally, this digital access provides the ability to remotely disable the internal pump, allowing longer service intervals and less power consumption. The user can also remotely start instrument warm-up prior to arrival at the site.​