Environics Series 6100 Ambient Multi-Gas Calibration/Dilution System

The Environics® Series 6100 Multi-Gas Calibration/Dilution System is designed for dynamic multi-point gas calibration of ambient air analysers when working with low-level gases (below 1%).

The Series 6100 automatically performs zero, precision, span and multi-point calibrations using NO, NO₂, SO₂, CO, hydrocarbons and more. Custom options can be chosen for calibrating ammonia, HCl and a range of other gases. It is a good choice for dilutions from ppm or lower-level cylinders; for higher dilution ratios, see the Environics Series 4020 and 4040 gas dilution systems.

A single chassis holds up to three thermal mass flow controllers, an inline mixer and the control electronics. Units can be built for 120 V, 240 V or 24 V operation. Commands are entered on the front panel and shown on a backlit 4-line by 20-character LCD, and the instrument can also be operated remotely by contact closures or the RS-232 serial interface, both fitted as standard.

Two mass flow controllers are standard, and a third can be added for a wider range of dilutions. The mass flow controllers are calibrated against a NIST-traceable primary standard; the calibration data compares desired and actual flow over the full range, with linear interpolation between points, and is stored in non-volatile memory where it can be updated by the user with a suitable standard. The Series 6100 is available in standard rack-mount or portable form.

Features and benefits

• Interactive software with plain-language prompts, reducing technician training time and virtually eliminating error
• Automatic calculation of dilution and span gas flows from the commanded concentration, for rapid point-to-point changes
• Internally stored mass flow controller calibration data improves accuracy by up to a factor of ten and simplifies field recalibration; mass flow controllers are factory calibrated at 11 points
• Full two-way RS-232 serial interface (standard) for remote operation, including data collection, gas selection and starting zero, span and multi-point calibrations
• New options include a purge feature and up to six span ports

Instrument operation

• Concentration mode: the user selects the gas port, span (cylinder) gas concentration, total output flow and output concentration, and the 6100 delivers that concentration at the specified flow.
• Flow mode: manually command the flow for each mass flow controller, individually or together.
• Display: monitor the flow rate of each mass flow controller separately.
• Maintain ports: enter the span gas name, its concentration (ppm) and the port the cylinder is connected to.

Options

• Third mass flow controller
• Purge circuit
• Rack mount
• Extra gas inlets: up to 6 span ports with 2 MFCs, or up to 5 with 3 MFCs
• Permeation oven
• Humidification
• Heated flow path
• Silicon-coated gas path
• Various seal materials, including Teflon® and Kalrez®
• Cleaned for oxygen service