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Computerised multi-gas calibration system introduced by Environics

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article image Computerised multi-gas calibration system

  Lear Siegler's Environics series 6100 computerised multi gas calibration system is a computer controlled, state of the art instrument for dynamic calibration of ambient air analysers.

Series 6100 automatically performs zero, precision, span and multi-point calibrations using NO, NO2, SO2, CO, O3, hydrocarbons and other gases of interest. The 6100 meets or exceeds all U.S. environmental protection agency requirements.

Series 6100 consists of a single chassis supporting 2 thermal mass flow controllers, an ozone generation module, a mixing zone, a reaction chamber for gas phase titration and control electronics. Commands are entered from the front panel and displayed on a backlit 4 line by 20 character liquid crystal display.

The instrument may also be remotely operated using contact closures or the RS-232 serial data interface, both are standard in the series 6100.

The mass flow controllers are calibrated to a NIST (National Institute of Standards and Technology) traceable primary standard.

The calibration data consists of a comparison of desired versus actual flow over the full dynamic range of the instrument with linear interpolation between points. Calibration data is stored in non-volatile memory and may be updated by the user with a suitable standard.

Series 6100 ozone generator is factory calibrated using a NIST traceable ozone standard. This temperature controlled, ultra-violet (UV) based ozone generator includes a precision photo-optical feedback circuit to compensate for lamp aging effects.

Series 6100 is available in either a standard rack mount or portable configuration.

Series 6100 features and benefits:

User-friendly interactive software with plain language prompts is simple to use, reducing technician training time and virtually eliminating error

Automatic calculation of dilution and span gas flows based on commanded concentration eliminates the need for manual computation and allows rapid transition from point to point

Internally stored mass flow controller calibration data improves accuracy by as much as a factor of ten and simplifies field recalibration

Internally stored ozone generator calibration data insures linear, repeatable ozone generation without photometer control

Ozone generator performance exceeds U.S. EPA criteria for ozone transfer standards

Ozone generator pressure compensation ensures repeatable ozone generation at a flow rate and back pressure other than that at which it was originally calibrated

Full two-way RS-232 serial data interface standard permits remote operation of the instrument including data collection, gas selection, initiation of zero, span and multipoint calibrations.

Software:

Blend: in response to software prompting, user selects gas port, span cylinder gas concentration

Output: gas flow total and output gas concentration, series 6100 automatically delivers concentrations at the total flow specified

Generate ozone allows user to specify then generate a precise concentration of ozone

Gas phase titration utilizes blend and generate ozone routines to lead user through GPT using excess no method

Manual allows user to manually command a desired rate of flow for each mass flow controller

Display allows user to monitor flow rates for each mass flow controller separately. Also provides ozone oven block temperature during generate ozone and gas phase titration routines.

Maintain Ports: User enters the name of the span as in the source cylinder, its concentration (ppm) and the port to which the cylinder is connected.

Specifications:

Mass flow controller as a percent of setpoint from 10 to 100% accuracy of full scale flow concentration: ± 1.0% Flow: ± 1.0% Repeatability ± 0.05%

Mass flow controllers are calibrated using a NIST traceable primary flow standard using a reference temperature of 25o C (77oF) and a reference pressure of 760mm Hg (29.92 in. Hg)

Warm up time: 30 minutes ozone generator concentration range: 0.02 - .5 ppm at 5 – 10 slpm optional ranges: .05 - 1 ppm at 5 – 10 slpm .10 - 6 ppm at 5 – 10 slpm

Other ranges available upon request accuracy: ±2% or ±.003ppm

30 day repeatability: ±2% or ±.003ppm mechanical inlets

Balance: external ¼" Swagelok

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