Environics Product Data

Product Data
Series 2020
Computerized Gas Dilution System

DESCRIPTION

The Environics^® Series 2020 Computerized Gas Dilution System automatically generates precise gas standards for rapid multi-point and multi-scale calibrations. The Series 2020 precisely dilutes high concentration Protocol-1 or certified gas cylinders to an infinitely variable range of concentrations from high percents to low parts per million. The instrument meets or exceeds the performance requirements of the new United States EPA 40 CFR Part 51 Method 205 Appendix M.

The Series 2020 consists of a single chassis supporting up to six (6) mass flow controllers (standard configuration), a serpentine pre-mix zone and a zero dead-space final mixing zone. Gas wetted surfaces are Electropolished 316 stainless steel. Seals are gas-compatible elastomer. The user interface includes a back-lit 80 character by 25 line cold-cathode liquid-crystal display and membrane keypad.

The instrument's mass flow controllers are factory calibrated using a computer controlled primary flow standard traceable to the United States' National Institute of Standards and Technology (NIST). The calibration data consists of an eleven-point comparison of commanded versus actual flow with linear interpolation between the points.

The Series 2020 is available in a standard 19 inch rack mountable configuration for station or van usage or a portable bench-top version.

The optional RS-232 data interface permits remote or computer operation of the instrument.

PRODUCT FEATURES AND BENEFITS

Broad range of dilution ratios (1:1 - 10,000:1, standard) allows the user to significantly reduce the number of gas cylinders needed to perform compliance tests.
Broad dilution ratio capability allows calibration of most analyzer ranges from one cylinder of each gas specie significantly reducing gas costs, transport and handling labor.
Automatic calculation of dilution and span gas flows based on the concentration commanded by the user eliminates the need for manual computation and allows rapid transition from point to point and scale to scale.
Internally-stored mass flow controller calibration data improves accuracy.
High capacity memory permits storage and recall of up to 200 calibration "recipes" saving time and reducing errors.
25 line by eighty 80 character display permits viewing of data in worksheet form.
RS-232 Serial Data Interface permits remote operation and complete integration with a computer-controlled system.
Automatically calculates K-factors using system gas library.

SOFTWARE

The Series 2020 has six primary routines

Concentration Mode: User enters Target Output Gas Concentration (PPM or %) for the span gas. The actual concentration is displayed during mixing.
Flow Mode: User enters Target Flow Rate (cc's per minute) for the span gas and dilution gas. Actual flow rates are displayed after mixing is initiated.
Maintain Ports: User enters the name of the span gas in the source cylinder, its concentration (PPM or %) and the port to which it is connected.
Status Output: (Optional) Allows user to remotely activate different modes of the system and also activate external devices.
Automatic Sequencer: Permits unattended automatic operation of the instrument on a programmable seven-day schedule.
Divider Mode: Allows the user to operate the instrument as a computerized ten (10) step gas divider.

SPECIFICATIONS

Performance (as a percent of setpoint)

Accuracy              From 10 to 100% of Full Scale Flow
   Concentration:         ą 1.0%
   Flow:                  ą 1.0%
Repeatability:             0.05%

NOTE: Mass flow controllers are calibrated using a NIST Traceable Primary Flow Standard,
using a reference temperature of 0°C (32°F) and a reference pressure of 760 mm Hg (29.92 in. Hg).

Warm up time: 30 minutes

Mechanical

Gas connections
  1/4" Swagelok (or compatible fitting)

Operating Pressures
  Minimum:       10 psig (0.67 Bar)
  Recommended:   25 psig (1.68 Bar)
  Maximum:       75 psig (5.04 Bar)

Wetted Surfaces
  Tubing:       Electropolished 316 Stainless Steel
                (Optional - Teflon, Hastelloy, Monel)
  MFC's:        Stainless Steel (Optional - Hastelloy, Monel)
  Seals:        Viton^® (Optional - Kalrez^®, Buna-N, Neoprene, Metal)

Operating temperature:    32° - 122° F   (0° - 50° C)
Performance temperature:  59°  - 95° F  (15° - 35° C)

Weight
  Minimum:      35 lbs. (16 Kg.)
  Maximum:      70 lbs. (32 Kg.)

Dimensions (w x h x d)
  Portable:  17" x 7" x 23.5"
             (43.18 cm x 17.78 cm x 59.69 cm)
  Rack:      19" x 7" x 23.5"
             (48.26 cm x 17.78 cm x 59.69 cm)

Electrical

  Standard:  115 VAC (100 to 130 VAC), 50/60 Hz
  Optional:  220 VAC (200 to 260 VAC), 50/60 Hz
  Current:     3 Amps (maximum)

Electronics

  Inmos T 400 series, 32 bit processor
  12 bit A/D and D/A conversion

Operating Modes

  Front panel membrane keypad
  Internal timer control
  RS-232 terminal mode / Remote computer control (optional)
  Status board interface (optional)
  Other communications options available

Data Output

  Optional RS-232 serial port / Parallel printer port interface

OPTIONS

Serial/Parallel Port Interface
Status Board
Additional Gas Circuits, Component or Dilution
Purge System
Solenoid Valve on Output
Rack Mountable Case
Heated Flow Path
Humidification
Pressurization

Viton^® and Kalrez^® are registered trademarks of Dupont Dow Elastomers