ESBD_434674_1752242263153_582-25-10662 Attachment A.pdf

Solicitation Name: Dynamic Dilution Calibrator Solicitation Number: 582-25-10662

Attachment A

Specifications for Dynamic Dilution Calibrator

Description: Dynamic dilution calibrator; microprocessor controlled for accurately diluting concentrated gases with air. Gas/air flows controlled and measured by separate microprocessor controlled mass flow controllers.

MINIMUM GENERAL SPECIFICATIONS

1. Shall dynamically mix a component gas with a balance gas (zero air) at total flow rates up to 20 liters per minute (LPM) using automatic computation of component and balance gas flow rates.

2. Shall have a built-in stable ozone generator to provide precise and accurately known ozone concentrations (0-1 parts per million [ppm]) using an ultraviolet (UV) lamp for ozone generation. The system shall incorporate an internal UV photometer in a feedback circuit to control the generation of ozone to produce a constant, stable, and repeatable ozone concentration at the specified flow rate.

3. Shall have gas phase titration of nitric oxide and ozone for the generation of nitrogen dioxide at precise levels.

4. Shall be a freestanding benchtop single cabinet model weighing no more than 50 pounds.

5. Shall have front panel alphanumeric display and keypad for manual data input.

6. Gas and air flows shall be controlled by microprocessor supported precision mass flow controllers (MFCs). The Texas Commission on Environmental Quality (TCEQ) requires three MFCs. One diluent MFC with a range of 0-20 LPM and two source MFCs with flow rates of 0-200 and 0-20 standard cubic centimeters per minute (sccm). The calibrator must normally use the 0-200 sccm MFC and automatically switch to the 0-20 sccm MFC when the requested gas flow rate is less than 20 sccm.

7. Total flow, individual source, and diluent flow rates shall be available for monitoring via the display. The display shall also provide target, actual source, and ozone concentrations; ozone photometer and chassis temperatures; calibration constants for each MFC, ozone generator, and ozone photometer; and other operating parameters.

8. The calibrator shall include a battery backed-up electronic clock that includes 24-hour time, days, months, and years. The clock shall be settable via the keypad (also remotely) and continue to operate during power outages. The clock will be time synched to the system one or more times weekly via RS-232 commands.

9. The calibrator shall restart itself after a power outage and shall not require readjustment or recalibration upon resumption of power.

10. Calibration data for the flow controllers and ozone generator shall be stored internally and be recallable. MFC calibration data shall utilize a corrective algorithm with at least a ten-point comparison of commanded versus actual flow with linear interpolation between points at a minimum. Data for the ozone generator shall consist of at least ten points of percentage lamp intensity or drive voltage versus ozone output. The TCEQ requires a calibrator that is capable of delivering 0.01 to 1 ppm of ozone at flow rates of 4.5 LPM with an accuracy of plus or minus (±) five percent (%).

11. Shall have a minimum of four operating modes.

A. Blend: By controlling the system from the front panel, the user shall be able to specify the port at the rear of the chassis for cylinder gas (input gas port), the cylinder gas concentration, the required dilution, and the concentration of the output gas. The system will automatically open the correct solenoid and allow cylinder gas to flow at the correct rate to mix with the correctly controlled dilution gas and provide the desired blend at the rear output at the desired concentration.

B. Blend with gas phase titration (GPT): As in 11.A with appropriately mixed ozone to produce the desired level of nitrogen dioxide.

C. Manual: As in 11.A and 11.B with manual selection of all parameters.

D. Set-timer mode: As in 11.A and 11.B except by presetting levels and sequences of levels. Shall provide at least 20 sequences of up to 99 levels that may be set up on a repeating schedule. This permits the calibrator to run automatic, periodic calibrations of up to six different gases (including ozone and GPT produced nitrogen dioxide) of various blends. Calibrator should also provide input/outputs for controlling external valves for routing of gas. These valves draw about 1.0 amperes (amps) at 12-voltage direct current (DC).

12. The system shall have both a reaction chamber for combining ozone and nitrogen oxide gas and a dilution/mixing chamber for mixing and/or dilution of gas blends.

The ozone generator’s constant flow output goes directly to the reaction chamber.

The output of the reaction chamber flows directly to the mixing/dilution chamber and mixes with dilution gas.

13. Shall have one dilution gas input (commonly zero air) with a single 0-20 LPM MFC.

There shall be six gas inputs, each isolated and controlled by a separate normally closed solenoid valve. The gas valves feed common 0-200 sccm and 0-20 sccm MFCs.

14. The MFC’s accuracy and repeatability from 10 to 90% of full scale shall be at least ±0.5% with a response time to within 2% of set point of 15 seconds or less.

15. All gas handling components shall be constructed of non-reactive materials;

Teflon, stainless steel, glass, or equivalent.

16. The system shall be able to operate between 10 and 50 degrees Celsius (C).

17. Power requirements shall be 90-115 voltage alternate current (VAC) and 60 hertz (Hz).

18. The calibrator shall have an RS-232 serial data port (DB-9) to provide for data input and provide information about calibrations being performed, report various operating parameters, etc. All internal programming shall be addressable via these ports for modifications, upgrades, calibration etc.

19. The ozone generator shall be temperature controlled and be insensitive to ambient light and temperature variations.

20. The rear air input shall be a 0.25-inch Swagelok® compatible compression fitting.

The rear gas input fittings are to be 0.125-inch Swagelok® compatible compression fittings. The output gases shall have 0.25-inch Swagelok® compatible compression fittings.

SPECIAL REQUIREMENTS

1. These instruments are to be integrated into an existing complex calibration and data logging system (data acquisition system) and must therefore perform and operate exactly as the existing calibrators already in place.

2. Physical: Freestanding cabinet with display and manual key entry at front (no heavier than 50 pounds). Gas and air inlets and outlets at the rear. DB-9 connector (male) and solenoid driver output at the rear. The solenoid driver connector shall mate with a Weidmuller BL series plug 12601-6. The pin out configuration of this connector shall match existing connectors and wiring. The drive for the solenoids shall be an open collector type to pull 12 volts to ground with up to 1.5 amp load.

3. Operating system (internal software): The calibrator shall work by providing concentration levels of test gases and timed sequences of those concentration levels. The concentration levels are defined by two numbers, the first is keyed to the gas produced (1 = NO, 2 = SO2, 3 = CO, 4 = H2S, 5 = NO2, 6 = O3, 7 = CH4, 8 = NOx). The second number indicates the gas concentration. Example: level 66 is ozone 400 parts per billion (ppb) at 4.5 LPM. Sequences are numbered one to twenty with no significance to the number. Levels are defined by flow and concentration. Sequences consist of levels, duration, and valving. Gas inputs follow the level first number as consistently as possible i.e. inlet #1 is for NO, #2 is SO2, etc. Since there are more gases used in our system than we have inputs, a single calibrator can only provide four test mixtures (plus ozone).

4. The calibrator can be set up to automatically time and program sequences and also have sequences started externally. Levels and sequences can be programmed into the calibrator either remotely or manually and will be retained in the calibrator’s memory. The calibrator shall report the status of the running sequence and level when interrogated.

5. The nomenclature used with the levels and sequences includes additional information called status blocks, which provide additional data to the data retrieval system.

6. The calibrator communicates with the data retrieval/control system via a system called “dot commands.” This system involves a higher language for control/reporting.

SPECIAL TERMS AND CONDITIONS

1. All items must be bid new, of current production, and include the manufacturer’s standard parts and accessories.

2. Responsive bids must include total estimated shipping charges.

3. Delivery must be made to the Texas Commission on Environmental Quality, 12100 Park 35 Circle, Building B, Austin, Texas, 78753. Routine delivery response to TCEQ will be within 120 calendar days after receipt of order.

4. Equipment shall be shipped Freight on Board/Free on Board (FOB) Destination. The seller shall be responsible for the cost of transporting merchandise to the TCEQ delivery address listed above and the TCEQ will take delivery of shipped goods once the goods arrive at the TCEQ warehouse.

5. The warranty period should consist of complete coverage of system onsite, parts, and labor for a minimum of two years from the date of acceptance.

6. An electronic manual (styled: Instruction Manual, Operator’s Manual, Operation and Service Manual, etc.) must accompany each instrument order. The manual will include complete operating instructions, circuit descriptions, theory of operation, location of controls and switches, software commands, maintenance, and service instructions. The manual will also include schematic diagrams, pneumatic flow charts, lists of commonly replaced parts, warnings, and safety precautions.

7. In-house training for TCEQ staff should be provided at no additional costs to TCEQ for maintenance and diagnostic repair.

8. Technical support must be available for TCEQ staff between the hours of 8 a.m.

and 5 p.m. Central Standard Time (CST) during regular business days, Mondays through Fridays, via both telephone access and electronic mail (e-mail).

SPECIAL TERMS AND CONDITIONS