Attachment 1 

BAAQMD Source Test Results and Procedure
Bay Area Air Quality Management District

ST-6-1

Source Test Procedure ST-6

CARBON MONOXIDE, CONTINUOUS SAMPLING

REF: Regulation 8-1-110.3, 10-8-301

1. APPLICABILITY

1.1 This method is used to quantify emissions of carbon monoxide (CO). It

determines compliance with Regulation 8-1-110.3.

2. PRINCIPLE

2.1 A continuous representative gas sample is extracted from the sampling point

and conditioned to remove water and particulate material. The carbon

monoxide concentration is determined by passing small portion of the

sample through a non-dispersive infrared analyzer (NDIR) tuned to a

frequency at which carbon monoxide absorbs infrared radiation.

3. RANGE AND SENSITIVITY

3.1 The minimum and maximum measurable concentrations of CO depend on

the sample cell length in the analyzer.

3.2 The minimum sensitivity of the NDIR analyzer shall be ± 2% of full scale.

4. INTERFERENCES

4.1 Cyanogen and methyl azide are possible interfering species.

5. APPARATUS

5.1 Carbon monoxide analyzer.

5.2 Chart Recorder. The recorder monitors and records the continuous output

from the analyzer.

5.3 Sample conditioning, zero air, and span gas system. The assembly of this

system is shown in Figure 6-1. The sample conditioning system provides a

dry, particulate free gas flow to the instrument. The zero air system provides

clean dry atmospheric air for instrument calibration. The span gas system

provides a known concentration of CO for use in calibrating the analyzer.

Except as specified, all materials which come in contact with either the

sample or span gases must be constructed of Teflon or stainless steel.

5.4 Sample Probe. Use a borosilicate glass tube of sufficient length to traverse

the stack being tested. If the stack temperature exceeds 425 oC (800 oF),

use a quartz probe. Other probes are acceptable subject to approval by the

Source Test Section.

5.5 Condensers. Use modified Greenberg-Smith impingers with the impaction

plates removed and the inlet tube shortened to a length of 10 cm (4 inches),

or equivalent.
MOP Volume IV. ST-6 Carbon Monoxide, Continuous Sampling

Bay Area Air Quality Management District

ST-6-2

5.6 Cooling System. Immerse the impingers in an ice bath during the test.

5.7 Particulate Filter. Use a Balston type 95 holder with a grade B filter, or

equivalent, in the sample system.

5.8 Pumps. Use leak-free, Teflon-lined, diaphragm pumps in the sample and

zero air systems. The pumps must have a capacity of at least 28 liters/min

(1.0 CFM).

5.9 Back-pressure Regulator. Use a back-pressure regulator to maintain the

sample and zero gas sample pressures to the instrument at five psig.

5.10 Gas Scrubber. Use a bed of silica gel, Ascarite (or soda-lime), and charcoal

to remove moisture, carbon monoxide, and hydrocarbons from the zero air

system.

5.11 Span Gas. Use a high-pressure cylinder containing a known concentration

of CO in air or nitrogen. The span gas concentration must be in the same

range as the source being tested.

Figure 6-1
MOP Volume IV. ST-6 Carbon Monoxide, Continuous Sampling

Bay Area Air Quality Management District

ST-6-3

6. PRE-TEST PROCEDURES

6.1 Warm-up the instrument according to manufacturer's instructions.

6.2 Assemble the sampling system as shown in Figure 6-1.

6.3 Leak-test the sampling system by starting the pump, plugging the probe,

and determining that the pressure to the analyzer falls to zero. Other leaktests are acceptable subject to the approval of the Source Test Section.

6.4 Introduce zero air, into the analyzer and zero the instrument ac cording to

manufacturer's instructions.

6.5 Introduce span gas into the analyzer and calibrate the instrument according

to manufacturer's instructions.

6.6 Conduct a preliminary concentration traverse (according to ST-18) to

determine if stratification of the stack gases exists. If the CO concentration

at any point differs from the average concentration by more than 10%,

traverse the stack during the test. If not, sample at any single point.

6.7 Set-up the chart recorder according to manufacturer's ins tructions.

7. SAMPLING

7.1 Each test run shall be of thirty minute duration when testing from continuous

operations. Each test run at a batch process operation shall be for 90

percent of the batch time or thirty minutes, whichever is less.

7.2 Introduce sample gas into the analyzer at the same flow rate used to

calibrate the analyzer.

7.3 Maintain ice in the cooling system throughout the test.

7.4 Calibrate the analyzer before and after each test run. Record each step of

the process clearly on the chart recording.

7.5 Conduct three test runs.

8. CALCULATIONS

8.1 From the chart recording determine the time-averaged concentration of CO

on a dry basis for each run.

9. REPORTING

9.1 Report the results indicated on Figure 6-2.

9.2 These values are also determined as auxiliary data for other procedures and

shall be reported with those test results.
MOP Volume IV. ST-6 Carbon Monoxide, Continuous Sampling

Bay Area Air Quality Management District

ST-6-4

Figure 6-2

Report No.: 

Test Date: 

BAY AREA

AIR QUALITY MANAGEMENT DISTRICT

Summary of

Source Test Results

Test Times:

Run A: 

Run B: 

Run C: 

Source Information Test Representatives

Firm Name and Address Firm Representative and Title

Phone No. ( )

Permit Conditions: Source: Operating Parameters

Plant No. Permit No.

Operates Hr/Day & Day/Yr.

Applicable Regulations:

Source Test Results and Comments:

METHOD TEST RUN A RUN B RUN C AVERAGE LIMIT

Run Time, Minutes

Stack Gas Temperature, oF

ST-6 Carbon Monoxide, ppm

Test Team Leader Date Reviewed by Date Approved By Date