Certification Procedures Of Working Standards; Table 7-18: Nist-Srm - Teledyne 200A Instruction Manual

Teledyne API Model 200A NO
Table 7-18: NIST-SRM's Available for Traceability of Calibration and Audit Gas
4
NIST-SRM
1683a
1684a
1685a
Permeation Tubes
4
NIST-SRM
1629
Cylinders of working gas traceable to NIST-SRM's (called EPA Protocol Calibration Gas) are also
commercially available (from sources such as Scott Specialty Gases, etc.).

7.8.12 Certification Procedures of Working Standards

If the assayed concentration of NO
[NO ]
2 imp
procedure, make certain that the NO delivery system is not the
source of contamination before discarding the NO standard.
The NO content of the NO working standard must be periodically assayed against NIST-traceable
NO or NO standards. Any NO
2
NO working standard should be made on a quarterly basis or more frequently, as required.
Procedures are outlined below for certification against NO traceable standard. The simplest and most
straightforward procedure is to certify against an NO standard.
Analyzer Instruction Manual, 02246, Rev. F1
X
Standards
Type
Nitric oxide in N
Nitric oxide in N
Nitric oxide in N
Type
Nitrogen dioxide
, is greater than the 1 ppm value allowed in the calibration
impurity in the cylinder must also be assayed. Certification of the
2
Size, at STP
870
2
870
2
870
2
Permeation rate,
ug/min
1.0
NOTE
impurity in the NO cylinder,
2
7-32
Nominal
Concentration
50 ppm
100 ppm
250 ppm
Concentration, ppm
at flow rates of:
1 L/min/5 L/min
0.5/0.1