Teledyne 212R Output Signal, Span Setting 7.4 Recommended Accessory Gases, Reference Gas

Thermal Conductivity Analyzer Model 212R

7.2Output Signal:

Outputcoincideswith100%analysis.

4mA	=	0 ppm N2 in H2
20mA	=	50,000 ppm N2 in H2 - Range #1

=5000 ppm N2 in H2 - Range #2

= 500 ppm N2 in H2 - Range #3

7.3Span Setting: 555

7.4Recommended Accessory Gases.

H2 Purity	Zero Gas	99.999
H2 Purity	Reference Gas	99.999
	Span Gas	350-450 ppm N2 in H2

7.4.1 Reference Gas.

With a equivalent impurity of less than 3% of range 1. The impurity ratio must remain constant. When the reference gas supply is replaced, the analyzer mustbere-standardized.

7.4.2 Zero Gas.

Becauseofthedifficultiesinvolvedinobtainingagasinpureform,thezero gas must be purchased from a supplier who will certify the cylinderas to its content. The equivalent impurity concentration of the gas must be less than 3% of range 1. When the zero gas is introduced for standardization, the range switch must bein Range 1, and the zero control set such that the recorder indicatesthezerogasimpurity.

IMPORTANT: At startup, be sure that the span control dial is set to the number recorded in Section 7.3.

Teledyne Analytical Instruments 25