Teledyne 200A Teledyne API Model 200A NOX Analyzer Instruction Manual, 02246, Rev. G, DCN 5247 , Table 9-1: Test Functions (Continued) , 9-7 PRINTED DOCUMENTS ARE UNCONTROLLED

Teledyne API Model 200A NOX Analyzer Instruction Manual, 02246, Rev. G, DCN 5247

Table 9-1: Test Functions (Continued)

IZS TEMP 50 ± 0.4 C The IZS temperature is the temperature of the permeation tube

oven. This temperature is controlled by the CPU and is adjustable

in 0.1 C increments. This adjustment allows small changes in

permeation tube temperature so the permeation rate can be

adjusted to an even value. The control loop variations show a

temperature swing at the control thermistor of a few tenths of a

degree. Temperature fluctuations of the perm tube however are

less than 0.1 C. Warning limits are < 45 C and > 55 �� C.

RCEL PRESS 5 ± 1 in-Hg-A

(Thomas 607)

7 ± 2 in-Hg-A

(ASF internal)

RCEL is the pressure in the Reaction Cell. The instrument is very

sensitive to variations in reaction cell pressure. 10% change in

output per 1"Hg pressure is typical. The pressure reading will

change when going to the AutoZero cycle, otherwise it should

remain constant. Higher altitudes will decrease cell pressure due to

lower pump back pressure. Pressures out of the acceptable range

will decrease instrument noise performance and sensitivity.

SAMP PRESS 29.5"Hg at sea

level

The sample pressure is taken just upstream of the reaction cell. It

usually runs about 0.5" less than ambient pressure due to the

restrictions in the sample intake tubing. Sample pressure should be

within ± 1"Hg of atmospheric pressure. The pressure sensor used

reports absolute pressure and therefore is sensitive to altitude,

weather fronts, and room air conditioning. Changes due to altitude

is about 1" per 1000 ft., other changes are ± 0.4" maximum.

Pressurizing the sample inlet will cause the M200A to be noisy

and to shift its reading.

SLOPE 1.0 ± 0.3 This is the software slope value. It operates like a software gain

pot. Refer to Table 7-7-21 on Calibration Quality for additional

information.

OFFSET 0 ± 150 This is the software offset value. It operates like a software DC

offset pot. Refer to Table 7-7-21 on Calibration quality for

additional information.

TIME This is the time of day clock readout. It is used to time the

AutoCal cycles. The speed of the clock can be adjusted by the

CLOCK_ADJ variable in the VARS menu. The clock can be set

via SETUP-CLOCK-TIME from the front panel.

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