Bacharach 2820 Specifications download pdf (Page 20)

Analyzer 2810/2815/2820

Instruction 19-9222

Wait until the analyzer automatically switches to its ‘N2/Gas’ screen

before proceeding.

f1-> N2

f3-> Gas

3. Press the f

button to display the Gas Calibration screen.

f1->05.0

00.0

The top line shows the preset calibration gas value that must be ap-

plied to the analyzer’s inlet. The bottom line shows the current CO

reading.

Note: The analyzer is most accurate around the calibration

gas value. If the analyzer, however, is routinely used to moni-

tor CO

levels that are much higher or lower than the preset

value, then it is recommended that the analyzer be calibrated

on a concentration of gas that is close to the gas level being

monitored. This operation requires that the preset calibration

gas value be reset higher or lower using the optional BACH-

COM software, version 2.22 or higher.

4. Remove the 100% N

cylinder (if used); then attach a CO

calibration

gas cylinder to the inlet of the analyzer as shown in Figure 3. The ap-

plied CO

concentration must equal the gas value displayed in the top

line of the Gas Calibration screen.

Important: Do not attempt to calibrate the analyzer if the

pressure gauge closest to the tank reads below 5 psi.

5. Adjust the regulator attached to the gas cylinder for an outlet pressure

of 2 psi (equivalent to a ow rate of approximately 120 cc/minute). Ob-

serve that the gas level displayed on the second line of the Gas Calibra-

tion screen should slowly rise to the value displayed in the top line.

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Bacharach 2820 Specifications Page 20