Bacharach 2820 Specifications download pdf (Page 14)

Analyzer 2810/2815/2820

Instruction 19-9222

3.7 Calibration

Calibration of a 2810/2815/2820 CO

Analyzer consists of rst performing

either an Air Calibration on a 2810/2815 analyzer that zeros the instru-

ment using fresh ambient air, or an N

Calibration on a 2820 analyzer

that zeros the instrument using 100% N

Factory calibration provides the best accuracy over the analyzer’s entire

detection range; however, the user can perform the optional Gas Cal-

ibration procedure that will improve the analyzer’s accuracy at a pre-

programmed calibration point of 2,500 ppm CO

for the 2810/2815, and

5% CO

for the 2820. Note that the pre-programmed calibration point can

be changed using BACH-COM software version 2.22 or higher.

It is recommended that an Air Calibration or N

Calibration be per-

formed at the beginning of each work day or each time the instrument

is switched OFF/ON. The analyzer should also be checked on a periodic

basis with a higher concentration of CO

to ensure that it still meets its

accuracy specication.

Follow the procedure under Section 3.7.1 to calibrate a 2810/2815 Low

Range (LR) Analyzer, or the procedure under Section 3.7.2 to calibrate a

2820 High Range (HR) Analyzer.

3.7.1 2810/2815 Calibration Procedure

3.7.1.1 Air Calibration

Perform this procedure in an uncontaminated enviroment such as out-

side fresh air, an empty room, or corridor where the air is assumed to

contain 340 ppm CO

Important! DO NOT perform an air calibration after sam-

pling high concentrations of CO

gas. Also, be careful that

your breath does not affect this procedure.

1. Switch ON the analyzer, and then allow it to sample fresh air for

5 minutes. During this time, the internal pump of a 2815 Analyzer

should be turned OFF.

→

CO2 LR ppm CO2

Analyzer 340

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Bacharach 2820 Specifications Page 14