How do I set the CO concentration range on the Teledyne API Model 300 CO Analyzer?

You can set the CO concentration range by accessing the SETUP-RNGE-MODE menu and choosing between single, dual, and auto range modes. The default range mode is single range mode.

What are the differences between single, dual, and auto range modes on the Teledyne API Model 300 CO Analyzer?

In single range mode, both analog outputs REC and DAS are set to the same range. In dual range mode, you can select different ranges for the REC and DAS analog outputs. In auto range mode, the analyzer automatically switches between the Low and High range depending on the concentration.

How can I adjust the analog output offset on the Teledyne API Model 300 CO Analyzer?

You can adjust the analog output offset by pressing SETUP-MORE-DIAG, followed by selecting the appropriate submenu. The default output offset is 0 mV.

Setting the CO concentration range, Single range mode SNGL

If the clock speed adjust variable has already been set to a value other than 0 and the speed is still too fast or too slow, ADD the required adjustment to the current value of the variable. For example if the clock speed adjustment is already set to +10 and the clock is 5 seconds too slow per day, add +5 to the current value, yielding +15 as the new value.

4.6 Setting the CO concentration range

The CO concentration range is the concentration value that corresponds to the maximum voltage output at the rear panel (usually 5 volts). The M300 can operate in one of three analog output Range Modes. The Range Mode can be changed through the SETUP- RNGE-MODEmenu. The modes are described below:

4.6.1 Single range mode (SNGL)

In this mode, both analog outputs (REC and DAS) are set to the same range. This range can be set to any value between 1 and 1,000 ppm and is accessed through the SETUP- RNGE-SETmenu. This is the default range mode for the analyzer.

4.6.2 Dual range mode(DUAL)

Selecting dual range mode will allow you to select different ranges for the REC and DAS analog outputs. The two ranges are called Low and High. The REC output at the rear panel is used for the Low range and the DAS output is used for the High range. To set the ranges press SETUP-RNGE-SETand select which range you want to edit followed by ENTR.

The High and Low ranges have separate slopes and offsets for computing the carbon monoxide concentration. Therefore, the two ranges must be independently calibrated. See Section 3.1.2 for details on calibrating the two ranges.

4.6.3 Auto range mode(AUTO)

In auto range mode, the analyzer automatically switches between the Low and High range depending on the concentration. When the CO concentration increases to 98% of the Low range value, the analyzer will switch to the High range. The analyzer will remain in the High range until the CO concentration drops to 75% of the Low range value. It will then switch back to the Low range. Auto ranging changes the range for the REC and DAS outputs simultaneously. To set the ranges press SETUP-RNGE-SETand select which range you want to edit followed by ENTR.

4.7 Setting the analog output offset

In order to permit the Analyzer to connect to a wider variety of strip chart recorders and other instruments, the analog output of the carbon monoxide readings can be adjusted by up to +500 mV for 0-5V range (or +10% of current analog output range) in software. The default output offset is 0 mV. To change it, press SETUP-MORE-DIAG,press

P/N 02163G1 Teledyne API Model 300 CO Analyzer Instruction Manual - Page 41

Teledyne 300 Setting the CO concentration range, Setting the analog output offset

Models: 300