Teledyne BDS-3960 operating instructions Fixed Range Analysis, Signal Output

Oxygen Analyzer Maintenance

as 0–1000 ppb, range 3 cannot be set as 0– 500 ppb since it is lower than range 2.

Note: Refer to Section 4.3.2.2 to find maximum working range.

4.6.2Fixed Range Analysis

The autoranging mode of the instrument can be overridden, forcing the analyzer DC outputs to stay in a single predetermined range.

To switch from autoranging to fixed range analysis, click on the list box of the main screen, as shown on figure 4.3, then select on the range of interest.

4.8Signal Output

The standard Model BDS 3960 Oxygen Analyzer is equipped with two 0–1 VDC analog output terminals (one concentration and one range ID), and two isolated 4–20 mA DC current outputs (one concentration and one range ID) accessible from the 50-pin equipment interface connector located on the back panel.

See Rear Panel in Chapter 3, Installation, for illustration and pin configuration of the interface connector.

The signal output for concentration is linear over the currently selected analysis range. For example, if the analyzer is set on a range that was defined as 0–100 ppb O2, then the output would be as shown in Table 4-2.

Table 4-2: Linear Output for a 0-100 ppm O2 Range

	Voltage Signal	Current Signal
ppb O2	Output (VDC)	Output (mA DC)
0	0.0	4.0
10	0.1	5.6
20	0.2	7.2
30	0.3	8.8
40	0.4	10.4
50	0.5	12.0

Teledyne Analytical Instruments 55