Teledyne 7300A manual Pin Function, Examples, Output V dc Output mA dc

Infrared Gas Analyzer Installation 2

4–20 mA dc % Range: Current rises linearly with concentration, from 4 mA at 0 concentration to 20 mA at full scale. (Full scale = 100% of programmable range.)

4–20 mA dc Range ID: 8 mA = Range 1, 12 mA = Range 2, 16 mA = Range 3, 20 mA = Range 4.

Table 2-2: Analog Output Connections

Pin Function

3+ Range ID, 4-20 mA, floating

4– Range ID, 4-20 mA, floating

5+ % Range, 4-20 mA, floating

6– % Range, 4-20 mA, floating

8+ Range ID, 0-1 V dc

23– Range ID, 0-1 V dc, negative ground

24+ % Range, 0-1 V dc

7 – % Range, 0-1 V dc, negative ground

Examples:

The analog output signal has a voltage which depends on gas concen- tration relative to the full scale of the range. To relate the signal output to the actual concentration, it is necessary to know what range the instrument is currently on, especially when the analyzer is in the autoranging mode.

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 0–10 % carbon monoxide, then the output would be as shown in

Table 2-3.

Table 2-3: Analog Concentration Output—Example

Percent	Voltage Signal	Current Signal
CO	Output (V dc)	Output (mA dc)
0	0.0	4.0
1	0.1	5.6
2	0.2	7.2
3	0.3	8.8
4	0.4	10.4
5	0.5	12.0

Teledyne Analytical Instruments 2-5