Teledyne 2000A-EU - General purpose thermal conductivity analyzer - Manual (Page 27)

Teledyne Analytical Instruments
Thermal Conductivity Analyzer Installation 3
3-5
Figure 3-4: Equipment Interface Connector Pin Arrangement
3.3.3.1 Analog Outputs
There are four DC output signal pins—two pins per output. For
polarity, see Table 3-1. The outputs are:
0–1 V dc % of Range: Voltage rises linearly with increasing concentra-
tion, from 0 V at 0 concentration to 1 V at full
scale. (Full scale = 100% of programmable range.)
0–1 V dc Range ID: 0.25 V = Range 1, 0.5 V = Range 2, 0.75 V =
Range 3, 1 V = Cal Range.
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 3-1: 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.