Analog Outputs - Teledyne 7320 Operating Instructions Manual

Infrared Gas Analyzer
There are four DC output signal pins—two pins per output. For polar-
ity, see Figure 2-3. The outputs are:
0–1 V dc % of Range: Voltage rises linearly with increasing concentration,
0–1 V dc Range ID:
4–20 mA dc % Range: Current rises linearly with concentration, from 4
4–20 mA dc Range ID: 8 mA = Range 1, 12 mA = Range 2, 16 mA =
C u rre n t
O p tion a l
F lo a tin g
Inse rt w ire
h e re .
P ress h ere to
in se rt w ire .
R e le ase to h o ld.
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
2.3.3.1

Analog Outputs

from 0 V at 0 concentration to 1 V at full scale.
(Full scale = 100% of programmable range.)
0.25 V = Range 1, 0.5 V = Range 2, 0.75 V =
Range 3, 1 V = Cal Range.
mA at 0 concentration to 20 mA at full scale. (Full
scale = 100% of programmable range.)
Range 3, 20 mA = Range 4.
Figure 2-3: Analog Output Connections
C U R R EN T
+ +
4-20m A O /P 4-20m A O /P
% RANG E RANG E ID
Examples:
Teledyne Analytical Instruments
VO LTAG E
+ +
0-1 V O /P 0-1 V O /P
% RANG E RANG E ID
Installation 2
N eg ativ e
g ro u n d
2-5