Teledyne 7120 Operating Instructions Manual page 14

2 Installation
Insert wire
here.
Press here to
insert wire.
Release to hold.
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
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 % hydrogen, then the output would be as shown in Table 2-3.
Table 2-3: Analog Concentration Output—Example
Percent
CO
0
1
2-6
Current
Optional
CURRENT
+
Floating
4-20mA O/P
% RANGE
Voltage Signal
Output (V dc)
0.0
0.1
Teledyne Analytical Instruments
VOLTAGE
+ +
4-20mA O/P 0-1 V O/P
RANGE ID % RANGE
Current Signal
Output (mA dc)
4.0
5.6
Model 7120
+
Negative
ground
: s e l p m a x E
0-1 V O/P
RANGE ID