37
Start-up
Analogue signal
— A current between 4 and 20 mA flows through the transmitter during normal op-
eration. This current is proportional to the gas concentration.
— The Dräger Polytron 7000 transmitter uses various current values to indicate the
operational status of the transmitter:
Display
An alarm is triggered:
Current Meaning
4 mA Zero point
20 mA Full-scale value
<3.2 mA Transmitter fault
3.8 mA ... 4 mA Sensor drift below zero point
20 mA ... 20.5 mA Full-scale value exceeded
>23 mA Fault in analogue output
static signal: 3.4 mA
dynamic AC signal: 5 mA for
0.4 seconds
and 3 mA for 0.7 seconds
Maintenance signal and signal during the
warm-up period
(configured on delivery: static)
Every 10 seconds
1)
for 1 second
1)
<3.2 mA
1)
1)
Factory setting. Can be configured as desired, page 70.
Warning signal
(factory setting: off)
Caution:
Exceeding or falling below the transmitter supply voltage specified in the tech-
nical data can lead to an incorrect display of the analogue signal!
— In measuring mode, the display shows the actual gas concentration, e.g.:
— when rising above - for O
2
also when falling below - the alarm levels for the con-
centration alarm,
— When the full scale deflection is exceeded:
The special symbol »
Y Y Y Y « is displayed instead of the measurement value.
— The measured value drops below the measuring range:
The special symbol »
X X X X « is displayed instead of the measurement value.
A006_en.eps
O
2
Vol.%
20.9
A013_en.eps
O
2
A1
19.0
A007_en.eps
O
2
Vol.%
Y Y Y Y
A008_en.eps
O
2
Vol.%
X X X X
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