AFRISO OSA 3 Manuale - Pagina 17
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OSA 3
Seperator alarm OSA 3 • Manual
Voltage measurements of the sensors
In the event of a fault occurring in any of
the sensor circuits an error message will be
displayed on OSA 3 indicating which
sensor output is detecting an error. The
output voltage to the sensor in question
can be measured in order to check what is
wrong.
Sensors are scanned in the following se-
quence, and sensors can only be checked
when the are active: Sensor 1 (layer sensor
ES4 ) active in 4 sec -> sensor 2 (thermis-
tor sensor R6-S) active in 45 sec -> sensor
3 (sludge sensor ES8) active in 4 sec. This
sequence is repeated continuously.
When the OSA 3 alarm unit is connected to
intrinsically safe circuits that enter an area
with a potentially explosive atmosphere,
extreme care should be taken when perfor-
ming fault diagnostics on a live alarm unit.
The only live parts in the unit that may be
touched (with a tool or instrument) are con-
nections on intrinsically safe terminal block
K3. Only measuring instruments that do not
have a detrimental effect on the intrinsi-
Table for check measurement of sensors
Sensor
1 Layer sensor
19 V
19 V
0.2 V
13.2 V
15.3 V
19 V
2 Damming sensor
0.2 V
7.5 - 12.3 V
14.2 - 16.5 V
3 Sludge sensor
19 V
19 V
0.2 V
13.1 V
15.3 V
When the sensor output is inactive, the voltage at the output is 0 volts.
AFRISO EMA AB • Kilvägen 2, 232 37 Arlöv • Sweden • Phone +46-(0)40-92 20 50 • [email protected] • www.afriso.se
Measurement
Sensor not connected or cable failure
Sensor is connected incorrectly
Sensor circuit short-circuited
Sensor in air or oil/grease (alarm status)
Sensor in water (normal operation)
Sensor not connected or cable failure
Sensor circuit short-circuited
Sensor in fluid (alarm status)
Sensor in air (normal operation)
Sensor not connected or cable failure
Sensor connected incorrectly
Sensor circuit short-circuited
Sensor in air or sludge (alarm status)
Sensor in water (normal operation)
cally safe characteristics may be used. EN
60079-17 must be adhered to during fault
diagnostics/maintenance.
Note: Measure the voltage and use a
multimeter showing decimals in order to
measure the difference in voltage.
The illustration below shows an example
for connection for troubleshooting of sen-
sor 1
Terminals 1, 2 and 3 and + feed to sensor
and Terminal G is the relevant output feed.
Error/status
Sensor outputs
Volts
Voltmeter
Action
Connect sensor/troubleshoot cable
Check polarisation
Check sensor circuit
Empty separator, or if sensor
Connect sensor/troubleshoot cable
Check sensor circuit
Empty/check separator
Connect sensor/troubleshoot cable
Check polarisation
Check sensor circuit
Empty/check separator
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