ALARM CONTACTS
4-20mA ANALOGUE OUTPUT
19
N Compact Nitrogen Gas Generator - User Guide. ©2020.
e generator is tted with a set of volt free relay contacts designed for connection to a remote alarm circuit. e contacts are rated 1A max @
250 Vac (1A @ 30Vdc). Under normal operation the relay is energised, when a fault occurs the relay will de-energise causing the relay contacts
to change state.
e oxygen content detected by the generators internal analyser may be re-transmitted to external peripherals using the 4-20mA linear
analogue output. e output is a linear current source, with 10 bit resolution, which increases from 4mA (Zero Oxygen) to 20mA (Full Scale
De ection). e FSD of the internal analyser is factory set to a default value of twice the generators speci ed purity. For % purity generators
the maximum FSD is set to 6%.
Note: e oxygen purity setting of the generator is marked on the rating plate.
e table below shows the correlation between the purity settings of the generator and the output current. e FSD can be altered in menu
3.9of the control software (refer to “Customer Settings ” on page 25 of this guide for details).
If the generator is connected to a remote alarm circuit, the electrical enclosure will contain more than one live circuit. In
the event of the generator electrical power supply being disconnected, the fault relay connections will remain live. It is
the users responsibility to provide a disconnection device so that these connections can be safely isolated.
Warning
GENERATOR PURITY
FULL SCALE DEFLECTION
RESOLUTION
4mA 20mA-
0 1ppm20ppm 0.8mA-=
-=
-=
-=
-=
-=
-=
-=
-=
-=
-=
0 0.01ppm1% 0.16mA
0 1ppm500ppm 0.032mA
0 0.01ppm4% 0.04mA
0 0.01ppm0.2% 0.8mA
0 0.01ppm6% 0.026mA
0 1ppm200ppm 0.08mA
0 0.01ppm2% 0.08mA
0 0.01ppm1000ppm 0.016mA
0 0.01ppm6% 0.026mA
0 0.01ppm6% 0.026mA
10ppm
0.5%
100ppm
1%
250ppm
2%
500ppm
3%
5%
0.1%
4%
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