User Manual SERVOPRO PLASMA Trace N
2
Analyzer
APPENDIX 2
64
DIGITAL OUTPUT / ALARM OUTPUT OPTION
The digital output permits the transmission of the range in use and, also, the transmission of the
analyzer status (internal alarms).
This is done by using four (4) dry contact outputs, labeled S1, S2, S3, ST. S1 is for 0-1 ppm, S2
is for 0-10 ppm and S3 for 0-100 ppm. The contact is closed to indicate the range in use.
The status (ST) contact output is always closed when the power is on, and no internal alarm is
active. The contact will open when a problem occurs in the analyzer (see user's manual for more
details), or if the power is off.
See attached drawing on the next page for the diagram of the digital output board. There is a
1 amp fuse on the digital board.
If you only have the standard digital output, there is no relay installed on the board for alarms or
auto calibration options. One side of each relay is connected to a terminal identified "C" on the
analyzer back panel terminal strip. The other side of the contact relays are labeled S1 (0-1 ppm),
S2 (0-10 ppm), S3 (0-100 ppm).
There are snubber circuits installed on the digital board to protect the contact of relays.
See drawings on the following pages for external wiring information.
The rating of the relays is: 30 Vrms, 42.4 V peak or 60 Vdc, 1 Amp maximum
To comply with immunity and emissions requirements of the European Community Directive on
EMC:
• The mains cable shall be unscreened.
• A multi-core cable with overall screen shall be used for connections to the relay output
terminals;
• A twin core cable with overall screen shall be used for connection to the mA output
terminals;
• The screens of the relay and mA output cables shall be connected to analyzer enclosure.
The remote end of screens shall be open circuit.
• All I/O cables and sample pipes are formed into a bundle and routed away from analyzer
enclosure.
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