OZONE ANALYZER BMT 965 Manual, Rev. 01/2024
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13
Input current at the binary input is approx. 8 mA. The input is protected against voltages with
wrong polarity.
Binary Outputs
The binary outputs are relay contacts, which are used to signal errors and alarms. An additional
contact can be used for the selection of purge gas during automatic zeroing. The common contact
of all binary output relays is on pin 8. The following outputs are available:
9 Lamp Low Opens when the lamp becomes too weak 32
12 High Alarm Opens or closes if concentration is above a certain threshold 24
13 Low Alarm Opens or closes if concentration is below a certain threshold 24
14 Cuvette Dirty Opens when a dirty cuvette is detected 33
2 Purge Contact for external pump / solenoid valve 15
The binary output contacts can switch a max. voltage of 28 V and a max. current of 0.5 A. The
binary outputs can be used as "high-side switches" (voltage applied to pin 8) or "low-side switches"
(pin 8 connected to ground). All outputs are protected by fast blow 1 A fuses. A blown fuse re-
quires the instrument to be sent in for service, so check your installation before operating your
system! Further explanations of the different output functions can be found on the pages men-
tioned.
Error Relay
The error output is an SPST relay contact. In order to prevent a broken wire from remaining
undetected, the contact has been designed as opening on error (normally closed closed if there
is no error), see page 32 for more details on error handling. The contact may be loaded
with 30 V/0.5 A.
In the warm-up phase and if the instrument is powered off, the error relay is in the error state.
Serial Interface (RS-232)
The bidirectional isolated serial interface is used for communication with a PC or other automation
components in an industrial environment.
Connection:
2 TxD Data sent
3 RxD Data received
5 GND RS-232 ground
Note: The RS-232 GND and isolated analog outputs GND are connected!
The data format used is eight bits, one stop bit, no parity (8N1). See page 25 for configuration of
the interface.
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