BMT 932 - Emergency-Off Relays

OZONE MONITOR BMT 932 Manual, Rev. 02/2021
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CHANNEL ID relays may carry a max. current of 0.5 A at a voltage of 28 V (AC or DC). Cau-
tion: CHANNEL ID relays are protected by a 1 A fast-blow fuse at the Common contact, so
care should be taken not to overload these outputs. For the physical connection of the wires to
the spring cage contacts a screw driver 0.4 x 2.0mm is provided in the accessories.
11.4 Emergency-Off Relays
The OZONE MONITOR BMT 932 provides three logical EMO functions (Emergency Ma-
chine Off) for multi-channel operation. Hardware for each of these three EMO functions con-
sists of 2 independent relays. All 12 relay contacts (six relays with two contacts each) are available
at the terminal block named "EMO”. Two relays of each logical EMO function, which are driven
by separate software functions, can be connected in series in order to provide enhanced safety
against "hanging” relays.
Note: For single-channel operation use terminals 1 to 6 instead (connector "SIGNALS": High &
Low Alarm).
All concentration alarms (max.12) can be assigned to each of the three logical EMO functions. If
an alarm assigned to an EMO function becomes active (concentration is above threshold), the
corresponding two relays will open. Assignment of alarms to logical EMO functions can be done
on the front panel and with the software BMT 932 Link provided with the instrument. Max. cur-
rent is 1 A (AC or DC) at a voltage of 28 V.
Example: three generators with two sample points each have to be monitored by one OZONE
MONITOR BMT 932. In the event of an ozone leak in one generator only this generator shall be
switched off by the instrument. One logical EMO function is available for each generator, so the
four high and low alarms responsible for the two sample ports from each generator can be as-
signed to one logical EMO function individually, which means that an alarm on one generator
will not stop operation of the other two generators.
Signal Name Pin No. Description
G1R1a 1 EMO Group 1 Relay 1 Contact a
G1R1b 2 EMO Group 1 Relay 1 Contact b
G1R2a 3 EMO Group 1 Relay 2 Contact a
G1R2b 4 EMO Group 1 Relay 2 Contact b
G2R1a 5 EMO Group 2 Relay 1 Contact a
G2R1b 6 EMO Group 2 Relay 1 Contact b
G2R2a 7 EMO Group 2 Relay 2 Contact a
G2R2b 8 EMO Group 2 Relay 2 Contact b
G3R1a 9 EMO Group 3 Relay 1 Contact a
G3R1b 10 EMO Group 3 Relay 1 Contact b
G3R2a 11 EMO Group 3 Relay 2 Contact a
G3R2b 12 EMO Group 3 Relay 2 Contact b