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Load inputs of the Relay go to the Alarm device e.g. siren, lights, etc.
- of the battery goes to – of OM-DAQLINK unit.
Note: Maximum load of the Relay is 50 mA, 3 V.
Refer to A ppendix A: OM-DAQLINK Specifications for the full external alarm output
specification.
4.3.6.
Polarity
Current, voltage, thermocouples and user defined sensors have distinct polarity. Be careful to
connect them in the right polarity.
4.3.7.
Frequency/Pulse Counter
Connect the signal wires to In-4 terminal blocks, and select Frequency or Pulse counter for
Input 4 from the logger Setup window in the DataSuite software. Inputs 1 to 3 are still available
for other sensors.
The Frequency/Pulse counter is optically isolated from the internal circuitry and can
simultaneously measure a signal source, together with another input.
4.3.8.
User Defined Sensors
OM-DAQLINK provides a simple and straightforward tool for defining a limited number of
custom sensors. Almost any sensor or transducer with 0 – 1 V or 4 – 20 mA output is accepted
by the OM-DAQLINK logger and its electrical units are automatically scaled to meaningful user-
defined engineering units.
The sensor definitions are stored in the logger's memory and are added to the sensors list. The
sensor's readings are displayed in the user defined units only in the DataSuite software. Future
versions will also support displaying the user defined engineering units on the logger LCD.
Refer to section 5 .6.1 for more details.
4.3.9.
Sensor Alarms
Via the software, users can define minimum and maximum alarm levels for each input
individually. Users can define pre-low and pre-high alarm levels, for an additional level of safety
in case the logger is approaching an actual breach of alarm.
The OM-DAQLINK logger display indicates when the sensor reading is in alarm of any type. The
symbols AL-H, AL-L, AL-P-H or AL-P-L are visible next to the corresponding input readings.
Refer to section 5 .16 for more details.
4.3.10. Sensor Calibration
The OM-DAQLINK data logger is shipped fully calibrated. However, further calibration can be
applied via the DataSuite software. The calibration parameters are sent to the data loggers via
USB connection and stored in the logger's memory.
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