Operator Manual
Page
17
of
40
P/N 1580281
SEC3120 Digital Transmitter
Sensor Electronics Corporation
Rev 10, 20150707
8.4.
Sensor Mode – Single, Unique or Identical
The SEC3120, unlike the SEC3100, communicates with two sensors allowing for simultaneous gas
measurement, display, transmission and storage. This capability opens up new opportunities for how
sensors can be configured to work together in varying roles. The following is a brief look at the three
configurations for the two sensor connectors:
Single Mode
– In this mode, the SEC3120 unit will only communicate / display / log information
from a single sensor connected to the sensor 1 connector (see Figure 1). Any device attached to
the sensor 2 connector is ignored. A key feature in this mode is when no sensor is attached to the
2nd connector t
he SEC3120 does not signal a ‘sensor missing’ fault. In this mode the display
mimics the behavior of the SEC3100, yet retains the advanced features of the SEC3120. The
Single Sensor Mode will default the Modbus Network ID mode
to ‘Single’ and change all screens
to disallow changing of sensor two parameters or displaying information for a second sensor.
CAUTION: Prior to setting the Sensor Mode to ‘SINGLE’ the relay logic should be configured
to only respond to sensor one or logic OR.
Identical Mode
– In this mode, the SEC3120 will require two sensors to be attached to the sensor
connector terminals. Both sensors must be of the same device type, measure identical gas types
and identical gas value ranges. The distinguishing feature of this mode is if one sensor is not
connected or if both sensors are not identical an error screen will be displayed, a UNIT FAULT will
be issued and the fault relay will be engaged.
This mode is commonly used for redundancy- such as two oxygen sensors used to ensure that the
actual oxygen levels are truly at the same appropriate value before triggering the associated
alarms. In this example the relay mode should be configured in the AND logical configuration for
this method to work as described.
Relay logic modes for Sensor 1, Sensor 2 or logic OR are not prevented in the Identical sensor
mode if the user would prefer to configure the relay mode as such. For example, if the user wants
added security one could choose logic OR, or if one sensor is faulty the relay mode may be set to
the other sensor until repair/replacement can occur.
Unique Mode
– In this mode, the SEC3120 will communicate with two sensors attached to the
sensor connector terminals. The two sensors can be of different sensor types, different gas types,
different concentration ranges or could be identical but in different locations. Modbus IDs may be
set to different values or to the same value (if not using an SEC3500 HMI). The relay mode may
be set to any configuration. This sensor role allows the SEC3120 to consolidate two sensors to
only one transmitter and allows logging of both sensor values to a single storage device. In this
mode the SEC3120 will indicate a fault/warning if one sensor is not attached. It will not indicate a
fault if the sensors are not identical.
The sensor mode in which the SEC3120 Digital Transmitter operates is chosen by the user and is a key
decision that must be made before deploying or changing the sensing/monitoring plan. The choice will be
determined by how many sensors are deployed, what gases are measured and how that data is captured.
Change Sensor Mode
Select ENTER to show the Initial/Top Menu Screen.
RESETTING LATCHED
RELAYS NOW …
S1 ID: XXX
(S1 GAS RANGE)
(S1 GAS TYPE)
(STATUS)
Содержание SEC 3000
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