Instruction 5700-9001
GDA-1600 16-Channel Controller
17
3.2.4.2 Marker Menus
Some transmitters/monitoring devices providing GDA-1600 inputs also indicate special
modes of operation (such as
Calibration,
Maintenance or Fault
) by transmitting a special
<4mA or negative “Marker” value. The GDA-1600 offers channel Marker menus for
detecting and indicating such events (see Figure 3.5). While active, the GDA-1600
displays a 6-digit ASCII message to indicate the special event and if equipped with the
4-20mA output option (P/N 5700-0005), the GDA-1600 also transmits the same <4mA
value.
Figure 3.5
– Marker Menus
Entries
Description
Marker Enabled
Marker Enabled
turns the marker feature ON and OFF
Marker %
The negative Marker value is entered into the
Marker %
field as a negative percent
of the full scale. For example, -15.62% of full scale detects a marker value of 1.5mA
(1.5mA is -15.62% of full scale when 4-20mA is the range).
Mark As
The
Mark As
menu allows user entry of the 6-digit ASCII message to be displayed
when the marker is detected.
3.2.4.3 Sensor Life Detection
Sensor Life
should only be activated when the Marker event is
Calibration
and when a
sensor life value is transmitted after each calibration.
NOTE:
This feature is provided primarily for use when interfacing with the GDA-1600
to Bacharach’s GDX-350 Sensor Transmitters which may be configured to
transmit sensor life values after each calibration (see Figure 3.6).
Entries
Description
Sensor Life
For
Sensor Life
to record properly, the monitor must perform as follows: After the
Calibration
Marker interval, 4.0mA transmits for 10 seconds to indicate its
calibration mode
is complete. The monitor then transmits between 4.0mA and
5.0mA for five seconds depending on remaining sensor life, where 4.0mA = 0% and
5.0mA = 100% remaining sensor life. The GDA-1600 reads this value and records it
as the channel’s
Sensor Life
.
Sensor Life
is stored in the GDA-1600 Modbus
database and displayed as a bar-graph in the Sensor Info screen (see section 3.3.6
on page 25). It is a useful tool for planning sensor replacement schedules.
Reset Sen. Life
Summary of Contents for GDA-1600
Page 21: ...Instruction 5700 9001 GDA 1600 16 Channel Controller 21 Figure 3 10 Configuration Menus ...
Page 28: ...GDA 1600 16 Channel Controller Instruction 5700 9001 28 Figure 4 2 Main PCB ...
Page 36: ...GDA 1600 16 Channel Controller Instruction 5700 9001 36 Figure 4 7 Analog Output Board ...
Page 38: ...GDA 1600 16 Channel Controller Instruction 5700 9001 38 Figure 5 2 System Diagnostic Options ...
Page 53: ...Instruction 5700 9001 GDA 1600 16 Channel Controller 53 ...
