Theory Of Operation; Resolution - Maretron CLM100 User Manual

4. Connect the CLM100 (Section 3.4)
5. Configure or Program Each Channel (Section 4.1)

1.6 Theory of Operation

The CLM100 operates by measuring the current transmitted by 4-20mA current loop
transducers. The current reading is translated to a parameter value according to the channel's
operating mode as well as the 4mA and 20mA parameter calibration values.
The CLM100 can be used with either 2-wire or 4-wire 4-20mA current loop transducers.
Standard NMEA 2000 messages are used for parameters wherever possible. Proprietary
messages are used for other parameters.
Parameter
DC Voltage
DC Current
Flow Rate
Distance
Linear Velocity
Linear Acceleration
Angle
Angular Velocity
Angular Acceleration
Temperature
Humidity
Resistance
Strain Gauge
Force (Load Cell)
Pressure
Decibels
Rotational Rate

1.7 Resolution

The CLM100 can measure parameters with a resolution of approximately 0.33% of full scale.
In many cases, the resolution to which the CLM100 can measure a parameter may be lower
than the resolution at which NMEA 2000 represents the parameter. As an example, if a
channel of the CLM100 is connected to a humidity sensor whose 4mA value corresponds to
0% relative humidity, and whose 20mA value corresponds to 100% relative humidity, the
CLM100 can measure and transmit humidity at a resolution of 0.33% relative humidity.
However, NMEA 2000 can represent humidity at a resolution of 0.004%. In this case, the
capabilities of the CLM100 is what limits the resolution of the parameter values that will be
transmitted over the network to 0.33%.
Revision 1.0
127751 DC Voltage/Current
127751 DC Voltage/Current
65286 Fluid Flow Rate (Maretron Proprietary)
130840 Generic Sensor (Maretron Proprietary)
130840 Generic Sensor (Maretron Proprietary)
130840 Generic Sensor (Maretron Proprietary)
130840 Generic Sensor (Maretron Proprietary)
130840 Generic Sensor (Maretron Proprietary)
130840 Generic Sensor (Maretron Proprietary)
130316 Temperature, Extended Range
130313 Humidity
130840 Generic Sensor (Maretron Proprietary)
130840 Generic Sensor (Maretron Proprietary)
130840 Generic Sensor (Maretron Proprietary)
130314 Actual Pressure
130840 Generic Sensor (Maretron Proprietary)
130840 Generic Sensor (Maretron Proprietary)
PGN
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