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CLM100

Current Loop Monitor

Maretron’s CLM100 converts commercially available 4-20mA current loop transducers into digital data so a wide variety of information can be displayed on compatible NMEA 2000® displays. Numerous 4-20mA current loop transducers are supported by the CLM100 including transducers for monitoring DC voltage and current, flow rate, distance, linear velocity and acceleration, angle, angular velocity and acceleration, temperature, humidity, resistance, strain gauges, force (load cells), pressure, decibels, and rotational rate. Some typical applications where the CLM100 is used together with a commercial available 4-20mA transducers include machinery monitoring using accelerometers and vibration sensors. Vibration monitoring of pumps, motors, fans, compressors, and gear boxes provides an early warning of potential problems resulting fewer breakdowns and reduced maintenance expenses.

Another application example using the CLM100 is shaft speed monitoring. A commercially available 4-20mA rotational rate sensor is coupled to the shaft of interest and the CLM100 converts the transducer data to an RPM that can be read by a compatible NMEA 2000® display. And if you’re concerned about the force exerted on a mast stay or perhaps a vessel tow attachment point, commercially available clevis pins with a 4-20mA interface can be connected to the CLM100 and the corresponding load monitored using any of Maretron’s display products.

The CLM100 is NMEA 2000® certified so you can view any and all information anywhere on the vessel using a compatible NMEA 2000® display. The CLM100 is a key component of Maretron's N2KView® vessel monitoring and control system.

  • Six Channels
  • Each channel independently programmed
  • Used Together with Commercially Available 4-20mA Current Loop Transducers
  • Converts Analog Transducer Data to Digital Data (NMEA 2000®)
  • Digital Data Displayed on All Maretron Displays
  • Voltage Measurement
  • Current Measurement
  • Distance Measurement
  • Linear Velocity Measurement
  • Linear Acceleration Measurement
  • Angle Measurement
  • Angular Velocity Measurement
  • Angular Acceleration Measurement
  • Flow Rate Measurement
  • Temperature Measurement
  • Humidity Measurement
  • Resistance Measurement
  • Strain Gauge Measurement
  • Force Measurement
  • Pressure Measurement
  • Decibel Measurement
  • Rotational Rate Measurement

The following accessories are available for the CLM100 for channels configured to measure pressure:

Pressure Transducer 0 to 1.5 PSI

Part Number: PT-0-1.5PSI-01

Pressure Transducer 0 to 3 PSI

Part Number: PT-0-3PSI-01

Pressure Transducer 0 to 5 PSI

Part Number: PT-0-5PSI-01

Pressure Transducer 0 to 10 PSI

Part Number: PT-0-10PSI-01

Pressure Transducer 0 to 50 PSI

Part Number: PT-0-50PSI-01

Pressure Transducer 0 to 100 PSI

Part Number: PT-0-100PSI-01

Discontinued
Pressure Transducer 0 to 300 PSI

Part Number: PT-0-300PSI-01

Pressure Transducer 0 to 500 PSI

Part Number: PT-0-500PSI-01

Pressure Transducer 0 to 1000 PSI

Part Number: PT-0-1000PSI-01

Discontinued
Pressure Transducer 0 to 3000 PSI

Part Number: PT-0-3000PSI-01

Pressure Transducer 0 to 5000 PSI

Part Number: PT-0-5000PSI-01

Pressure Snubber

Part Number: PT-SNUB-01

Pressure Transducer Vacuum 0 to 1 Bar

Part Number: PT-V-0-1BAR-01

Indoor Humidity/Temperature Sensor

Part Number: IRHT-01

Note: Maretron monitoring sensors are updated using Maretron’s N2KAnalyzer application on a PC paired with an approved NMEA 2000® gateway.

1.2.2.4 (2021-04-21) – Current Release
  • Support Generic Sensor Device
  • Support Standard N2K Label PGN: 130060
1.2.1.1 (2020-08-14)
  • Support Engine PGNs (CLM100 device will act as one engine node) (Bug # 4027, 4594, 4603, 4619, 4645)
  • Support Transmission PGNs (CLM100 device will act as one transmission node)
  • Support Battery PGNs (CLM100 device will act as one battery node)
  • Support Vessel PGN: 130576, Trim Tab Status (Bug #4027)
  • Support DF108 (Power Extended Range (W), int32) (Bug #4619)
  • Support DF68 (Power, Low (mW), uint16) (Bug #4619)
  • Support "Percent Engine Torque" (Bug #4619)
  • Re-transmit label PGN when channel configuration change (CLM100 will monitor the change(s) every 1s to reduce the repeated label PGNs transmitted) (Bug #4181)
  • Enable 4-20 mA support in 130840
1.1.1.1 (2016-07-07)
  • Reduce ADC error by changing ADC calibration data for current monitoring to be 6 channels instead of 4 channels (for ADC OS because of hardware limit, copy OS[0] to OS[4] and OS[1] to OS[5].) (Bug #3973)
  • Remove 130840 from N2K TX List when the channel was disabled (Bug #3727)
1.0.3.1 (2016-02-19)
  • Correct function: n2k_tx_clm_gen_ss_rq and n2k_tx_clm_gen_ss (called by “tx gen” test mode command and MT_CMD_RET_GEN_SS Maretron N2K command) to temporary transmit sensor measuring data (I or V) and continue sending for 3 more seconds at 200ms interval. (3772)
  • Add support for Maretron N2K command MT_CMD_RET_DATA_I (0x36), similar to FPM100 (3773)
1.0.2.3 (2016-01-11)
  • Correct “no damp” test mode command to temporary change damping and transmission interval.
1.0.2.1 (2015-10-21)
  • Support Instance Setting by Channel Correlation Protocol
1.0.1.6 (2015-10-06)
  • Limit internal measuring current level to 2mA-22mA (report NA when out-of-range)(similar to FPM100)
  • Hold reported data at 4mA and 20mA (report 4mA when <=4mA, report 20mA when >=20mA)(similar to FPM100)
1.0.1.5 (2015-10-05)
  • Add test mode command “no damp”
1.0.1.4 (2015-09-30)
  • Correctly respond to N2K command on un-supported PGN
1.0.1.3 (2015-09-21)
  • Initial Public Release
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