Pipeline Watchdog RMU

The Pipeline Watchdog RMU is designed for true remote monitoring and data collection of cathodic protection rectifiers, critical bonds, and other devices and sensors used in the pipeline industry using GSM digital cellular or Inmarsat D+ satellite communications.

GSM digital cellular is recommended for most North American sites, while Skywave Inmarsat D+ works anywhere in the world and is recommended for the most remote sites. The system also works with other communications options, including ISM band radio and Modbus.

The Pipeline Watchdog RMU is designed to withstand the most severe CP rectifier environments. Surge leads are provided with each unit, and the unit physically disconnects itself from the structure via relays when not taking measurements. In addition, the units are self-powered with long-life batteries for further electrical isolation from the rectifier.

RMU Benefits

• Eliminates travel to sites to perform rectifier readings
• Reliably monitors CP rectifier operation - outage alarms sent by email and/or text message
• Website allows set up of automated rectifier data reports, in selectable file format for easy import into popular CPDM software (e.g. Bass-Trigon, ProActive, Paradigm, .XLS, .CSV, .XML, etc.)
• Low monthly messaging costs
• Expandable to monitor other pipeline assets and processes (valve position, pressure, flow, etc.)

RMU Technical Specifications

Physical:
• Includes NEMA-4X weather tight enclosure 11.5" high X 8" side x 2.5" deep 5 lbs (2.3 kg)
Operating Environment:
• Temperature: -40° to + 158° F (-40° to + 70° C)
• Humidity: 0 - 95%, non-condensing
Battery Power:
• 2 to 4 Lithium Thionyl chloride 'D' cells
Analog Inputs:
• Relay isolated, surge protected to 10 KV Standard input configuration (for CP rectifier):
  • Voltage Channel: 0 - 50 V or 0 - 200 V (selectable)
  • Amps Channel: -35 mV to + 50 mV or -70 mV to +100 mV (selectable)
  • Reference Cell Channel: 0 to 2 V or 0 to 5 V (selectable); 20 Mohm impedance
NOTE: Unit can be configured for critical bond: 1 Amps channel + 2 Reference cell channels
Measurement accuracy:
• +/- 1% of reading
Measurement resolution:
• 0.1% of full scale
Digital Input:
• AC Voltage detection probe input or switch/relay contact closure input
• Forward Channel reconfiguration (alarm points, reporting frequency) via Pipeline Watchdog Web Monitor
• Web Monitor transmits queued reconfiguration command upon reception of any report from the RMU
Communications:
• Skywave Inmarsat D+
  • geostationary satellite - clear view of southern sky required
• GSM Digital cellular using SMS
• ISM band radio modem (optional)
• Modbus RTU RS-232 serial (optional)

Ordering Information

Pipeline Watchdog RMU with Inmarsat D+ satellite:
• Rectifier configuration: 10-4400-RC
• Critical bond configuration: 10-4400-CB
Pipeline Watchdog RMU with GSM digital cellular:
• Rectifier configuration: 09-4400-RC
• Critical bond configuration: 09-4400-CB
AC Detection Probe:
• 01-3340-01

Product Model Numbers

Pipeline Watchdog RMU Features

• Rugged NEMA-4X enclosure
• 3 relay-isolated analog inputs - measure rectifier voltage, current, pipe-to-soil potential, as well as pressure transducers, temperature sensors, resistance probes, gas detectors, etc.
• Surge leads provided for each analog input
• Battery powered for maximum rectifier isolation and lightning protection. Batteries last 5+ years based on weekly reporting frequency
• AC power detection feature detects presence or absence of AC power to the rectifier
• GSM digital cellular or Skywave Inmarsat D+ communications for world-wide deployment