The Garnet 709-RVC SeeLevel II is designed for RVs equipped with RV-C compatible multiplex systems. In addition to providing accurate tank level readings on its built-in LED display, the 709-RVC broadcasts tank levels and alarm status to the RV-C CAN bus every 10-15 seconds. This allows systems like Silver Leaf, Firefly, and other RV-C compatible displays to show your tank levels alongside other coach systems.3 TanksRV-C NetworkAlarm OutputLPG
CAN bus integration
High/low tank alerts
Complete system control
0-100% accurate readouts
The RV-C (Recreation Vehicle Controller Area Network) is a standardized communication protocol used in many modern RVs to connect various systems. The 709-RVC connects to your RV's CAN bus and broadcasts tank levels continuously. Benefits of RV-C integration: • View tank levels on your existing Silver Leaf, Firefly, or other RV-C compatible touchscreen display • Tank data integrates with other coach systems for unified monitoring • Alarm status broadcast to network for system-wide alerts • Fresh, grey, black, and LPG levels all available on the RV-C bus • Display scans sensors every 10-15 seconds to keep RV-C data current Compatible with: Silver Leaf Electronics, Firefly Integrations, and other RV-C compliant systems.
The 709-RVC includes a common alarm output that can trigger external devices when tank levels reach programmed thresholds. This is incredibly useful for: • Black tank full warning: Prevent toilet use when tank is full (connect to indicator light or buzzer) • Fresh tank low warning: Alert when water supply is running low • Grey tank overflow prevention: Warn before grey water backs up into shower The alarm threshold is programmable from 0% to 99% for each tank, and you can set whether it triggers on high or low levels. The output provides a ground connection when active (max 100mA – use relay for higher current devices).
The 709-RVC is specifically designed for RVs with RV-C multiplex systems. If you don't have an RV-C network or don't need the alarm output, a standard model like the 709-P3W may be more cost-effective. Use our SeeLevel II Comparison Guide to compare all models.
Traditional RV tank monitors use probes that extend inside the tank. These probes quickly become coated with waste residue, toilet paper, and struvite buildup – causing the dreaded "always shows full" problem.
The SeeLevel II difference: Sensors mount externally on the tank wall using 3M adhesive. They measure tank levels through the plastic tank wall using capacitive sensing technology:
• Battery Voltage: Know when batteries need charging • Fresh Water Tank: Know exactly how much water remains • Grey Water Tank: Plan showers accordingly • Black Water Tank: Know exactly when to dump – no guessing • LPG/Propane: Monitor propane level via existing sender • Pump Switch: 3-way pump control built into display • Alarm Output: Programmable high/low level trigger
The 709-RVC connects to your RV's existing propane tank sender (the sensor built into your LP tank gauge). It does NOT include a propane sensor – it uses the one already installed in your RV.
Garnet offers three sensor sizes to match your tank heights. Sensors can be cut shorter or stacked for taller tanks:
Tip: The 710-ES3 (12") is the most popular choice. Do NOT mix sensor types when stacking.
Garnet offers several 709-RVC variants: • 709-RVC: 3 tanks + LPG + pump switch + alarm + RV-C (this model) • 709-RVC-NLP: 3 tanks + pump switch + alarm + RV-C (no LPG) • 709-RVC-PM: 3 tanks + pump switch + alarm + RV-C (no LPG, different pigtail) If you don't need RV-C network integration, consider the 709-P3W instead.
SeeLevel II sensors work on plastic/polyethylene and fiberglass tanks only. They will NOT work on metal tanks. Tank walls must be 3/8" (10mm) thick or less.
Installation of the 709-RVC is similar to other SeeLevel models, with the addition of RV-C network connection:
Complete installation instructions included. For detailed guidance, download the SeeLevel 709 Manual (PDF). Professional installation recommended, especially for RV-C network connections.
The SeeLevel II includes diagnostic capability that allows you to check the operating characteristics of each sensor. If a sensor develops a problem, the display can show you the signal level and help identify the issue.
Want a display in multiple locations? Add a 709-RVC Monitor Only to your system. When using dual displays, one must be set to "secondary mode" (alarms are inactive on secondary display).
→ View Complete SeeLevel II Comparison Guide
Manual: SeeLevel 709 Manual (PDF) Support: garnetinstruments.com/support Warranty: 1 Year Limited