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709-4PH SeeLeveL II™ Tank Monitor System


Product Overview

The 709-4PH tank monitor is designed for accurate level measurement of 5th wheel trailers with four holding tanks. This system monitors battery voltage, fresh, grey, galley and black water levels. The level in percent is shown on a three digit LED display. This model includes a single-pole pump switch, a single-pole heater switch and a heater pilot out light on the display panel.

System includes:  1 display monitor, 4 – 12″ 710ES tank senders and 1 pigtail.

Note:  The standard 12″ 710ES senders may be swapped out for either the 7” 710JS and/or 16” 710SS senders (710SS sender is an additional cost).  Select the checkbox above to configure this option.

  • Full featured system for either OEM or retrofit applications
  • Provides accurate tank level information using percentage of full readout
  • Tanks are monitored using Garnet’s proprietary external level sensing technology. This ends fouling problems caused by debris build-up in the holding tank.  Detailed diagnostic information monitors sender operation.
  • Measures tanks up to 12 inches tall with a single sender or 24 inches tall with dual senders.  The 710JS sender option gives improved accuracy for tanks from 5” to 7” tall.  The grey and galley tanks are limited to 12 inches tall.
  • Tank senders connect to display via a common bus which saves wiring costs
  • Uses common industry connector for ease of installation and servicing

Resolution:  3/8 inch (10 mm)

Accuracy:  +/- 8% or better, limited by resolution and tank shape

Operating temperature range:  +32 to +140 °F (0 to + 60 °C)

Sender materials:  0.008” thick glass epoxy circuit board with conformal coating for circuit protection.  Laminated on the back with 3M 300LSE Bonding Adhesive.

Sender length range:  4-1/2 to 12 inches, which will measure tank heights from 5” to 14” (single sender) and up to 26” (dual senders).

Display mounting panel:  Black flush mount panel, approximately 4” wide by 2.8” high by 1” deep (102mm wide X 71mm high X 25mm deep).  Panel screws to wall.  Required cutout size is 3” wide by 1.8” high.

System power requirements:  Display requires 12 volts from the RV battery, the system will function from 11 volts to 16 volts.  Current drain is less than 200mA.

Wiring:  A single two wire conductor required from the display to the senders. All the senders are wired in parallel. 12 V power and ground required for display. Single wire required for LPG sender if sender grounded at tank.

Pump & heater switches:  The pump and heater switch is rated for a maximum of 6 amps. A relay is required if more than 6 amps is needed. A 7.5 amp fuse is included.