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709-P3W SeeLeveL II Tank Monitor

Product Overview

The 709-P3W tank monitor is designed for motorhomes and travel trailers with three holding tanks; fresh, grey, and black tank levels.  This model also has a pump switch with a connector that allows for more wiring options, monitors battery voltage, as well, displays your existing propane (LPG) tank level by connecting to the sensor.

System includes  (1) display monitor, (3) tank senders, and (1) pigtail.

Note: For convenience, a second display console can be added to the system by installing it in the service bay area by the holding tanks. Select the “Display monitor only” to purchase.




Purchase at RVupgrades.com using the following links:


Purchase by calling our Canadian office at 1-800-617-7384 and select option 2.

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Precision accuracy – The SeeLeveL II ™ RV tank monitor provides percentage full, accurate tank measurement readouts. These readouts are accurate within 3/8 of an inch.

Simple to install – Two wires connect to your existing system wires and function on a common bus system. Accessible tanks are easy to retrofit.

Reliable external sensors – Our trouble-free senders adhere externally to the holding tanks eliminating sewage build-up on the sensors.

Customize to fit most tanks – The senders are designed to be easily shortened or two can be combined to accommodate almost any holding tank shape or size.  Note:  Will work on most plastic or poly holding tanks that contain any water-soluble products. Will not work on metal tanks.

Service and Warranty – Our professional and knowledgeable technicians are on-call to assist you with any problems you may encounter. Products offer a one-year limited warranty.

Resolution:  710JS sender: ¼” (6 mm), 710ES sender: ⅜” (10 mm), 710SS sender: ½” (13 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:  710JS sender: 4” to 6”, which will measure tank heights from 4 ½” to 7”. 710ES sender: 4 ½” to 12”, which will measure tank heights from 5” to 13” (single sender) and up to 25” (dual senders), 710SS sender: 6” to 16”, which will measure tank heights from 7” to 17” (single sender) and up to 34” (dual senders).

Display mounting panel:  Size: 4” wide by 2.8” high (102 mm wide X 71 mm high). Depth varies, 1” – 1 3/8” (25 – 35 mm), model dependent. Panel screws to wa­ll.

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. LPG wiring: A separate two-wire conductor required from the display to the LPG sender.

LPG:  Display will work with an LPG sensor with a maximum resistance of 50 ohms to 500 ohms. The display shows increasing level as resistance increases. The system must be calibrated with the LPG tank full.

Pump Switch:  The pump switch is rated for a maximum of 10 amps. The use of a relay is required if more than 10 amps are needed. A 10 amp (max) fuse must be installed in series with
the 12V power circuit to the switch!