SeeLeveL Holding Tank Monitor Sender Manual
Models: 710-AR2 | 710-ES3 | 710-SS2
CANADA: Garnet Instruments Ltd. 286 Kaska Road Sherwood Park, AB T8A 4G7
USA: Garnet US Inc. 5360 Old Granbury Road Granbury, TX 76049
INTRODUCTION
SeeLeveL Senders are utilized with SeeLeveL Tank Monitoring systems, capable of monitoring up to seven tanks (2 Fresh, 3 Grey, 2 Black). These senders mount externally on holding tanks and can be stacked for taller tanks. Garnet offers three sender options based on tank height and desired resolution. They are compatible with most plastic or polyethylene holding tanks containing water-soluble fluids but not with metal holding tanks.
- 710-AR2: 9" high, 0.25" resolution. Ideal for low-profile tanks (3.5"-11" tall). Can be stacked for tanks up to 11".
- 710-ES3: 12" high, 0.33" resolution. Most popular option for standard holding tanks (4.5"-14" tall). Can be stacked for tanks up to 26".
- 710-SS2: 16" high, 0.44" resolution. Designed for taller tanks (7.5"-18" tall). Can be stacked for tanks up to 34".
Refer to page 3 for more information on sender lengths. The communication protocol between senders and displays is proprietary, ensuring system accuracy and reliable operation.
SAFETY SYMBOLS INFORMATION
- ? NOTE: Expands on information for any procedures.
- ⚠️ CAUTION: Explains safety information that could cause damage to the product, including data loss.
- ❗ WARNING: Explains dangers that might result in personal injury or death.
Changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment.
Document Version: 710-AR2-ES3-SS2 Manual_v1.5 - 01-Aug-2025
INSTALLATION INFORMATION
The complete system installation involves mounting the display inside the RV, cutting and mounting senders to tank sides, connecting wiring, and programming the display. This manual covers the installation of SeeLeveL 710-AR2, 710-ES3, and 710-SS2 senders.
? NOTE: Previous model senders (710-JS, 710-ES, 710-ES2, 710-SS) can be combined with new sender models.
The display unit should be installed before the senders. Refer to the Display Installation Guide and User Manual for detailed installation and connection instructions. All documentation is available in the Resource Library on the Garnet Instruments support page: https://www.garnetinstruments.com/support/
Tools and equipment required:
- Wire cutters/stripper
- Wire crimper
- Scissors or hole punch
- Acetone/rubbing alcohol
- Duct tape or tie-wraps for securing wires
- Non-aggressive tape (painters, masking)
- Electrical tape
- Butt connectors
DETERMINE BEST PLACEMENT & CONFIGURATION
Sender Placement
Senders require a flat area on the tank side, large enough for the sender's full width to contact the tank. Ensure metal components are at least 1" away from the sender's sides, top, and bottom, and at least 2" from the sender's face. Avoid wrapping senders over tank corners or rounded edges.
Text description of diagram: Two illustrations show correct and incorrect sender placement on a tank. Incorrect placement shows the sender bent over a rounded corner. Correct placement shows the sender flat against the tank wall.
⚠️ CAUTION: Bending the sender sharply will damage its internal circuit.
Sender Configuration
To determine the correct sender configuration, measure your tank height and identify the measurable space (see next page). The measurable space dictates the required sender length. If a sender is too long, it must be cut. The table below provides recommended sender options for various tank heights.
| Tank Height | Best Sender Option |
|---|---|
| 3.5" - 11" | 710-AR2 single |
| 11" - 14" | 710-ES3 single |
| 14" - 18" | 710-SS2 single |
| 18" - 20" | 710-AR2, stacked |
| 18" - 26" | 710-ES3, stacked |
| 26" - 34" | 710-SS2, stacked |
⚠️ CAUTION: DO NOT mix sender types when stacking senders.
DETERMINE MEASURABLE SPACE ON TANKS
Find Measurable Space
Measure the tank height from top to bottom to determine the measurable space. A minimum gap of 1/4" is required, but 1/2" from the top and bottom is recommended for optimal sender performance. This gap accounts for tank wall thickness variations at corners or rounded edges.
Subtract the gap space from the overall tank height to calculate the measurable space. The formula is: Tank height - top gap - bottom gap = measurable space.
Text description of diagram: A vertical representation of a tank showing 'Tank Height' and 'Measurable Space' between a 1/2" gap at the top and a 1/2" gap at the bottom.
? NOTE: While 1/2" is recommended, the minimum gap can be 1/4". The maximum gap is 3/4" for the 710-AR2 and 1" for the 710-ES3. See the recommended sender options table on page 2.
⚠️ CAUTION: Installing a sender outside the recommended measurable space may affect readings.
? NOTE: This formula may need adjustment. For some fresh tanks, the pump feed outlet may be above the tank bottom. Install the sender above this outlet to ensure the monitor reads "0" before the pump draws air.
Single configuration
- Measure the height of the tank.
- Tank height = __________
- Calculate the recommended measurable space: Tank height - top gap - bottom gap = measurable space. (Refer to gap recommendations.)
? NOTE: If senders don't fit the full tank height, optimize placement by positioning them closer to the top or bottom, depending on the liquid type. For FRESH tanks, position lower to avoid running dry. For GREY/BLACK tanks, position higher to avoid overflow.
Stacked configuration
For taller tanks, two senders may be required. A gap of 1/16" to 1/8" is needed between stacked senders. Calculate the total measurable space for both senders:
- Measure the height of the tank.
- Tank height = __________
- Calculate the recommended measurable space.
- Tank height - top gap - bottom gap - middle gap = measurable space. (Refer to gap recommendations.)
? NOTE: Both senders in a stacked configuration should be approximately the same length.
SENDER SPECIFICATIONS
Text description of diagrams: Three vertical diagrams illustrating the SeeLeveL senders. Each shows the sender's height, resolution, and wire connections (black ground wire, blue signal wire).
- 710-AR2 Sender: 9" height, 0.25" resolution, 2.20" width.
- 710-ES3 Sender: 12" height, 0.33" resolution, 2.20" width.
- 710-SS2 Sender: 16" height, 0.44" resolution, 2.20" width.
CUTTING SENDERS
Senders must be cut to match the tank's measurable space. Cuts should be made between the segmented pads. The minimum length is after the first three segmented pads. Use scissors to cut the sender.
Text description of diagram: A vertical representation of a sender showing cut lines between pads. Indicates '3 pad Minimum length' and 'Only cut between pads'. Shows scissors.
PROGRAMMING THE SENDERS
Senders are programmed by cutting tabs at the top of each sender to identify the tank it's mounted on or its position (top/bottom) in a stacked configuration. Scissors or a hole punch can be used.
For tanks 5 through 7, sum the numbers of two tabs for that tank number. This feature is available on display models supporting up to 7 tanks.
Refer to the table and illustrations for programming examples for each tank type.
| TANK TYPE | TABS TO CUT |
|---|---|
| FRESH | No tab cut |
| GREY | 2GRY |
| BLACK | 3BLK |
| FRESH 2 (TANK 4) | 4 |
| GREY 2 (TANK 5) | 2GRY + 3BLK |
| BLACK 2 (TANK 6) | 2GRY + 4 |
| GREY 3 (TANK 7) | 3BLK + 4 |
| GALLEY (for displays with GALLEY button) | 2GRY + TOP |
| TOP Sender | Cut "TOP" tab + tank type tab |
⚠️ CAUTION: MAKE SURE YOU CUT THE CORRECT TABS! Cutting the wrong tabs will result in incorrect programming, which cannot be reversed and is not covered under warranty.
For a double-stacked tank configuration, the top sender requires an additional tab to be cut.
Text description of diagrams: Illustrations show various tab cutting combinations for single and stacked senders, corresponding to tank types (FRESH, GREY, BLACK, GALLEY) and tank numbers (e.g., FRESH 2 (TANK 4)).
? NOTE: Previous model senders (710-JS, 710-ES, 710-ES2, 710-SS) are compatible.
? NOTE: For systems with a Galley button, cut the 2/GRY and TOP tabs. Galley and Grey tanks with a GALLEY button support only one sender per tank and cannot be stacked.
? NOTE: For tanks 5 through 7, use the sum of two tab numbers for that tank number on models that support up to 7 tanks.
For Tanks 4 - 7, also cut the TOP tab as indicated in the examples.
PREPARE SENDER FOR INSTALLATION
1 Clean the tank
Clean the mounting area thoroughly, ensuring it is free of dust, grease, and oil. Acetone or rubbing alcohol can remove sticky residue.
2 Temporarily tape sender on tank
⚠️ CAUTION: DO NOT SKIP THESE STEPS. Removing a sender after permanent installation will damage it and void the warranty.
After cutting and programming, temporarily tape the sender to the tank wall. Use tape along both sides of the sender and perform a test to verify operation.
⚠️ CAUTION: Route wires to the right, away from the senders. The wires indicate the top of the sender.
Use non-aggressive tape, such as painter's tape or masking tape.
Text description of diagram: A sender is shown taped to a tank wall with wires routed to the right. An illustration shows rolls of painter's tape and duct tape.
WIRING THE SENDER
3 Connect the wiring to the pigtail
The diagram shows wiring from the sender to the pigtail harness. Other wiring connections may apply per model; consult the website for all diagrams.
Text description of diagram: A wiring schematic shows multiple SeeLeveL senders connected to a pigtail harness. Connections are labeled for +12V POWER, GROUND, and TO PUMP INDICATOR. It indicates that up to 7 tanks can be connected and shows a stacked configuration.
Up to 7 tanks can be connected.
⚠️ CAUTION: Route wires to the RIGHT side of the sender, away from it. Never route wires to the left, as draping them over the sender can affect readings.
⚠️ CAUTION: It is crucial that the display and senders share the same ground. Connect the sender ground back to the display ground or breaker panel ground.
SENDER TEST
4 Verify operation before permanently adhering the sender to the tank.
Tank levels operation test
For the initial test, ensure the tank is at least 1/4 full of water or sewage. Verify that the percent level reading on the display panel is correct.
Example display reading: FRESH 25% LEVEL IN PERCENT
Signal strength test
Signal power indicates the strength of the signal transmitted through the tank wall to the receiver. Typical signal power should be 50% to 60%. The system can function with a minimum signal strength of 20%, but 50%-60% at installation allows for tank buildup. POO = 100%.
MOUNTING THE SENDER
5 Permanently adhere sender to the tank
Once operation is confirmed, permanently install the sender to the tank wall. Remove one side of the temporary tape. Fold the sender over, keeping it attached by the remaining tape. Slowly peel the backing paper off the adhesive.
⚠️ CAUTION: Be careful not to bend senders excessively, as this can damage circuits. You have one attempt. Peeling the sender off after it's stuck can damage it and void the warranty.
Carefully fold the sender back and press it firmly against the tank wall, ensuring full adhesive contact and no air gaps. Remove the other side of the temporary tape.
6 Secure the wires
Use duct tape, tie wraps, or similar materials to secure wires. This prevents them from rattling or pressing against the sender, which could cause damage or wire breakage over time.
Text description of illustration: Shows wires secured with tie wraps and duct tape.
7 Apply undercoating to the senders
For installations where the holding tank is exposed to road spray and debris, add protection. Recommended products include:
- Gorilla Glue Waterproof Patch & Seal Tape
- 3M 03584 Professional Grade Rubberized Undercoating
- Gravel Guard Rocker Guard Coating By Dominion Sure Seal
Support – Garnet Instruments
