Garnet SEELEVEL II 714 User manual

INSTRUMENTS LTD.INSTRUMENTS LTD.
Printed in Canada
TM
SEELEVEL II
Tank Monitor
MANUAL
IMPORTANT OPERATOR INFORMATION
DATE INSTALLED:_____________________________________________________________
Signal Level Sender Height
Black Water Tank
Grey Water Tank
Fresh Water Tank
714 714-P

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Table of Contents
CHAPTER 1 - OVERVIEW.............................................................................................3
CHAPTER 2 - SYSTEM DESCRIPTION .....................................................................4
CHAPTER 3 - OPERATING INSTRUCTIONS ..........................................................5
CHAPTER 4 - DISPLAY CALIBRATION.....................................................................6
CHAPTER 5 - SENDER PROGRAMMING ...............................................................9
CHAPTER 6 - INSTALLATION GUIDE..................................................................... 12
(NEW OEM INSTALLATIONS ONLY)...................................................................... 12
CHAPTER 7 - TROUBLESHOOTING GUIDE......................................................... 18
CHAPTER 8 - SERVICE AND WARRANTY INFORMATION ............................ 21
CHAPTER 9 - SPECIFICATIONS ............................................................................... 22
GARNET
SEELEVEL II
TM
Tank Monitor
MODEL 714 / 714-PH
714-714P Manual_v 3.1 - 22-Aug-14

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The SEELEVEL II TM Tank Monitor represents a massive leap forward in level measurement technology for the Recreational
Vehicle industry. The SEELEVEL has a combination of features,
accuracy, reliability, and diagnostic capability that have never been
available before.
The 714 will monitor the battery voltage, the water and sewer holding
tanks, the temperature and the LP Gas tank. The information is
displayed on 5 - three digit alpha-numeric LED displays. In addition,
the system can display the operating characteristics of each of the
tank sending units, giving it unsurpassed diagnostic capability.
CHAPTER 1 - OVERVIEW

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The SEELEVEL consists of a display unit that mounts inside the RV, and sender panels that stick to the side of the holding tank. A
single two conductor wire is used to connect all the sender panels
to the display.
The Sender: Each sender panel is a exible self adhesive printed
circuit board which is adhered to the side of the holding tank. The
sender panel can be cut to length to match the height of the tank, and
it auto calibrates itself so that it can read from Empty to Full regardless
of the height of the tank. The sender scans the water level through
the tank wall using advanced digital techniques programmed into
the sender microprocessor. When the sender transmits the water
or sewer level information to the display, it sends a digital code that
has built in error detection, making it highly unlikely for the display
to read an incorrect level, even if the wiring is marginal. In addition
to the level, the sender also transmits diagnostic information about
its operation. This information can be used to determine if there is
buildup of sludge on the inside of the tank, or to determine if the
sender is damaged or delaminating from the side of the tank. If
sludge buildup in the tank becomes extreme the gauge will cease to
operate (the tank will always read empty), so by monitoring the signal
power the tank can be cleaned before the buildup gets excessive. If
the tank is more than 12 inches tall, two senders can be stacked to
allow measurement of levels up to 24 inches.
The Display: The display continuously shows the levels for the fresh,
grey, and black tanks, outside temperature and battery voltage or
LPG level. The display automatically obtains the level or temperature
information every 10 seconds and updates the display accordingly.
The display receives the information from the three sender panels
via a single two conductor wire. If the wiring is disconnected or cut,
or if the sender panel is damaged, then the display will indicate the
appropriate fault condition.
The outside temperature is measured with a digital temperature
sensor mounted on the outside of the coach. The temperature can
be programmed to read in degrees Celsius or Fahrenheit and is
accurate to within 3 °F (1.5 °C).
With these diagnostic features and the digital nature of the tank level
sensing technology, it is almost impossible for the system to indicate
an incorrect water level, and in the very unlikely event it does occur,
servicing is greatly aided with the diagnostic information.
User operation of the display is described in the next chapter.
CHAPTER 2 - SYSTEM DESCRIPTION

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CHAPTER 3 - OPERATING INSTRUCTIONS
The display is the only system component that is accessed by the user. Operation of the display is as follows:
To read a tank level:
The levels in percent are continuously shown on the LED displays,
and are updated every 10 seconds. If more frequent updates are
required (~2 seconds) while loading or unloading a tank, the tank
can be put into hold mode by pressing the button for that tank. A
display in hold mode is shown by the decimal in the bottom right
corner of the readout. Hold mode for a tank is only available on
the primary display.
To read the outside temperature:
The temperature in degrees is continuously shown on the LED
display, and is updated every 10 seconds. If there are 2 temperature
senders installed, then pressing the button to the right of the
temperature display will toggle between the two temperatures.
The second temperature will be indicated by a decimal point on
the right. The temperature can be programmed to be in either
degrees Celsius or Fahrenheit. Refer to the programming section
to obtain instructions on how to set this.
To read the battery voltage or LPG:
The fth display can be toggled between battery voltage and LPG
tank level. The bottom button can be pressed to change between
battery voltage and LPG level. Battery voltage will be shown with
a decimal point and LPG level will not.

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CHAPTER 4 - DISPLAY CALIBRATION
To display code revision number and display primary/
secondary status, and for setting display options:
1. Press and hold the bottom button and then the top button.
2. The display will show “COd rEL 3.11 Pri/SEC Scn”. This shows
the code release as 3.10 and whether the display is set as
primary or secondary.
3. If the buttons are held down for ~5 seconds, the display
shows “SEt dIS PLY OPt ion”, release both buttons.
4. The display will show “tE1 tE2 LPG bAt dun”. This represents
the options temperature 1, temperature 2, LPG, battery
voltage and done. If an option is not currently turned on it
will not show.
5. Press the button next to each option to toggle it on and off.
When the option is off it disappears.
6. When the correct conguration is displayed press the button
next to “dun” to store and exit.
To calibrate the temperature readouts to degrees F or
degrees C:
1. Press and hold the bottom button and then the third button.
2. The display will show either “Set TEP F-C t-C dun” or “Set TEP
F-C t-F dun” depending on whether degrees F or C is currently
shown. When this occurs release the buttons.
3. To alternate between Fahrenheit and Celsius, press any of the
top four buttons, each time a button is pressed the display will
switch to the other temperature.
4. When the display shows the correct temperature mode, press
the bottom button, “Sto” will be displayed to indicate that the
temperature unit has been stored.
To calibrate the display as primary or secondary:
1. This should only be done at the time of installation. This only
needs to be calibrated if there are two displays connected to
the senders.
2. With no power to the display, hold down the bottom and
second buttons. Reconnect power, the display will show “SEt
Pri or SEC Scn.” After holding the button for about 5 seconds
the display will show either “Pri Scn dun” or “Sec Scn dun”.
When this occurs release both buttons.

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3. Press the top “TOP” button to toggle between primary and
secondary scanning mode. The bottom button will store and
exit the menu, all the displays will show “Sto” until the button
is released. Normal operation will then start.
4. The LPG must be wired to the primary display only.
5. If the primary display malfunctions the secondary display will
automatically take over the functions of the primary.
To calibrate the number of senders for each tank:
1. This should only be done at the time of installation, there is
no reason to change this afterward. Hold down the button
beside the applicable tank label (FRESH, GREY, or BLACK). The
display will show “HLd, then “dIA”, then “AnA, and then “FrS/
GrS/bLS” for Fresh/Grey/Black number of senders. This will
take about 15 seconds. When this occurs release the button.
2. The display will now show “1SE/2SE” (one/two senders) These
are the only two options, the display will not work with more
than two senders per tank. The bottom display will show
“dun”.
3. To change the number of senders, press the tank button, each
time the button is pressed the display will store the value.
4. When the display shows the correct number of senders,
press the bottom button, this exits the menu and resumes
scanning with that tank. Each tank will need to be calibrated
individually using this procedure.
To program the LED brightness:
1. If the display is to be used inside the coach, the LED brightness
should be low. If it is to be used in the service bay area where
sunlight can reach it, the LED brightness should be high.
2. Press and hold the bottom button and then the second button,
release buttons when display shows “Set bri UP dn dun”.
3. The third button (UP) increases the brightness and the fourth
button (dn) decreases the brightness.
4. The current brightness level (“b-1”, “b-2”, “b-3”, or “b-4”)
will be shown while the UP or dn buttons are held, where
“b-1” is the minimum brightness and “b-4” is the maximum
brightness.
5. When the display shows the correct brightness, press the
bottom button to save the brightness level. When the bottom
button is pressed all the displays show “Sto” to indicate the
brightness level has been stored.

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To calibrate the LPG sender:
1. The LPG tank must be full when the sender is calibrated,
otherwise the calibration will be invalid. Fill the LPG tank by
using an alternate measurement method, such as weight, a
spit valve, or a mechanical gauge on the tank.
2. To calibrate, press and hold down the bottom button and
then the fourth button, the display will show “CAL LPG HLd
5 SEC” and counts down seconds for as long as the buttons
are held.
3. After holding the buttons for ve seconds, the display shows
“Let Go to CAL”
4. When this occurs release both buttons, the LPG display is
now calibrated to 100% the other displays will show “Sto”.
Calibration is complete and normal operation resumes.
5. The LPG can be recalibrated as many times as desired,
although recalibration should not be needed unless the LPG
tank sender or the display has been replaced.

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CHAPTER 5 - SENDER PROGRAMMING
To program the sender for the correct tank:
1. Since the senders are all connected in parallel to save wiring
and to simplify installation, the senders must be programmed
so they know which tank they are on. The senders can be
programmed for either the fresh, grey, or black tank. This is
done with the two tabs on the top corners of the sender. See
the following diagram.
2. The senders default to fresh tank operation if the programming
is not altered. Consequently, if the sender is for the fresh tank,
nothing further needs to be done to it.
3. If the sender is for the grey tank, remove the tab that says
“GRY” next to it.
4. If the sender is for the black tank, remove the tab that says
“BLK” next to it.
5. This is all that is required to program the senders for the
correct tank. However, if you make an error, you have one
chance to correct it, as described below.
6. If the “GRY” tab has been removed and it should be a black
tank sender, or if the “BLK” tab has been removed and it
should be a grey tank sender, then cut out the recessed grey-
black correction tab that says “GBC” next to it. This reverses
the effect of the grey and black tabs.
7. If either the “GRY” or “BLK” tabs have been removed and it
should be for a fresh tank, then remove the other “GRY” or
“BLK” tab. When both the “GRY” and “BLK” tabs are removed,
it is equivalent to neither of them being removed.
8. If the sender is single, no further programming is required.
9. If dual stacked senders are used, the top sender must have
additional programming, as described below.
To program the sender as top or bottom:
1. Since the senders are all connected in parallel to save wiring
and to simplify installation, the senders must be programmed
so they know whether they are a single, top, or bottom sender.
This is done with the tab at the top center of the sender. See
the following diagram.

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2. The senders default to single or bottom operation if the
programming is not altered. Consequently, if the sender is for
single or bottom operation, nothing further needs to be done
to it (beyond programming it for the correct tank).
3. For a top sender, remove the tab that says “TOP” next to it.
4. This is all that is required to program the senders for single,
top, or bottom use. However, if you make an error, you have
one chance to correct it, as described below.
5. If the “TOP” tab has been removed and it should be a single
or bottom sender, then cut out the recessed top correction
tab that says “TC” next to it. This reverses the effect of the
top tab.
6. Verify that both the top and bottom senders have been
programmed for the correct tank.

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CHAPTER 6 - INSTALLATION GUIDE
1. The installation consists of mounting the display inside the RV,
cutting and fastening the senders to the sides of the holding
tanks, connecting wiring, and programming the display.
2. Mount the display by cutting a hole in the wall 2 1/4” wide by
4 3/4” high and bringing the wiring out through the hole to
connect to the display panel connector.
3. Connect the wiring according to the following table. It is easier
to connect the wiring to the display connector rst, and then
plug the connector into the display panel. The sender needs
to be grounded to a single ground wire from the display.
Wire Color Function
Green 22 gauge LPG sensor
Blue 22 gauge Tank Senders
Black 18 gauge Ground
Red 18 gauge +12V power input to monitor
Green/Yellow 22 gauge Pump switch - normally open
White/Orange 22 gauge Pump switch - common
White/Blue 22 gauge Pump switch - normally closed
Yellow 22 gauge Pump LED
4. Determine where to mount the senders on the tanks. They
will need to have a at area on the side of the tank large
enough so the whole width of the sender is in contact with
the side of the tank, all the way from the top to the bottom
of the tank. Make sure that any metal is at least an inch away
from the sender. Clean the area well so that there is no dust,
grease, oil, water, etc., that would prevent the adhesive on the
sender from sticking.
5. Measure the height of the tank to determine how long the
senders should be. For tanks less than 13” tall, follow step 6.
For tanks greater than 13” tall, follow step 7.
6. For tanks less than 13” tall, a single sender is used. The
sender ends should be 1/4” to 3/4” away from the top and
bottom of the tank, to allow for the thickness of the tank top
and bottom and any bows in them (see the diagrams). The
(NEW OEM INSTALLATIONS ONLY)

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senders are calibrated to account for this distance from the
bottom of the tank. The sender is cut to the nearest even 1.5
inch in length, for example, a system with a tank height of
11.75 inches, cut the sender to be 10.5 inches long, this allows
5/8” at each end when the sender is centered vertically on the
tank. IMPORTANT: Do not cut the sender shorter than
4-1/2 inches! The sender will not work if it is cut less than
4-1/2 inches.
7. For tanks greater than 13” tall, two stacked senders are used.
The sender ends should be 1/4” to 3/4” away from the top
and bottom of the tank, to allow for the thickness of the tank
top and bottom and any bows in them (see the diagrams).
The senders are calibrated to account for this distance from
the bottom of the tank. In addition, there needs to be a gap
of 1/16” to 1/8” to between the two senders. Therefore total
length of both senders will be: tank height -1/4”-1/4”-1/8”,
then rounded down to the nearest 1.5 inches. The top and
bottom senders should be approximately the same length for
best results. For example, if the tank height is 22”, then 22”-
1/4”-1/4”-1/8”=21 3/8”, so the total length of both senders
will be 21 inches. Make both senders 10.5” long.
8. To make the senders the right length (assuming they are too
long) they will need to cut off with a pair of scissors. The end
to be cut is the bottom end, which is the opposite end from
the top where the wires come out (see the diagrams). DO
NOT cut the sides, and DO NOT cut the sender shorter than
4-1/2 inches. The cut must be in between the sensor pads,
and the cut must be made parallel to the existing bottom
end. Double check your measurements, if the sender is cut
too short, it cannot be lengthened.

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9. The senders need to be programmed so they know which tank
they are on. This is done by selectively cutting off the tabs
on the top of the sender. See the chapter entitled “SENDER
PROGRAMMING” and the section “To program the sender
for the correct tank” for details.
10. For two stacked sender systems, the senders need to be
programmed so they know that they are being used as
top or bottom senders. See the chapter entitled “SENDER
PROGRAMMING” and the section “To program the sender as
top or bottom” for details.
11. Once the sender is cut to length and programmed, carefully
peel the backing paper off the adhesive. Do this slowly to
prevent the adhesive from being ripped off the sender, and
to prevent the backing paper from ripping. Be careful not to
bend the sender sharply in the process. Position the sender
over the side of the tank and carefully stick it down. MAKE
SURE THAT THE END WITH WIRES IS POINTING UP!! Position
the bottom of the sender at least 1/4” above the bottom of
the tank, and more if required to equalize the space at the top
and bottom of the tank. Make sure that the sender is square
with the tank. You only have one shot at this, if you try to peel
it off the tank once it is stuck the sender may be damaged by
the sharp bending. Carefully press the sender down to the
tank so that all of the adhesive is contacting the tank wall.
12. Connect all the blue wires from the senders together, and to
the blue wire from the display. Connect the black wire from
each sender to ground. Use Marrette or crimp connectors to
fasten the wires together. Make sure that the wires from the
sender are routed away from the sender, if they drape over
the sender they could affect the reading. Secure the wires
with tie wraps or something similar so that the wires do not
rattle or press against the sender, this may result in sender
damage or wires breaking over time.
13. Do steps 4 to 12 for the other two holding tanks.
14. All that remains now is calibration and testing. The tank
senders will self calibrate to whatever length they are cut, so
they will always read from 0 to 100%. The display needs to
be set to a one or two sender system for each tank. See the
chapter entitled “DISPLAY CALIBRATION” and the section
“To calibrate the number of senders for each tank” for details.
Make sure you do it for each tank.
15. For the initial test, have the tank at least 1/4 full of water or
sewage, and verify that the percent level reading looks correct
(see the chapter entitled “OPERATING INSTRUCTIONS” and
the section “To read a water or sewer tank level” for details).
Check to see that the signal power is at least 12% (see the

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chapter entitled “TROUBLESHOOTING GUIDE” and the
section “To review the sender diagnostics” for details). If the
signal power is too low, make sure that the sender(s) is well
stuck to the side of the tank and that the tank is reasonably
clean inside, as a large buildup will reduce signal strength.
The gauge will work with maximum signal strengths as low as
5%, but it is good to have at least 12% at installation so that
there is some margin available for buildup in the tank. Note
that the system “learns” about the characteristics of the tank
with use, so the readings may be inaccurate when the tank is
empty or almost empty when the system is rst tested. Once
the tank has been lled at least 1/4 full the system will be
properly “taught” and should read correctly after that.
16. Calibrate the LPG by lling the tank and following the
instructions in the chapter entitled “DISPLAY CALIBRATION”
and the section “To calibrate the LPG sender”.
17. Connect the pump and heater switches as required.
WARNING: The pump and heater switches are rated for a
maximum of 6 amps. The use of a relay is required if more
than 6 amps is needed.
18. Verify that the battery voltage reads correctly. If it appears
low, make sure you have good wiring for the 12 volt power
and the ground.

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Typical Dual Stacked Sender Installation

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CHAPTER 7 - TROUBLESHOOTING GUIDE
Display trouble codes:
If a sender or its wiring is not operating properly, the following
codes are shown on the display:
1. If a sender is unresponsive or there is an open circuit in the
wiring so that the sender is not connected, the display will
indicate an open circuit by showing “OPn” on the LED display.
2. If a sender is shorted or there is an short in the wiring, the
display will indicate a short circuit by showing “Sht” on the
LED display.
3. If a sender is sending bad data, there is damaged wiring, or if
there is electrical interference, the display will indicate a data
error by showing “Err” on the LED display. Also, if the senders
have not been programmed correctly, they can interfere with
one another and result in “Err” on the LED display. Check all
the senders to make sure they are programmed correctly. If
they are, replace the sender that is creating the error.
4. If the display has been programmed for a single sender, and
dual stacked senders have been connected, the display will
show “StA”. In this case, change the senders or reprogram the
display as required. If only a top sender has been connected,
the display will show “nbo”, indicating that no bottom sender
has been received. If the tank should only have 1 sender,
correct the programming on the sender, it should not be a
top sender.
5. If the display has been programmed for dual stacked senders
for tall tanks, and only the bottom sender is working and the
top one is not, then the display will show “ntP” indicating that
no top sender is being received. If the top is working but no
bottom sender is being received, then the display will show
“nbo”. If neither sender is working, then the display will show
“OPn”. Check the wiring and the programming of the senders.
If all is OK with that, replace the bad sender.
6. For the LPG tank, “Opn” indicates an open circuit in the wiring
or a bad resistance sender in the LPG tank. If there is a short
in the wiring, the display will read zero all the time.
7. The display contains a permanent memory which is used to
store the programming for battery voltage calibration value,
the LPG calibration value, and the tank sender signal levels.
These signal levels are used to help the system adapt to the

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tanks, which increases sender accuracy at low tank levels.
If this memory should fail, “CAL” will be ashed on the LED
display, indicating a calibration failure. It will be necessary to
replace the display if this occurs.
The diagnostics can be used to check the wiring and the
senders:
1. If a short circuit is showing, disconnect the senders one at a
time at the sender location. If the short circuit indication goes
away when a sender is removed, then that sender is bad. If all
the senders are removed but a short circuit still shows, then
the wiring may be shorted. Disconnect the sender wire at the
display, the short indication should go away. If it doesn’t, the
display is bad.
2. If an open circuit for all the senders is showing, it is most likely
a wiring open circuit or display failure, since it is unlikely that all
three senders are bad. Try shorting the wiring together at the
display, the display should indicate a short circuit. If it doesn’t,
the display is bad. If it does, then remove that connection and
short the wires together at the sender locations. If no short
circuit is shown, then the wiring is open. If the display does
show a short circuit, then the senders must be bad.
3. If a single sender is showing an open, try shorting the wiring
together right at that sender. If a short now shows, the sender
is bad or not wired properly. If no short circuit shows on the
display, the wiring to that sender is open.
To review the sender diagnostics:
1. The sender diagnostics can be reviewed periodically to check
for any degradation of the tank senders. If a sender appears
to be malfunctioning, reviewing the diagnostics should be the
rst step in the troubleshooting process. Note that there are
no diagnostics for the battery voltage or LPG.
2. There are two diagnostics for the senders: the signal power,
and the sender height.
a. The signal power is an indication of how much signal is
being transmitted through the tank wall and picked up
by the receive part of the sender. If the signal power is
too low, it can indicate a sender which is detached from
the tank, excessive buildup on the inside of the tank, bad
wiring to the sender, low battery voltage, or a defective
sender. Typical signal power should be 50% - 60%. The
minimum signal power for proper operation is 20%.

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b. The sender height is the number of receive segments
present in the sender. To determine the length of the
sender, multiply the calibration by 1.5 to get the length in
inches. The senders always auto calibrate to the length that
they are cut, so this diagnostic allows the user to conrm
the length and to make sure that the auto calibration is
working properly.
3. To check the diagnostics, press the button for the tank to be
checked until the display shows “dIA”.
4. Release the button, the display will then change to showing the
signal power diagnostic. This is indicated by a “P” showing on
the left digit, for example ”P26” indicates a 26% signal power.
5. The signal power will show for 4 seconds or until the button
is pressed again. The display will then change to showing the
sender height. This is indicated by a small “h” showing on the
left digit, for example “h 6” indicates that the sender has 6
receive segments, which is 9 inches high.
6. After 4 seconds of showing the height, or when the button is
pressed again, the display resume normal operation.
Troubleshooting Tips:
1. If the panel is unresponsive, try rebooting it by shutting off
the power to it for a few seconds.
2. For dual display console applications, if the consoles diagree
the most likely reason is a bad console ground.