Sentinel Hub User manual
REQUIREMENTS
•
Sentinel Boat Monitor device
•
Sentinel HUB
•
Sentinel Marine solutions app (Android or iOS)
Installation Guide
Sentinel HUB
v1.1
1. Mounting
2. Wiring
The Sentinel Hub should be powered with one CR2032 battery and/or external voltage up to 60 V.
Even when the device is connected to external power supply, you can install the CR2032 battery if
operation without external supply is requred.
Sentinel Hub has two mounting holes located under hinged covers on the top of the device. The holes
can be accesed by lifting the covers. Please use the drawing below for mounting reference.
We recommend mounting the device to a wooden or plastic panel. Panels made of metal can interfere
with the Bluetooth reception and significantly reduce the range of communication.
Also avoid large conductive surfaces between the Sentinel Boat Monitor and Sentinel Hub devices if
possible. Conductive surfaces such as engine firewall, metallic cabinets, etc... will reduce range of com-
munication and can make the connection unstable or even disable it completely. If conductive surfac-
es cannot be avoided, check the signal strength after pairing to make sure that the connection is
stable.
Sentinel Hub has a built-in temperature, humidity and pressure sensor. To ensure these measure-
ments are realistic, place the Hub in a shaded area, away from any sources of heat and protected from
splashing water and rain.
75
75
60.4
∅7.5
M3 Mounting hole
When connecting any input line (analog or digital), always protect the battery and electrical circuit
from potential damages with a fuse. Install a fuse holder with 1 A fuse on the positive (+) power cable
as close as possible to the battery terminal.
2
2.1 Digital inputs/outputs
The Sentinel Hub should be powered with one CR2032 battery and/or external voltage up to 60 V.
Even when the device is connected to external power supply, you can install the CR2032 battery if
operation without external supply is requred.
Sentinel hub has two general purpose digital inputs, one dedicated digital input for engine speed
(RPM) measurement and two relay outputs. It also provides an interface to connect an external tem-
perature probe (optional, not included).
Digital inputs indicate presence of a voltage connected between each input and GND terminal.
Voltages lower than 5 V are displayed as logical 0 (“off”), higher are displayed as 1 (“on”). See magnetic
switch on Fig. 3 (page 6, example drawing).
Relay outputs work as a switch, connecting both terminals of each output together. Both relay outputs
are »latching«, which means that each output keeps its state, even after supply and battery was
removed.
Maximum switching current is 2 A per each output. To switch high power loads, use an external DC
power relay of sufficient capacity. The nominal voltage of the relay should match the system voltage
(12/24 V). See power relay on Fig. 3 (page 6, example drawing).
When connecting any input line (analog or digital), always protect the battery and electrical circuit
from potential damages with a fuse. Install a fuse holder with 1 A fuse on the positive (+) power cable
as close as possible to the battery terminal.
Basic wiring
SW1
SW2
IN 1
IN 2
Rsh hi
Rsh lo
RPM in
+Vbat
GND
GND
DATA
POWER
Temp.
probe
SW1
SW2
IN 1
IN 2
Rsh hi
Rsh lo
RPM in
+Vbat
GND
HUB
+
CR2032
5 - 60 V
2
3
2.2 External power supply, voltage/current measurement
The device can be supplied from one CR2032 battery and/or from Vbat terminal. When Vbat terminal
is connected, the batteries are only used as a backup power source in case external voltage is discon-
nected.
Vbat input (referenced to the GND terminal) is also used as an analog voltage input. The input
can measure voltages from 0 V to 60 V.
Current measurement can be achieved by measuring the dropout voltage on an external
shunt resistor. The shunt resistor can be placed either in positive (high-side) or negative (low-side)
terminal of the measured circuit. Select a shunt resistor which at maximum current does not exceed
the shunt input differential voltage range of ±80 mV. The current measurement is bi-directional, show-
ing current flow in both directions. Figures 2.2A and 2.2B show high-side and low-side current meas-
urement.
The system is pre-configured for 500A/50mV shunts. If you install a different value, please report your
2.3 Engine RPM input
RPM input is designed to work with an alternator's RPM pulse ouptut, most commonly marked "W".
Alternator's pulse ouptut is a scaled representation of actual RPM, which is often called a "pulse code".
Default engine pulse code is set to 10.7. In case your alternator has a different pulse ratio, please con-
tact support.
High side current measurement2.2A Low side current measurement2.2B
SW1
SW2
IN 1
IN 2
Rsh hi
Rsh lo
RPM in
+Vbat
GND
GND
DATA
POWER
Temp.
probe
SW1
SW2
IN 1
IN 2
Rsh hi
Rsh lo
RPM in
+Vbat
GND
HUB
12/24 V
Shunt resistor
Load
SW1
SW2
IN 1
IN 2
Rsh hi
Rsh lo
RPM in
+Vbat
GND
GND
DATA
POWER
Temp.
probe
SW1
SW2
IN 1
IN 2
Rsh hi
Rsh lo
RPM in
+Vbat
GND
HUB
12/24 V
Shunt resistor
Load
RPM input is also used as an engine hours counter, counting the cumulative time the engine was oper-
ating.
When using the Hub to measure RPM, please connect the +Vbat supply line as well in order to ensure
the correct operation.
4
2.4 Wired temperature probe
3. Example use case
In the following example the Sentinel Hub will be used to monitor one (magnetic) switch, used as a
door sensor and switch one AC load line as shown in fig 3.
1. Connect the wires for magnetic switch to IN 1 and power relay coil to terminal SW 1.
2. Attach the ground wire to the terminal labeled GND.
3. It is recommended to connect the 12/24 V power line to +Vbat input to supply the hub and monitor
the battery supply voltage.
A wired temperature probe can also be used to measure temperature in ducts, on different surfaces,
etc... A probe with 3m cable can be purchased separately.
Connect the wires labled GND, DATA and POWER of the temperature probe into the designated holes
in the Temp. probe connector.
RPM input is designed to work with an alternator's RPM pulse ouptut, most commonly marked "W".
Alternator's pulse ouptut is a scaled representation of actual RPM, which is often called a "pulse code".
Default engine pulse code is set to 10.7. In case your alternator has a different pulse ratio, please con-
tact support.
Engine RPM
2.3
RPM input is also used as an engine hours counter, counting the cumulative time the engine was oper-
ating.
When using the Hub to measure RPM, please connect the +Vbat supply line as well in order to ensure
the correct operation.
SW1
SW2
IN 1
IN 2
Rsh hi
Rsh lo
RPM in
+Vbat
GND
GND
DATA
POWER
Temp.
probe
SW1
SW2
IN 1
IN 2
Rsh hi
Rsh lo
RPM in
+Vbat
GND
HUB
Alternator
Engine
Battery
Pulse
output
(W - terminal)
5
4. Pairing and configuring the Sentinel Hub
1 2
3 4
Tap the + sign at the top
of the screen.
Nearby device will be
shown. Select the
device.
Please make sure the
Sentinel HUB and the
Boat Monitor are close
enough to each other,
then press Continue.
Scan the QR code on the
HUB.
AC 110V/220 V
L
N
LOAD
(HVAC...)
12/24 V
SW1
SW2
IN 1
IN 2
Rsh hi
Rsh lo
RPM in
+Vbat
GND
GND
DATA
POWER
Temp.
probe
SW1
SW2
IN 1
IN 2
Rsh hi
Rsh lo
RPM in
+Vbat
GND
HUB
Magnetic
reed
switch
Power
relay
Example use case
3
6
5. Using the system
To begin, open the “Sentinel Marine solutions” app and login. In the Sensors tab, several new sensors
will appear (Temperature, humidity, air pressure, current, battery voltage, ...). Press the “Edit” button
to change which sensors are shown.
NOTE!
If your Boat Monitor is not yet registered to your Sentinel account, follow the steps in the “Boat
Monitor Installation guide” before proceeding.
NOTE!
The Sentinel HUB adds several additional sensorts to the system, which may require a change in
your Boat Monitor subscription.
5 6
Wait for report of
pairing status.
You will be notified
when pairing is
successful.
Open the Switches tab. Here you will be able to toggle Hub outputs ON or OFF. You can rename the
switches by pressing the “Edit” button.
7
6. Technical specification
(1) Depends on wall materials and thicknesses.
(2) Only battery operation, no external voltage applied.
Sentinel HUB compliance
This product is marked with logo and uses radio frequency bands that are harmonized
throughout the European Community and others. Declaration of conformity is located in
the box together with warranty list.
CONTACT
www.sentinelmarine.net
Value
60V
0 - 60V
0 - 30V maximum
-80mV to +80mV
Relay contact
Parameter
Internal environmental sensor
Temperature probe (optional)
Absolute maximum voltage on terminals IN 1, IN 2, RPM IN, +Vbat
Vbat measurement voltage range
Shunt input common mode voltage
Shunt input dierential voltage range
Digital output type
2 A maximumOutput switch current
20 kHzRPM IN maximum input frequency
5VIN 1, IN 2, IN 3 threshold voltage
± 1°CFull range temperature accuracy
± 3% RHFull range humidity accuracy
± 1 hPa at 0-65°CFull range pressure accuracy
± 0.5°CTemperature probe accuracy
-20°C to 105°CTemperature range
1 x CR2032 battery and/or external analog voltagePower supply
-25°C to 60°COperating temperature
0 - 100%Operating humidity
Up to 30 m indoor(1) Up to 50 m outdoorWireless operating range
Bluetooth low energy (BLE)Wireless communication protocol
65 mm x 65 mm x 28 mmDimensions
More than two years(2)
Battery life
Other manuals for Hub
1
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