The Sentinel monitors three distinct parts of the lining process: pressure of the liners, power supply and water levels in pumping stations, and also features a remote alarm. The Sentinel sends a text message alert via the GSM network to a cell phone should there be a power outage, fluctuation of the pressure outside the limits, or should the water level in a pumping station rise too high. The Sentinel settings are easily adjusted by GSM commands. Pressure data can be requested via text message.
SENTINEL LINER GUARD
2x pressure connectors, 1x water level monitor (upgradeable), power supply monitoring 110-230v / 50-60Hz, 3-phase powers supply monitoring 400v / 50-60Hz and 3-phase alarm (sound, text message & call).
Illuminated LCD screen with polycarbonate shield, military grade connectors, battery back-up, user adjustable GSM numbers, user adjustable limits for high/low pressure with values lP67 sealed closed and lP64 open.
CE & FCC approved.
This machine is intended for the following uses; 1. Monitoring pressure of the linings.
2. Monitoring power supply.
3. Monitoring water level in pumping stations.
Sentinel has a built in remote alarm feature. This allows it to send an alert message to a mobile phone in cases of power outage, fluctuation of the pressure outside the limits or water level in a pumping station rise too high. The alert messages are sent via the GSM network.
FUNCTIONS AND USAGE
VOLTAGE & POWER SUPPLY
Ensure that the supply voltage is correct. The voltage of the power source must match the value given on the nameplate of the machine within the tolerances of ±10 %. Machines with a 230V plate can be used in 220V mains and 110V machines in the 120V grid. The machine has been double sealed according to European standards. The power source has to be grounded. To begin using the Sentinel device, connect it to a mains power socket using the provided cable. Always connect the power supply provided to the Sentinel unit. The unit has a back-up battery as well, but it is only intended as a back-up for pressure measurement and to send alarm messages in the event of power failure, and is NOT a substitute for the mains power supply.
Sentinel Guard uses a Mini sized SIM card. The SIM card slot is found next to the LCD screen, under the T shaped cover. To access the slot, unscrew the six screws holding the cover (see picture from below). The SIM card slot opens by sliding it to the left and lifting it up. Before inserting the SIM card into the Sentinel Guard, the PIN code lock must be turned off. This can be done by inserting the SIM card into a mobile phone and turning the PIN code lock off. After inserting the SIM card into the Sentinel, put the T shaped cover back on top, and gently fasten the screws. It is recommended to use subscription based SIM cards and not prepaid SIM cards. Prepaid SIM cards might run out of credit or be closed down inconspicuously.
To begin using the Sentinel Guard device, connect it to a mains power socket using the provided cable. Start the device by pressing the POWER switch. The startup process will take a few seconds, and after that the device is ready to use. Always connect the power supply provided to the Sentinel Guard unit. The unit has a back-up battery as well, but it is only intended as a back-up for pressure measurement and to send alarm messages in the event of power failure, and is NOT a substitute for the mains power supply.
LCD SCREEN—DEFAULT SETUP
Screen has five different pages which can be changed by pressing the INFO switch.
PRESSURE & POWER ALERT
The first page of the LCD screen shows the pressure from both sensors. This makes it possible to monitor the liner pressure at the same time as adjusting it. The pressure is shown in kilopascals (kPa). Along with showing the pressures, the first page also shows if the power alarm is disabled or enabled. 10 kPa = 0.1 Bar, 100 kPa = 1.0 Bar, 10 kPa = 1.45 psi
PRESSURE ALARM LIMITS
The second page of the LCD screen shows the low and high limits of the pressure alarms. The limits can be chosen individually for both sensors. The limits work intuitively: if the pressure drops below the low limit, or raises above the high limit, alert messages will be sent. The default limits are 35 kPa (5.07 psi) for low limit and 85 kPa (12.3 psi) for high limit. Pressure alarm limits can be changed at any time. Look at the section: Changing Parameters.
UPTIME The third page of the LCD screen shows the up-times. The up-times can be used to monitor the amount of time the liner has been curing. The uptime begins to run when the respective P# switch is pressed. The uptime resets to zero if the respective P# switch is pressed again or if the Sentinel device is rebooted.
DETAILS The fourth page of the LCD screen shows some useful pieces of information, such as the GSM network signal, the serial number of the device, and the GSM number of the SIM card. Some network operators do not save the GSM number to the SIM card. In this case, the GSM number will be shown as unknown. You may write the number of the SIM card to the quick help sticker located in the Sentinel case instead.
The Sentinel Guard device has two stages should an alarm occur. First, the device will alert with sound and light signals for two minutes. Second, if the cause of the alarm has not been fixed within the two minutes, the device will start sending alert messages.
The alert messages are sent via the GSM network. The alert messages will include the cause of the alarm. Along with sending alert messages, the device will call the number for a short amount of time. If the cause of the alarm is fixed after the messages have been sent, the Sentinel device will send messages notifying that the alarm condition has been fixed.
ALARM The final page of the LCD screen shows all the numbers in the SIM card memory. The numbers are shown as a list, and if more than 4 numbers have been added, the page will scroll down for a new set of numbers.
GSM NUMBERS The Sentinel Guard device works in the GSM network. Therefore, it is imperative to have a GSM network signal. The signal level can be seen in the details page of the LCD screen by pressing the INFO button. Should the signal drop below 2, the LCD screen will turn red and the signal level is being flashed in the details page of the LCD screen. The antenna is located on the inner lid of the Sentinel device, to which it is attached with a black velcro tape. If the signal is too weak, you can try to either reposition the Sentinel device, or take out the antenna and move it around to find a high signal spot.
GSM NETWORK SIGNAL & ANTENNA The Sentinel Guard device can monitor either the pressure of a liner or a compressor. To connect the pressure to the Sentinel Guard, use a T –adapter. Both measuring and monitoring the pressure is possible with the Sentinel Guard device. To measure the pressure, simply connect a pressure connector to one of the pressure ports of the Sentinel Guard device. To monitor the pressure, simply connect a pressure connector to one of the pressure ports and push down the respective P# switch. Should the pressure drop below the low limit, or rise above the high limit, the device will begin the alarm procedure. The pressures can also be checked remotely by sending an SMS command “Pressure” to the device. The device will then respond with a message “Pressure (kPa): #1 xx, #2 yy” where xx and yy are the pressures of the sensors #1 and #2.
POWER FAILURE ALARM
The Sentinel Guard device can also be used to monitor the mains power supply. The device can be connected to the same mains socket as the compressor or pumping station. Should there be a power outage, the device will begin the alarm procedure. The status of the mains power supply monitoring can be seen in the first page of the LCD screen. If the device is started without connecting the power connector, the screen will remain red and the power supply monitoring will be disabled.
The Sentinel Guard device can also be used to monitor water level. The device will come with one water sensor included. The sensor can be connected to the water sensor socket, after which the W# indicator will be lit. If the indicator is not lit even though the sensor is connected, the sensor might not be properly connected; reattach the sensor. The sensor should be installed around 5 to 10 cm above the floating valve of the pump. The sensor should not be installed directly below the inlet pipe of the pumping station; instead, install is so that it is clear of major splashes. Should the sensor be covered in water, the device will begin the alarm procedure. The sensor will most likely get dirty during usage, and it can be cleaned by unscrewing the four Phillips screws and rubbing the circuit board found inside with rubbing alcohol.
CHANGE SETTINGS AND SMS COMMANDS
The Sentinel Guard default settings can be changed when needed by SMS commands. Simply send a command message to the device number to alter any setting needed. Press Info Button to check from the correct page that the setting has been changed as intended.