Synetica enLink Status-DP User manual

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enLink Status-DP/AF
Differential Pressure / Airflow Sensor User Guide
LoRaWAN Wireless Differential Pressure / Airflow Sensor
•LoRaWAN long range wireless.
•Battery powered.
•High accuracy across a wide range of pressures.
•Status-DP supplied with Duct Fixing Kit to monitor differential pressure.
•Status-AF supplied with Multi-Point Air Velocity Probes measure average velocity pressure across air
ducts. Probe lengths of 100mm to 600mm available.
Status-DP measures differential pressure in the range of 25Pa to
5000Pa with industry leading accuracy of 0.1% of selected range.
Easily detect blocked filters in building ventilation systems to
reduce the risk of spreading disease. Differential Pressure data is
transmitted to the cloud using long range LoRa wireless where the
device data can be displayed and analysed to reveal operational
performance and generate alerts.
enLink Status-AF measures air velocity in the range of 0 to 40m/s
with industry leading accuracy of 0.1%. This sensor can be used to
ensure that recommended air flow rates for public buildings and
industrial plant are achieved. Air velocity data is transmitted using
long range LoRa wireless for integration with cloud services or on-
site systems via Modbus IP to reveal operational performance and
generate alerts.
The units are battery powered with long life of 3+ years#.
A built in USB port allows all parameters including pressure ranges,
sampling interval, wireless signal strength and wireless network
configuration to be viewed and set using simple menus via any
USB enabled host such as a PC or Mac.
Features
•Differential pressure and Airflow
monitoring*
•LoRa long range wireless
•Frequency Range 863-870MHz*
•Frequency Range 902-928MHz*
•Up to +16dBm Tx Power
•Built in USB port for power and
configuration
•Battery powered
•CE / FCC compliant
•RoHS compliant
•Made in the UK
*Option / Model dependent
#Dependent on settings and environment

SYNETICA enLink Status DP/AF User Guide Rev 1.6 Page | 2
1. Introduction
enLink LoRaWAN devices are configured using OTAA (Over-the-Air-Activation).
OTAA is the most secure way to connect a device to the LoRaWAN network. In OTAA, the device performs a Join-
procedure with the network, during which a dynamic DevAddr (device address) is assigned and security keys are
negotiated with the device.
The OTAA configuration requires the following parameters to be correctly set:
•DevEUI: End-device Identifier. It is unique for every device and is set at device manufacture.
•AppEUI: Application Identifier. Used to identify the end application.
•AppKey: Application key. Used to create the session keys.
*Note: In LoRaWAN 1.1, AppEUI was renamed to JoinEUI.
For many applications Synetica can supply enLink Status with the AppEUI and AppKey pre-configured, so providing the
LoRa gateway has the matching values, the join process will happen automatically once the Status unit is in wireless
range and switched on.
The DevEUI is always set at device manufacture and is unique. The device AppEUI and AppKey can easily be set via the
USB connection if required and the process is detailed later in this document.

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2. Powering the unit
To power the device ON, remove the cover of the enLink Status by unscrewing the two screws on the cover. Locate the
power switch, shown below and using small screwdriver gently slide the power switch towards the Off position.
Insert the 2 x AA sized Lithium 3.6V batteries taking great care to insert them the correct way around. Locate the plus
(+) and minus (-) signs on the battery and use the plus (+) and minus (-) guides on AA battery holders to insert the
batteries in the proper direction. Both batteries face in the same direction.
Be sure to insert the minus (-) end first and remove the plus (+) end first when replacing the batteries.
Lithium batteries have very high energy capacity and a great degree of care should be exercised to ensure
that all batteries are new, from the same manufacturer, installed the correct way around and are not in
any way damaged. Refer to Section 9 Error! Reference source not found. for more details.
Check that the batteries are correctly inserted and then slide the power switch to On.
Switch to the ON position
Once powered ON, the enLink device will send a Join request message to the LoRaWAN network server. The Status LED
will blink RED as shown below whilst the Join process is taking place. Depending on factors such as signal strength, RF
interference etc. the join process may take several seconds to complete.
Blinking Red LED –Attempting Join
When the device has successfully joined the network the Mode LED will blink GREEN five times to show that the join has
been completed. The LED’s will then switch off to conserve the batteries.
Blinking Green LED –Device Successfully Joined
On
Off

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3. Setting / changing the LoRaWAN keys and device parameters
The unique DevEUI is printed on all enLink devices and is also present in the QR code. The DevEUI can be used to
identify the device once joined to the network.
For many applications, Synetica can supply enLink units with the LoRaWAN AppEUI and AppKey parameters pre-
configured to your requirements, whereby if the LoRa gateway has matching keys the join process will happen
automatically once the unit is in wireless range and switched on.
The DevEUI is always set at device manufacture and is unique. The device AppEUI and AppKey can easily be set via the
USB connection as detailed below.
Connect a micro USB cable to the enLink unit. The device will attach to a COM port on your PC.
Using a terminal program (e.g. Tera Term https://ttssh2.osdn.jp/) connect to the COM port used by the enLink device.
To verify which COM port is being used, check the Windows™ Device Manager (In Windows - Click the Start button, type
device manager into the search box and tap Device Manager on the menu.) Expand the Ports (Com & LPT) menu as
shown below.
In your terminal program press the Enter key. An enLink summary screen will appear as shown below. The default
password is the last four digits of the displayed DevEUI, in the screen below this is 2a29.
enLink logon screen
The screen below will show with the enLink Main Menu options. Enter Qto enter the Quick Start Menu.
enLink Main Menu

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The Quick Start Menu contains only the parameters that normally need to be configured to setup the device and join the
LoRa network.
From the Quick Start Menu you can change the AppEUI and AppKey.
Quick Start Settings Menu
From the Quick Start Settings Menu, access the AppEUI setting by entering e. Enter the 16 character AppEUI using
numbers and letters a to f. Do not include spaces or any other characters. Pressing Swill enter the default AppEUI
which you can then edit. Rwill set a random AppEUI. Press Enter when the key is correctly entered to return to the Quick
Start Settings Menu.
AppEUI setting
From the Quick Start Settings Menu access the AppKey setting by entering k. Enter the 32 character Appkey using
numbers and letters a to f. Do not include spaces or any other characters. Pressing Swill enter the default AppKey
which you can then edit. Rwill set a random AppKey. Press Enter when the key is correctly entered to return to the
Quick Start Settings Menu.
AppKey setting
Press Xfrom the Quick Start Settings Menu to return to the enLink Main menu.
The header will show ** Reboot Required ** as shown below. The new key settings will not take effect until the enLink
device is restarted. Enter Rto reboot followed by OK. The device will restart with the entered AppEUI and AppKey and
attempt to join the LoRa network.

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Reboot Required notification
Check your LoRaWAN network server to verify that the enLink device has joined successfully.
4. Setting / changing the transmit interval
Access the Transmit Interval setting by entering t from the quick start menu.
Transmit Interval settings
Select a fixed transmit interval from the menu options. 15 minutes or longer is recommended to extend battery life.
Press Enter when the key is correctly entered to return to the Quick Start Settings Menu.

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5. Setting / changing the pressure sensor parameters
The pressure sensor parameters can be offset to compensate for pipe lengths, environmental conditions and sensor
drift.
From the Main Menu access the configuration menu by entering C. This screen will display the current device
temperature, humidity, pressure sensor values and also provide access to live readings.
Configuration menu
Enter P to view the Differential Pressure / Air Flow menu
Enter T to select transmission of Pressure data only, Airflow data only or both.
Press Xto return to the Options menu and then enter D to enter the offset menu. The offset value is used to zero the
measurement when there is no airflow or differential pressure present to correct the small errors due to pipe lengths,
environmental conditions and sensor drift. Enter a value which will set the pressure to Zero, negative or positive values
can be entered to correct the reading to Zero.
Enter Xto return to the options menu.
The Doption displays live readings, which can be used to verify the readings before deployment.

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Live readings display
6. Sensor Installation
Depending on the probes used, the enLink Status unit can be used as either a differential pressure monitor or as an
airflow monitor.
7. Differential Pressure / Air Filter Monitoring
When a filter starts to clog, its resistance to air flow increases. In systems where the airflow is kept at a constant level,
this leads to a rise in the differential pressure across the filter.
Air filters can only perform well when the pores remain unclogged. Filters should be replaced when they begin to clog to
ensure economical, safe and efficient operation. Clogged filters can lead to an undersupply of ventilation, increase in
energy consumption, and noisy fan operation. Filters which are dirty and humid can provide be a breeding ground for
mould and bacteria, damaged filters can be hazardous.
To monitor the filter condition, attach one of the supplied pitot probes to either side of the filter as shown below. Ensure
that the port on the Status unit shown as + goes on the air flow input to the filter and the port shown as –on the
downstream side of the filter.
With the fan in the off state the differential pressure should be close to zero. If necessary, offset the pressure reading to
as close to zero as possible using the instructions in section 5.

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Differential Pressure Sensor to monitor filter condition.
8. Airflow Monitoring
Measuring the airflow in ducts is an important maintenance aspect of a HVAC system. Each system is designed to work
under a given load. Lower loads can lead to an underperforming system and higher loads can result in reduced
efficiency and increased running costs.
To monitor the airflow, insert the airflow probe into the duct as shown below.
The airflow probe should be mounted in the duct where it can measure the unrestricted airflow and at least 2
metres downstream from dampers, duct bends, fans, filters, humidifiers, heating or cooling coils.
•Avoid installation into systems with turbulent airflow.
•Ensure that the two end probe caps are fitted and not loose.
•Ensure that the probe is mounted with all the holes inside the ductwork and the mounting flange is providing
a good airtight seal.
•Ensure that the probe is mounted with the arrow pointing in the direction of the airflow.
•Ensure that the tube connections for the Hi and Lo ports are matched on the Status Unit.
•Secure the pipes to the probe with cable ties if necessary.
With the fan in the off state the airflow should be close to zero. If necessary, offset the sensor pressure reading to as
close to zero as possible using the instructions in section 5.
Airflow Probe
+
-
Air
Supply
Fan
Filter
enLink Status Differential Pressure Sensor
Length options from 100mm to 600mm
18mm
5mm
Neoprene foam gasket

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Airflow Sensor to monitor ventilation rate.
+
-
enLink Status Airflow Sensor
Air
Supply
Fan
Filter

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9. Battery Installation / Replacement
enLink devices use SAFT LS14500 or EVE ER14505 AA size 3.6 Volt Lithium Thionyl Chloride (Li-SOCl2) batteries (non-
rechargeable) or direct equivalent.
No other batteries are approved for use in the device.
Lithium Thionyl Chloride batteries have very high energy capacity and must be used and handled with care observing the
guidance below.
WARNING
Risk of death or serious injury from explosion or fire.
•Keep out of sight and reach of children.
•Fire, explosion and burn hazard - do not recharge, short circuit, crush, disassemble, incinerate.
•Due to the high terminal voltage (3.6V), they are not suitable as direct replacements for other battery technologies in the same can sizes.
•When not in use the Batteries must be stored in a non-Hazardous Area.
•Do not change batteries in an explosive gas atmosphere.
•When installing batteries, do not snag the battery terminal on the clip or the battery may be damaged. Do not apply excessive force.
•Do not drop. Dropping the battery may cause damage. If a battery is dropped, do not install the dropped battery into the unit. Dispose of dropped
battery promptly per local regulations or per the battery manufacturer’s recommendations.
Guidance
•Always install the batteries correctly as per instructions taking great care to observe the battery polarity.
•Ensure that the contact points are clean and conductive.
•All batteries must be the same model from the same manufacturer.
•Do not mix old and new batteries or batteries from different manufacturers.
•Do not heat or attempt to recharge the battery.
•Do not dispose of in a fire.
•Only install approved batteries: SAFT LS14500 or EVE ER14505 Lithium Thionyl Chloride AA Battery 3.6 Volt, or direct equivalent.
Safe disposal
•Please recycle responsibly, a wide range of schemes are available.
•Do not dispose of in normal waste or in a fire.

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10. Power Considerations
The device is powered with 2 x 3.6V Lithium-Thionyl chloride (Li-SOCl2) AA sized batteries.
The pressure sensor consumes additional power while actively sensing and therefore, to prolong battery life, the
sampling interval should be set to the longest period practical for the application. Sampling / transmission intervals of
less than 15 minutes place strain on the batteries, limiting their capacity and should be avoided if possible.
Battery capacity is dependent on ambient temperatures and this should be considered when estimating battery life. Low
temperatures slow down electrochemical reactions significantly and increase the internal resistance of the batteries.
High temperatures increase the battery self-discharge. The chart below illustrates the effect of temperature on the
available battery capacity.
Battery capacity vs current at various temperatures for
SAFT LS14500 batteries.
Battery life is also highly dependent on the LoRa spreading factor used. Higher spreading factors result in longer active
times for the radio transceivers and shorter battery life. Positioning devices in closer proximity to a gateway will
generally result in lower spreading factors, shorter time on air and much lower transmit power.
11. LoRaWAN Payload Decoder
The latest LoRaWAN payload decoders and guides are available on the Synetica GitHub repository:
https://github.com/synetica/enlink-decoder
A live payload decoder which allows you to paste LoRa payloads in Hexadecimal or Base 64 and see the correctly
decoded results can be found at the link below:
https://synetica.github.io/enlink-decoder/
12. Technical Support
For technical assistance, please visit the downloads section of our web site at www.synetica.net or email us at
[email protected]