Laird Sentrius RS1 Series User manual

A
Version 2.0

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Version
Date
Notes
Contributors
Approver
1.0
07 Jan 2019
Initial Release
Robert Gosewehr
Chris Hofmeister
1.1
28 Aug 2019
Reflect new part numbers and modified
probe specification
Chris Boorman
Jonathan Kaye
2.0
14 July 2020
Updates to incorporate new RTD ext. temp
sensor
Chris Boorman
Jonathan Kaye

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1Introduction..........................................................................................................................................................................4
2Product Overview................................................................................................................................................................4
3Installation ...........................................................................................................................................................................5
3.1 Illustrations.................................................................................................................................................................6
3.1.1 External Temperature Probe Cable Assemblies...................................................................................................6
3.1.2 RJ45 Cable Gland................................................................................................................................................7
4Connection Status...............................................................................................................................................................8
5Data Visualization................................................................................................................................................................9
5.1 Sentrius Sensor Mobile App.......................................................................................................................................9
6Battery Consumption.........................................................................................................................................................10
7Sanitation and Cleanliness................................................................................................................................................10

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This user guide explains how to properly install both the original RS1xx External Temperature Probe, with its 1-Wire integrated
digital thermometer, along with the latest RS1xx External RTD Temperature Probe, with a Class A PT100 RTD.
The guide also explains how to view sampled data using the Sentrius Sensor Mobile App.
Both variants of the Sentrius RS1xx series of LoRa / BLE Sensors enable use of an external cabled temperature probe, in
place of the integrated temperature sensor. Each of the sensors are IP67 rated cable assemblies with a stainless-steel probe,
the difference in physical probe dimensions and supported operational temperature is outlined below. The cabled probes
connect into the main body of the Sentrius Sensor via a CAT5 IP67 rated RJ45 connector.
Note: This guide only contains a brief walkthrough. Refer to the RS1xx Guide for further details on sensor functionality and
the mobile app capabilities. To access the RS1xx Guide, navigate to the RS1xx product page, click Documentation,
and select the Sentrius RS1xx User Guide.
Figure 1: Sentrius sensor enclosure with external digital
temperature probe
Reference
Description
Left
IP67-rated, 1-Wire integrated digital sensor,
-55° to +125°C range, 1520 mm cable length,
213 mm probe length, 6.0 mm dia. stainless
steel temperature probe CAT5 RJ45 connector
Right
Sentrius™ RS1xx LoRaWAN Ext. Port Temp
Sensor
Figure 2: Sentrius sensor enclosure with external RTD
temperature probe
Reference
Description
Left
IP67-rated, Class A PT100 RTD sensor, -40°
to +180°C range, 1320 mm cable length, 100
mm probe length, 4.0 mm dia. stainless steel
temperature probe CAT5 RJ45 connector
Right
Sentrius™ RS1xx LoRaWAN Ext. Port Temp
Sensor
The external temperature probe is ordered separately from the Sensor body, in single or bulk.
See the Laird RS1xx product page for ordering information.

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To install the external temperature sensor, refer to Figure 3 and follow these steps:
Unscrew the Ethernet cap (1) from the Sentrius
Sensor.
Connect the RJ45 connector from the cable
assembly into the external port of the Sentrius
Sensor.
Screw on (by hand) the top portion of the cable
gland –the screw nut (3) –until tight.
Visually check to ensure the lower portion of the
cable gland –the pressing screw (2) –is also
tight.
Figure 3: Installing the external temperature sensor
Note: Ensure that references (2) and (3) in Figure 3 are tight when installing the external temperature probe into the
Sentrius Sensor. If these areas are not sufficiently tightened, this could lead to a potential leak and cause damage to
the sensor’s external port connector or to the temperature probe cable assembly.

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Figure 4: 1-Wire Digital Thermometer Probe cable assembly
Figure 5: RTD Temperature Probe cable assembly

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(DIM in millimeters)
Figure 6: RJ45 cable gland

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When the external probe is connected properly to the sensor, the sensor will operate “normally” once powered up. Normal
operation of the sensor is indicated by the left LED flashing either an “orange” or “green” color to indicate the connection status to
a network.
With the 1-Wire Digital Thermometer Probe, a connection problem at power up is indicated by both LEDs on the front panel being
constantly on. This is a visual indicator to the user that there is a communication issue between the sensor and the probe.
With RTD Temperature Probe firmware implementation being a little different the LED function is not currently enabled, however,
both sensors support the feature where the 'sensor fault' bit is set in the LoRa messages when disconnected.
For more information to check this bit, refer to the ‘RS1xx LoRa Protocol Application Note’ available under ‘Application Note’ tab in
the documentation section on the RS1xx product page.
In either case, if the sensor cannot detect the external probe it will not function properly.
To remedy this, follow these steps:
Retry the steps from the Installation section. Make sure the sensor has the latest firmware installed to ensure the sensor
has all the latest capabilities. The firmware can be updated using the mobile app. Reference the RS1xx operational guide
for more details, available on the RS1xx product page.
The time it takes for the sensor to detect a probe depends on the sensor’s settings, in particular, the read period and
aggregate count. This means that the time to auto detect a probe can fluctuate between 30 seconds or likely much longer.
To speed up the auto detect process of the sensor, press and hold the Bluetooth button on the top of the sensor for
five seconds after reconnecting the external probe. This will restart the sensor, and on startup the sensor will check for the
externally connected cable assembly.
If you continue to experience an issue, contact Laird Support. There could be damage to the Sentrius sensor or probe.
Figure 7: Front panel LEDs are lit

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The Sentrius mobile application allows a user to configure a device, troubleshoot a device, see real-time sensor data, and update
firmware. Search the appropriate app store (Google Play Store, Apple Store, or the Microsoft Store) for the Sentrius Sensor App
and install it on your device.
Note: This guide only contains a brief walkthrough. Refer to the RS1xx Guide for further details on sensor functionality and the
mobile app capabilities. To access the RS1xx Guide, navigate to the RS1xx product page, click Documentation, and
select the Sentrius RS1xx User Guide.
The Sentrius sensor mobile app displays real-time sensor data collected from the external temperature probes once a good cable
connection is established.
To view real-time sensor data, follow these steps:
Press the BLE button on the front panel of the sensor to start BLE advertising on the device.
Select the corresponding DEV EUI on the connection screen of the mobile app. The DEV EUI of the sensor can be found
on the back label of the sensor.
Once connected to the mobile app, click the Temperature Reading icon under the Temperature/Humidity section to
see real-time sensor data from the temperature probe.
From this screen, the temperature probe can be validated by confirming the temperature measurements are accurate.
Place your hand on the probe to fluctuate the temperature.
Figure 8: Sentrius sensor mobile app displays
Update the sensor settings on the main screen to define a shorter read interval if the temperature readings are taking too
long to update on the graph. The shortest read interval which can be defined thirty seconds (30s).

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A RS186 was configured for a read period of 300 seconds with an aggregate of three.
A power analysis was performed for 32 minutes to ensure two LoRa transmit events were captured.
Figure 9: RS186 power consumption
The average current consumption was 72uA over 32 minutes. The data rate that the RS186 transmitted at was SF7BW125.
Every external temperature probe is cleaned with an alcoholic wipe and placed in an individual bag before leaving the supplier.
A label is included with every bag warning the end-user to clean the probe before use.
It is up to the end-user to ensure that every temperature probe is cleaned and sanitary for consumer use prior to be deployed.
Laird Connectivity will not be held liable for any issues pertaining to the cleanliness of the probes.