Laird Sentrius RS1 Series User manual

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Version 1.1

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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

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1Introduction..........................................................................................................................................................................4
2Part Numbers ......................................................................................................................................................................4
3Installation ...........................................................................................................................................................................5
3.1 Illustrations.................................................................................................................................................................6
3.1.1 Stainless Steel Temperature Probe with RJ45 Cable Assembly..........................................................................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 the Laird External Temperature Probe kit for the Sentrius Sensor series and
view sampled data using the Sentrius Sensor Mobile App.
This variant of the Sentrius RS1xx series of LoRa / BLE Sensors enables use of an external cabled temperature probe, in place
of the integrated temperature sensor. The kit includes an IP67 rated cabled temperature probe that is 200mm in length and
6.35mm in diameter at the stainless-steel probe end. The external temperature probe utilizes a One Wire digital interface and
supports a general temperature range of -55° to +125°C (+/-0.9°C). The cabled probe connects into themain 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 with external temperature probe
Reference
Description
Left
IP67-rated, 1520 mm overall length,
213 mm probe length, 6.0 mm diameter
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 2 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 2: Installing the external temperature sensor
Note: Ensure that references (2) and (3) in Figure 2 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 3: Stainless steel temperature probe with RJ45 cable assembly

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(DIM in millimeters)
Figure 4: 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 will flashing either “orange” or “green” color to indicate the connection status to a network.
A connection problem at power up is indicated by both LEDs on the front panel both being constantly on. This is a visual indicator
to the user that there is a communication issue between the sensor and the probe. 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 guide for more
details RS1xx product page on this process.
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 Sentrius sensor will
check for the sensor.
The sensor monitors the status of the external probe on each temperature measurement. If the external probe is damaged
or disconnected it will be shown by the LoRa status LED. The LoRa status LED flashes at the heartbeat interval to indicate
a network connection. If the external probe becomes disconnected, the LoRa status LED will quickly flash orange three
times immediately after the heartbeat indication. When the external probe is reconnected, the heartbeat LED will return to
normal operation.
If you continue to experience an issue, contact Laird Support. There could be damage to the Sentrius sensor or probe.
Figure 5: 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 RS1xxGuide, 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 from the external temperature probe and sensor once a good cable
connection is established.
To view real-time sensor data, follow these steps:
Press and hold 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 6: Sentrius sensor mobile app displays
Update the sensor settings on the main screen to get a faster reading period if the temperature readings are taking too long
to update on the graph. The fastest read period a sensor can have is thirty seconds.

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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 7: RS186 power consumption
The average current consumption was 72 uA 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 before using the temperature probes. Laird will not be held liable for
any issues pertaining to the cleanliness of the probes.

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