Elsys ERS2 Series ERS2 Lite User manual

Operating manual
Publish Date: 2023-01-30
v1.0
Wireless sensor
ElektronikSystem i Umeå AB Tvistevägen 48C, 90736 Umeå, Sweden
E-mail: [email protected] ǀWeb: www.elsys.se
Specifications in this document are subject to change without notice.
©ElektronikSystem i Umeå AB 2022
Operating manual
ERS2 series

Operating manual ERS2 series
ElektronikSystem i Umeå AB Tvistevägen 48C, 90736 Umeå, Sweden
E-mail: [email protected] ǀWeb: www.elsys.se
Important safety information
Read this manual before attempting to install the device!
Failure to observe recommendations included in this manual may be
dangerous or cause a violation of the law. The manufacturer, ElektronikSystem i
Umeå AB will not be held responsible for any loss or damage resulting from not
following the instructions of this operating manual.
•The device must not be dismantled or modified in any way.
•The device is only intended for indoor use. Do not expose it to moisture.
•The device is not intended to be used as a reference sensor, and
ElektronikSystem i Umeå AB will not be held liable for any damage
which may result from inaccurate readings.
•The battery should be removed from the device if it is not to be used for
an extended period. Otherwise, the battery might leak and damage the
device. Never leave a discharged battery in the battery compartment.
•The device must never be subjected to shocks or impacts.
•To clean the device, wipe with a soft moistened cloth. Use another soft,
dry cloth to wipe dry. Do not use any detergent or alcohol to clean the
device.
Disposal note in accordance with Waste from Electrical and
Electronic Equipment (WEEE) Directive 2012/19/EU
The device, as well as all the individual parts, must not be disposed of with
household waste or industrial waste. You are obliged to dispose of the device at
the end of its service life in accordance with the requirements of RoHS
2012/19/EU to protect the environment and to reduce waste through recycling.
For additional information and how to carry out disposal, please contact the
certified disposal service providers. The sensors contain a lithium battery, which
must be disposed of separately.

Operating manual ERS2 series
ElektronikSystem i Umeå AB Tvistevägen 48C, 90736 Umeå, Sweden
E-mail: [email protected] ǀWeb: www.elsys.se
Contents
1. Description ................................................................................................................1
1.1 Dimensions (mm) ..........................................................................................1
1.2 Label..................................................................................................................2
1.3 Main features of the ERS2 series ................................................................3
2. Mounting guidelines ................................................................................................4
2.1 Motion PIR........................................................................................................4
2.2 Room occupancy sensor ...............................................................................4
2.3 Sound level.......................................................................................................4
3. Installation .................................................................................................................5
4. Service and maintenance........................................................................................6
5. Sensor configuration................................................................................................7
5.1 NFC Configuration ..........................................................................................7
5.2 Over the air configuration..............................................................................8
5.3 Application parameters ..................................................................................8
6. Sensor behavior........................................................................................................9
6.1 Sensor startup .................................................................................................9
6.2 Sampling mode / Periodic measurement....................................................9
6.3 Scheduled transmission.................................................................................9
6.4 LED indication ..............................................................................................10
7. Internal sensors.....................................................................................................11
7.1 Temperature..................................................................................................12
7.2 Humidity.........................................................................................................12
7.3 Light ...............................................................................................................13

Operating manual ERS2 series
ElektronikSystem i Umeå AB Tvistevägen 48C, 90736 Umeå, Sweden
E-mail: [email protected] ǀWeb: www.elsys.se
7.4 CO2................................................................................................................13
7.5 Motion PIR.....................................................................................................13
7.5.1 PIR Lens detection pattern................................................................14
7.6 Room occupancy (ERS2 Eye)...................................................................15
7.6.1 Detailed description............................................................................15
7.6.2 Special functions for ERS2 Eye........................................................15
7.7 Sound level....................................................................................................16
7.8 VOC ................................................................................................................16
8. Device specifications ............................................................................................17
9. Sensor payload format.........................................................................................18
10. Regulations........................................................................................................18
10.1 Legal Notices................................................................................................18
10.2 Declaration of conformity ...........................................................................18
11. Revision History ................................................................................................19

Operating manual ERS2 series
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ElektronikSystem i Umeå AB Tvistevägen 48C, 90736 Umeå, Sweden
E-mail: [email protected] ǀWeb: www.elsys.se
1. Description
The ERS2 series of sensors are universal LoRaWAN®indoor climate sensors.
The sensor measures, depending on model, temperature, humidity, light
intensity, CO2-level, sound-level, volatile organic compounds (VOC), occupancy
and detects motion. ERS2 is a battery-powered device and is designed to be
wall-mounted. The sensors are equipped with NFC (Near Field Communication)
for easy configuration with an NFC-enabled smartphone.
1.1 Dimensions (mm)
LED Motion detector
Light sensor

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ElektronikSystem i Umeå AB Tvistevägen 48C, 90736 Umeå, Sweden
E-mail: [email protected] ǀWeb: www.elsys.se
1.2 Label
At the back of your device there is a label with an Aztec barcode containing
DevEUI and sensor type.

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ElektronikSystem i Umeå AB Tvistevägen 48C, 90736 Umeå, Sweden
E-mail: [email protected] ǀWeb: www.elsys.se
1.3 Main features of the ERS2 series
•Compatible with LoRaWAN®specification 1.0.4
•Measures ambient temperature
•Measures ambient humidity
•Measures light intensity*
•Measures CO2 level*
•Measures sound level*
•Measures VOC level*
•Detects room occupancy*
•Detects motion using a passive IR sensor*
•Indicates low, normal or high values with an LED light*
•Easy installation
•Easy configuration
•May be installed on a wall or any (non-metallic) surface
•Battery-powered
•Long-range communication
•Configurable over NFC
•Configurable over the air
•Ten years of battery life**
•Supported channel plans: EU863-870, IN865, US902-928, AU915-
928, AS923, KR920-923, HK923
•CE Approved and RoHS compliant
* Depending on model
** Depending on settings and environmental factors

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ElektronikSystem i Umeå AB Tvistevägen 48C, 90736 Umeå, Sweden
E-mail: [email protected] ǀWeb: www.elsys.se
2. Mounting guidelines
Common mounting guidelines for ERS2 line of sensors:
•Place the sensor in an open space on the wall, with an installation
height of 1.6 meters (does not apply to ERS2 Eye, see 4.2).
•For best RF and measurement performance, make sure you mount the
sensor with the ventilation openings vertically.
See installation in chapter 2.
•Make sure that the sensor is not placed in direct sunlight, close to
heating vents, near windows, air ventilation where it may measure
values that is not representative for the rest of the room.
2.1 Motion PIR
The PIR can self-trigger if sensors are placed too close to each other. Keep this
in mind when you mount or test the sensors.
2.2 Room occupancy sensor
The Grid Eye sensor has an 8x8 temperature matrix with a field of view of 60°
and a range of 5 meters for detecting humans. Keep this in mind when you
place the sensor and make sure that you have enough sensors to cover your
whole desired area. Preferably place the ERS Eye in the ceiling at between 2.2
to 5 meters height. Do not place the sensor so it faces windows or moving heat
sources as this can cause a false positive reading.
2.3 Sound level
Think carefully about the placement of the ERS2 Sound. If the sensor is placed
close to loud sources such as machines or ventilation, it will be reflected in the
sensor readings due to sounds being louder close to the source.

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ElektronikSystem i Umeå AB Tvistevägen 48C, 90736 Umeå, Sweden
E-mail: [email protected] ǀWeb: www.elsys.se
3. Installation
1. Remove the back panel of the sensor by gently prying the tab with a
small screwdriver.
2. Install the batteries. The ERS2 requires one or two AA batteries. The
battery type is 3.6V Lithium Battery (ER14505). You can use one
battery, but it’s recommended that you use two for best battery life.
Use battery slot A if only one battery is used.
Caution: Using batteries other than the ones provided may result in loss of performance,
battery life, and also damage to the device. Dispose of properly, observing
environmental protection rules.
A
B

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ElektronikSystem i Umeå AB Tvistevägen 48C, 90736 Umeå, Sweden
E-mail: [email protected] ǀWeb: www.elsys.se
3. Mount the back panel securely to the wall with at least 2 appropriate
screws, using some of the four mounting holes. Alternatively, attach the
sensor with double sided adhesive tape.
4. Attach the sensor part by hinging it on the back panel.
4. Service and maintenance
No serviceable parts inside. If service is needed other than battery replacement,
please contact your distributor.

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ElektronikSystem i Umeå AB Tvistevägen 48C, 90736 Umeå, Sweden
E-mail: [email protected] ǀWeb: www.elsys.se
5. Sensor configuration
All sensor settings can be configured via a smartphone application with NFC
(Near Field Communication) or over the air via the network server and downlink
data to the sensor. The sampling rate, spreading factor, encryption keys, port,
and modes can be changed. All sensor settings can be locked from the server or
NFC to make end-users unable to read or change settings on the sensor.
5.1 NFC Configuration
1. Download ELSYS “Sensor Settings”application from Google Play or App
store and install it on a smartphone or tablet. The device must support NFC.
2. Enable NFC on the device and start the application.
3. Place your device on top of the NFC antenna on the sensor. Keep the two
devices close to each other and don’t move them to get as good
connectivity as possible.
4. Remove the device. Current settings will be displayed in the application.
5. Use the application to change any settings if needed.
6. Tap the device on top of the NFC antenna to transfer the new settings to
the sensor. Make sure that the application confirms your new settings.
7. Wait for the sensor to reboot (1 sec), indicated by the LED flashing. Sensor
settings have been updated. Always validate your settings by reading the
NFC data after the sensor has restarted.
NFC-
antenna
location

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ElektronikSystem i Umeå AB Tvistevägen 48C, 90736 Umeå, Sweden
E-mail: [email protected] ǀWeb: www.elsys.se
5.2 Over the air configuration
All settings may be configured over the air via your LoRaWAN®infrastructure.
Please visit the support section on our webpage for more information regarding
downlink protocol.
5.3 Application parameters
All parameters for the “Sensor settings” application can be found in our settings
document. Please visit the support section on our webpage for more information.

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ElektronikSystem i Umeå AB Tvistevägen 48C, 90736 Umeå, Sweden
E-mail: [email protected] ǀWeb: www.elsys.se
6. Sensor behavior
6.1 Sensor startup
1. When the sensor starts up it loads any configuration parameters written to the
NFC chip. The sensor will then write all configuration parameters back to the
NFC chip.
2. When the configuration is done the sensor tries to join the network if OTAA
(Over the Air Activation) is enabled. Make sure that the sensor credentials
(DevEUI, AppKey, JoinEUI) match the keys added in the server for activation of
the device. The join procedure starts at spreading factor 7 with a join request
every ~15 seconds. The sensor will gradually increase the time as well as the
Spreading Factor between the following join requests until the join is successful.
Every join request is indicated by a yellow LED blink.
3. After successful connection to a network, the sensor sends an uplink
containing the sensor settings and enters sampling mode.
6.2 Sampling mode / Periodic measurement
The sensor makes periodic measurements according to the user configuration.
6.3 Scheduled transmission
The sensor transmits data according to the user configuration. However, the
configured sending interval can be overridden by network limitations. Due to this,
the spreading factor and sending interval settings might result in longer intervals
than intended.

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ElektronikSystem i Umeå AB Tvistevägen 48C, 90736 Umeå, Sweden
E-mail: [email protected] ǀWeb: www.elsys.se
6.4 LED indication
The LED, located in the bottom right corner, indicates different actions when the
sensor is active.
LED indication
Action
Long red blink, long green blink
Sensor is starting up
Short yellow blink
LoRa join request transmission
Short green blink
LoRa uplink transmission
Short red blink
Sensor failed to send an uplink
Common cause is duty cycle limits
Long blue blink
Sensor has loaded new configuration
from NFC

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ElektronikSystem i Umeå AB Tvistevägen 48C, 90736 Umeå, Sweden
E-mail: [email protected] ǀWeb: www.elsys.se
7. Internal sensors
The populated internal sensors in the ERS2 series differ between models
according to the list below.
ERS2
ERS2
Lite
ERS2
CO2
ERS2
CO2 Lite
ERS2
Eye
ERS2
Sound
ERS2
VOC
Temperature
Humidity
Light
Motion PIR
CO2
Room
occupancy
Sound level
VOC
NFC

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ElektronikSystem i Umeå AB Tvistevägen 48C, 90736 Umeå, Sweden
E-mail: [email protected] ǀWeb: www.elsys.se
7.1 Temperature
Resolution: 0.1 °C
Accuracy: 0.2 °C typical, see figure
7.2 Humidity
Resolution: 1 % RH
Accuracy at 25 °C: ±2 % RH, see figure
Accuracy of RH over temp.: See figure

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ElektronikSystem i Umeå AB Tvistevägen 48C, 90736 Umeå, Sweden
E-mail: [email protected] ǀWeb: www.elsys.se
7.3 Light
The light sensor sits behind the PIR lens. For correct reading, make sure it isn’t
obstructed. Accuracy can depend on angle of light source.
Range:0-65535 lux
Accuracy: ± 10 % or ± 10 lux, whichever is greater.
7.4 CO2
The CO2 sensor normally runs an automatic baseline correction algorithm
(ABC), with a period of 8 days. For a fully corrected measurement, the ABC
needs 3 consecutive 8-day periods where the sensor sees fresh air (400 ppm)
sometime during each ABC period. It can also be calibrated manually, and the
ABC can be turned off. In this case it is recommended to do a manual calibration
in fresh air once/year.
Range: 400-10000 ppm
Accuracy:
400-5000 ppm: ±30 ppm, ±3 % of reading (15-35 °C, 0-80 % RH)
5001-10000 ppm: ±10 % of reading (15-35 °C, 0-80 % RH)
7.5 Motion PIR
Motion detection range. Actual range of the sensor can be influenced by
environmental conditions. See mounting guidelines in chapter 4.
Note: The PIR has a blanking time of 8 seconds right after motion event and transmission. Any
movements during this time will be ignored .

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ElektronikSystem i Umeå AB Tvistevägen 48C, 90736 Umeå, Sweden
E-mail: [email protected] ǀWeb: www.elsys.se
7.5.1 PIR Lens detection pattern
Lens for ERS2, ERS2 CO2, ERS2 Sound and ERS2 VOC (wall mount)
Lens for ERS2 Eye (ceiling mount)
From side
From side
From top
From top

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ElektronikSystem i Umeå AB Tvistevägen 48C, 90736 Umeå, Sweden
E-mail: [email protected] ǀWeb: www.elsys.se
7.6 Room occupancy (ERS2 Eye)
The room occupancy algorithm uses both the PIR sensor and an 8x8 pixel heat
map sensor. If the PIR triggers, occupancy is detected. If the PIR doesn’t trigger,
the heat map is enabled, and its pattern is compared to a filtered mean value of
the room. If there is a big enough difference between the two, occupancy is
detected. Please allow for up to 24 hours for the algorithm to stabilize after
installation.
7.6.1 Detailed description
When the PIR is triggered, room occupancy is set to 1. If no other motion is
detected within 5 minutes, the sensor captures a heat map image. Room
occupancy is set to 2 if heat signatures are detected, otherwise, room
occupancy is set to 0 and a new background image is calibrated.
Whenever the occupancy value is changed, the ERS2 Eye will trigger a
transmission. No triggered transmission will be done as long as the occupancy
value remains unchanged. Periodic transmissions will send all values, including
occupancy.
Examples of occupancy values:
•Occupancy 0: Unoccupied.
•Occupancy 1: Occupied. Occupancy detected by motion.
•Occupancy 2: Occupied. Occupancy detected by heat signatures.
Heat map viewing angle: 60°x60°
Heat map accuracy (typical): ± 2.5°C
7.6.2 Special functions for ERS2 Eye
Hot spot: Reports highest temperature pixel.
Raw data: Reports all 8x8 pixel temperature data.
Note: The heat map will also detect other warm objects (e.g., laptops). Warm objects that stay in
the same place will eventually be calculated into the background image.

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7.7 Sound level
The sound level sensor continuously measures the average and peak sound
pressure level with no missing events. The analog part is always on, with a peak-
hold circuit for peak level, and a mean-value filtering for average value. The
digital part wakes and samples both signals every 10 s and does the final
calculation before sending the data at the desired send interval.
Average value range: 31 –75 dB SPL
Peak value range: 59 –100 dB SPL
Filtering: dBA
Sound resolution: 1 dB
Sound accuracy: ±5 dB
10s sample and peak reset. For every send interval, the ERS Sound calculates
total peak and average for all samples. Red = peak, yellow = average.
7.8 VOC
Resolution:
0 ppb –2008 ppb: 1 ppb
2008 ppb –11110 ppb: 6 ppb
11110 ppb –60000 ppb: 32 ppb
Accuracy: 15 % of measured value (typical), 40% (max)
Measurement range: 0 –60000 ppb TVOC