Elsys ERS CO2 LoRa

Compatibility

Compatible with EpiSensor Edge over LoRaWAN.

Register it on your LoRaWAN network server with its DevEUI and keys. Edge, on the Gateway, reads its decoded uplinks from that server.

Edge reads 11 values from it, listed under Interface.

Connect it with

• 
  Gateway ZGW-20
  From €899 ex VAT Configure Gateway

Specifications

The ERS CO2 LoRa is Elsys’s indoor climate sensor with a CO₂ cell. It measures CO₂ from 400 to 10,000 ppm to ±30 ppm ±3 % of reading up to 5,000 ppm, temperature to ±0.2 °C, relative humidity to ±2 % RH and light from 4 to 2,000 lx, and counts motion with a passive infrared sensor.¹

Power

Battery. One or two 3.6 V ER14505 AA lithium thionyl chloride cells; the ERS CO2 LoRa has two battery slots and Elsys recommends filling both. Up to 10 years depending on settings and environment.²

CO₂ range

400 to 10,000 ppm, 1 ppm resolution¹

CO₂ accuracy

±30 ppm ±3 % of reading (400 to 5,000 ppm); ±10 % of reading (5,001 to 10,000 ppm); at 15 to 35 °C and 0 to 80 % RH¹

Temperature

±0.2 °C accuracy, 0.1 °C resolution¹

Humidity

0 to 100 % RH, ±2 % RH accuracy, 1 % RH resolution¹

Light

4 to 2,000 lx, ±10 lx accuracy, 1 lx resolution¹

Motion

Passive infrared sensor¹

LoRaWAN

Version 1.0.4, Regional Parameters RP002-1.0.3; OTAA, ABP, ADR¹

Frequency plans

EU868, US915, AU915, AS923, KR920, IN865¹

Transmit power

14 dBm or 20 dBm depending on region¹

Operating conditions

0 to 50 °C, 0 to 95 % RH non-condensing, indoor¹

Enclosure

PC and ABS, IP20, 76.4 × 76.4 × 22.5 mm, 70 to 95 g with batteries¹

Article number

ERS2CO2¹

Where it is used

• Meeting rooms, classrooms and open-plan offices, where CO₂ and motion together show whether ventilation matches occupancy.

  Indoor environmental monitoring

• Demand-controlled ventilation, where room CO₂ shows when air handling units can run slower.

  HVAC energy monitoring for commercial buildings

• Libraries, shops and other public rooms, where the traffic-light LED shows people when a room needs air.

Interface

Device class

Class A⁴

Regional plans

EU868, US915, AU915, AS923, KR920, IN865

Activation

OTAA or ABP

LoRaWAN version

1.0.4

Ports

Decoded fields

Readings and settings, with units and ranges where Elsys publishes them. R readable, W writable only.^{1, 2, 3, 4}

Each measurement is one type byte followed by its value, and one uplink can carry several. The lower six bits of the type byte give the type; the upper two bits are used only when timestamped measurements are turned on. Multi-byte values are big-endian: 00 CD after type 01 is 20.5 °C.³

The uplink port can be changed; downlinks always go to the configured port plus one. The datasheet lists Class C as a configurable option, and the operating manual also lists the HK923 frequency plan.^1, 2, 4

Setup

1. Fit the batteries

   Fit two 3.6 V ER14505 AA lithium cells. If you fit only one, use slot A.²

2. Register it on the network server

   Add the sensor to the site’s LoRaWAN network server with its DevEUI, JoinEUI and AppKey for OTAA. The keys can be read and changed over NFC with the Elsys Sensor Settings app.²

3. Watch the join

   On start-up the LED blinks long red, then long green. Each join request is a short yellow blink: the sensor starts at SF7 every 15 seconds or so and slows down until it joins. A short green blink marks each uplink.²

4. Check the first uplinks

   After joining, the sensor sends its settings, then readings on port 5. Confirm the server decodes CO₂, temperature and humidity with an Elsys payload decoder.³

5. Mount it

   Mount it on a wall at 1.6 m with the ventilation slots vertical, out of direct sunlight and away from radiators, windows and air vents. Keep sensors apart, or their PIRs can trigger each other.²

Common questions

How is the CO₂ sensor calibrated?

It runs an automatic baseline correction every 8 days, which assumes the sensor sees fresh air (about 400 ppm) at some point in each period. A full correction needs three such periods, about a month. In rooms occupied around the clock, Elsys advises turning the automatic correction off and calibrating by hand in fresh air once a year: take the sensor outside for about 10 minutes.^2, 5

Which LoRaWAN ports does it use?

Port 5 for uplinks by default. Downlink settings go to the configured port plus one, so port 6 by default.⁴

How long do the batteries last?

Up to 10 years, depending on the sample and send periods, the data rate and the room. Elsys publishes a battery life calculator for specific settings. Two cells last longer than one.^2, 6

How does it report motion?

The PIR has four modes. Count reports the number of triggers since the last uplink; Trigger sends an uplink on each detection; Trigger Once sends one per report period; Occupancy reports a level from 0 to 2 that rises with motion and falls after a set time without it. After each detection and transmission the PIR ignores movement for 8 seconds.²