Decentlab DL-IAM

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 12 values from it, listed under Interface.

Connect it with

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

Specifications

The DL-IAM puts seven sensors in one wall-mounted box: an NDIR CO₂ sensor for 0 to 10,000 ppm, a metal-oxide VOC sensor for total VOC from 0 to 60,000 ppb, temperature and humidity sensors, a barometric pressure sensor, a two-channel ambient light sensor and a passive infrared motion sensor. Decentlab rates CO₂ at ±50 ppm or ±3 % of reading, temperature at ±0.2 °C and humidity at ±2 % RH, typical.¹

Power

Battery. Two alkaline AA (LR6) cells. About 1.4 years at SF7 and 0.9 years at SF12; 2.7 and 1.2 years with the VOC sensor off. The device runs until the cells fall to 2.0 V; always change both together.¹

CO₂

NDIR, 0 to 10,000 ppm, ±50 ppm or ±3 % of reading (10 to 40 °C, 20 to 60 % RH; ±10 % above 2,000 ppm)¹

Total VOC

Metal oxide, 0 to 60,000 ppb, ±15 % of reading, 1.3 % drift per year¹

Temperature

-40 to 125 °C, ±0.2 °C typical¹

Humidity

0 to 100 % RH, ±2 % RH typical¹

Barometric pressure

300 to 1,100 hPa, ±1 hPa typical¹

Ambient light

Up to 100,000 lx, ±30 % typical depending on light source and angle¹

Motion

PIR activity counter, 94° horizontal and 82° vertical, 5 m¹

Sampling and upload

30 s sampling (CO₂ 120 s), 10 min upload¹

LoRaWAN

Class A; OTAA, ABP, ADR; 14 dBm transmit power, -146 dBm sensitivity¹

Order codes

DL-IAM-001-EU868, DL-IAM-001-US915, DL-IAM-001-AS923, DL-IAM-001-AU915¹

Operating conditions

-10 to 50 °C, 0 to 95 % RH non-condensing¹

Enclosure

White ABS wall-mount, 120 × 80 × 27 mm, 144 g with batteries¹

Where it is used

• Offices, classrooms, hospitals and shops, where CO₂ and VOC show air quality and the PIR count shows how busy the room is.

  Indoor environmental monitoring

• Demand-controlled ventilation and heating, where room CO₂ and occupancy show when air handling can be turned down.

  HVAC energy monitoring for commercial buildings

• Greenhouses, mushroom farms and incubators, where CO₂, humidity and temperature drive the process.

Interface

Device class

Class A²

Regional plans

EU868, US915, AS923, AU915

Activation

OTAA or ABP

Default uplink interval

10 minutes (20 samples of 30 s averaged)

Ports

Decoded fields

Readings and settings, with units and ranges where Decentlab publishes them.¹

Each message starts with a 5-byte header: protocol version (2), a 16-bit device ID and 16 flag bits. Flag n set means sensor block n follows. Values are big-endian 16-bit integers, converted as in the table; a message can be as short as the header and the battery voltage.¹

Illuminance is worked out from the two light channels: the larger of (CH0 - 1.64 × CH1) × 1.5504 and (0.59 × CH0 - 0.86 × CH1) × 1.5504, in lux. Decentlab says it is not a precision lux meter.¹

Setup

1. Fit the batteries

   Insert two fresh, identical alkaline AA (LR6) cells into the holder on top of the sensor unit.¹

2. Register it on the network server

   Add the DL-IAM to the site’s LoRaWAN network server with its keys for OTAA, and load Decentlab’s DL-IAM decoder for the version 2 message format.¹

3. Switch it on

   Press and hold the button for 3 seconds until the LEDs fade in and out. In active mode the green LED flashes at each measurement, and the device tries to join up to three times per sampling period until it succeeds.¹

4. Test the link

   Press the button for 1 second to enter test mode (blue LED on), which sends as fast as possible and returns to active mode after 20 minutes. Two green flashes after a transmission mean it was sent; four mean it failed.¹

5. Leave the periods alone

   Keep the 30-second sampling period and the send period at their defaults. Changing the sampling period invalidates the VOC sensor’s calibration.¹

Common questions

Does the CO₂ sensor need calibrating?

Not by hand. Every 8 days it recalibrates from the readings of the last 8 days, on the assumption that the room got fresh air at 400 ppm for a few minutes in that time. The period can be changed, or the routine turned off, with the command set param 2.¹

How long do the batteries last?

About 1.4 years at SF7 and 0.9 years at SF12 on two alkaline AA cells, including self-discharge. With the VOC sensor turned off that rises to 2.7 and 1.2 years.¹

Can the reporting interval be shortened?

Decentlab advises against it. The 30-second sampling period must not change, or the VOC calibration becomes invalid, and it recommends leaving the 10-minute send period too.¹

Why is a value missing from some messages?

Each message carries flag bits that say which sensor blocks are included, so a message can leave a sensor out, for example the CO₂ block. A decoder must read the flags rather than assume fixed positions.¹

Which LoRaWAN port does it use?

Port 1 for uplinks by default, which can be changed from 1 to 223 on firmware 1.6.0 and later. Downlink commands go on port 1.²