The Pressac Sensing CO2 Sensor needs to be commissioned before use. There are 4 stages to the commissioning process.


1. Selection of Sampling Rate

As the unit is designed to harvest energy from ambient light, it may be favourable (where applicable) to reduce the unit’s sampling frequency in prolonged low level light conditions. This can be set by configuring DIP switch 1 as below.


Light Status

Energy Supply

Sampling Rate

DIP Switch 1

Ambient light good

(Powered from solar)

Fixed (15 mins)

On

Ambient light poor

(Powered from stored energy)

Fixed (15 mins)

On

Ambient light poor

(Powered from battery)

Fixed (15 mins)

On

Ambient light good

(Powered from solar)

Dynamic (5 mins)

Off

Ambient light poor

(Powered from stored energy)

Dynamic (5 mins)

Off

Ambient light poor

(Powered from battery)        

Dynamic (15 mins)

Off

2. Calibration

The CO2 Sensor has been factory calibrated prior to supply. Like all CO2 sensors, it does need to update its calibration status periodically. In normal environments, background CO2 levels are typically 500ppm.

Auto Calibration ON/OFF

Auto calibration ON calibrates the reported background level of CO2 against the lowest measured values of CO2 taken over an 8 day period. Auto calibration is the preferred operating mode of the CO2 Sensor, however to maintain accuracy, there must be periods of low room occupancy (only background CO2 present) during the 8 day period.

Manual Calibration

When first installing and when auto calibration is not used, it is essential to recalibrate the units background CO2 level of 500ppm.


To recalibrate the default level of 500ppm, set DIP Switch 3 (manual calibration) and DIP switch 4 (battery backup) to ON and press the learn button for 5 seconds. The unit’s LED will flash once per second for approximately 4 minutes. During this time, take the unit to an unoccupied environment (the ambient CO2 level here should be approximately 500ppm). After the 4 minute period, the unit’s LED will flash quickly for a further 2 minutes while the recalibration process takes place. Once the LED has stopped flashing the units base CO2 level has been reset to 500PPM. Return DIP Switch 3 to the off position. Dip switch 4 can be left in the ON position if the battery backup function is required. Moving Dip switch 3 back to the OFF position during the procedure will abort the calibration process.


Operating Mode (Calibration)

DIP Switch 2

Dip Switch 3

Learn Button

Sensor auto calibrates every 8 days

ON

OFF

N/A

Sensor uses factory calibration level (500ppm)

OFF

OFF

N/A

Sensor uses recalibrated background level on completion

OFF

ON

Pressed

3. Connection Of Battery

Battery

Unit Status

Dip Switch 4

Not connected

Solar powered only

OFF

Connected

Solar + battery powered

ON


The unit is pre-installed with a non rechargeable 3.6v Lithium A type battery. To enable commissioning and provide battery back-up operation in continuously low level light conditions, the battery must be connected by switching DIP Switch 4 on.

4. Commissioning

There are 2 ways in which the unit can be commissioned.

Automatic Registration.

To commission the unit, depress and release the “Learn” button. The LED will blink once. The unit now transmits a learn telegram.

Manual registration.

Alternatively, the unit can be commissioned onto your EnOcean network manually. To do this you will need the unique EnOcean ID of the Pressac Sensing CO2 Sensor and also its EnOcean Equipment Profile. The EnOcean ID and the EEP are printed on the product label on the Pressac Sensing CO2 Sensor.

EnOcean Equipment Profile.

The product uses an EnOcean STM300 Module for transmitting the data wirelessly. It supports the following EEPs (EnOcean Equipment Profiles): A5-09-04