The CO2 level monitored is used as a proxy to justify the ventilation adequacy in the COVID-19 situation:
If the CO2 level is above 800 ppm, the ventilation may not be sufficient;
If the CO2 level is above 1100 ppm, the ventilation level is insufficient according to Singapore Standard SS554:2016.
Delta Ohm HD50 web data logger was used for this application. The model selected was HD50G1NBTV. It has built-in probes for CO2, temperature, and humidity measurement.
The instrument can meet all requirements specified by NEA/BCA. It also automatically uploads the data to Delta Ohm cloud via ethernet or wifi. Shown below are the results displayed in the cloud portal.
The instrument was pre-configured by OTM. The end user just needed to do the last-step mechanical mounting. All authorized users can access the results at the cloud portal with a browser and it is very convenient for facility managers who are busy with many things.
The instrument measures 3 velocity components (u, v, w velocity components) and 3 additional quantities (temperature, humidity, and barometric pressure), and calculates a number of derived quantities (wind speeds and directions, sonic temperature, and wind gust), as shown in the screen capture below:
For more details, please expand one of the blocks below.
The gloss meter uses 1 piece of AA-size battery. The typical battery life is around 58 hours (alkaline battery; without backlight and BlueTooth).
There are just 3 simple steps to perform gloss measurement:
1. Power on
Long press the “ON/OFF” button to switch on the gloss meter
There is a calibration board in the base holder of the gloss meter (shown above). Mount the gloss meter to the base holder and buckle it properly.
Short press the “Calibration” button. While the “CA” symbol is flashing, short press the “Calibration” again. The “CA” symbol disappears and the gloss meter is calibrated.
3. Gloss measurement
Take out the gloss meter from its base plate. Attach the measurement port (at the bottom of the gloss meter) to the surface to be measured. The gloss result is displayed on the screen, without pressing any button.
The following good practice practices are recommended:
Keep the calibration board and the lens in the measurement port clean.
Re-calibrate the gloss meter frequently.
Smartphone controlled gloss measurement
It is possible to perform online gloss measurement with a smartphone (both Android and iOS) via BlueTooth connection and store the gloss measurement results in the smartphone.