The Consibio H2S sensor is engineered for robustness and long-term stability. In most applications it is not required to calibrate the sensor more than once or twice pr. year during service (which is part of the optional service agreement for the sensor).
However, for applications that require the highest level of precision, it is possible to calibrate the sensor whenever it’s desired. This guide describes how to do that.
Preparations
Activate Deploy Mode
The first thing to do when arriving on the site of installation is to activate Deploy Mode on the Logger:
- Press “Restart” shortly
-
Hold “Deploy Mode” for approximately 5s.
When the LEDs flash quickly one at a time in a repeating pattern, Deploy mode is activated.
For the next 1 hour, the device will make a measurement every 30s and transmit every 5mins.
After 1 hour, it will revert to the transmission and measurement interval configured in Consibio Cloud.
We activate this as the first step to make the Logger start measuring immediately and send the data with minimal delay.
Apply calibration standard
Ensure a stable baseline
When the sensor is initially connected, it takes a little time before it reaches equilibrium. If the sensor was just connected to a Logger, or the Logger was just powered up, wait at least 10mins. If the sensor has been connected for long and the Logger is powered up, skip this step.
Apply gas from gas cylinder with calibration standard
If a cable hanger is attached, this needs to be removed first.
Next, attach the calibration header to the sensor. Calibration headers are available on request (support@consibio.com). Connect a tube between the calibration header and a gas cylinder with a suitable calibration standard (eg. 500 ppm H2S in air or 50 ppm H2S in air). We recommend using a regulator with a fixed gas flow between 0.2 and 0.5 L/min during calibration.
Open the valve on the gas cylinder and set a timer for 10 minutes while the sensor is measuring the calibration gas. Be sure to do this in a well ventilated area as H2S is highly toxic. Be sure to do it outdoors or in a suitable fume hood.
Turn off gas
After 10mins, turn off the gas and disconnect the sensor from the calibration header. Move the sensor into fresh air and wait another 10 minutes while it collects a zero-point measurement. If you only wish to do a 1-point calibration, this step can be omitted in respect of time.
Update sensor configuration
Go to the Consibio Cloud dashboard on https://v3.consibio.cloud and login to the project where the Logger is located. Go to the “installations” tab and click on the “H2S” parameter on the given location:
Click on “Calibrate”:
Click on “Enter calibration points”:
Select a time range in the chart, that covers when the calibration was performed:
Mark the calibration points and enter the calibrated values:
Finally, click on the green “Confirm” button in the top right corner. Now, the calibration information will automatically be synchronized to the Logger which will save the calibration inside the sensor. Subsequent readings will thus be based on the applied calibration.
If you have any questions, please reach out to us at support@consibio.com