# Sensors
Instruments can have a set of sensors to capture information about the environment and supplement measurements. This set can differ between instruments. Find the configuration and available sensors under Instruments (for example, MultispeQ v2.5 and v2.0).
TIP
The light detectors used together with LEDs to perform spectroscopic measurements are not listed here. Please find them in the chapter about Detectors.
# Add a Sensor
When writing a protocol, the sensors that are supposed to be included into a measurement go into the array of environmentals. Each sensor is added in the array notation. The first element of each array is the sensor name, the following ones are additional parameters for using the sensor.
...
"environmentals": [
[ "sensor A" ],
[ "sensor B" ],
...
]
...
# Sensor Commands
| Command | Data Returned |
|---|---|
light_intensity | Light intensity in µmol photons × s⁻¹ × m⁻² (PAR) |
previous_light_intensity | Light intensity from previous measurement (only in _protocols_set_) |
temperature_humidity_pressure | Temperature (℃), rel. humidity (%), barometric pressure (mbar) - (sensor #1) |
temperature_humidity_pressure2 | Temperature (℃), rel. humidity (%), barometric pressure (mbar) - (sensor #2) |
contactless_temp | Contactless Temperature (℃) |
thickness | Thickness (µm - microns) |
thickness_raw | Thickness (raw values) |
compass_and_angle | Roll, pitch, angle and cardinal direction |
The available sensor commands are shown in the Protocol Editor when an instrument is connected. Select Instrument from the editor toolbar to open the instrument configuration. Double-click a sensor to insert its command at the current cursor position.
# Calibration
Not all sensors in PhotosynQ instruments need to be recalibrated like the contactless temperature sensor. They come factory calibrated. In case they do require re-calibration, like the PAR sensor, you will find instructions under Instrument Calibrations.
Sensor Acclimation
Sensors like the temperature, rel. humidity and barometric pressure sensor need to acclimate to provide the correct ambient measurements. So when taking the instrument into an environment that is very different from the one it was stored in, make sure to provide an appropriate amount of time for acclimation.