pyroscience Pico-pH-SUB, Manual

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Pico-pH-SUB | Manual
© PyroScience GmbH 20
R
1…
R
17
The results of the measurement given as 17 values. The most important
result values are highlighted.
Name Unit Description
R1 dphi m° Phase shift of optical measurement (raw
data)
R2-R4 -reserved-
R5 tempSample 0.001 °C Sample temperature (typ. external Pt100
sensor)
R6 tempCase 0.001 °C Case temperature (internal T-sensor within
module)
R7 signalIntensity 0.001 mV Signal intensity of the optical measurement
R8 ambientLight 0.001 mV Ambient light entering the sensor
R9 pressure 0.001 mbar Ambient air pressure
R10 humidity 0.001 %RH Relative humidity within the module
housing
R11 resistorTemp 0.001 Ohm Resistance of the temperature sensor (raw
data)
R12-
R13 -reserved-
R14 ph 0.001 pH value measured by optical pH sensors
R15-
R17 -reserved-
This command is the essential command for triggering measurements. If the input
parameter S is requesting several sensor types to be measured, the optical pH
measurement ("optical channel") is always performed as the last measurement. This
ensures that for enabled automatic temperature compensation the sample temperature
measurement (typ. external Pt100) is done before it is then used for compensating the
pH measurement.
IMPORTANT : If automatic temperature compensation is enabled for the optical sensor, it
is mandatory to enable Bit1 of the input parameter S!
The output parameters pH and tempSample give the results of the pH measurement and
of the temperature measurement (typ. external Pt100).
The output parameter signalIntensity is a measure of the signal quality ("signal intensity")
of the connected optical pH sensor. As a rule of thumb, typical values will be in the
range of 20-500 mV. Low signal intensities (<50 mV) might lead to noisy pH
measurements. A low signal intensity might be an indicator that the pH sensor is not
configured optimally and/or that the pH sensor is "worn out"/depleted and has to be
replaced. Please note, that the signal intensity is also dependent on the actually
measured pH value. Low pH values have a high signal intensity, high pH values have a
lower signal intensity.
The output parameter ambientLight is a measure how much ambient infrared light is
entering the pH sensor. In principle, such ambient light is not influencing the pH
measurement. However, excess ambient light might lead to a saturation of the optical