Diagnostic values - PR-21-S

The values at the left of the graph are used for diagnostic purposes:

• CONC is the final concentration value including field calibration adjustment, see Figure 1.
• TEMP, see Temperature measurement.
• CCD gives the position of the shadow edge on CCD in %.
• nD is the refractive index value n_D from the sensor.
• CALC is the calculated concentration value without field calibration adjustment, Field calibration.
• QF or Quality Factor is a value in the range of 0 to 200. The QF value depends on process medium optical properties. A typical good value is 100, but there are process media where 50 is acceptable. The QF value should stay constant during the process. Falling QF value may indicate prism coating.
• LED is a measure of the amount of light from the light source in %.
• HD TMP is the sensor head temperature, see Temperature measurement.
• HD HUM is the sensor head humidity, see Sensor head humidity.
• I_SNS value shows the current to sensor, the nominal value is 40 mA.
• DTR TMP is the indicating transmitter temperature, see Temperature measurement.
• DTR V1 gives the voltage from the power module, the nominal value is 24 V.
• DTR V2 gives the DC supply voltage, the nominal value is 3.3 V.