FISCHER FT90 - Measuring Accuracy; Humidity

7 | Technical data FISCHER Mess- und Regeltechnik GmbH
94/108 BA_EN_FT90
Switch outputs
The assignment of the switch outputs to the channels can be configured freely.
Number of switch outputs 4
Type Potential-free semiconductor switch (MOS-
FET)
Progr. switching function 1-pole open contact (NO)
1-pole break contact (NC)
Max. switching voltage 3 to 32 V AC/DC
Max. switching current 0.25 A
Max. switching output 8 W / 8 VA
R
ON
≤ 4 Ω
7.4 Measuring accuracy
7.4.1 Humidity
ΔrH [%rH]
Max. measurement error
Typ. measurement error
Relative humidity [%rH]
Fig.139: Relative humidity measurement error in relation to relative humidity
ΔrH [%rH]
Temperature [°C]
±1.5
±2.0
Fig.140: Relative humidity measurement error in relation to temperature
Typical measurement error 1.5 to 2%rH
Maximum measurement error 2 to 3%rH
If the sensor is operated continuously with a humidity of over 80%rH, the meas-
urement error can exceed the specified maximum value after a certain period of
time.
Once the relative humidity drops below 80%rH, the sensor returns to its initial
state and the measurement error is again within the specified limits.