WIKA FSD-3 - Accuracy, Reference Conditions and Approvals

29WIKA operating instructions flow switch, model FSD-3
EN
14153887.01 09/2016 EN/DE/FR
Specications
Voltage supply
Power supply DC 15 ... 35 V
Current consumption
■
Switching output with analogue signal: 175 mA
■
Switching output without analogue signal: 150 mA
Total current consumption max. 650 mA including switching current
Accuracyspecications
Non-repeatability Flow (5 ... 100 cm/s): ±2 cm/s
Temperature: 0.5 K
Accuracy at reference conditions Flow (5 ... 100 cm/s): ≤ ±5 % of end value of measuring range
Flow (>100 ... 175 cm/s): ≤ ±10 % of end value of measuring range
Temperature: ≤ ±1,5 K
Including non-linearity, hysteresis, zero oset and end value deviation (corresponds to
measured error per IEC 61298-2).
The accuracy of the ow switch is dependent on the thermal conductivity and the contamination
of the probe.
Temperature error at -20 ... +85 °C
(-4 ... +185 °F)
≤ ±0.4 cm/s per K
Reference conditions
Ambient temperature 15 ... 25 °C (59 ... 77 °F)
Atmospheric pressure 860 ... 1,060 mbar (12.47 ... 15.38 psi)
Humidity 45 ... 75 % r. h.
Medium Water
Power supply DC 24 V
Mounting position Process connection M18 x 1.5 downwards
Inner diameter of pipe 26 mm
Upstream/Downstream pipe: 1 m / 0.5 m
Marking towards the upstream side twist of ±5°
Load 100 Ω
9.Specications