WIKA PSD-4 Betriebsanleitung Seite 28

9. Specifications
Specifications
Switching current
EN
Settling time/response time
Service life
Voltage supply
Power supply
Current consumption
Total current consumption
Accuracy specifications
Accuracy, analogue signal
Non-repeatability, analogue signal
Long-term drift, analogue signal
Turndown, analogue signal
Accuracy, switching output
Temperature error in rated
temperature range
Temperature coefficients in rated
temperature range
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max. 250 mA
Analogue signal: ≤ 5 ms
Switching output: ≤ 5 ms
100 million switching cycles
DC 15 ... 35 V
The power supply for the pressure switch must be made via an energy-limited electrical circuit
in accordance with section 9.3 of UL/EN/IEC 61010-1 or an LPS to UL/EN/IEC 60950-1 or
class 2 in accordance with UL1310/UL1585 (NEC or CEC). The voltage supply must be suita-
ble for operation above 2,000 m should the pressure switch be used at this altitude.
max. 45 mA for versions without 4 ... 20 mA output signal
max. 70 mA for versions with 4 ... 20 mA output signal
max. 600 mA including switching current
≤ ±0.5 % of span
Including non-linearity, hysteresis, zero offset and end value deviation (corresponds to
measured error per IEC 61298-2).
≤ 0.1 % of span (IEC 61298-2)
≤ ±0.1 % of span (IEC 61298-2)
≤ ±0.2 % of span (IEC 61298-2) for measuring ranges ≤ 0.6 bar (10 psi), flush process connec-
tion, increased overload safety
The analogue output signal is freely scalable within the range of 5:1
When setting turndown, there is a proportional increase in the measuring deviation and
temperature error.
≤ ±0.5 % of span
maximum: ≤ ±1.5 % of span
maximum: ≤ ±2.5 % of span for increased overload safety and flush versions
Mean TC zero point
Mean TC span
WIKA operating instructions pressure switch, model PSD-4
≤ ±0.16 % of span/10 K
≤ ±0.16 % of span/10 K