18
WIKA operating instructions pressure transmitter, model IS-3
14243628.02 10/2018 EN/DE
EN
3. Specifications
3.5 Reference conditions (per IEC 61298-1)
Temperature:
15 ... 25 °C [59 ... 77 °F]
Atmospheric pressure:
860 … 1,060 mbar [12.5 ... 15.4 psi]
Air humidity:
45 ... 75 % r. h., non-condensing
Mounting position:
Calibrated in vertical mounting position with process connection facing downwards.
Power supply U+:
DC 24 V
3.6 Time response
Settling time:
≤ 2 ms (≤ 10 ms, for medium temperatures below -30 °C [-22 °F])
3.7
Accuracy specifications
Accuracy at reference conditions
0.50 % of span
Optional: 0.25 % (only for measuring ranges ≥ 0.25 bar [10 psi] and ≤ 1,000 bar
[1,000 psi])
Including non-linearity, hysteresis, zero offset and end value deviation (corres
-
ponds to measured error per IEC 61298-2).
Non-linearity (IEC 61298-2)
≤ 0.2 % of span BFSL
Non-repeatability
≤ 0.1 % of span
Mean temperature coefficient of zero
point (0 ... 80 °C [32 ... 176 °F])
Measuring range ≤ 0.25 bar: ≤ 0.4 % of span/10 K
Measuring range > 0.25 bar: ≤ 0.2 % of span/10 K
Mean temperature coefficient of span
(0 ... 80 °C [32 ... 176 °F])
≤ 0.2 % of span/10 K
Long-term stability at reference
conditions
≤ ±0.2 % of span/year
Adjustability of zero point and span
Adjustment is made using potentiometers inside the instrument.
Zero point and span: ±5 %
For use of the pressure measuring instrument in hydrogen applications, observe the Technical
information IN 00.40 at www.wika.com regarding long-term drift.