Input (Continuation)
Resistance to low pressures (vacuum resistance)
to 10 mbar
absolute
(0.15 psia)
Adjusting the span (turn down)
to TD 10:1 (see also this page figure 2)
Zero point increase and
Analogue
decrease
Smart
PROFIBUS-PA
– ±10% within extended measurement limits
– any within extended measurement limits
– any within extended measurement limits
(see also this page figure 1)
Output
Analogue signal 4…20 mA (analogue electronics)
Output signal
4…20 mA
Signal on alarm
Signal overrun (>20.5 mA) or underrun (<3.6 mA)
Integration time (damping)
Directly on instrument using DIP switches,
switch position "off": 0 s; "on": 2 s
4…20 mA with HART protocol (Smart electronics)
Output signal
4…20 mA with HART protocol
Resolution
1
µ
A
Signal on alarm
optional 3.6 mA, 22 mA or "continue" (last current value will
be held)
Integration time (damping)
Directly on instrument using DIP switches,
switch position "off": 0 s; "on": 2 s
or with Universal HART Communicator DXR 275
or using operating program e.g. Commuwin II: 0…40 s
PROFIBUS-PA (PROFIBUS-PA electronics)
Output signal
Digital communication signal PROFIBUS-PA (Profile 3.0)
PA function
Slave
Transmission rate
31.25 kBit/s
Response time
Slave: approx. 20 ms
PLC: 300…600 ms for approx. 30 transmitters
(depending on segment coupler)
Integration time (damping)
0…40 ms via communication
Communication resistance
none, PROFIBUS-PA termination-resistor
Physical layer
IEC 61158-2
Accuracy
Reference conditions
DIN IEC 770 T
U
=25°C (+77°F)
Accuracy data adopted after entering "Low sensor
calibration" and "High sensor calibration" for lower
range-value and upper range-value.
Linearity including hysteresis and reproducibility
(based on the limit point method to DIN IEC 770)
±0.2% of set span***
Linearity at low absolute pressure ranges (due to
performance limits of currently available DKD
calibration rigs)
for
≥
40 mbar
absolute
to <100 mbar
absolute
:
±0.3 % of set span***
Warm-up time
Analogue
Smart
PROFIBUS-PA
– 200 ms
– 1 s
– 1 s
Rise time (T90 time)
Analogue
Smart
PROFIBUS-PA
– 60 ms
– 220 ms
– 220 ms
Settling time
Analogue
Smart
PROFIBUS-PA
– 180 ms
– 600 ms
– 600 ms
Long-term drift
(with reference to the set span***)
±0.1% per year
±0.25% per 3 years
Thermal effects
– with reference to the set span***
– Applies to transmitters without diaphragm seals or
capillary tubes, see also "Temperature Effects"
page 12.
Analogue electronics:
– for –10°C…+60°C (+14…+140°F):
±(0.3% x TD + 0.3%)
– for –40°C…–10°C (–40…+14°F),
+60°C…+85°C (+140…185°F):
±(0.5% x TD + 0.5%)
Smart and PROFIBUS-PA electronics:
– for –10°C…+60°C (+14…+140°F):
±(0.2% x TD + 0.2%)
– for –40°C…–10°C (–40…+14°F),
+60°C…+85°C (+140…185°F):
±(0.4% x TD + 0.4%)
Temperature coefficient (maximum TK)
– If the temperature coefficient level exceeds the
thermal change, then the thermal change
automatically becomes valid.
– Applies to transmitters without diaphragm seals or
capillary tubes, see also "Temperature Effects"
page 12.
Zero signal and span:
Analogue electronics:
– for –10…+60°C (+14…+140°F): ±0.15% of nominal value/10 K
– for –40…–10°C (–40…+14°F),
+60…+85°C (+140…185°F):
±0.2% of nominal value/10 K
Smart and PROFIBUS-PA electronics:
– for –10…+60°C (+14…+140°F): ±0.08% of nominal value/10 K
– for –40…–10°C (–40…+14°F),
+60…+85°C(+140…185°F):
±0.1% of nominal value/10 K
Vibration effects
None (4 mm in path peak-to-peak 5…15 Hz,
2 g: 15…150 Hz, 1 g: 150 Hz…2000 Hz)
–1
0
0.4
+1
nominal value
set span***
measurement limits**
+5%
–5%*
extended measurement limits
Figure 1: extended measurement limits
* not with absolute pressure sensors or
with overpressure sensors with lower
measurement limit of –1 bar
** measurement limits, see page 15
Examples:
0…4 bar overpressure sensor:
extended measurement limits:
–0.2…4.2 bar
0…10 bar absolute pressure sensor:
extended measurement limits:
0…10.5 bar
abs
Figure 2: Turn down
Explanation of terms:
Turn down (TD) =
nominal value / set span***
Example:
nominal value = 1 bar
set span*** = 0.4 bar
TD = 1 : 0.4
***
Calibrated span for instruments
with PROFIBUS-PA electronics
16
Содержание cerabar M PMP 46
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