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SDP1000-L Datenblatt(PDF) 3 Page - List of Unclassifed Manufacturers

Teilenummer SDP1000-L
Bauteilbeschribung  For cost sensitive HVAC and medical OEM applications
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www.sensirion.com
v5 February 2013
3/10
Table 2: Additional sensor specifications.
Media
Air, N2 – for other gases contact Sensirion AG.
Operating Conditions:
- Temperature
- Humidity
-10 °C … +60 °C / 14°F … 140 °F
non-condensing
Ambient storage conditions1
-40 °C … +80 °C / -40°F … 176 °F
Orientation sensitivity
below resolution
Response time
40 ms (for faster response time contact Sensirion)
Admissible overpressure (short term)
1 bar (14.5 PSI)
Burst Pressure Capability
2 bar (29 PSI)
Weight
14 g
Protection Class
IP 20
Wetted materials
Glass (silicon nitride, silicon oxide), Silicon, PPS (Polyphenylene Sulfide),
PEEK (Polyetheretherketone), FR4, Silicone as static sealing, Epoxy, Gold
Gas flow through sensor
see Figure 6.
Lead free
The SDP1000 family is fully RoHS compliant
(1) For maximum 2 weeks
1.1 Temperature Compensation
The SDP1000 / SDP2000 differential pressure
sensors feature a sophisticated built-in temperature
compensation circuit. The temperature is measured
on the CMOSens chip by means of a PTAT bandgap
reference temperature sensor. Its data is fed into a
compensation circuit which is also integrated on the
CMOSens® sensor chip. No external temperature
compensation is therefore required.
1.2 Altitude Correction
The SDP1000 / SDP2000 differential pressure
sensors achieve their unsurpassed performance by
using a dynamic measurement principle, i.e. an
applied differential pressure forces a small air flow
through the sensor. This results in a dependence of
the indicated differential pressure on the ambient air
density. While the temperature effect is compensated
(see Paragraph 1.1) the altitude above sea level has
an influence on the SDP1000 / SDP2000 output. If
desired, this effect can be compensated by a
correction factor according to the following equation:
Dpeff = Dpsensor * Pcal / Pamb
where Dpeff is the effective differential pressure,
Dpsensor the differential pressure indicated by the
SDP1000 / SDP2000, Pcal the absolute pressure
during calibration (966 mbar) and Pamb the actual
ambient absolute pressure.
This leads to the following correction factors:
Table 3: Altitude correction factors.
Altitude
[meter]
Ambient
Pressure
(Pamb) [mbar]
Correction Factor
Pcal / Pamb
0
1013
0.95
250
984
0.98
425
966
1.00
500
958
1.01
750
925
1.04
1500
842
1.15
2250
766
1.26
3000
697
1.38
Example:
The SDP1000 is used at 750 m above sea level. The
output of the SDP1000 shows 0.5 V, which
corresponds to Dpsensor = 33.3 Pa. Taking into account
the correction factor Pcal / Pamb = 1.04 the effective
differential pressure Dpeff is 33.3 Pa * 1.04 = 34.6 Pa.
Note:
In many HVAC applications such as filter monitoring,
fan/ventilator control or air flow measurement the
described effect is actually welcome since at the end
the mass flow and not volume flow is the effective
value to control.


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