SDP1000-R datasheet(3/10 Pages) ETC2

3 / 10 page

www.sensirion.com

v5 February 2013

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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

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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