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MDP200 Datasheet_V1.3

April 2018

9/12

6

Altitude Correction

The MDP200 series utilizes a thermal principal to measure pressure difference to

achieve high sensitivity, robustness and stability. Changes in altitude from the

calibration condition (sea level) require output adjustment as shown below. Air

pressure above sea level can be calculated as:

6.

Effects on Hose Lengths

Since the MDP200 series utilizes a thermal measurement principal with air flowing

through the sensor, long tubing length has an impact to the sensor output due to

frictional losses. The amount of impact depends on the hose material, internal

diameter and total length leading to and away from the sensor. In general, tubing

length shorter than 1 meter has less 1% (m.v.) impact. Refer to the application notes

on tubing length effect of MDP200 series for details.

Altitude (meters)

Correction Factor

0

1.00

250

1.03

425

1.05

500

1.06

750

1.09

1000

1.13

1500

1.20

2000

1.27

3000

1.44

������ = 101325(1 − 2.25577 × 10−5ℎ)5.25588

where

P is air pressure (Pa)

h is altitude above sea level

Example:

Air pressure at Elevation 1000 meters.

The air pressure altitude 1000meters can

be calculated as

������ = 101325(1 − 2.25577 × 10−5 × 1000)5.25588

= 26436(Pa)