Pressure Sensor

Table of Contents

1 Overview
2 Specifications

Overview

A change in the gas and/or atmospheric pressure causes a change in the number of molecules per volume and thus a change in gas density. This density change in turn has a significant influence on the result of the concentration measurement by the sensor. By measuring the gas pressure inside of the sample cell (cuvette), the value of the concentration measurement is compensated / corrected.

The pressure sensor enables an increase in the accuracy of the gas analysis measurement by a factor of 15:

Without pressure sensor: ±1.5% per pressure difference of 10 hPa
With pressure sensor: ±0.1% per pressure difference of 10 hPa

The pressure sensor is always integrated into the RITTER »MultiGas« NDIR sensors as a micro-sensor. It is optionally available for the NDUV sensors and is built into the sensor casing. The measured pressure value is displayed in the provided software.

Specifications

For non-aggressive gases:

Pressure compensation of measured gas concentrations
Measuring range: 800 – 1,200 mbar abs.
Measurement accuracy: ±1% of span (full scale)
Resolution: <1 mbar
Response time (t₉₀): 1 s
Incl. temperature compensation

For H₂S and similar acid gases:

Pressure compensation of measured gas concentrations
Measuring range: 0.2 – 3.5 bar abs.
Measurement accuracy: ±1% of span (full scale)
Resolution: 2 mbar
Response time (t₉₀): 1 s
Incl. temperature compensation

V 1.0 / Rev. 2024-02-23 / Subject to alterations.

The most recent version of this data-sheet can be found at …
https://www.ritter.de/en/pressure-sensor/

Dr.-Ing. RITTER Apparatebau GmbH & Co. KG · Coloniastrasse 19-23 · D-44892 Bochum · Germany
For questions please contact mailbox@ritter.de or your local distribution partner (on our overview page)