Data Sheet for Product

ManualsBrandsSiemens ManualsSensors Air qualityIndoor Air Quality Sensors QPA10.., QPA20..

QPA20xx Series

Technical Instructions

Document No. CE1N1961

July 26, 2019

Indoor Air Quality Room

Sensors

Siemens Industry, Inc.

Description

The QPA20xx Series Room Air Quality Sensors are designed for applications where

precise, stable carbon dioxide or air quality sensing is required.

Several models are available ⎯ with either CO

only, or with Volatile Organic

Compounds (VOC) (also known as mixed gas), relative humidity and/or temperature

sensing. All units deliver a voltage or current (selectable) signal and have a CO

measuring range of 0 to 2000 ppm.

Features

• Maintenance-free, Non-Dispersive Infrared (NDIR) CO

sensing element is ideal for

use in spaces that are occupied 24/7.

• Combination units enable a single sensor to take the place of up to three individual

sensors.

• No recalibration required.

• 24 Vac or 15 to 35 Vdc operating voltage

• 0 to 10 Vdc, 0 to 5 Vdc, or 4 to 20 mA signal outputs (field selectable)

Application

For use in ventilation and air conditioning applications to enhance room comfort and to

optimize energy consumption by providing demand-controlled ventilation. The sensor

acquires:

• CO

concentrations as an indication of occupancy in rooms where smoking is

prohibited.

• The relative humidity in the room.

• The room temperature.

QPA2002 models measure both CO

and volatile organic compounds (VOC) for

optimized indoor air quality. A single 0 to 10V, 0 to 5V, or 4 to 20 mA (selectable)

output signal is automatically adjusted to reflect the higher of the two values. This

enables the combination CO

+ VOC sensor to be easily substituted for a CO

sensor in

any demand control ventilation control system.

Summary of content (9 pages)

PAGE 1
Technical Instructions Document No. CE1N1961 July 26, 2019 QPA20xx Series Indoor Air Quality Room Sensors Description The QPA20xx Series Room Air Quality Sensors are designed for applications where precise, stable carbon dioxide or air quality sensing is required. Several models are available ⎯ with either CO2 only, or with Volatile Organic Compounds (VOC) (also known as mixed gas), relative humidity and/or temperature sensing.
PAGE 2
Technical Instructions Document Number CE1N1961 July 26, 2019 Application, Continued QPA20xx Series Indoor Air Quality Room Sensors The QPA20xx Series Room Sensors can be used as: • Control sensors. • Transmitters for building automation and control systems and/or display units. Typical use: • Acquisition of CO2 and VOC concentrations: In party rooms, lounges, fair pavilions and exhibition halls, restaurants, canteens, shopping malls, sports gymnasiums, sales rooms, and conference rooms.
PAGE 3
QPA20xx Series Indoor Air Quality Room Sensors CO2/VOC Concentration (QPA2002 and QPA2002D Only) Technical Instructions Document Number CE1N1961 July 26, 2019 The sensor acquires and evaluates the CO2 /VOC concentration and converts it to a ventilation demand signal. It represents the result of maximum selection of the CO 2 measuring signal and the filtered VOC measuring signal.
PAGE 4
Technical Instructions Document Number CE1N1961 July 26, 2019 Mechanical Design QPA20xx Series Indoor Air Quality Room Sensors These are wall-mounted units, and they are designed for use with most types of commercially available, recessed conduit boxes. The cables can be introduced from the rear (concealed wiring) or from below or above (surface-run wires) through knockout openings. The units consist of two major sections: Casing and baseplate. Both snap together but can be detached again.
PAGE 5
QPA20xx Series Indoor Air Quality Room Sensors Output Signal Selection Technical Instructions Document Number CE1N1961 July 26, 2019 • O1 = 4 to 20 mA • O2 = 0 to 10V • O3 = 0 to 5V Active Test Function Jumper for the measuring range in the vertical position: The signal output delivers the values according to the Test function active table (see Figure 3).
PAGE 6
Technical Instructions Document Number CE1N1961 July 26, 2019 Cable Routing and Selection QPA20xx Series Indoor Air Quality Room Sensors • When laying the cables, it should be considered that electrical interference increases the longer the cables run parallel and the smaller the distance between them. • On applications with EMC problems, shielded cables should be used. • For the secondary power lines and signal lines, use cables with twisted pairs.
PAGE 7
QPA20xx Series Indoor Air Quality Room Sensors Functional data, rh with Range of use QPA2062 and QPA2062D Measuring range Measuring accuracy @ 73°F (23°C) and 24 Vac 0 to 95% rh 30 to 70% rh Temperature dependency Time constant Output signal, linear (terminal X2) Functional data, temperature with QPA206xx Measuring range Measuring element Measuring accuracy at 24 Vac: 59°F to 95°F (15°C to 35°C) outside the above range, between: -31°F to 122°F (-35°C to 50°C) Technical Instructions Document Number CE1N19
PAGE 8
Technical Instructions Document Number CE1N1961 July 26, 2019 Additional Notes QPA20xx Series Indoor Air Quality Room Sensors Room sensors with active outputs have power dissipation influencing temperature measurement. The degree of influence depends on the operating voltage and is compensated at 24 Vac operating voltage in Siemens QPA20 Series room sensors. All other operating voltages may result in over- or under-compensation.
PAGE 9
QPA20xx Series Indoor Air Quality Room Sensors Technical Instructions Document Number CE1N1961 July 26, 2019 Dimensions Figure 8. Dimensions in Inches (Millimeters). Information in this publication is based on current specifications. The company reserves the right to make changes in specifications and models as design improvements are introduced. Products or company names mentioned herein may be the trademarks of their respective owners © 2019 Siemens Industry, Inc. Siemens Industry, Inc.