Air Quality (VOC) transmitter
For room mounting

QRT 24series

July 2018

Features• Used to determine the air quality,
based on a mixed gas sensor (VOC sensor)• To measure the air quality inoffices, hotels, meeting rooms, convention centres,schools, airports, apartments, stores, restaurants etc.
• 0-10 Vdc or 4-20 mA or 0-20 mA output (selectable)
0-10 Vdc: 0 Vdc = clean air, 10 Vdc = polluted air
4-20 mA: 4 mA = clean air, 20 mA = polluted air• Potential free changeover contact as a switch output• 3 types
QRT 24
QRT 24 L

standard typesame as QRT 24 and with“traffic light” 5 coloured LED´sindication of air quality (VOC)QRT 24 SS same as QRT 24 but withstainless steel enclosure

QRT 24QDT

Detectable gases• Cigarette smoke• Automobile exhaust• Breath air• Carbon dioxide (CO2 )• Carbon monoxide (CO)• Solvent fumes• Alcohol fumes• Acetone• Acrylonitrile• Ammonia• Benzene• Chlorine• Dimethyl amine• Ethane• Ethylene• Ethylene oxide• Formaldehyde• Hydrogen

QRT 24 SS• Hydrogen sulfide• Isobutane• Methane• Methanol• Methyl chloride• Methylene chloride• Methy ether• Methyl acetate• Methyl ethyl ketone• n-Hexane 2• n-Petane• Propane• R-11• R-12• R-502• R-123• Sulfur dioxide• Vinyl chloride

stainless steel enclosure

Ordering_____________________________________________________
Type no.
Description_____________________________________________________Air Quality transmitter (VOC) for Room Mounting

Ventilation Control Products Sweden AB•

QRT 24

Air Quality Transmitter for Room Mounting
0-10 Vdc or 4-20 mA output
with change over contact

QRT 24L

Same as QRT 24
and with “traffic light” 5 coloured LED´sindication of air quality (VOC)QRT 24 SS

Same as standard version QRT 24
but with stainless steel enclosure+46-31-811666•

info@vcp.se•

www.vcp.se

Air Quality (VOC) transmitter
For room mounting

Technical data

Measuringrange- For air quality measurement in offices, hotels, meeting rooms
and convention centres, apartments, stores, restaurants, etc.
- For quantitative evaluation of room air pollution withcontaminating gases (cigarette smoke, body perspiration,
exhaled breathing air, solvent vapours, emissions from building
members and cleaning agents)

0-100% air quality
referred to calibration gas
multi-range switching(selectable via DP-switches)- For adjustable sensitivity regarding the maximum air
contamination to be expected.

VOC sensibility: Low-Medium-High
Measuringaccuracy+/- 20% of final value(referred to calibration gas)

Power supply

24 Vac/dc (+/- 10%)Output0-10 Vdc or 4-20 mA (selectable)

Relay output(change overcontact)

July 2018

Applications
VOC sensor (metal oxide)with automatic self-calibration

SensorQRT 24series- For room ventilation as-needed, enabled by air changes only
taking place when air is polluted while conserving energy at
the same time..

Description
The self-calibrating microprocessor-controlled room air qualitytransmitter QRT 24-series used to determine the room air quality
on basis of a mixed gas sensor / VOC sensor(VOC = Volatile Organic Compounds).

potential-free changeover contact (24V)
switch point adjustable from 0-100%of output signal.

Room air quality is understood as subjective air quality,
felt by human beings with their olfactory organs.

Ambienttemp.range

0 to +50°C

Gas exchange

by diffusion

Service life

> 60 months (under normal load conditions)Warm-up period

1 hour

By linearising and high operating temperatures, the air qualitytransmitter achieves marginal drift and good stability.

Respone time

< 60 sec.

The sensor is automatically self-calibrating.

Enclosureplastic, material ABS,
colour pure white,similar to RAL 9010, QRT 24
stainless steel enclosure, QRT 24 SS

The air quality sensor does not trace the concentrations ofindividual gases, but assesses the mixed gas as such,i.e. gas concentrations are not measured selectively.

Dimensions

85 x 85 x 27 mm (QRT 24)
100 x 100 x 25 mm (QRT 24 SS)

Installationwall mounting or on in-wall flush box,
Ø 55 mm, base with 4-hole formounting on vertically or horizontally
installed in-wall flush boxes for cableentry from the back,with predetermined breaking point for
on-wall cable entry from top / bottom
in case of plain on-wall installation

Protection class

III (according to EN 60 730)

Protection type

IP 30 (according to EN 60 529)

Standards

CE conformity, electromagnetic
compatibility according to EN 61 326,
EMC Directive 2014 / 30 / EU,
Low Voltage Directive 2014 / 35 / EUAs perception varies from person to person and therefore,
air quality is assessed differently, a general definition ofcriteria for room air quality is not possible.

Therefore, it is not possible to specify gas concentrations by
the unit ppm.
Detectable gases: mixed gas, vapours of alcanoles, cigarettesmoke, automobile exhaust gases, exhaled breathing air,combustion smoke (from wood, paper, plastics).
In addition, compounds of alkanes, alkenes, aromats,terpenes, halogenated hydrocarbons, esters, aldehydes andketones as well as native VOCs such as terpenes andisoprene are ranking among volatile organic compounds VOC.
VOCs also evaporate from chemical products used inconstruction such as coating compounds, adhesives, orsealing compounds, furnishing objects, cleaning and careproducts, office chemicals and floor carpeting.
The sensor’s service life is depending on the type of burden
and gas concentration and is more than 60 months undernormal load conditions.
The new design implies the alternative to choose between
three sensibility ranges by means of DIP switches,comparable to three measuring ranges:
LOW for low, MEDIUM (default, equivalent to the hitherto
existing type of this device) for medium, and HIGH for highnoxious gas contaminations.

Ventilation Control Products Sweden AB•+46-31-811666•

info@vcp.se•

www.vcp.se

Air Quality (VOC) transmitter
For room mounting

QRT 24series

Dimensions in mm for ABS plastic housing QRT 24 and QRT 24 L

To open the enclosure, set a screwdriver(2.0) inthe groove at centre,press down, and lift up the bottom frame slightly.
Pull top cover forward and hold it.

Ventilation Control Products Sweden AB•+46-31-811666•

info@vcp.se•

www.vcp.se

July 2018

Air Quality (VOC) transmitter
For room mounting

QRT 24series

Dimensions in mm for stainless steel housing QRT 24 SS

Ventilation Control Products Sweden AB•+46-31-811666•

info@vcp.se•

www.vcp.se

July 2018

Air Quality (VOC) transmitter
For room mounting

QRT 24series

Electrical connections

Ventilation Control Products Sweden AB•+46-31-811666•

info@vcp.se•

www.vcp.se

July 2018

Air Quality (VOC) transmitter
For room mounting

QRT 24series

DIP switches

Traffic light indication

Ventilation Control Products Sweden AB•+46-31-811666•

info@vcp.se•

www.vcp.se

July 2018