Monitor air quality

On-demand ventilation control in office buildings, schools, education and centers and sports facilities often involve measurement of CO₂. But a drawback of CO₂ measurement is that odors caused by VOC are not detected, since they have only a slight effect on the CO₂ measurements. Even though there is an actual ventilation need, this condition is not detected using traditional technology. With this VOC measuring instrument the room air quality can be determined based on human perception. More information on VOC can be found here

Properties

Sensor:

Temperature sensor:
- Measuring range: 0°C...85°C
Relative humidity sensor:
- Measuring range 5..95% RH, permissible ambient 0..95% (non-condensing)
Air quality sensor:
- Measuring range 450..2000ppm VOC as CO₂ equivalent

Connectivity:

Configurable LED tower on sensor for optical indication of limit values
Monitor temperatures and trends from a browser
Alarm and reporting function:
- E-mail for alarm or reporting functions
- SNMP polling / alarm traps
- Configure up to 12 alarm messages
Dynamic integration into other Web sites:
- Direct access to current measurement values via AJAX, JavaScript and Java applet
Additional software interfaces for incorporating into your systems/databases:
- OPC server
- Syslog
- Sensobase (database integration via ODBC)
- TCP and UDP sockets, client and server
- FTP (data logging)
Possible applications:
- Monitor temperatures in the server room, network cabinet or office
- Direct display of multiple measuring points in the browser via Java applet
- Logging of measurements via FTP, Excel file, email attachment and internal memory
- Dewpoint measurement, climate monitoring
- Green IT: Monitor efficiency of the server room climate control

Data logger:

Internal data logger
- Memory capacity: min. 7 weeks, max. 20 years
- Save frequency: 15, 30 sec, 1, 5, 15, 60 min
Document measurement data online in the W&T Cloud and access from anywhere in the world
Internal clock
- Time synchronization via time server calibration
- Battery-backed device clock

Standards & more

Supply voltage via Power-over-Ethernet (PoE)
- Phantom power using data pairs
- Power over unused wire pairs
- External power supply is an alternative
Conforms to standards both in office and industrial environments:
- High noise resistance for industrial environments
- Low noise emission for residential and business areas
5 year guarantee

Background information: Like all models im the Web-IO Climate series, the Web-Graph Air Quality model 57718 includes everything you need for connecting a temperature/relative humidity/ and air quality sensor to the computer network. In addition, the supply voltage per IEEE 802.3af (Power-over-Ethernet) can be provided over the network cable, with both phantom power over the data pairs as well as power using the wire pairs not used for 10/100BT. Problems with outlets, country-specific plug types, various AC voltages etc. are now a thing of the past. For cases in which PoE is planned but not yet fully implemented, it is also possible to provide power using an external power supply and screw terminals.

Teknical Data

Connections and displays:

Combined sensor:

Temperature, relative humidity, air quality measurement DB9 receptacle Cable length: 2m (can be extended to max. 20m)

Network:

10/100BaseT Autosensing/Auto-MDIX RJ45 IPv6 on request

Galvanic isolation:

Network connection min. 1500 V

Power supply:

Power-over-Ethernet (PoE) or DC 12V .. 48V (+/-10%) or AC 18Veff .. 30Veff (+/-10%)

Supply connection:

Plug-in screw terminal, 5.08mm spacing Labeled "L+" and "M"

Power consumption:

PoE Class 1 (0.44 - 3.84W) typ. 87mA @24VDC, 110mA @20VAC, max. 95mA @24VDC, 55mA @48VDC

Displays:

1 LED power 2 LEDs network status 4 LEDs status and error 3 LEDs traffic-light display in sensor

Measuring unit:

Measuring range:

0°C...85°C, 5..95% RH, 450-2000ppm VOC as CO₂ equivalent

Resolution:

1/10 °C, 1/10% rH

VOC sensor, detected substances:

Substance class	Occurrence/use (example)
Aldehydes	Disinfectants, paints, varnishes, tabacco smoke, perspiration, transpiration
Aliphatic hydrocarbons	Gasoline and diesel engine fuels, vehicle exhaust, LPG, solvents, cosmetics, flatulence, household materials, PVC
Alcohols	Coating agents, household materials, adhesives, solvents, carpets, disinfectants, cosmetics
Amines	Dyestuffs, agricultural and pharmaceutical chemicals
Aromatic hydrocarbons	Printers/copiers, computers, solvents, PVC, gasoline and diesel engine fuels, tobacco smoke
Ketones	Solvents, coating agents, adhesives, fingernail polish removers, paints, varnishes, carpets

Measuring error:

Temperature:

typ. @ 25°C ±0.3°C max. @ 0..50°C ±1.2°C

Relative humidity:

typ. @ 25°C ±3%rH max. @ 0..50°C ±7%rH (0-100%rH) Long-term stability typ. <0.5%rH / year

Aging of the VOC sensor:

Aging of the sensor is internally compensated for. It is however recommended that a CO₂ comparison measurement be performed once a year.

Measuring frequency:

Storage frequency:

15s, 30s, 1m, 5m, 15m, 60m

Memory depth (4MB):

min. 7 weeks, max. 20 years

Housing and other data:

Housing:

Plastic compact housing for top-hat rail mount 105x22x75mm (LxWxH)

Weight:

approx. 200g

Ambient temperature

Storage: -40..+70°C

Operating: Non-contiguous mounting: 0 .. +60°C contiguous mounting: 0 .. +50°C

Permissible relative humidity:

0..95% RH (non-condensing)

Scope of delivery:

1x Web-Thermometer Air Quality for DIN rail mounting 1x W&T prober, 2m (temperature/relative humidity & VOC) 1x product CD with WuTility management tool, OPC server, SNMP-MIB, reference manual German/English

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Web-Graph Air Quality