IE-SNC-Tx6xx-07
4
Introduction
This chapter provides basic information about device. Before starting please read
this manual carefully.
The Web Sensor devices are designed for measurement of temperature, relative humidity,
atmospheric pressure or carbon dioxide concentration of air without aggressive substances.
Measured quantities are according device type. Devices with relative humidity measurement
can show one of computed quantities: dew point temperature, absolute humidity, specific
humidity, mixing ratio and specific enthalpy.
Temperature units are °C or °F.
Pressure units
are hPa, PSI, inHg, mBar, oz/in
2
, mmHg, inH
2
O and kPa. Communication interface of Web
Sensors is Ethernet. Web Sensor can be powered from external power supply adapter or by
power over Ethernet
–
PoE. Device types:
Type
Temperature
Relative humidity Pressure
CO
2
concentration
Computed
quantity
T0610
✓
T4611
✓
T3610
✓
✓
✓
T3611
✓
✓
✓
T7610
✓
✓
✓
✓
T7611
✓
✓
✓
✓
T7613D
✓
✓
✓
✓
T6640
✓
✓
✓
✓
T6641
✓
✓
✓
✓
T5640
✓
T5641
✓
Models marked TxxxxZ are custom-specified devices. Description of these devices is not
included in this manual.
A multiple point CO
2
and temperature adjustment procedure leads to excellent CO
2
measurement accuracy over the entire temperature working range; this is a must for process
control and outdoor applications. The dual wavelength NDIR CO
2
sensing procedure
compensates automatically for ageing effects. The CO
2
module is highly resistant to pollution
and offers maintenance free operation and outstanding long term stability.
Measured values can be read in „SLOW mode“ (filtered, averaged) or in „FAST mode“
(current values without averaging). „SLOW mode“ has advantages in applications like
climate control because of filtering short time peaks. As an example exhaled air from
an employee passing the sensor could affect the climate control negatively with a short
response time because the control would trigger a change of the ventilation based on this
one-
time measurement. On the contrary in „FAST mode“ no software filter is used for
Chapter
1
