Datasheet

148
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EE850
The EE850 is designed for use in building management applications.
A multiple point CO
2
and temperature factory adjustment procedure
leads to excellent CO
2
measurement accuracy over the entire tempera-
ture working range.
The EE850 incorporates the E+E dual wavelength NDIR CO
2
sensor,
which compensates for ageing effects, is highly insensitive to pollution
and offers outstanding long term stability.
Installed into a duct, a small amount of air will flow through the divided
probe into the transmitter housing, where the CO
2
sensing cell is loca-
ted, and back into the duct. The temperature sensor is located inside
the probe.
The CO
2
concentration up to 10,000ppm and the temperature are available on the voltage or current analogue outputs.
The EE850 offers an additional option for a passive temperature sensor output with 2-wires connection. An optional kit
facilitates easy configuration and adjustment of EE850.
EE850
CO
2
and Temperature Transmitter for Duct Mounting
Measuring Values
CO
2
Measurement principle dual wavelength non-dispersive infrared technology (NDIR)
Measuring range 0...2000 / 5000 / 10000ppm
Accuracy at 25°C
(77°F) 0...2000ppm: < ± (50ppm +2% of measured value)
and 1013mbar (14.7psi) 0...5000ppm: < ± (50ppm +3% of measured value)
0...10000ppm: < ± (100ppm +5% of measured value)
Response time
τ
63
< 100s at 3m/s (590ft/min) air speed in the duct
Temperature dependency typ. 1ppm CO
2
/°C (-20...45°C) (-4...113°F)
Calibration interval
1)
>5 years
Sample rate approx. 15s
Temperature
Working range 0...50°C (32...122°F)
Accuracy at 20°C (68°F) ±0.3°C (±0.54°F)
Response time
τ
63
< 50s
Outputs
Analogue Output
CO
2
: 0...2000 / 5000 / 10000ppm 0 - 5 / 0 - 10V -1mA < I
L
< 1mA
T: according ordering guide 4 - 20mA R
L
< 500 Ohm
Passive T-Output 2-wire connection, sensor type according ordering guide
General
Supply voltage 24V AC ±20% 15 - 35V DC
Current consumption typ. 15mA + output current
max. 0.5A for 0.3s
Warm up time
2)
< 5 min (for CO
2
only)
Min. flow speed 1m/s (196ft/min) recommended
Housing material Polycarbonate, UL94V-0 approved
Protection class Enclosure: IP65, probe: IP20
Cable gland M16 x 1.5
Electrical connection screw terminals max. 2.5 mm
2
(AWG 14)
Electromagnetic compatibility EN61326-1 EN61326-2-3 Industrial Environment
FCC Part 15 ICES-003 ClassB
Working conditions -20...60°C
(-4...140°F) 0...95% RH (non-condensing)
Storage conditions -20...60°C (-4...140°F) 0...95% RH (non-condensing)
1) under normal operating conditions 2) for performance according to specification
CO
2
Autocalibration
Outstanding long-term stability
Temperature compensation
Easy installation
Technical Data
EE850
Building management
Demand controlled ventilation
Process control
Typical Applications Key Features
EE850
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