13
User Manual EE872 Modular Probe for CO
2
, RH, T and p
7 Technical Data
Measurands
CO
2
Measurement principle
Dual wavelength non dispersive infrared (NDIR)
Measurement range
0...2 000 ppm: < ± (50 ppm + 2 % mv)
mv = CO
2
measured value
Accuracy at 25 °C
(77 °F)
and
0...5 000 ppm: < ± (50 ppm + 3 % mv)
1013 mbar
(14,69 psi)
0...10 000 ppm: < ± (100 ppm + 5 % mv)
0...3 %:
< ± (1.5 % from full scale + 2 % mv)
0...5 %:
Response time t
63
1)
90 s
T dependency, typ.
± (1 + mv [ppm] / 1 000) ppm/°C, for CO
2
<10 000 ppm
(-20...45 °C)
(-4...113 °F)
-0.3 % mv / °C, for CO
2
> 10 000 ppm
Residual pressure dependency
2)
0.014 % mv / mbar (ref. to 1013 mbar)
(-20...45 °C)
(-4...113 °F)
Measurement interval
15 s (user adjustable from 15 s to 1 h)
Long
term stability, typ. at 0 ppm CO
2
20 ppm / year
Relative humidity
Working range
0...100 % RH, with enabled heating
0…95 % RH (non condensing), with disabled heating
Accuracy
3)
at 25 °C
(77 °F)
± 3 % RH (20...80% RH)
± 5 % RH (0...95% RH)
Pressure
Working range
700…1100 mbar
(10.15...15.95 psi)
Accuracy at 25 °C
(77 °F)
,
typ.
± 2 mbar
Temperature dependency
± 0.016mbar/K, 0...60 °C
(0...140 °F)
Temperature
Working range
-40…60 °C
(-40...140 °F)
Accuracy
3)
5...60 °C
(41...140 °F),
typ.
± 0.5 °C
(±
0.9 °F)
Outputs
Analogue (CO
2
only)
0 - 5 V / 0 - 10 V
-1 mA < Load current < 1 mA
0 - 20 mA / 4 - 20 mA (3-wire) Load resistance ≤ 500 Ohm
Digital interface (CO
2
, RH, T, p, Td)
RS485 (EE872 = 1/10 unit load)
Protocol
Modbus RTU
General
Supply voltage
15 - 35 V DC for current output
12 - 30 V DC for voltage output and RS485 interface
Average current consumption at 12 V DC
45 mA for 20 mA output current
and 15 s measurement inverval
25 mA for voltage output and RS485 interface
Peak current
max. 200 mA
Enclosure material
plastic (PET), UL94HB approved or
stainless steel 1.4404
Filter cap material
PTFE, UL94V-0 approved
Protection class
IP65
Electrical connection
M12 x 1, stainless steel 1.4404
Electromagnetic compatibility
EN61326-1
(Industrial enviroment)
EN61326-2-3
Storage conditions
-40...60 °C
(-40...140 °F)
700...1100 mbar
(10.15...15.95 psi)
0...95 % RH non condensing
1) With data averaging algorithm for smooth output signal. Faster response time available upon request.
2) The pressure dependency of a device without pressure compansation: 0.14 % mv / mbar.
3) At 24 V DC supply, air flow min. 0.3 m/s, probe horizontal or with sensing head downwards, excl. hysteresis.
