E+E EE872 Specifications

EE872

Modular Probe for CO2, Humidity,

Temperature and Ambient Pressure

The EE872 probe, with a measurement range up to 5 % CO2 (50 000 ppm), is suitable for use in harsh and demanding environment in agriculture, life stock barns, hatchers, incubators, green houses or outdoors.

Outstanding Accuracy

A multi-point CO2 and temperature (T) adjustment procedure leads to excellent

measurement accuracy over the entire T working range of -40…60 °C

(-40…140 °F), which is ideal for agriculture or outdoor use.

Long Term Stability

EE872 incorporates the E+E dual wavelength NDIR CO

cally compensates for ageing e󰀨ects and is highly insensitive to pollution. The RH

sensing element with E+E proprietary coating is suitable even for aggressive and corrosive environment.

Pressure and Temperature Compensation

The active compensation with on-board sensors leads to best CO accuracy independently of temperature, altitude or weather conditions.

4 in 1

Beside CO

, the EE872 measures also relative humidity (RH), temperature and ambient pressure (p). Additionally, the

devices calculated also the dew point temperature (Td).

Reliable in Harsh and Condensing Environment

The heated version of EE872 is suitable for high humidity and condensing environment. The IP65 enclosure and the

replaceable lter o󰀨er excellent protection in polluted environment. With a special lter cap, the EE872 is also appropriate for applications with periodical H

sterilization.

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Analogue Output or RS485 Interface

The CO

measured data is available simultaneously on the analogue voltage and current outputs. Depending on the

EE872 version, the RS485 interface with Modbus RTU protocol o󰀨ers also the RH, T, p, or Td data.

User Congurable and Adjustable

The free EE-PCS Product Conguration Software together with an optional adapter cable facilitates the conguration and

adjustment of the EE872.

sensor, which automati-

measurement

Features

Interchangeable Sensing Module

» E+E dual wavelength NDIR, auto-calibration » T and p compensation with on-board sensors » Heated versions for preventing condensation » RH sensing element protected by E+E coating » T range -40…60 °C (-40…140 °F) » User congurable and adjustable

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Supply and Output Unit

» CO2 voltage and current output » Modbus RTU (CO2, T, RH, p, Td) » IP65 protection class » Stainless steel or plastic enclosure » M12 stainless steel connector » User congurable

Filter Cap

» PTFE » Catalytic for H » Replaceable

Test Report

» According DIN EN 10204 - 2.2

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sterilisation

2O2

EE872

Technical Data

Measurands

CO2

Measurement principle Dual wavelength non dispersive infrared (NDIR) Measurement range 0...2 000 ppm: < ± (50 ppm + 2 % mv) Accuracy at 25 °C 1013 mbar

0...3 %:

Response time t T dependency, typ. ± (1 + mv [ppm] / 1 000) ppm/°C, for CO (-20...45 °C) Residual pressure dependency (-20...45 °C) Measurement interval 15 s (user adjustable from 15 s to 1 h) Long

term stability, typ. at 0 ppm CO

Relative humidity

Working range 0...100 % RH, with enabled heating 0…95 % RH (non condensing), with disabled heating

Accuracy

± 5 % RH (0...95% RH)

Pressure

Working range 700…1100 mbar

Accuracy at 25 °C (77 °F), typ. ± 2 mbar Temperature dependency ± 0.016mbar/K, 0...60 °C

(77 °F) and 0...5 000 ppm: < ± (50 ppm + 3 % mv)

(14,69 psi) 0...10 000 ppm: < ± (100 ppm + 5 % mv)

0...5 %:

90 s

(-4...113 °F) -0.3 % mv / °C, for CO

(-4...113 °F)

at 25 °C (77 °F) ± 3 % RH (20...80% RH)

0.014 % mv / mbar (ref. to 1013 mbar)

20 ppm / year

< ± (1.5 % from full scale + 2 % mv)

> 10 000 ppm

(10.15...15.95 psi)

(0...140 °F)

mv = CO2 measured value

<10 000 ppm

Outputs

General

EE872

Temperature

Working range -40…60 °C

(-40...140 °F)

Accuracy 3) 5...60 °C (41...140 °F), typ. ± 0.5 °C (± 0.9 °F)

Analogue (CO2 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

, RH, T, p, Td) RS485, max. 32 unit load devices on one bus (EE872 = 1/10 unit load)

Protocol Modbus RTU

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

700...1100 mbar (10.15...15.95 psi)

(-40...140 °F)

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.

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