E+E EE872 Operating Manual

User Manual

EE872

Modular Probe for CO2, RH, T and p

BA_EE872_e // V1.2 // technical data are subject to change

E+E Elektronik Ges.m.b.H. doesn‘t accept warranty and liability claims neither upon this publication nor in case of
improper treatment of the described products.

The document may contain technical inaccuracies and typographical errors. The content will be revised on a
regular basis. These changes will be implemented in later versions. The described products can be improved and
changed at any time without prior notice.

© Copyright E+E Elektronik Ges.m.b.H. All rights reserved.

EMC note USA (FCC):

This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to part 15
of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when
the equipment is operated in a commercial environment. This equipment generates, uses, and can radiate radio
frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful
interference to radio communications. Operation of this equipment in a residential area is likely to cause harmful
interference in which case the user will be required to correct the interference at his own expense.

EMC note Canada (ICES-003):

CAN ICES-3 (A) / NMB-3 (A)

CONTENTS

1 General ................................................................................................................................................. 4

1.1 Explanation of Symbols .................................................................................................................................4

1.1.1 General Safety Instructions .................................................................................................................................. 4

1.2 Environmental Aspects ..................................................................................................................................4

1.2.1 Mounting and Start-up .........................................................................................................................................5

2 Scope of Supply ..................................................................................................................................5

2.1 Accessories ...................................................................................................................................................5

2.2 Spare Parts ...................................................................................................................................................5

3 Product Description ............................................................................................................................ 6

3.1 Operation Principle ........................................................................................................................................6

3.2 Dimensions in mm (inch) ...............................................................................................................................6

3.3 Connectivity ...................................................................................................................................................7

3.4 Selection between Analogue Output and RS485 Interface ...........................................................................7

4 Installation ...........................................................................................................................................8

5 Setup and Adjustment ........................................................................................................................8

5.1 EE-PCS Product Configuration Software ......................................................................................................9

5.2 Digital Interface RS485 with Modbus RTU Protocol ......................................................................................9

5.2.1 Digital Settings ..................................................................................................................................................... 9

5.2.2 Modbus Register Map ........................................................................................................................................ 10

5.2.3 Reading Example ............................................................................................................................................... 10

5.3 Error Indication on the Analogue Output (NAMUR) .....................................................................................11

6 Maintenance ....................................................................................................................................... 11

6.1 Replacing the Sensing Module EE872S .....................................................................................................11

6.2 Changing the Filter Cap ..............................................................................................................................12

6.3 EE872 Adjustment or Calibration with Reference CO2 Gas ........................................................................12

6.4 Protection of EE872 During Site Cleaning Application ................................................................................12

7 Technical Data ..................................................................................................................................13

1 General

This user manual serves for ensuring proper handling and optimal functioning of the device. The user
manual shall be read before commissioning the equipment and it shall be provided to all staff involved
in transport, installation, operation, maintenance and repair.

The user manual may not be used for the purposes of competition without the written consent of E+E
Elektronik® and may not be forwarded to third parties. Copies may be made for internal purposes. All
information, technical data and diagrams included in these instructions are based on the information
available at the time of writing.

Intended use

The EE872 modular probe is intended for the measurement of CO2, relative humidity (RH), temperature
(T) and ambient pressure (p). Additionally, the device calculates the dew point temperature (Td). The
probe is designed for the use in harsh and demanding environments such as agriculture, life stock
barns, hatchers, incubators, green houses or outdoors. The use of the EE872 other than described in
this manual is not recommended.
The manufacturer cannot be held responsible for damages as a result of incorrect handling, installation
and maintenance of the device. Unauthorized modifications of the product lead to loss of all warranty
claims. The device may only be powered with safety extra-low voltage (SELV).

Disclaimer

The manufacturer or his authorized agent can be only be held liable in case of willful or gross
negligence. In any case, the scope of liability is limited to the corresponding amount of the order issued
to the manufacturer. The manufacturer assumes no liability for damages incurred due to failure to
comply with the applicable regulations, operating instructions or the specified operating conditions.
Consequential damages are excluded from the liability.

1.1 Explanation of Symbols

This symbol indicates safety information.

It is essential that all safety information is strictly observed. Failure to comply with this information can
lead to personal injuries or damage to property. E+E Elektronik® assumes no liability if this happens.

This symbol indicates instructions.

The instructions shall be observed in order to reach optimal performance of the device.

1.1.1 General Safety Instructions

• The device and mainly the filter cap shall not be exposed to unnecessary mechanical stress.

• Installation, electrical connection, maintenance and commissioning shall be performed by
qualified personnel only.

• Use the EE872 only as intended and observe all technical specs. The device must be operated with
the filter cap on at all times.

• This device is not appropriate for safety, emergency stop or other critical applications where device
malfunction or failure could cause injury to human beings.

1.2 Environmental Aspects

Products from E+E Elektronik® are developed and manufactured observing of all relevant requirements
with respect to environment protection. Please observe local regulations for the device disposal.

For disposal, the individual components of the device shall be separated according to local recycling
regulations. The electronics shall be disposed of correctly as electronics waste.

4

User Manual EE872 Modular Probe for CO2, RH, T and p

1.2.1 Mounting and Start-up

The device has been produced under state of the art manufacturing conditions, has been thoroughly
tested and has left the factory fulfilling all safety criteria. The manufacturer has taken all precautions to
ensure safe operation of the device. The user must ensure that the device is set up and installed in a
manner that does not have a negative effect on its safe use.
The user is responsible for observing all applicable safety guidelines, local and international, with
respect to safe installation and operation on the device. This user manual contains information and
warnings that must be observed by the user in order to ensure safe operation.

• Mounting, start-up, operation and maintenance of the device may be performed by qualified staff only.
Such staff must be authorized by the plant operator to carry out the mentioned activities.

• The qualified staff must have read and understood this user manual and must follow the instructions
contained within.

• All process and electrical connections shall be thoroughly checked by authorized staff before putting
the system into operation.

• Do not install or start-up a device supposed to be faulty. Make sure that such devices are not
accidentally used by marking them clearly as faulty.

• A faulty device may only be investigated and possibly repaired by qualified, trained and authorized
staff. If the fault cannot be fixed, the device shall be removed from the system.

• Service operations other than described in this user manual may only be performed
by the manufacturer.

2 Scope of Supply

• EE872 according ordering guide

• Test report according to DIN EN10204-2.2

• Quick User Guide

2.1 Accessories

• E+E Product Configuration Software
(Free download from www.epluse.com/Configurator) EE-PCS

• Modbus configuration adapter HA011018

• Connection cable M12 - flying leads

1.5 m (59.06”) / 5 m (196.85”) / 10 m (393.70”)

• T-coupler M12 - M12 HA030204

• M12 cable connector for self assembly HA010708

• Protection cap / calibration adapter HA010785

• Protection cap for the M12 cable socket HA010781

• Protection cap for the M12 plug of EE872 HA010782

• Mounting flange HA010226

• Wall mounting clip Ø 25 mm HA010227

• Radiation shield HA010510

• M12x1 flanged coupling with 50 mm (1.97”) stranded wire HA010705

2.2 Spare Parts

• PTFE filter cap HA010123

• Catalytic filter cap for H2O2 sterilization HA010124

• Replacement sensing module EE872S-...

Model

range

2

1)

CO

1) The CO2 range of the EE872S mu󰀬 be the same as of the original EE872 probe.

CO

(default: heated)

2

+ p (default: heated)

CO

2

+ T + RH + p (default: not heated)

CO

2

0...2 000 ppm

0...5 000 ppm

0...1 % (10 000 ppm)

0...3 % (30 000 ppm)

0...5 % (50 000 ppm)

HA010819/20/21

EE872S-

M10

M15

M13
HV1

HV2

HV3

HV5

HV6

User Manual EE872 Modular Probe for CO2, RH, T and p

5

3 Product Description

3.1 Operation Principle

The EE872 is available in three versions (see also Fig. 5)

EE872-M10...: The probe measures the CO2 concentration. The sensing module is heated by factory
default setting to prevent condensation. The CO2 measurement value is available on the
analogue output or on the digital interface.

EE872-M15...: The probe measures the CO2 and p. Per factory default, the sensing module is heated to
prevent condensation. The CO2 concentration and p values are available on the digital
interface.

EE872-M13...: The probe measures CO2, RH, T and p, and calculates Td. Since per factory default the
sensing module is not heated, the accurate measurement of RH and T is possible. In
case the user activates the probe heating is activated, the RH and T data is not available.
The calculated Td value is still available. All values are available on the digital interface.

All versions provide CO2 measurement T and p compensated.

The CO2 measurement is based on the dual wavelength/dual detector NDIR principle. Infrared light is
led through the gas to be examined. One detector is tuned to 4.2 µm, which is the wavelenght absorbed
by CO2. The second detector is tuned to 3.9 µm, a wavelenght that is not affected by any gas. The
CO2 concentration is calculated trom the different outputs of the two according detectors. For more
information, please see E+E‘s paper on the principles of CO2 measurement.

Please note: Changing the factory setup with respect to heating (on/off) may lead to an additional
measurement error of max. +/- 50 ppm CO2. This might lead to a CO2 measurement accuracy out of
specification.

3.2 Dimensions in mm (inch)

135 mm (5.3")

64 mm

(0.98")

Ø 25 mm

M12x1 male connector

Fig. 1 Dimensions of EE872

(2.1")

61 mm (2.4")

6

User Manual EE872 Modular Probe for CO2, RH, T and p

Fig. 2 Dimensions of optional radiation shield (accessory HA010510)

mA

2

4

V

Voltage output

Current output

3.3 Connectivity

34

5

1 2

front view

M12 male connector

Fig. 3 Pin and flying leads assignment

Pin number Function Wire colors for accessories:

- Couplig ange HA010705

- Connection cable HA010819/820/821

1 Supply voltage brown

2 B RS485 (D-) or voltage output white

3 GND blue

4 A RS485 (D+) or current output black

5 Conguration pin gray

3.4 Selection between Analogue Output and RS485 Interface

Conguration pin connected to GND:

• Independently of its original factory configuration, the EE872 features analogue outputs.

Conguration pin not connected:

• EE872 set to RS485 interface (option P1 in the order code): features RS485 interface.

• EE872 set to analogue outputs (option GA7 or GA11 in the order code): the RS485 interface is active

for the first 10 seconds after power on and awaits connection with the EE-PCS Product Configuration
Software. This allows for setup changes or adjustment of the EE872. If the connection to EE-PCS is
not established within 10 seconds, the device automatically changes to analogue output.

Change of the factory setup:

An EE872 set originally to analogue output can be changed to RS485 interface and vice versa using
the optional USB configuration cable and the free EE-PCS Product Configuration Software, see chapter
“Setup and Adjustment” below.
Please note: By changing the EE872 configuration, the product and the packaging label lose their vali­dity. Please see “Relabeling in case of product configuration changes” at http://downloads.epluse.com/

fileadmin/data/product/Configuration/Configuration_e.pdf.

User Manual EE872 Modular Probe for CO2, RH, T and p

7

4 Installation

Best measurement performance is achieved when the entire probe is located inside the environment to
be monitored. This is the case, for example, when the EE872 is fixed onto a wall with the mounting clip
HA010227 (not included in the scope of supply, see data sheet “Accessories”), or freely hangs from the
ceiling on the connection cable.

The probe can be installed also into a partition wall using the stainless steel mounting flange
HA010226 (not included in the scope of supply, see data sheet “Accessories”).
For large temperature difference between the two sides of the wall, T gradients may appear along the
probe. Although the CO2 measurement is T compensated, these gradients have a great impact on the
RH and T accuracy in the M13 model. Therefore, it is of paramount importance to minimize the tempe­rature gradients. The part of the probe standing out of the wall on the connection side shall be as small
as possible and well thermally insulated.

For best RH and T accuracy, model M13 shall be installed horizontally or with the filter cap positioned
downwards.

EE872 with mounting ange HA010226

For outdoor applications the EE872 must be used with the radiation shield HA010510 (not included in
the scope of supply, see data sheet “Accessories”), which protects the device against rain, snow, ice
and solar radiation.

5 Setup and Adjustment

The EE872 is ready to use and does not require any configuration by the user. The factory setup of
EE872 corresponds to the type number ordered. Please see chapter 3.1 for a model overview and the
data sheet at www.epluse.com/EE872. The user can change the factory setup by using the Modbus
configuration adapter (order code HA011018) and the EE-PCS Product Configuration Software.

One can change the CO
scaling and the digital settings. For p measurement, an offset correction is possible. The CO2, RH and T
measurement is offset and 2-point adjustable.

In addition, it is possible to enable or disable the pressure compensation (factory setting: enabled), the
sensing module heating (factory setting according to the model ordered) and the NAMUR error indication
(factory setting: disabled).

Please note: The EE872 may not be connected to any additional power supply when using the Modbus
configuration adapter HA011018.

output signal type (analogue to digital and vice versa), the analogue output

2

EE872 with mounting clip HA010227

PC

Fig. 4 Modbus configuration adapter HA011018

8

User Manual EE872 Modular Probe for CO2, RH, T and p

5.1 EE-PCS Product Configuration Software

1. Download the EE-PCS Product Configuration Software from www.epluse.com/configurator and

install it on the PC.

2. Connect the E+E device to the PC using the Modbus configuration cable.

3. Start the EE-PCS software.

4. Follow the instructions on the EE-PCS opening page for scanning the ports and identifying the

connected device.

5. Click on the desired setup or adjustment mode from the main EE-PCS menu on the left and follow

the online instructions of the EE-PCS

5.2 Digital Interface RS485 with Modbus RTU Protocol

5.2.1 Digital Settings

Factory settings User selectable values (via EE-PCS)

Baud rate 9600 9600, 19200, 38400
Data bits 8 8
Parity Even None, odd, even
Stop bits 1 1, 2
Slave address 237 1...247

Tab. 1 Data transmission

The recommended settings for multiple devices in a Modbus RTU network are 9600, 8, even, 1
The EE872 represents 1/10 unit load on an RS485 network.

Device address, baud rate, parity and stop bits can be set via:

1. EE-PCS, Product Configuration Software and the Modbus configuration adapter HA011018.

The EE-PCS can be downloaded free of charge from www.epluse.com/configurator.

2. Modbus protocol in the register 60001 (0x00) and 60002 (0x01). See Application Note Modbus

AN0103 (available on www.epluse.com/EE872)

The serial number as ASCII-code is located at read register address 30001-30008 (16 bit per address).
The firmware version is located at register address 30009 (bit 15...8 = major release; bit 7...0 = minor
release). The sensor name is located at register address 30010.

INTEGER 16 bit

Parameter Register number1) [DEC] Protocol address2) [HEX]

Read and write register: function code 0x03 / 0x06

Slave-ID Modbus address 0001 0x00
Modbus protocol settings

3)

0002 0x01

INFO (read register):

Parameter Register number1) [DEC] Protocol address2) [HEX]

Read and write register: function code 0x03 / 0x04

Serial number (as ASCII) 0001 0x00
Firmware version 0009 0x08
Sensor Name 0010 0x09

1) Register number starts from 1.

2) Protocol address starts from 0.

3) For Modbus protocol settings see Application Note Modbus AN0103 (available on www.epluse.com/EE872).

User Manual EE872 Modular Probe for CO2, RH, T and p

9

5.2.2 Modbus Register Map

The measured data is saved as 32 bit floating point values (data type FLOAT) and as 16 bit signed integer
values (data type INTEGER):

FLOAT 32 bit

Parameter Unit Register number1) [DEC] Protocol address2) [HEX]

Read register: function code 0x03 / 0x04

CO2 (average) ppm 1061 0x424
CO2 (raw) ppm 1063 0x426
Pressure p* mbar 1201 0x4B0
Pressure p* psi 1203 0x4B2
Relative humidity RH** % 1021 0x3FC
Temperature T** ° C 1003 0x3EA
Temperature T** ° F 1005 0x3EC
Temperature T** K 1009 0x3F0
Dew point temperature Td*** ° C 1105 0x450
Dew point temperature Td*** ° F 1107 0x452
Dew point temperature Td*** K 1147 0x47A

Tab. 2 Floating point values (read register)

INTEGER 16 bit

Parameter Unit Scale3)Register number1) [DEC] Protocol address2) [HEX]

Read register: function code 0x03 / 0x04

CO2 (average) ppm 1 4031 0xFBE
CO2 (raw) ppm 1 4032 0xFBF
Pressure p* mbar 10 4101 0x1004
Pressure p* psi 100 4102 0x1005
Relative humidity RH** % 100 4011 0xFAA
Temperature T** ° C 100 4002 0xFA1
Temperature T** ° F 50 4003 0xFA2
Temperature T** K 50 4005 0xFA4
Dew point temperature Td*** ° C 100 4053 0xFD4
Dew point temperature Td*** ° F 100 4054 0xFD5
Dew point temperature Td*** K 100 4074 0xFE9

Tab. 3 Integer values (read register)

*available for versions M13, M15
**available for version M13 only when probe is not heated (default setting)

***available for version M13 always: enabling or disabling the probe heating does not a󰀨ect the Td measurement

1) Register number starts from 1.

2) Protocol address starts from 0.

3) Examples: For scale 100, the reading of 2550 means a value of 25.5. For scale 50, the reading of 2550 means a value of 51.

5.2.3 Reading Example

Example of MODBUS RTU command for reading the CO
from the register 0x424:

Device EE872; slave ID 237 (0xED)
Reference document, chapter 6.3: http://www.modbus.org/docs/Modbus_Application_Protocol_V1_1b.pdf

Modbus ID

Request [Hex]: ED 03 04 24 00 02 93 9C

Modbus ID

Response [Hex]: ED 03 04 0B 00 44 A1 27 61

10

address

address

Function

code

Function

code

Starting

address Hi

Byte count

Starting

address Lo

Register 1

value Hi

(oat value) CO2 = 1288,34375 ppm

2

No. of

register Hi

Register 1

value Lo

User Manual EE872 Modular Probe for CO2, RH, T and p

No. of

register Lo

Register 2

value Hi

Register 2

value Lo

CRC

CRC

Decoding of oat values:

Float values are stored according IEEE754 standard. The byte pairs 1, 2 and 3, 4 are inverted as fol­lows:

MMMMMMMM MMMMMMMM SEEEEEEE EMMMMMMM

Byte 3 Byte 4 Byte 1 Byte 2

Example:

Response [Hex] Value in decimal

Byte 1 (Register 2 - Hi) Byte 2 (Register 2 – Lo) Byte 3 (Register 1 - Hi) Byte 4 (Register 1 - Lo)

44

See also Application Note AN0103 at www.epluse.com/EE872.

A1 0B 00 1288.34375

5.3 Error Indication on the Analogue Output (NAMUR)

The EE872 features an error indication on the analogue output according to the NAMUR NE 043
recommendations (Standardization of the Signal Level for the Failure Information of Digital Transmitters,
Edition 2003-02-03, see www.namur.net/en/recommendations-and-worksheets/current-nena.html).
The feature is disabled by factory default can be enabled with the EE-PCS Product Configuration
Software, see above.

Output signal NAMUR signal level

0-5 V 5.5 V

0-10 V 11 V

4-20 mA 21 mA

0-20 mA 21 mA

6 Maintenance

6.1 Replacing the Sensing Module EE872S

If needed, the sensing module can be replaced by a new one. Please refer to chapter 2.2 for the order
codes.

Please note:
The new sensing module EE872S must feature same CO2 measuring range as the original EE872 probe!
If the measuring range of the replacement module and of the original EE872 probe are different, the
analogue output will stay at 4 mA, 0 V or NAMUR error indication while the CO2 reading via RS485
interface will be 0 ppm.

Procedure:

» Power off the EE872.
» Remove the filter cap by
turning it counter-clockwise.
» Remove the sensing module by
pulling it straight out from the output unit.
» Plug the new EE872S sensing module
into the output unit.
» Screw the filter cap fingertight onto the probe.

output unit

sensing module

lter cap

Fig. 5 EE872 modular construction

User Manual EE872 Modular Probe for CO2, RH, T and p

11

6.2 Changing the Filter Cap

In a dusty, polluted environment it might be necessary to replace the filter cap once in a while. In most
of the cases, a clogged filter shows visible contamination or dirt. Longer response time of the CO2
measurement also indicates a clogged filter cap. In such cases, replace the filter by a new, original one,
see data sheet “Accessories”.

Procedure:

» Turn the filter cap counter-clockwise for removing it.
» Install the new filter cap fingertight by turning it clockwise.

6.3 EE872 Adjustment or Calibration with Reference CO2 Gas

Definitions:

Adjustment: the specimen is brought in line with the reference.
Calibration: the specimen is compared with a reference and its deviation from the reference is documented.

For EE872 calibration or adjustment with reference CO2 gas use the calibration adapter HA010785 (not
included in the scope of supply, see data sheet “Accessories”).

rubber

calibration adapter protection cap

Fig. 6 Calibration adapter HA010785 (with mounted rubber caps for use as protection cap)

Procedure:

» Remove the filter cap and install the calibration adapter onto the probe.
» Connect the calibration gas to one of the two connection nipples. The gas fed into the calibration

adapter shall freely flow out through the second nipple.

» Set the flow rate to 0.1 ... 1.0 l/min and consider a stabilization time of 10 min.

Please note:

• For best accuracy of the calibration procedure, the temperature difference between reference gas
and probe should be as low as possible.

• Adjustment/calibration shall be performed with the factory settings activated concerning sensing
module heating and pressure compensation.

caps

6.4 Protection of EE872 During Site Cleaning Application

The calibration adapter (HA010785) can also be used as a protection cap, for instance if the device
remains on the measuring site during cleaning operations. For this purpose, close both nipples with the
supplied rubber caps.
In case the probe is removed from the site, it is recommended to apply the protection cap for the M12
cable socket (HA010781) and the one for the EE872 M12 plug of (HA010782).

12

User Manual EE872 Modular Probe for CO2, 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)
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

3)

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

± 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)

1)

0...5 %:

90 s

63

(-4...113 °F) -0.3 % mv / °C, for CO

(-4...113 °F)

2)

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

20 ppm / year

2

< ± (1.5 % from full scale + 2 % mv)

> 10 000 ppm

2

(10.15...15.95 psi)

(0...140 °F)

mv = CO2 measured value

<10 000 ppm

2

Temperature

Working range -40…60 °C

(-40...140 °F)

Accuracy3) 5...60 °C (41...140 °F), typ. ± 0.5 °C (± 0.9 °F)

Outputs

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 (EE872 = 1/10 unit load)

2

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

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.

(-40...140 °F)

User Manual EE872 Modular Probe for CO2, RH, T and p

13

HEADQUARTERS

E+E Elektronik Ges.m.b.H.

Langwiesen 7
A-4209 Engerwitzdorf
Austria
Tel: [phone]
Fax: [phone]
[e-mail]
www.epluse.com

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