EE850 Duct Mount Sensor User Manual: CO2, Humidity, and Temperature Measurement

General Information

1.1 Explanation of Symbols

[Warning] This symbol indicates safety instructions. The safety instructions must be carried out unconditionally. If disregarded, loss, injury, or damage may be inflicted to people or property. In any case E+E Elektronik® Ges.m.b.H. cannot be held responsible.

[Info] This symbol indicates attention. The note should be observed to achieve an optimum and safe operation of the equipment.

1.2 Safety Instructions

1.2.1 General Safety Instructions

• Avoid any unnecessary mechanical stress and inappropriate use.
• The device shall not be exposed to extreme thermal stress.
• Installation, electrical connection, maintenance, and commissioning shall be performed by qualified personnel only.

Please note: The EE850 is not appropriate for safety, emergency stop, or other critical applications where device malfunction or failure could cause injury to humans and other living beings.

1.2.2 Intended Use

The EE850 is intended for CO2, humidity (RH), and temperature (T) measurement in ducts. Its typical application is in demand-controlled ventilation and building automation. Due to its wide measuring ranges and its insensitiveness to pollution, the EE850 can be employed in demanding climate and process control as well.

The sensor is available with two different probe lengths and analogue and digital outputs. The analogue outputs can be current or voltage outputs and provide the measured values as well as the calculated value for the dew point temperature (Td). The RS485 interface with Modbus RTU or BACnet MS/TP protocol also supplies other calculated parameters such as absolute humidity (dv), mixing ratio (r), water vapour partial pressure (e), or enthalpy (h).

The use of the EE850 in any other way than described in this manual bears a safety risk for people and the entire measurement installation and is therefore not allowed. The manufacturer cannot be held responsible for damages as a result of incorrect handling, installation, and maintenance of the equipment.

1.2.3 Installation, Start-up and Operation

The EE850 duct sensor has been designed and produced under state-of-the-art manufacturing conditions, has been thoroughly tested, and has left the factory after fulfilling all safety criteria. The manufacturer has taken all actions to assure safe operation. The user has to make sure that the equipment is positioned and installed in such a way that safe operation is not impaired. The user is responsible for observing all applicable safety guidelines, local and international, with respect to safe installation and operation on the device.

This manual contains information and notes of caution, which have to be followed by the user to assure safe operation.

• Mounting, electrical installation, putting into operation, and maintenance may be performed by qualified personnel only. Such staff must be authorized by the operator of the facility to carry out the mentioned activities.
• The qualified staff must have read and understood this manual and must follow the instructions contained within.
• All process and electrical connections shall be thoroughly checked by authorized staff before putting the device into operation.
• Do not put damaged products into operation and protect them from accidental commissioning. Mark the damaged product as defective.
• 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 process.
• Service operations other than described in this user manual may only be performed by the manufacturer.

In order to avoid damage to the instrument or health hazards, the measuring equipment must never be manipulated with tools that are not specifically described in this manual.

The sensor may only be utilized in accordance with the conditions defined in the technical data. Otherwise, measurement inaccuracies will occur and equipment failures cannot be ruled out.

The steps recommended by the manufacturer for installation, inspections, and maintenance work must be observed and carried out for the safety of the user and for the functionality of the equipment.

Unauthorized product modification leads to loss of all warranty claims. This may be accomplished only with an explicit permission of E+E Elektronik®!

1.3 Environmental Aspects

Products from E+E Elektronik® are developed and designed considering the importance of environmental protection. Therefore, disposal of the product should also not lead to pollution of the environment.

Single-variety components must be separated before the transmitter is disposed of. The electronic components must be collected and properly disposed of as electronic scrap.

Scope of Supply

• EE850 sensor according to ordering guide
• Cable gland
• Mounting flange + seal
• Mounting material
• Two self-adhesive labels for configuration changes (see user guide at www.epluse.com/relabeling)
• Test report according to DIN EN10204-2.2
• Quick guide

Product Description

3.1 General

Installed into a duct, a small amount of air flows through the divided probe into the EE850 enclosure, where the CO2 sensing cell is located, and back into the duct. The RH and T sensing elements are placed inside the probe.

Diagram Description: The diagram illustrates the sensor probe inserted into a duct. Air flows into the probe, past the CO2 sensing cell within the enclosure, and exits back into the duct. The RH and T sensors are located within the probe itself. Arrows on the EE850 cover indicate the correct airflow direction for optimal response time.

Very important: For accurate measurement, the cover of the EE850, as well as the cable outlet (cable gland or conduit adapter), must be closed tightly. This is essential for avoiding ingress of air other than from the duct into the EE850 enclosure, which would falsify the measurement.

Please note: The direction of air flow in the duct shall correspond to the direction indicated with arrows on the EE850 cover. Depending on the EE850 version, the response time specified is only valid for the direction marked with the blue arrow with respect to the cable gland position. Air flow in the opposite direction might lead to longer response time.

3.2 Installation

Diagram Description: The diagram shows the physical dimensions for mounting the EE850 sensor. Key dimensions include a circular opening of Ø > 16 mm (0.63 in) and a mounting hole pattern with dimensions 60 ±0.3 mm (2.36 ±0.11 in) and 90 ±0.3 mm (3.54 ±0.11 in). Recommended mounting screws are ST4.2x50 DIN 7981 C. The diagram also indicates the placement of the rubber gasket, cable gland (M16x1.5), and conduit knockout.

For EE850 with conduit connection for the North American market: use a flat screwdriver to carefully break open the plastic knockout at the marked location, in order to avoid damaging the electronics inside the enclosure. The conduit adapter is not included in the scope of supply.

3.3 Electrical Connection

Diagram Description: The diagrams illustrate the terminal connections for various EE850 models:

• EE850-M10 / voltage output: Terminals for Power Supply (24 V AC ±20% / 15-35 V DC), GND, and CO2 output.
• EE850-M10 / current output: Terminals for Power Supply (24 V AC ±20% / 15-35 V DC), GND, and CO2 output (4-20 mA).
• EE850-M11 / voltage output: Terminals for Power Supply (24 V AC ±20% / 15-35 V DC), GND, CO2 output, T output, and RH output.
• EE850-M12 / voltage output: Terminals for Power Supply (24 V AC ±20% / 15-35 V DC), GND, CO2 output, T active, T passive, T passive.
• EE850-M1xJ3 / digital output: Terminals for Power Supply (24 V AC ±20% / 15-35 V DC), GND, RS485 (A and B).

Very important: For failure-free operation and performance according to the specs, the supply GND and the measurement GND must be wired separately.

3.4 Setup and Adjustment

The EE850 is ready to use and does not require any configuration by the user. The factory setup of EE850 corresponds to the type number ordered. For the ordering guide, please see the data sheet at www.epluse.com/ee850.

If needed, the user can change the factory setup by using the optional USB Configuration Adapter (HA011066) and the Product Configuration Software (EE-PCS). One can change the CO2 output signal, the scaling of the outputs, and perform CO2, RH, and T adjustment/calibration.

Please note: The EE850 may not be connected to any additional power supply when using the USB Configuration Adapter (HA011066).

Diagram Description: A diagram shows a PC connected to the HA011066 USB Configuration Adapter, which is then connected to the EE850 sensor, illustrating the configuration setup.

MODEL EE850-M10: Select the CO2 output signal

The output signal can be changed from voltage to current or vice-versa. Set the output signal selection switch to 'I' for current 4 - 20 mA output or to 'U' for voltage 0 - 10 V output. The original CO2 output range does not change, and the calibration data remains valid.

Example:

• Factory setup: voltage output (U), output scale: 0 - 10 V = 0...10000 ppm
• User setup (after setting the output signal selection switch to I): current output (I), output scale: 4 - 20 mA = 0...10000 ppm.

MODELS EE850-M11 and EE850-M12: Changing the CO2 and T output scale

The scaling of the output can be changed by using the USB Configuration Adapter (HA011066) and the Product Configuration Software (EE-PCS).

Example:

Please note:

• After changing the factory setup (output signal and/or output scale), the original type number on the EE850 identification label loses its validity; it does not match any longer the device setup.
• The return to factory setup function of EE-PCS restores the original adjustment/calibration of the device, but does not affect the user setup for output signal and output scale.

The Product Configuration Software (EE-PCS) is available for free download at www.epluse.com/configurator.

3.5 Digital Settings

3.5.1 Bus Termination Resistor

Hardware: The bus termination shall be realized with the 120 Ω resistor (slide switch on the board).

Diagram Description: The diagram shows a circuit board with a slide switch labeled "120 Ohm Termination" and "ON-OFF". This switch is used to enable or disable the bus termination resistor.

Very important: For proper function, the power supply must be strong enough to ensure supply voltage within the specified range (see technical data) at any time and at all devices in the bus. This is particularly relevant when using long and thin cables which can cause high voltage drop. Please note that a single EE850 requires peak current of 350 mA.

3.5.2 Modbus Address Setting

Address setting via EE-PCS Product Configuration Software:

All DIP switches at position 0 → address has to be set via PCS.

• Modbus (Slave device): Factory setting EE850: 67 (permitted values: 1...247).
• BACnet (Master device): Factory setting EE850: 67 (permitted values: 0...127).

Example: Modbus address is set via configuration software.

Address setting via DIP switch:

Modbus (Slave device): Setting the DIP switches to any other address than 0 overrules the Modbus address set via configuration software (permitted values: 1...247).

BACnet (Master device): Setting the DIP switches to any other address than 0 overrules the Modbus address set via configuration software. BACnet Note: permitted values are 0...127.

The 8th bit of the DIP switches is ignored (Modbus address 127 = 0111 111). To set address 0 via DIP switches, the 8th bit shall be set to 1 (Modbus address 0 = 1000 0000).

Example: Modbus address set to 11 (= 0000 1011 binary).

3.5.3 BACnet Setup

Please see PICS (Product Implementation Conformance Statement) - available at www.epluse.com/ee850.

3.5.4 Modbus Setup

Table 1: Digital interface default settings

The recommended settings for multiple devices in a Modbus RTU network are 9600, 8, even, 1. The EE850 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 HA011066. 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 Modbus Application Note AN0103 (available on www.epluse.com/ee850).

The serial number as ASCII code is located in the register addresses 0x00...0x07 (16 bits per address). The firmware version is located in the register address 0x08 (bits 15...8 = major release; bits 7...0 = minor release). The beforementioned registers can be read out with function code 0x03 or 0x04.

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 Data:

¹) Register number starts from 1
²) Register address starts from 0

INTEGER 16 bit Data:

¹) Register number starts from 1
²) Register 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.

Communication settings (INTEGER 16 bit):

¹) Register number starts from 1.
²) Protocol address starts from 0.
³) If the Modbus address is set via DIP switch, the response will be NAK.
⁴⁾ For Modbus protocol settings see Application Note Modbus AN0103 (available at www.epluse.com).

INFO (read register):

¹) Register number starts from 1.
²) Protocol address starts from 0.

3.5.5 Modbus RTU Example

Example of MODBUS RTU command for reading the CO2 (float value) CO₂ = 1288.34375 ppm from the register 0x424.

Device EE850; Modbus address 67 [0x43]

Reference document, chapter 6.3: http://www.modbus.org/docs/Modbus_Application_Protocol_V1_1b3.pdf

Request [Hex]:

Response [Hex]:

Decoding of floating point values: Floating point values are stored according IEEE 754 standard. The byte pairs 1, 2 and 3, 4 are inverted as follows:

Example:

Technical Data

Measurands

CO2

Temperature

Relative Humidity

Outputs

Analogue

Digital Interface

General

¹) Under normal operating conditions
²) USA & Canada class 2 supply required, max. supply voltage 30 V DC

Company Information

HEADQUARTERS
E+E Elektronik Ges.m.b.H.
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Austria
Tel.: +43 7235 605-0
E-mail: info@epluse.com
Web: www.epluse.com

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