SARAD Smart Radon Sensor Manuale utente

Manual

Smart Radon Sensor

Radon monitor for building automation

Version January 2020

Referenced documents

Software-Manual Radon Vision

SARAD GmbH

Wiesbadener Straße 10

01159 Dresden

Deutschland

www.sarad.de

[email protected]

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Table of content

TABLE OF CONTENT ...................................................................................................................... 2

INTRODUCTION............................................................................................................................ 3

THE INSTRUMENT......................................................................................................................... 4

Controls................................................................................................................................................ 4

Power supply ....................................................................................................................................... 6

Main power supply........................................................................................................................... 6

Back-up batteries ............................................................................................................................. 6

Batteries replacement ......................................................................................................................... 8

SELECTION OF THE RIGHT LOCATION FOR EXPOSURE AND INSTALLATION...................................... 9

SELECTION OF THE RIGHT INTEGRATION INTERVAL ....................................................................... 9

MEASUREMENT ......................................................................................................................... 10

LED INDICATORS......................................................................................................................... 11

COMMUNICATION INTERFACES .................................................................................................. 13

RS-485................................................................................................................................................ 13

General........................................................................................................................................... 13

Selection of the transfer protocol, addressing .............................................................................. 13

Implemented functions.................................................................................................................. 14

USB..................................................................................................................................................... 15

ANALOGUE OUTPUT................................................................................................................... 16

4..20mA current loop......................................................................................................................... 16

ALERT SWITCH............................................................................................................................ 17

SUPPLEMENTARY EQUIPMENT ................................................................................................... 18

Pressure sensor.................................................................................................................................. 18

CO2gas sensor ................................................................................................................................... 18

DISPOSAL INSTRUCTIONS ........................................................................................................... 19

TECHNICAL DATA........................................................................................................................ 20

Smart Radon Sensor .......................................................................................................................... 20

Wireless switch .................................................................................................................................. 22

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Introduction

The Smart Radon Sensor is an innovative Radon monitor, designed for integration in building

automatization systems. Thanks to the broad spectrum of interfaces one can integrate the sensor

with relative small effort within an existing infrastructure. The high sensitivity allows for quick and

precise determination of Radon value, so the device is suitable for controlling the ventilation

systems.

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The instrument

Controls

Fig. 1. - Front panel controls

Fig. 2. - Bottom panel controls

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RS-485 port „D-“

RS-485 port „D+“

4..20mA current loop „-“(GND)

4..20mA current loop „+“ (Iout)

DC external power supply „-“(GND)

DC external power supply „+“ (12÷24V)

Switch output port 1

Switch output port 2

Tab. 1. - Ports definition of terminal block.

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Power supply

Main power supply

The smart Radon Sensor requires an external power supply in range from 12V up to 24V. The

maximal current consumption does not exceed 50mA (including 20mA of current loop’s maximal

signal and active LEDs, but without usage of the CO2 sensor).

The connection ports for a power supply are shown in figure 1 and defined in table 2. Two ports of

the terminal block with the description „DC-„and „DC+“, at the device`s front panel, are ground and

positive potential respectively. It is recommended to use the power supply unit with a galvanic

isolation for supplying the Smart Radon Sensor. The galvanic isolation is of importance in case the

analogue output is utilized AND the 0..20mA inputs of the data log system are referenced to the

ground potential (e.g.: the current signal is transformed into the voltage value through a defined

resist).

Back-up batteries

The device is equipped with an internal backup power supply (UPS) consisting of two LR3 (AAA)

batteries. This feature allows one to continue the measurement seamlessly if main power supply

failure occurs.

Without DC connection the backup will supply the device for approximately two weeks. In such

circumstances the current loop as well as (if present) CO2 sensor will be deactivated, and the LEDs

functionality will be reduced. If the cell voltage drops below 1,0V, then the current measurement will

be interrupted and the instrument enters the standby mode. Once the main powers supply recovers

or new batteries are placed, the stored measurement data will be accessible immediately.

The instrument accepts alkaline as well as NiCd or NiMH batteries. Attention! Do not use lithium-ion

batteries because their cell voltage is 3V or 3,6V. For maximum operational period we recommend

the usage of alkaline batteries which are optimized for low loads.

It is also recommended to insert the batteries prior to mounting the device and connecting the

terminal block. The placement of the batteries is described more in detail in the next chapter.

Important: The real time clock of the instrument must be set by software after inserting the

batteries. The rechargeable batteries cannot be charged once placed in the instrument. For

stationary operation alkaline batteries are recommended. In contrary to rechargeable batteries, the

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alkaline batteries do not suffer from excessive self-discharge process and therefore are able to keep

their initial electrical capacity for over 10 years.

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Batteries replacement

For battery replacement, the rear cover has to be removed. To do that, both screws (A in fig. 3) at

the backside must be unscrewed at first. After that, the cover can be detached by tilting as shown in

picture 4. Please, pay special attention to the correct polarity of the batteries when inserting them

(fig. 5). Change both batteries at the same time because differing charging levels may lead to failures.

Use always batteries of the same type.

Fig. 3. - Remove both screws (A) at the rear

panel.

Fig. 4. - Remove the rear cover. Tilt it at the

round edge as shown.

Fig. 5. - Insert batteries (AAA/LR3) left and right

(take care for right polarity!).

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Selection of the right location for exposure and installation

The instrument should be placed at a location which is representative for the indoor air quality of a

room. The incidence of direct light and exposure to strong heat sources should be avoided. For

permanent installation, the Smart Radon Sensor can be mounted on a wall using a wall mounting clip

(accessory). Attention has to be paid because the wall itself could be the origin of the Radon inside a

room. This would result in an increased concentration in the surrounding of the surface. Some

comparison measurements at the preferred mounting position and in the middle of the room (each

at least a few days under similar weather conditions) will show if this is the case or not.

When the mounting of the device is accomplished the terminal block can be wired. If the batteries

were replaced before the installation had taken place, the internal clock has to be set with Radon

Vision software over USB connection.

Fig. 6. –The wall mounting clip.

Fig. 7. - Smart Radon Sensor with the mounting

clip.

Selection of the right integration interval

It is possible to adjust the sampling interval of the Smart Radon Sensor between 1 and 255 minutes.

From the physical point of view it makes no sense to choose intervals shorter than 30 minutes

because the response time of the instrument is in that order. If the expected Radon concentrations

are in the range or less than the statutory reference level of 300Bq/m³, an interval of 60 minutes

(default setting) should be used. Frequent zero readings for individual sampling intervals indicate

that the chosen interval is too short.

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Measurement

The measurement starts autonomously after replacing the batteries or connecting the main power

supply. The first measurement result will be available as soon as the first sampling interval is

accomplished. Newly acquired values will be appended periodically to the previously stored results.

The measurement cannot be stopped by the user.

Each year the voltage of the batteries should be checked. This can be done e.g.: by using Radon

Vision software and USB connection. Older data in the memory, which are no more needed, can also

be deleted by means of the software.

Radon activity above alarm threshold value (which is settable) will be indicated by LEDs at the front

panel (fig. 1.). Simultaneously the alert switch will be activated. Please refer to the chapters: „LED

indicators” and „Alert Switch”.

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