OJ Electronics VTH-6202 Instructions

I N S T R U C T I O N S
Type VTH-6202
67230A 10/17 - (KHE)
English
INTRODUCTION
VTH-6202 is an electric sensor for measuring organic components of air.
The sensor communicates via RS485 RTU Modbus and is primarily intend-
ed for measuring air quality in ventilation systems. It is used for monitor-
ing, control and regulation purposes together with an electronic controller,
e.g. in PLC, BMS or SCADA systems. All commands and data exchanged
between the VTH-6202 and the controller are sent as digital values via the
RS485 RTU Modbus protocol. The integrated Modbus communication
makes VTH-6202 attractive for integration with system solutions from OJ
Electronics such as OJ-Air2 or GreenZone™.
PRODUCT PROGRAMME
Type Product
VTH-6202 VOC sensor with Modbus
INSTALLATION
VTH-6202 sensors are installed in the ventilation duct using the accompa-
nying bracket, which must be attached to a firm, level surface by means
of two screws (fig. 4). The 18-30 V DC supply voltage (24 V DC nominal
voltage) is provided via the Modbus connection. VTH-6202 has a pre-fitted
7000 mm cable (fig. 5), which is equipped with a standard RJ12 connec-
tor (fig. 3). The cable may be extended to as much as 50 m without any
negative effects on measuring accuracy. The surrounding EMC environ-
ment must, however, be taken into account and must be capable of being
defined as low. To extend the cable, use a crossover Category 3 extension
cable, RJ12-RJ12, 6P6C. The sensor should be installed in such a way that
the air flow in the duct can pass unhindered through the measuring hole at
the end of the sensor, which should be aligned parallel to the air flow. Al-
though the VTH-6202 is not affected by the position in which it is installed,
it should not be installed in an upright position with the cable downwards
as this may cause moisture to accumulate in the sensor (fig. 2).
TECHNICAL DATA
Supply voltage ...............................................18-30 V DC, nominal 24 V DC, via Modbus
Consumption............................................................................................... 0.13W @ 24V
Modbus .......................................................... RS-485, 24 V DC, RJ12 connector (6P6C)
Modbus protocol ....................... 38.4 kBaud, 1 start bit, 8 data bits, 1-2 stop-, no parity
Modbus address VTH-6202 ................................................................Hex=6E / Dec=110
Modbus connection .................................................................... 1 x RJ12 6/6 connector
Cable length, pre-fitted.......................................................................................7000 mm
Max. cable length ............................................................50 m (in low EMC environment)
Measuring range ............................................................... 450-2000 ppm CO
Measuring accuracy ............................................................. ±300 ppm (450 - 2000 ppm)
Ambient temperature .......................................................................................... 0 – 50 °C
Ambient humidity ...........................................................................................5 – 95% RH
Storage temperature ........................................................................................-25 – 50 °C
Flow rate .................................................................................................................>0 m/s
Startup time .............................................................................................................. 5 min
Response time........................................................................................................ <5 min
Enclosure rating, inside duct ................................................................... IP32 (EN 60529)
Enclosure rating, outside duct ................................................................. IP54 (EN 60529)
Dimensions ................................................................................................ (see figs 1 & 2)
Weight ...................................................................................................................... 175 g
MODBUS
Modbus protocol
• English
The communication protocol is: 38.4 kBaud, 1 start bit, 8 data bits, 2 stop
• Deutsch
bits and no parity.
• Français
Modbus addresses
• Svenska VTH-6202 has the following fixed Modbus address: 0x6E (hex) / 110 (dec).
See the table for a list of available registers.
• Norsk
SERVICE AND MAINTENANCE
• Dansk
VTH-6202 contains no components which require service or maintenance.
The measuring hole at the end of the sensor must, however, be kept free
of dust and dirt so as to allow the free and unobstructed passage of air
through the hole.
Please contact your supplier if faults arise.
DISPOSAL AND ENVIRONMENTAL PROTECTION
Help protect the environment by disposing of the packaging and redundant
products in an environmentally responsible manner.
Product disposal
Products marked with this symbol must not be disposed of
together with household refuse but must be delivered to a
waste collection centre in accordance with applicable
local regulations.
OJ Electronics A/S
Stenager 13B · DK-6400 Sønderborg
Tel. +45 73 12 13 14 · Fax +45 73 12 13 13
oj@ojelectronics.com · www.ojelectronics.com
CE MARKING
OJ Electronics A/S hereby declares that the product is manufactured in ac-
cordance with Council Directive 04/31/EEC (and subsequent amendments)
on electromagnetic compatibility.
Applied standards
EN 61000-6-2:2005 Electromagnetic compatibility (EMC).
EN 61000-6-3:2007 Electromagnetic compatibility (EMC).
equivalent
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© 2017 OJ Electronics A/S
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