Carbon Monoxide (CO) Gas Detectors
RCO-series
Ventilation Control Products Sweden AB
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Phone: +46-31-811666
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E-mail: [email protected]
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Web: www.vcp.se
April 2020
Wall mount version:
Fix the device on a wall by screws, using cross-shaped mounting lugs supplied with the instrument
(see dimensional drawing below).
Duct mount version:
Cut hole with a diameter of 36-45 mm in the air duct at the chosen mounting place.
Place the rubber flange aligning the holes in the flange and the air-duct and fix the flange with four self-tapping screws.
Pass the sensor probe through the flange and adjust it to the appropriate depth.
Unscrew four lid screws and detach the lid from the transmitter.
Use two M16 cable glands to pass the cables of the power supply and of the external devices.
Plug the power cable and connect the analog outputs and/or digital interface terminals to the relevant devices according
to the connection diagram.
The screw less quick connect spring terminals on the Detector devices are
suitable for a wide range of wires with cross-section 0,2...1,5 mm2.
We recommend to strip the wire end by 8...9 mm and tin it, or to use the wire end sleeves.
To connect the wire, insert the wire end into terminal hole.
To disconnect, push the spring loaded terminal lever, pull the wire out, and release the lever.
Use twisted pair cable, e.g. LiYY TP 2×2×0,5 mm2 or CAT 5, to connect the device to RS485 network.
Use one pair for A and B wires and the second pair for common 0 V and power +U wires to connect the transmitter to Fieldbus network.
Respect polarity.
Overall length of all connections via RS485 interface should not exceed 1200 m.
The type of each analog output can be independently changed between 4- 20 mA and 0-10 Vdc with jumpers J1 (OUT1) and J2 (OUT2).
With closed jumper the output is 0-10 V, with open jumper the output is 4-20 mA.
By default both outputs OUT1 and OUT2 are assigned to gas concentration.
The device has built-in temperature sensor which may be tied to any of the outputs.
The output assignments and scales can be changed by Modbus commands.
NOTE If you use a version with LCD, only OUT1 is available.
Turn on the power.
The sensor heating up may take up to five minutes after switching on.
During this period relays, analog outputs and Modbus interface are off.
A LED placed on the PCB of the device allows to control the connection process.
The LED response to different processes is presented in the table below.
Make sure that the transmitter is properly fixed, the external devices connected, power on and control LED is constantly lit.
Place the lid back and fix it with the screws.
The device is ready to use.
It is recommended to keep the device on constantly, except for periods of maintenance and calibration, replacement etc.