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RWS Series 

Visibility Weather Sensors 

RWS-20 

QUICK START GUIDE 

Summary of Contents for RWS Series

Page 1: ...RWS Series Visibility Weather Sensors RWS 20 QUICK START GUIDE ...

Page 2: ... lists is proprietary to BIRAL It is provided for the sole purpose of aiding the buyer or user in operating and maintaining the instrument This information is not to be used for the manufacture or sale of similar items without written permission COPYRIGHT NOTICE No part of this manual may be reproduced without the express permission of BIRAL 2022 Bristol Industrial and Research Associates Limited ...

Page 3: ...TURES 5 3 SENSOR CONNECTIONS 6 3 1 CONNECTING POWER 6 3 2 CONNECTING COMMUNICATIONS 7 3 3 CONNECTING ANALOGUE OUTPUTS 8 3 4 CONNECTING THE RELAYS OPTIONAL 8 3 5 CONNECTING THE FERRITES 9 4 CONFIRMING THE COMMUNICATIONS 10 5 CONFIRMING THE OUTPUTS 11 5 1 ANALOGUE SIGNAL CHECKS 11 5 2 RELAY CHECKS 11 6 SENSOR INSTALLATION 12 6 1 MOUNTING DETAILS 13 6 2 ELECTRICAL GROUNDING PROTECTION 14 7 MAINTENANC...

Page 4: ...in 104736 Split 105449 Mounting saddle 2 105356 Clip ferrite 2 105457 Cable gland sealing plugs Fitted to sensor 2 x M12 2 x M16 M12 M16 M12 106185 M16 106186 Quick start guide This document 1 107207 Calibration certificate 1 N A You may also have Calibration kit optional 1 105634 The calibration kit is in a protective carrying case containing a calibration plaque a mounting arm referred to as the...

Page 5: ... 9600 configurable between 1200 to 57600 baud 0 10v EXCO MOR Optional features Configurable option Default Additional optional settings 4 20mA EXCO MOR Relays Fault RL1 1km RL2 2km Fault RL1 1km window contamination Relays Disabled This Quick Start Guide assumes the most common Default settings are required Should you require any of the optional settings the User Manual gives comprehensive details...

Page 6: ...rn 24VAC or DC 20 26AWG 0 5 0 13mm2 J11 C Power 9 to 36V DC Supply 20 26AWG 0 5 0 13mm2 J11 D Power 0V Supply 20 26AWG 0 5 0 13mm2 J11 E F Not Used 20 26AWG 0 5 0 13mm2 This sensor MUST BE EARTHED Failure to install a suitable earth may result in inaccurate readings and or damage to the sensor Failure to install an earth when using mains voltages on the relays will make the unit potentially unsafe...

Page 7: ...r Designation Wire size J12 A RS232 common 0V 20 26AWG 0 5 0 13mm2 J12 B RS232 Tx signals FROM sensor 20 26AWG 0 5 0 13mm2 J12 C RS232 Rx signals TO Sensor 20 26AWG 0 5 0 13mm2 Pin connections for RS422 485 Pin Number Designation Wire size J12 A RS422 485 common 0V 20 26AWG 0 5 0 13mm2 J12 D RS422 RS485 Rx TO sensor 20 26AWG 0 5 0 13mm2 J12 E RS422 RS485 Rx TO Sensor 20 26AWG 0 5 0 13mm2 J12 F RS4...

Page 8: ...type For the relay connectors strip back wire insulation by 5mm Relays are rated at 250Volts AC 2Amps Pin connections for Relay connections Care must be taken to ensure that the voltage rating of the cable is correct for the switching application requirement If the relays are to be used with mains voltages please comply with all national and international safety regulations A protective earth bond...

Page 9: ...c noise The ferrites supplied with the unit should be clipped over the power and the signal leads between the gland and the connector blocks Ferrites are not required on the relay connections or on the hood heater supplies This sensor MUST HAVE FERRITES INSTALLED Failure to install the supplied ferrite cores may result in inaccurate readings or lost communications Figure 5 location of the ferrites...

Page 10: ...nterface Software Available to download at htttp www biral com technical support downloads software downloads 2 Ensure an earth connection to the chassis and power connected to J11 C D 9 to 36V and 0V 3 Connect to the Biral Sensor interface software using default 9600 baud 4 Apply power to the sensor If communications are working the sensor will respond with Biral Sensor Startup 5 Check Data Trans...

Page 11: ...he current output should not be terminated with a resistance greater than 500 Ω to enable a maximum of 20mA to be available The voltage should be read across a resistor greater than 10K Ω The RWS analogue outputs can be configured for MOR or EXCO default output See manual for details Use the following formulas to convert voltage or current readings to MOR or EXCO 0 10v 4 20mA Optional MOR output M...

Page 12: ...ir flow Care should be taken to ensure that the sensor is situated away from objects that disrupt the normal flow of air to and through the sensor sampling volume for example walls trees and other equipment etc It is recommended for the RWS sensor To be mounted with the sensor facing away from the traffic not less than 3 metres away from a road to avoid spray contaminating the lenses No vegetation...

Page 13: ...DETAILS Any glands not in use should be sealed with the supplied sealing plugs to retain the integrity of the weatherproof housing The U bolts fit a standard mounting pole of 40 64mm diameter Figure 6 Mounting details ...

Page 14: ...ven the driest periods 2 13mm2 solid copper wire should be used to connect the instrument and thus the transient voltage suppressers to the Ground Rod Use the shortest and most direct paths to the ground Simply connect the wire between the Earth Stud provided on the front of the lower mounting flange of the instrument and the Ground Rod 3 System Interconnections Eliminate all isolated ground loops...

Page 15: ...ocal conditions 7 1 CALIBRATION CHECK RWS sensors are electronic instruments and a calibration check should be performed at regular intervals to ensure continued accuracy of the data Calibration equipment is required for this 7 2 WINDOW CLEANING RWS sensors are optical instruments and are therefore susceptible to accumulation of contaminants on the windows in the hoods The windows should be cleane...

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