FAQ#116 – How do I configure a WR-Log digital node to read RS485 Sisgeo TIMED sensors?
Sisgeo digital instruments can operate in two powering modes: TIMED or ALWAYS-ON (for more information see F.A.Q.#094).A string of mixed instruments consisting of TIMED gauges and ALWAYS-ON gauges cannot work.The first thing to do is therefore to check that ALL connected instruments in your array are set to TIMED mode.You can check the powering mode […]
FAQ#111 – Why I cannot read correctly my 4-20mA current loop gauge?
It could be a problem connected to the power supply given by the readout or logger. When the power supply is in the current loop (2-wire gauge) it is necessary to consider the effect of voltage drop across the shunt resistor on the voltage applied to the gauge. For example, suppose a 4-20mA gauge requires […]
FAQ#095 – How long does a chain of digital sensors take to be read?
It mainly depends from the powering mode of the gauges (refer to FAQ#094 for the description of the powering modes). AN EXAMPLE WILL BETTER CLARIFY THE ANSWER. In a batch of 240 gauges, unless otherwise requested by the Customer, the addresses are settled from #001 up to #240. In a borehole is installed a chain of 30 […]
Bridge Monitoring on Dnieper River, Kiev, Ukraine
Railway – highway stream crossing with double track railway line and six traffic lanes (three lanes in one direction) across Dnieper River in Kiev City. Total length of the bridge is 1.100 meters. End-of-work scheduled term: end of 2009. Estimated traffic load is more than 300.000 vehicles per day. Load cells are used for monitoring […]
FAQ#076 – Pourquoi est-il nécessaire d’ajouter une résistance de terminaison au dernier capteur numérique de chaque chaîne RS-485?
Tous les instruments numériques SISGEO (IPI, clinomètres, H-Level…) utilisent le protocole de communication série RS-485. Le protocole RS485 requiert l’ajout d’une résistance de terminaison. La connexion recommandée pour une chaîne utilise des nœuds « point à point » (multidropped) en mode bus (line). Les connexions réseau en étoile, circulaires ou ramifiées ne sont pas recommandées. […]
FAQ#075 – What parameters are saved in SISGEO digital sensors? What information must the Customer provide when ordering?
All SISGEO digital sensors (e.g. IPI, BH Profile, MD Profile, LT Inclibus, Tilt-meter, RDS, H-Level, etc.) use the Modbus communication protocol over RS-485 serial. SISGEO digital sensors are connected to each other with a single signal cable. The parameters that are configured at the factory for each digital sensor are as follows: Upon confirmation of […]
FAQ#074 – Quel type d’enregistreur de données est nécessaire pour lire les mesures des capteurs numériques SISGEO?
Les relevés des capteurs sont lus en connectant le câble à une unité maîtresse Modbus (à savoir, OMNIAlog ou miniOMNIAlog) avec une interface RS-485 (DCE, Half duplex, no Echo) en mesure de gérer la communication avec le protocole de communication Modbus RTU SISGEO. La documentation relative au protocole de communication de SISGEO est disponible sur […]
Egnatia Odos Road – Athens, Greece
Egnatia Motorway was designed to the specifications of the Trans-European road network. Across Epirus and Northern Greece from Igoumenitsa to Evros, Egnatia Motorway is one of the largest road construction projects in Europe, 670 kilometres long and 24.5 metres wide.The realisation of this motorway requires the construction of: 50 road interchanges; 350 entrance / exit […]
FAQ#073 – Quel est le nombre maximal de capteurs numériques (RS-485, Modbus), le nombre maximal de chaînes et la longueur maximale du câble dans un réseau RS-485?
Last update: October 2021 All the SISGEO digitized sensors utilize a RS485 interface with Modbus protocol. 1.The maximum number of digitized sensors in a RS-485 network are 247 (theoretical) 2.The maximum number of digitized sensors chains that is possible to connect to Modbus master unit (as OMNIAlog or miniOMNIAlog) are 4. 3. About the maximum […]
FAQ#037 – Quel est le coefficient d’expansion thermique linéaire du câble plat gradué (ruban) des indicateurs de niveau d’eau (WLI) et des sondes de tassement BRS?
Le coefficient d’expansion thermique linéaire du câble plat gradué est de 16x10E-6 m/ °C.
Puerto Cabello-La Encrucujada railway project, Venezuela
The section Puerto Cabello – La Encrucijada (Cagua) is part of a more multi-modal and articulated transportation network of freights and passengers. During the first stage of works, the above said section will connect the principal port of the country (Puerto Cabello) to the industrial, agricultural and food poles of Valencia and Maracay. The next […]
FAQ#012 – Dans quelle mesure la fonction du coulis est-elle importante pour le bon fonctionnement des aimants « araignée »?
Les pattes de l’araignée servent uniquement à maintenir l’aimant en place pendant le coulage du ciment. C’est le coulis qui fixe l’aimant au sol environnant. Le mélange du coulis doit être vérifié (proportion eau/ciment) pendant le coulage du ciment en fonction du type d’application dans le sol