Objectives

The primary objective of this tender is to procure an advanced GSM telemetry data logging system that integrates seamlessly with Johannesburg Water’s existing infrastructure. The system aims to enable remote monitoring, data acquisition, and control of water infrastructure assets across various harsh outdoor environments. It also seeks to ensure secure data hosting, support for custom scripting, and integration with JW’s SCADA platform, thereby enhancing digital infrastructure within the Smart City initiative.

Scope

The scope includes the supply, configuration, installation, and commissioning of intelligent, battery-operated remote data loggers. These devices must interface with existing field instrumentation via Modbus RTU, transmit data over GSM/4G telemetry, and host raw data on JW’s servers. Deployment will cover diverse water infrastructure assets such as reservoirs, underground chambers, roadside kiosks, and utility enclosures. The project also encompasses SCADA interfacing, web hosting, and ongoing support for firmware updates, remote configuration, and data management.

Technical Requirements

• The data loggers must operate reliably in extreme outdoor environments, with an ingress protection rating of at least IP-67, and temperature range from -20°C to +80°C.
• Units must be programmable with at least 5 configurable multi-purpose inputs/outputs, supporting analog, digital, counter, 4-20mA, switch, and boost output functionalities.
• Internal sensors required include GPS (accuracy within 5m), 3-axis accelerometer, and tamper detection.
• Communication ports must include RS-485 Modbus-RTU master port capable of interfacing with multiple slave devices, Wi-Fi for local configuration, and GSM-4G LTE for remote data transmission.
• The units must have an onboard web server for remote configuration via Wi-Fi, supporting firmware updates and configuration changes off-site.
• Battery life must support at least 8 months of continuous operation at logging intervals up to 5 minutes, with easily replaceable batteries that do not void warranties or IP ratings.
• Support embedded scripting for on-device data processing, alarms, and local control, with remote update capabilities.
• Data transmission protocols include MQTT or HTTP(S), with data sent to JW’s SCADA via OPC-UA interface, fully compliant with JW telemetry standards.
• The system must support web hosting for data access via internet, replicating HMI and trending features of the existing SCADA system.

Skills Requirements

• Proficiency in configuring and programming remote data loggers, including scripting and firmware management.
• Experience with Modbus RTU, RS-485 communication protocols, and integration with SCADA systems, particularly Adroit version 10.
• Capability to develop and deploy custom scripts for data processing, alarms, and local control functions.
• Knowledge of secure web server configuration and remote device management via Wi-Fi and GSM networks.
• Skills in hardware installation and commissioning in outdoor, harsh environments.
• Experience with hosting and managing web-based SCADA interfaces, including trending, alarming, and reporting functionalities.
• Ability to develop detailed SOPs and FDS for system deployment and operation, with capacity for in-house SCADA system integration if required.