The Remote Monitoring Unit 2 (RMU2) is a reliable device with exceptional lightning immunity, designed to monitor rectifiers, bonds, test points, test element groups (TEGs) and solar applications. The product is available in satellite (RMU2-S) or GSM Cellular (RMU2-G) communication configurations.
The RMU2 field hardware consists of two primary components: a small measurement terminal block (RMU2-B) mounted inside the rectifier; and, a satellite or cellular antenna transmitter that is externally mounted with a clear view of the sky. These components are connected by a moulded M8 instrumentation cable, environmentally sealed and electrically isolated from the ground – which provides lightning immunity.
Features and functions of the RMU2 include:
- Monitoring and one-way transmission of nine information channels from the field to the corView system;
- Measurement of temperature and internal battery voltage;
- An non-contact AC line presence sensor to determine if AC line voltage is present;
- A magnetic sensor, which can be used as a rectifier door sensor or tamper detection alarm;
- The device is powered by five (RMU2-S) or six (RMU2-G) low cost, replaceable AA 1.5V lithium cells located in the units that provide an operational life of seven years for the RMU2-S and six years for the RMU2-G; and,
- A user accessible switch allows the transmission of uniquely identified messages that can be used to record site visit information.
The units also have four accurate, galvanically isolated, AC/DC capable analog inputs, which are used to monitor volts, amps and/or 4-20mA signals from external equipment. For special applications, any of the four analog channels can be field configured for use with 4-20mA current transducers. Each of these channels is capable of measuring DC (bipolar) or AC (true RMS) signals up to 165 VDC/115 VRMS. Each channel supports three voltage ranges – 150mV, 20V, 165V FS – to accommodate a wide range of sensors.
corView field data communications
Measurement data is wirelessly transmitted from the RMU2 device to the Mobiltex corView servers. corView is a web-based service, which manages all field data communications, stores three years of measurement data, sends alarm exception and system performance emails, and provides password protected remote customer access. With the proper credentials, corView can be accessed using an Internet Explorer web browser.
The measurement data is presented in an intuitive manner that colour codes any abnormal measurements or site conditions to enable quick user interpretation. corView can also provide near real-time email notification of abnormal measurement and alarm conditions. Low battery warning conditions are automatically transmitted and displayed on the corView web monitoring site.
The RMU2-B has an environmentally sealed “˜test’ button to allow field personnel to manually initiate a measurement cycle and near immediate satellite or cellular transmission. This transmission is identified on the corView website, allowing site visits or inspection activities to be recorded.
The RMU2-B also has a dual colour LED indicator, which indicates when the device is actively taking measurements, the state of the inductive AC line voltage presence sensor, low battery alarm and error conditions. The device can be field configured using the optional RMU2-PGM configuration interface and a PC with an available USB port.
The device takes a set of measurements every six hours. To minimise airtime costs, the device stores four sets of periodic readings and then transmits all four sets of readings in a satellite or cellular transmission. The device can be factory configured for one of four types of data reporting plans, depending on the frequency of data transmission required by the user.
The corView website has a watchdog feature that monitors the periodic transmissions and alarms sites that have not reported within the expected time window. corView can be user configured to automatically email alarms, alarm clears and system fault information to the appropriate field personnel.
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