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Atlas MiniLogger - Overview
The Atlas MiniLogger is RT/E/S/11304 compliant and is available in three forms; analogue, digital and serial. Each variant requires a nominal 12VDC supply, which will also maintain charge of the internal batteries where fitted. The controller board dictates the size of the casing and is common to all three variants. The controller has 8 x isolated digital inputs and two relay digital outputs, an RS-232C port for GPS and local configuration/diagnostics and an Ethernet port for LAN/local communications. The GSM/GPRS adaptor is by Comtech.
The MiniLogger is primarily intended for temporary deployment, e.g. in a LOC, but may also be used for fixed monitoring where only a small number of signals are involved. The case is plastic to avoid any possibility of shorting out circuits within a LOC. The antenna for the GSM/GPRS adaptor (and receive only for the GPS clock if fitted) would be fitted on the top of the LOC to minimise any leakage of radiation back into the LOC itself.
The digital input circuitry employed is identical to that used for Atlas digital event logging (PADS approval number PA05/02105). The analogue input circuitry employed is almost identical to that used for Atlas Points Condition Monitoring (PADS approval number PA05/00953). All signal connections are made via two part connectors.
All variants are supplied in the same enclosure but each variant has its own design for the two end plates, giving the user the LED indicators and labelling appropriate to the variant supplied.
Analogue MiniLogger
Two electronically identical analogue boards can be fitted, each capable of accepting 3 x isolated analogue inputs in any mix of 0-20 mA, 4-20 mA, 0-5 V or 1-5 V together with a non-isolated thermistor input for monitoring e.g. ambient temperature. Each high level analogue input includes its own independent isolated 24VDC sensor power supply. The Analogue MiniLogger therefore accepts a total of 6 x isolated analogue inputs and 2 x non-isolated thermistor inputs plus the 8 x isolated digital inputs and two relay digital outputs on the controller.
It is also possible to fit just a single analogue input board, leaving space above it to fit a battery board (not shown in the photograph, in which two analogue boards are fitted). The battery board will not power the analogue inputs but allows the unit to report that the external supply has failed and will also give up to three days autonomous operation of the digital inputs.
Digital MiniLogger
One digital board can be fitted, capable of accepting 8 x isolated digital inputs.
The Digital MiniLogger therefore accepts a total of 16 x isolated digital inputs (including the 8 x isolated digital inputs on the controller) and two relay digital outputs also on the controller.
A battery board, fitted above the digital input board, gives up to three days autonomous operation.
Serial MiniLogger
One serial board can be fitted, capable of accepting 2 x RS-232C or 1 x RS-232C and 1 x RS-485 serial input. The Serial MiniLogger therefore accepts a total of 2 x serial inputs plus the 8 x isolated digital inputs and two relay digital outputs on the controller.
The RS-232C terminations are via 9 way ‘D’ connectors, whereas a 2 part connector is provided for the RS-485 option. As with the analogue and digital variants, a battery board is available for the serial MiniLogger. This is fitted above the serial board but is not shown in the above photograph