VEGA PLICSMOBILE T61 - Manual (Page 22)

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6 Battery operation and power saving mode
PLICSMOBILE T61 • External GSM/GPRS radio unit
37700-EN-130228
Note:
Due to the nature of the system, each battery and accumulator has a
self-discharge which can vary considerably dependent on the type.
This is very important for the calculation of the required capacitance.
In the listed examples, this self-discharge is not taken into accunt. The
available capacitance depends also considerably from the tempera-
ture. The specifications refer to a temperature of 20 °C (68 °F).
6.6 Power saving options
In the DTM (see chapter "Parameter adjustment with PACTware")
you can select under the menu item "Energy options" between the
modes "Continuous operation" and "Power saving mode".
In permanent (non-stop) operation PLICSMOBILE and the sensor
always remain switched on. Only in this mode can the instrument be
used for level monitoring and send an e-mail when a certain level
is reached or an error occurs (measured value/status-controlled
transmission). In permanent operation PLICSMOBILE allows remote
parameter adjustment. Configuration changes on PLICSMOBILE as
well as the sensor can thus be carried out remotely from any PC with
PACTware.
In this mode, the integrated GSM modem as well as the sensor con-
nected to PLICSMOBILE are switched on automatically if a time-con-
trolled message transmission is pending. After the correct measured
value is recorded, the login into the GSM network is carried out and
the measured value sent. The system then returns to power saving
mode. The time for this transaction depends on the connected sensor
type and the network quality and is normally 60 to 120 seconds. A
pressure transmitter, for example, receives the measured value much
faster than a radar or ultrasonic sensor.
Note:
Please note that event-controlled transmission (measured value/
status-controlled) is not possible in the power saving mode. A dial-in
connection for remote parameter adjustment is also not possible dur-
ing the inactive time.
With battery operation and a HART sensor with non-required
4 … 20 mA signal, we recommend setting the sensor to multidrop
mode. In such case, the sensor consumes constantly only 4 mA inde-
pendent of the measured level, which can increase battery life consid-
erably. A description of the activation of multidrop mode can be found
in the operating instructions of the indicating and adjustment module.
Permanent operation
Power saving mode
HART multidrop