Number of mes-
sages/day
Annual consumption PLICSMOBILE
Standby energy
demand
Energy demand
for message
transmission
Required bat-
tery capacitance
with 12 V
4 2.6 Wh 32.4 Wh 2.7 Ah
8 2.6 Wh 61 Wh 5.1 Ah
24 2.6 Wh 178.8 Wh 14.9 Ah
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 temper-
ature. The specifications refer to a temperature of 20 °C (68 °F).
4.3 Power saving options
In the DTM (see chapter "Parameter adjustment with PACTware")
you can select under the menu item "Energy options" between the
modes "Permanent 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 trans-
mission). 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 a sensor
connected to PLICSMOBILE are switched on automatically if the time-
controlled message transmission is about. After the correct measured
value is recorded, then the login into the GSM network is carried out
and the measured value sent. Then return to the 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 examples receives the measured value earlier than a
radar or ultrasonic sensor.
Note:
Keep in mind that an event-controlled transmission (measured value/
status-controlled) is not possible in the power saving mode.
With battery operation and a HART sensor with non-required
4 … 20 mA signal, we recommended setting the sensor to multidrop
Permanent operation
Power saving mode
HART multidrop
10 PLICSMOBILE • GSM/GPRS radio module
4 Battery operation and power saving mode
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