Vega PLICSMOBILE T61 User Manual download pdf (Page 22)

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specications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.CongurationchangesonPLICSMOBILEas

well as the sensor can thus be carried out remotely from any PC with

PACTwa re.

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

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Vega PLICSMOBILE T61 User Manual Page 22

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