Power Supply; Area Of Application - RMG TME400-VM VMF Series Operating Manual

TME400-VMF
In addition to the features of the TME400 VM, this version can be used for custody-
transfer applications.

Power supply

1.3.3.
Battery-operated device
The TME400 is equipped with a replaceable 3.6 V lithium battery. The device is
designed for continuous operation for approximately 10 years. To achieve this, the
devices may be operated for a maximum of 15 minutes per day with input pulses of
1 Hz.
Battery-operated device with additional external power supply
An electric supply of the TME400 via the 4-20mA current loop reduces the power
consumption from the batterie and typically extends the service life of the battery to
more than 12 years.
If the TME400 is additionally electrical powered by the RS485 interface, the service
life of the battery is typically extended to clearly more than 12 years.
Battery replacement indicator
The remaining battery life is determined by means of an internal calculation. An indi-
cator in the display appears when it is time to replace the battery. Battery replace-
ment is described in chapter 3.1.4 Battery replacement. In parameter G20 Date of
last battery change the date of the last battery change is displayed (see chapter 4.3.3
Coordinates in context).
Note
In case of a loss of the external power supply, the TME400 is supplied by the
buffer battery. The battery symbol is blinking in this case.

Area of application

1.3.4.
The TME400 is approved for use in hazardous areas with the following mark:
II 2G Ex ia IIC T4 Gb
Manual TME400-VMF · EN07 · December, 7
1 Introduction
17
th
2020