User's Manual

Technical description
13
2.4 Power supply
The device is powered by two internal Lithium batteries.
The effective lifetime of the batteries strongly depends on which functions are used and
how often they are used.
Using the following settings and under the following conditions a logger can be operated
for up to five years without changing the batteries.
Parameter Setting
Channel 1 Internal pressure sensor
Channel 2 External sensor; Input signal: Pulse
Channel 3 External sensor; Input signal: Pulse
Channel 4 External sensor; Input signal: Pulse
Log interval 15 min
Event Number
Data transfer via GSM Once a day (SMS / e-mail / FTP upload)
Pressure surge recording Once a day
Alarm events per day No
In order to obtain information about a logger's battery condition, you can call the
'program' input screen of the SDV-3 software. For that, select the relevant logger in the
directory tree and click on Program in the menu bar. The State segment, inter alia,
provides information about the battery (see page 40).
When the batteries get low, the logger switches itself off. Measurement data, logged up
to that point, remain safely in the loggers’ memory until the next programming.
Empty batteries cannot be recharged. They need to be replaced. The battery
replacement must be carried out by SebaKMT or an authorized service station, in order
to warrant the loggers’ protection against water and dust ingress.
In order to expand the operating time of the measuring system, the data logger can be
supplied by an external energy source.
The Logger is connected to this source using the VK 76 connection cable (see page 24).
• Supply voltage: 12 V
• Supply current: approx. 0.5 A (if the GSM function is not used)
approx. 1.5 A (when using the GSM function)
NOTE
Peaks of 4 A can occur.
Battery lifetime
Battery status
Empty batteries
External power supply