MULTICAL® 803
Kamstrup A/S · Technical description · 5512-2360_A1_GB_02.2019
125
7.12
Summer/winter time adjustment
MULTICAL® 803 is available with configuration for DST (Daylight Saving Time ~ summer/winter time). The calculator’s
country code determines the DST configuration algorithm, so that it corresponds to the DST regulations of the
country for which the calculator is intended. If the calculator is configured with DST and you do not want to use it,
the DST-function can be disabled in METERTOOL HCW. The DST function has direct influence on the calculator’s
internal clock and time-controlled tariff limits. Time stamps for loggings of events and values are saved in standard
time together with information on the current DST offset. The current DST offset is imprinted on all logged time
stamps when the DST function is active. The imprinted DST offset is removed for time stamps if the DST function is
deactivated in the calculator and vice versa if the DST function is reactivated.
DST and tariffs: The time-controlled tariff is influenced by the DST offset. For example, the entered tariff limits will be
moved an hour forwards in relation to DST start and an hour backwards at the end of DST (DK example). If the DST
function is disabled after a period in operation, the time limits will always follow standard time. Accumulated energy
in the tariff registers remains unchanged and thus reflects the time limits with enabled DST function. The same
applies vice versa if the DST function is reactivated.
DST and loggers: The logging time follows normal time. For example, a calculator with enabled DST function will log
data at 00.00 during winter time and at 01.00 during summer time (DK example). If the DST function is disabled after
delivery and historical logger values are subsequently read, DST offset of previous values will reflect the new
configuration and be removed from the time stamp. See the example in the table below. Read logging times will
always reflect the current DST status.
DST enabled
DST disabled
Logger target date
Logging time
Logging time
1 January
00:00
00:00
1 February
00:00
00:00
1 March
00:00
00:00
1 April
01:00
00:00
1 May
01:00
00:00
1 June
01:00
00:00
1 July
01:00
00:00
1 August
01:00
00:00
1 September
01:00
00:00
1 October
01:00
00:00
1 November
00:00
00:00
1 December
00:00
00:00
DST and max/min. values: Time stamps on logging of max/min. values follow standard time. If the time stamp of a
value is read, it is stated with current DST offset. If the DST function is disabled after delivery, DST offset is removed
from the time stamps of historical values as it is done with the loggers.
DST and reading of logger data: Data can either be read from a register that includes time in standard time and DST
offset as two separate parameters, or alternatively from a register that includes time comprising DST offset as a
parameter. If the DST function is disabled after delivery, information on DST offset is removed from time stamps
related to the historical values.