P
AGE
18
S
PECIFICATION AND
O
VERVIEW
C
HAPTER
2
WARNING
NOTE
WARNING
The potential free switch of a flow monitor, a timer or any other condition
switch can be connected to this input.
(→ page 26). When the contacts are
open, no analysis will be carried out during the programmed interval. As
an alternative, this input can be used as a start input.
Three potential free Relay Outputs - REL 1 / REL 2 / REL 3
The potential free relay outputs can be used to transmit a limit alarm (REL
1), a unit failure (REL 2) or an active analysis (REL 3) to a control panel
for example
(→ page 25). Alternatively, signalling units or valves may be
activated.
[13]
’BOB’- operation
The abbreviation BOB comes from the German Betrieb ohne Beobachtung (operation
without permanent supervision) and follows a regulation of German TÜV (technical
inspection authority) especially for boiler houses, which requires reliability of
instruments for at least 72 hours.
The REL 2 output may be used to transmit a warning to a remote location
when the reagent needs to be replaced.
Analytical devices of type SYCON 2501 were specially designed for BOB-
operation (operation without permanent supervision). Boiler houses,
running in BOB-operation, require a qualitative monitoring of water
hardness in the boiler feed water according to the technical guideline TRD
604 (`Technische Regeln für Dampfkessel` published by German TÜV).
Analytical devices of type SYCON 2501 record the consumption of
reagent in order to ensure that in periods of operation without supervision,
a sufficient amount of reagent for reliable analysis is available in the bottle.
The sufficient amount of reagent should be calculated independently of
set analysis intervals for the next 72-hour operation.
If the very next 72-hour BOB-operation cannot be reliably guaranteed, an
alarm
“lack of reagent” is issued via relay REL 2.
The reagent stocks can only be calculated correctly if the internal counter
is reset after installing a new 500 ml reagent bottle by pressing the RESET
key combination.
+
NEW REAGENT BOTTLE
•
The device does not recognize the contents of the bottle, but resets
the counter of the metering pump, which then counts back starting
from 500 ml. You can reset the counter to zero only. If the keys are
pressed during an analysis without a new, full bottle of reagent being
installed, the reagent quantity will not be properly calculated, and the
alarm will not be issued on time or at the wrong time. This also applies
if the RESET action is forgotten.
Attention! If no iron is present in the water, no colour change will appear.
If no reagent is dosed, even for water with iron content no colour change
will appear and the reading will wrongly indicate no iron content.
