Description Of The Signal Inputs And Output; Function Characteristics - ABB AW101 Instruction Manual

Water Hardness Analyzer
AW101 Testomat

4.6 Description of the Signal Inputs and Output

Caution. Connect the signal inputs 'Stop' and 'IN' to volt-free contacts only.
Function
Stop
External analysis stop (for example, via
flow controller or from a process
controller)
IN
Water meter input
Table 4.2 Stop External Analysis Stop
M  BASIC PROGRAM  PROGRAM VALUES  INPUT STOP
Fig. 4.2 Installation Example for the Water Meter
Function
Current 0/4-20mA
Table 4.3 OUT Interface Output
M  BASIC PROGRAM  PROGRAM VALUES  0/4-20 mA

4.7 Function Characteristics

Mode of operation (Analysis controller)

Time Control – internal triggering by a timer. The shortest
interval = 0 minutes between analyses, longest interval =
99 minutes. – see page 9.
The analysis interval is determined by the duration of the
set flush times the programmed (interval) and the duration
of the analysis. The analysis duration is a direct function of
the value to be measured.

Quantity Control – triggered by the water meter. Minimum
interval = 1 liter, maximum interval = 9999 liters. After the
programmed water quantity is measured, the analysis is
carried out. Prior to the analysis, the capillary and the
measuring chamber are flushed (observe the programmed
flush times).
The current analysis interval can be interrupted by initiating
the 'Stop' relay contact.
8
Type of contact
Programmable normally
closed/normally open volt-free.
Normally closed/ normally open
volt-free or turbine
Contract Water Meter
Terminal
max. load 350 Ohm
4 Description of Displays and Operating Features
Action
No analyses are carried out while the contact at the input is
open or closed.
Analysis starts after a configured sample quantity is reached.
M  BASIC PROGRAM  PROGRAM VALUES  WATER
METER
Action
programmable 0 - 20 mA or 4 - 20 mA
Turbine (max. 12V)
+
-
IM/AW101 Rev. C