ProMinent DCM 2 Series, Руководство по установке, Страница: 18 / 37

DCM 2 Installation
Page 18
2.3.3. Flow switches, Contact Sets,
and Water Meters
Water meters, flow switches and ‘dry’
contact sets are connected to input
terminal ‘F’ and a ground terminal. 5VDC
limited by >10K
Ω
puts less than 0.5 mA
through a closed contact set. Input ‘E’ is
reserved for the sample flow switch
function and cannot be changed.
Paddlewheel and Turbine water meters
(Square Wave types) are powered by the
12VDC controller power supply, and
thermally fused at 100mA.
Connect cabling shields at the controller
ends of the cable only, to any ground
terminal either on the Measure Card or
on the bottom center of the aluminum
back plate.
The flow switch provided by
ProMinent is not meant to detect main
recirculation flow.
It is meant to detect the loss of sample
flow, and interrupt chemical feed
accordingly.
A generally accepted safety practice of
installing an additional safety switch
for main recirculation flow is highly
recommended, and included as input
“F”, on connection “RP”.
WARNING!