12 A-96.250.111 / 211019
AMI Trides
Product Description
Amperometric sensors measure mainly the hypochlorous acid.
Therefore, the higher the pH value is, the lower the current of the
sensor.
A pH compensation of the sensor signal is necessary to be able to
compare the value directly to the DPD method. For that select
<Free chlorine> in menu 5.1.3 <Installation/Sensors/Disinf.> The
pH must be measured by an optional pH electrode or be pro-
grammed correctly.
Hypochlorous
acid
If hypochlorous acid is chosen as disinfectant in 5.1.3, the pH com-
pensation is switched off. The displayed values show the efficiency
of disinfection. Only during correction, the value is shown as free
chlorine and can be therefore directly compared to the manual DPD
value.
Free Chlorine
+ HOCl
If you program Free+HOCl (HOCl=hypochlorous acid) as disinfec-
tant in 5.1.3 you can set the hypochlorous acid as parameter on the
signal outputs. The displayed value will be free chlorine.
On-line
operation
The sample enters at the sample inlet [E]. It passes the filter vessel
[G] and the flow regulating valve [D], where the sample flow is ad-
justed, and fills the constant head [A]. Sample must always over-
flow via the overflow tube [B] into the waste to ensure constant
pressure at the Trides sensor [F].
A part of the sample flows through the overflow tube [C] to the Tri-
des sensor [F], turns the rotor and leaves via sample outlet [H] into
the waste. The rotation of the rotor is detected with a Hall-effect
sensor to assure the sufficient sample flow. An inconsistent sample
flow causes the rotor to turn slowly (or stop) and produces a system
error.
Grab sample The grab sample outlet is used to take sample from the Trides con-
stant head. This sample is used to make a comparison measure-
ment with an other instrument.
The standard method to correct the AMI Trides is the DPD photo-
metric method. Use a high quality photometer to determine the ref-
erence value, e.g. Swan Chematest.
To Next Page
Loading...