LTH MOD53, Operation Manual

Page: 28 / 110

4 Installation – Surface Mount
27
PRESSURE TRANSMITTER INPUT
The MOD53 can accept a 4-20mA input signal from a pressure transmitter. This
can be scaled within software and permits active pressure compensation of the
dissolved oxygen measurement. The signal can be either 24V loop powered, from
the MOD53, or externally powered from the transmitter. The mode of operation is
selected in the software set-up.
Figure 27 : Pressure Transmitter Connections
{ NB : The negative connection shares the same terminal as the Galvanic sensor
anode connection }
RC2 CLEANER CONNECTION
If the active pressure input is not being used, an RC2 rotary cleaner can be
powered from the
“P” terminal. Connect the cleaner terminals through one of the
relay terminals* in the same polarity as for the active pressure input. Set the “P
Mode” function to “Auto” . Set the Pressure “Input” to “24V Loop” . Reset the
“P Mode” function to “Manual” . Configure the chosen relay (*) to “Cleaning” .