Vaisala MI, Instruction Manual

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MI instruction manual
Document/Revision No. IM-EN-MI /2.00 Effective: September 2, 2019
6.3.1 Configuring relays
On the relay display, first select the application the relay is used for, then select the
function. After the function is chosen, you get access to those relay parameters that
apply to this function.
Figure 6.6 Configuring a relay
Note: Even though the relays can be configured independently, it is recommended
that if you e.g. set precondition and wash parameters for a certain refractometer, you
set those in the same relay module card.
Important: When you have chosen the settings for the relays, tap
DONE
to save changes
and exit the relay setup.
Parameters LIMIT and HYSTERESIS are used to switch the relay based on concentration
or temperature measurement values by the functions CONC - HIGH LIMIT, CONC - LOW
LIMIT, T - HIGH LIMIT and T - LOW LIMIT. The relay closes on high limit when the mea-
sured value exceeds HIGH LIMIT + HYSTERESIS. The relay opens on high limit when the
measured value goes below HIGH LIMIT - HYSTERESIS. Alternatively, the relay closes
on low limit when the measured value goes below LOW LIMIT - HYSTERESIS. The relay
opens on low limit when the measured value exceeds LOW LIMIT + HYSTERESIS.