Probe Par. Probe Par.
Air off (Sm) /FA
Auxiliary temperature 1 (Saux
1)
/FG
Defrost (Sd) /Fb
Auxiliary temperature 2 (Saux
2)
/FH
Air on (Sr) /Fc Ambient temperature /FI
Superheated gas temperature (tGS) /Fd Ambient humidity /FL
Saturated evaporation pressure/temperature (PEu/tEu) /FE Glass temperature /FM
Defrost probe 2 (Sd2) /FF Dewpoint /Fn
MPXone can adjust the values read by the probes. In particular /cA, /cb.../cn are used to increase or
decrease the physical values read by the probes. Parameter /co, on the other hand, corrects the value of
the saturated evaporation temperature calculated directly based on the evaporation pressure. The serial
probes can be calibrated, while the probes shared with the Master (such as the pressure probe) are
calibrated by the Master.
Important: HACCP: this modification may not be allowed by HACCP procedures as it alters the
measured value. Verify that you have authorisation and record the changes where required.
Shared probe
One single pressure probe can be shared across the Master-Slave network; this must be connected to the
Master. Simply configure the probe correctly using parameters /FE, /UE, /LE and on the Slaves set /FE = 0
(function disabled). In this way, the Slaves automatically search for the pressure value shared by the Master
and used for calculating the local superheat. This is used to save on the installation costs of a pressure
probe for each evaporator, assuming that the pressure drop in that section of the line is negligible.
Probe positioning and part numbers
See "Introduction" for the probe part numbers.
Note:
l the glass probe must be connected to the coldest point of the cabinet door, so as to ensure the
anti-sweat device (heater or fans) works most efficiently. See the technical leaflet +050002005;
l for more information see the technical leaflets, downloadable, even prior to purchase, from the site
www.carel.com
The temperature and humidity probes must be positioned not too far from the cabinets being
monitored. At times it is better to install more than one if the supermarket is divided into sections with
greatly differing temperature and humidity values (frozen section, meat section, fruit and vegetable
section, etc.)
Assign probe functions (parameters /FA, /Fb, /Fc)
Code Description Def Min Max UOM User
User
terminal
/FA
Assign air off temp. probe (Sm)
0 = Function disabled 6 = Probe S6
1 = Probe S1 -1 = Serial probe S11
2 = Probe S2 -2 = Serial probe S12
3 = Probe S3 -3 = Serial probe S13
4 = Probe S4 -4 = Serial probe S14
5 = Probe S5
1 -4 6 - S NO
/Fb Assign defrost temperature probe (Sd) - see /FA 2 -4 6 - S NO
/Fc Assign air on temperature probe (Sr) - see /FA 3 -4 6 - S NO
38|5. Functions
MPXone +0300086EN rel. 1.0– 04.09.2018
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