enraf 862 MIT - Page 9

Commissioning
Instruction manual 862 MIT Page 9
Item Name Description
W2= Protection level 2 Enter protection level 2.
RW MTT wiring request This is a data item which holds the detected wiring sequence from the
thermocouple wiring (blue wires). The wiring sequence must be copied
in item MW.
Item RW can only be read if item MW is set to its default value (all 0’s).
MW= MTT wiring connections Sixteen hexa-decimal characters (default: 0000000000000000).
Give the found wiring sequence from item RW into item MW.
Note 1:
When entering item MW with the Portable Enraf Terminal, the display
will be cleared after entering the 15 character. Continue with
th
entering the last character and press return. All 16 entered
characters will be repeated at the top line of the PET.
Note 2:
To disable the first spot temperature element (Pt100) from the
average product temperature calculation, set the first character of
item MW to ‘F’, and all the others as found in item RW. Only valid
from software versions: MPU B1.3, HPU B2.1 and OPU B1.1.
MK= Sensitive length MTT Format according to item LD (default: +030.0000).
Check the value for the sensitive length of the MTT on the identification
plate of the 864. Enter that value in item MK.
MO= Temperature element Format according to item LD (default: +000.0000).
offset Item MO represents the distance from tank zero to the first temperature
element (Pt100 spot). MO can be found as follows: height mounting
nozzle 864 MTT (with respect to tank zero) - overall length.
MI= Switch hysteresis Format according to item LD (default: +000.1000 m).
The distance MI is a hysteresis around the switching point of the
temperature elements.
MP= Product immersion depth Format according to item LD (default: +000.5000 m).
The distance MP specifies the minimum required liquid level above a
thermocouple before it is taken in the average product temperature
calculation.
MG= Gas immersion depth Format according to item LD (default: +000.5000 m for 854 / 873 and
+000.1000 m for 877).
The distance MG specifies the minimum required distance below a
thermocouple before it is taken in the average gas temperature
calculation.
VR= Reference voltage Internal floating point format. Must be set to: +.18500000E+04.
VT= Test voltage Internal floating point format. Must be set to: +.13567000E+04.
TU= Temperature status One character (default: ‘T’).
conversion This item is used to indicate the temperature status character incase of
a reduced or not guaranteed temperature accuracy.
EX Exit Exit protection level.