7.3
Exchanging transmitters, probes and electronic inserts
Transmitter
If the Silometer has to be exchanged, the replacement need not be recalibrated. Instead
it is usually sufficient to enter all the matrix values from the old into the new transmitter.
The replacement will then measure correctly.
•
Where a special order has to be maintained, e.g. activation of linearization
after entry of parameters, this should be accounted for during re-entry or the
steps must be performed separately.
For probes and electronic inserts, the procedure to be followed depends upon the type
used.
Capacitance probes
with EC 37 Z/EC 47 Z
For level measurement, provided the sensor constants were entered before calibration,
it is not necessary to recalibrate the instrument when the electronic insert is replaced by
one of the same type. On replacement:
•
the zero frequency (or offset) f
o
and
•
sensitivity S
for the range selected (default Range II) must be entered at V3H5 and V3H6 respectively.
Fig. 7.1 shows where the information is to be found on the EC 37 Z and EC 47 Z inserts.
•
If a different range is selected, the transmitter must be recalibrated.
•
If the constants were not entered a recalibration is necessary.
Procedure
Step
Matrix
Entry
Significance
1
V3H5
e.g. 57.2
Enter zero frequency (offset)
2
-
»E«
Register entry
3
V3H6
e.g. 0.652 Enter sensitivity
4
-
»E«
Register entry
1
3
6
5
4
2
+
I
II
CA (pF)
C(S)(pF)
17
d4
d4 / z4
7
18
d2
d2 / z2
8
FMC 480 Z
FMC 470 Z / FMX 570
FMC 671 / 672 / 676 / 677 Z
HAA 420 Z
1 MHz
EC 47 Z
Ex
0,652
6,805
S
I
II
f
o
475,3
57,2
EC10015EP 8
Fig. 7.1:
Electronic insert EC 37 Z/
EC 47 Z showing location of
probe constants
Silometer FMX 570
Chapter 7: Trouble-Shooting
36
