9.3 Exchanging transmitters or probes
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/down-
loading or the steps must be performed separately.
• In the case of level measurement with automatic calibration correction,
however, the limit probe must be recalibrated, unless the matrix values are
downloaded via the ZA 67… computer interface.
For sensors, 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.
On replacement:
• the zero frequency (offset) f
o
and
• sensitivity S
for the range selected (default = II) must be entered at V3H5 and V3H6 respectively.
Fig. 9.1 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
EC 17 Z insert If the capacitance probe was used for limit switching, a recalibration is necessary.
1 3 6542
+
I
II
CA (pF)
C(S)(pF)
17
d4
d4 / z4
7
18
d2
d2 / z2
8
FMC 480 Z
FMC 470 Z
FMC 671 / 672 / 676 / 677 Z
HAA 420 Z
1 MHz
EC 47 Z
Ex
0,6526,805
S
III
f
o
475,3 57,2
EC10015EP 8
Fig. 9.1:
Electronic insert
EC 37 Z/ EC 47 Z showing
location of probe constants
Silometer FMC 671 Z/676 Z Chapter 9: Trouble-Shooting
54
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