5.2 - Service electronics
M2007/3en
TCT-2301 Service instructions
85
©BTG 2004
6.2. Wrong SPC version
SPC-1000/A is required (an
upgraded version of SPC-
1000 is needed as in sec-
tion 4.1)
6.3. Not 250
Ω
in 4-20mA
measure loop
If connected to the DCS,
ensure the loop has a resis-
tance of at least 250
Ω
.
If not connected to DCS
there has to be a resistor of
250
Ω
connected between
”+AOUT” and ”-AOUT”.
6.4. The analog output signal
is not between 4-20 mA
See point 4. above.
6.5. Connector bad or loose
Check the connector from
SPC to electronics card.
See section 5.2.6.
6.6. SPC/Hart communication
circuit is interrupted
Change the whole electron-
ics card. See section 5.2.4.
7. Clear water calibra-
tion can’t be made
7.1. Optical cable is not
connected into
electronics box.
Connect the probe optical
connector.
See section 3.3.3.
7.2. Optical cable is damaged Change the complete probe
and optical cable. See sec-
tion 5.3.3.
7.3. LED circuits on card is
interrupted.
Check testpoint ”TP3” with
”LED intens” set to 100%
according to section 5.2.3.
If values are no good
change the electronics card
as in section 5.2.4.
Symptom
Probable cause
Solution