Average temperature measurement with VITO temperature probes
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Instruction manual VITO Page 17
2.4 Troubleshooting
2.4.1 Temperature error request (item EM)
This item helps you configuring correctly by the most recent temperature error encountered by the option board.
xx00 No error, value at initialisation
xx11 No reply on initial HART commands Communication error. Check connection level gauge – 762 VITO interface, or
change 762 VITO interface or option board.
xx50 Pt100 (or spot 0) error Brown wire connected to CN1 A-1 (or orange wire connected to CN2B-1) not
connected .
xx51 Spot 1 (or Pt100) error Blue wire to CN2B-1 (or brown wire to CN1A-1) not connected
xx52 Spot 2 error Blue wire to CN2A-2 not connected
xx64 Spot 14 error Blue wire to CN5A-2 not connected
xx65 Spot 15 error Yellow wire to CN5A-1 not connected
xx70 Sub-system error Data from 762 VITO not valid. Reset instrument; if error persist, replace
762 VITO interface
or, open Pt100 wiring (red – brown wires)
xx71 Wrong probe connection Thermocouple wires of VITO sensor connected wrongly (blue and yellow wires)
or, isolation resistance VITO sensor too low (replace VITO probe)
xx77 Wrong Pt100 connection Brown and red wires of VITO sensor connected wrongly
xx80 R
test
error Measurement on test resistor failed. Reset instrument; if error persist
replace 762 VITO interface or VITO probe
xx84 Standard deviation too large EMC influence (check cable shields) or defective 762 VITO interface
xx92 No data available Communication error between 762 VITO interface and level gauge. Check
wiring; replace 762 VITO interface or option board.
xx98 No temperature sources found No VITO temperature probe (and no RTD) connected
xx: 22 for MPU emulation With error codes xx50 to xx65, connector numbers are mentioned
24 for HPU emulation Refer to Installation guide 762 VITO Interfaces & VITO, MTT, LT and MRT probes
30 for HCU emulation for the location of these connectors.
2.4.2 Temperature status request (item MQ)
Temperature status request item contains four status bytes (Byte 0, Byte 1, Byte 2, Byte 3) of the option board.
For decoding, refer to the ASCII table in appendix A.
Status byte 0:
Contains the characters ‘0’ ÷ ‘F’, indicating the highest submersed spot element of the temperature probe.
At start up: ‘I’.
Status byte 1: Status byte 2:
Bit 0: General temperature fail Bit 0: Last valid level used
1: Fail in average product temperature 1: Manual level used
2: Fail in average gas temperature 2: Level time out
3: Level exceeds lowest spot element 3: Device not calibrated
4: Level exceeds highest spot element 4: Exceeding differential temp, range
5: Spot element fail (one or more spots defect) 5: Out of specified temperature range
6: 1 6: 1
7: 0 7: 0
Status byte 3:
Bit 0: No previous store command
1-5: 0
6: 1
7: 0
Note:
Only the bits which are set to ‘1’ have an active status.
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