Page 37 of 49
TTI-22 Iss.04– 11/15
Appendix C: Troubleshooting
C.1
TTI-22 Error Messages
If errors occur during TTI-22 operation, an error message is displayed.
Error message
Cause
Correction
"ADC ERROR OUT OF
RANGE"
The sensor is damaged or the TTI-22
ADC is defective.
Contact your Isotech representative or
apply a different sensor.
"CALIBRATION
RANGE"
• The sensor parameters were
entered incorrectly or with a
wrong algebraic sign.
• The temperature range
entered (IEC751) or selected
(ITS-90) at the sensor
parameters was underrun or
overrun.
• Check the entered parameters.
• Assign another calibration with
appropriate temperature range to the
sensor channel.
"MAX TEMP
EXCEEDED"
The sensor was heated to a
temperature higher than the
maximum entered in the calibration
data.
"Max.Temp." is displayed in the line
"Cal.Time".
Calibrate the sensor again and enter
the new calibration parameters.
"NO SENSOR
CALIBRATION"
No sensor parameters were assigned
to the channel.
Assign sensor parameters to the
channel.
"RREF CAL. TIME"
The calibration time of the reference
resistor is over. A negative digit is
displayed in the line "Cal.Time".
Calibrate the reference resistor and
enter a positive digit at
"Rref:CALTIME".
"SENSOR CAL. TIME"
The calibration time of the selected
sensor is over. A negative digit is
displayed in the line "Cal.Time".
Calibrate the sensor and enter the
new calibration parameters (including
the calibration time).
"SENSOR NOT
CONNECTED"
No sensor was connected to the
sensor channel.
Connect a sensor.
"WRONG RREF
SELECTION"
The actual value of the reference
resistor differs too much from the
entered value.
Calibrate TTI-22 again and enter a
precise value.
