13
PV ERROR TYPE
ALARM TYPE
ALARM STATUS
Under-range
Over-range or Open
Process Low
Process High
Negative Deviation
Positive Deviation
Window Band
Process Low
Process High
Negative Deviation
Positive Deviation
Window Band
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
ON
Table 2.3
SENSOR BREAK PROTECTION
The controller facilitates the Sensor Break Protection for Temperature Sensors like Thermocouples (J, K, T, R, S, B, N &
Reserved) and RTD Pt100 as described below:
• The broken or open sensor is indicated by flashing OPEN (Sensor Open) as Sensor Break Indication on the controller
Upper Readout and the alarm is activated if set as ‘Process High’.
• While detecting Sensor Break, the PV
rises rapidly before Sensor Break Condition occurs. The Sensor Open/Break is
detected by an Overrange input signal exceeding the maximum of linearisation table.
• Upon detecting the Sensor Break Condition, the controller enters into Open Loop mode and depending upon the ‘Sensor
Break Strategy’ selected, the controller maintains the Valve at the Position that it was maintaining prior to sensor break
condition or fully close or fully open until the Sensor Break Condition is removed.
(For more details on ‘Sensor Break Strategy’, refer
Section 6: Configuration Parameters.
)
User Manual
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