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SMV 3000 Transmitter User’s Manual 1/9964
6.8 TempConf Configuration - PV3, Continued
T/C Fault Detect
Select whether to turn on the function for T/C or RTD fault detection.
• ON – Any RTD or T/C lead breakage initiates a critical
status flag.
• OFF
d
– Break in RTD sensing lead or any T/C lead initiates
a critical status flag.
d
Factory setting.
Background
You can turn the transmitter’s temperature sensor fault detection function
ON or OFF through configuration.
• With the detection ON, the transmitter drives the PV3 output to
failsafe in the event of an open RTD or T/C lead condition. The
direction of the failsafe indication (upscale or downscale) is
determined by the failsafe jumper on the PWA, (See Subsection 8.3).
• When fault detection is set to OFF, these same failsafe conditions
result in the transmitter for an open RTD sensing lead or any T/C lead.
But when an open RTD compensation lead is detected, the transmitter
automatically reconfigures itself to operate without the compensation
lead. This means that a 4-wire RTD would be reconfigured as 3-wire
RTD, if possible and thus avoiding a critical status condition in the
transmitter when the transmitter is still capable of delivering a
reasonably accurate temperature output.
Continued on next page