Honeywell STT850 Series - Page 58

Page 48 STT850 Series HART/DE Option User’s Manual Revision 4.0
Online/Device
Setup/Sensors
Sensors
LRV to MRV range if the Sensor 2 input drops
below the MRV, allowing for hysteresis.
Excess Delta Detect: Select to Enable or Disable
Excess Delta Detection. When Enabled, an alarm will
be triggered when the Delta PV (Sensor 1-Sensor 2
difference) exceeds the configured Delta Limit.
Break Detect: Select to Enable or Disable Sensor
Break Detection. It is highly recommended to keep this
option Enabled. If there is a break or open in either
Sensor input, and Break Detect is Enabled, a Critical
Status will be generated. If Break Detection is
Disabled, no Critical Status is set and the input value
will be unreliable.
Match PV: Select to Enable or Disable the Match PV
option. When Enabled, the Sensor 2 value will be
adjusted (offset) to be exactly equal to the Sensor 1
value. This is a one-time correction, but the offset will
remain for the Sensor 2 measurement as long as the
option is enabled. Disabling this option will return the
Sensor 2 value to true measurement.
CVD:
CVD menu will be
seen only when
sensor type is
configured as
RTD
CVD: Displays parameters which are required to
configure the CVD.
CVD1 Activate: Can be configured with any of the
below
a) CVD1 ON
b) CVD1 OFF
CVD2 Activate: Can be configured with any of the
below
a) CVD2 ON
b) CVD2 OFF
CVD1 Coefficients: This will be seen when CVD1
Activate is ON
a) CVD1 Low Limit: A read only floating point value
b)CVD1 High Limit: A read only floating point value
c) R0: A Floating Point Value
d) Alpha: A Floating Point Value
e) Delta: A Floating Point Value
f) Beta: A Floating Point Value
CVD2 Coefficients: This will be seen when CVD1
Activate is ON
a) CVD2 Low Limit: A read only floating point value
b) CVD2 High Limit: A read only floating point value
c) R0: A Floating Point Value
d) Alpha: A Floating Point Value
e) Delta: A Floating Point Value
f) Beta: A Floating Point Value