www.miinet.com
Moore Industries-International, Inc.
- 114 -
User’s Manual
238-741-00K
May 2019
Programmable Smart HART Temperature Transmitter
THZ
3
/ TDZ
3
SECTION 6
This quality stamp can be one of the following values:
GOOD, BAD, POOR ACCURACY with associated flags HI/LO LIMITED, CONSTANT
The quality stamps on the sensor readings (SEN1 & SEN2) are used in conjunction with the
input quality alarms to determine the quality of Device Variables and/or the AO response.
Input Quality Alarms
The THZ3/TDZ3 also allows the user to determine how certain types of input quality issues are
handled and how they can affect the Device Variables and their mapped Dynamic Variables/AO.
There are 3 different quality alarms: Measurement out of Conformance Range, Allow Limited and
Allow Dropping.
Measurement out of Conformance Range [ON]:
When a temperature reading goes outside the
linear conformance range of the sensor and/or when a value is applied to a custom curve outside
the curve’s range (resulting in extrapolation) the accuracy becomes degraded.
If Allow Measurement out of Conformance Range Alarm is set ON (Default), then the Device
Variable will be stamped POOR ACCURACY
If the alarm is OFF, then the Device Variable is stamped as BAD.
Allow Limited [OFF]:
When a sensor’s value reaches its Upper or Lower Limit it will not be
allowed to go beyond the limit. This typically happens in conjunction with input saturation, and /
or RTD / Thermocouple normalization failure.
If Allow Limited is set OFF (Default), then the Device Variable is stamped as BAD.
If the alarm is ON, then it is stamped as POOR ACCURACY / LIMITED.
Allow Dropping [OFF]:
If two sensor inputs are used, the Device Variables which are calculated
from the sensors reflect the quality of the inputs. ie If SEN1 is BAD then the ABDIF would also
be BAD even if SEN2 is GOOD. The exception to this is BU1-2 and BU2-1 which will be GOOD
provided either SEN1 or SEN2 are GOOD quality.
The Allow Dropping allows certain calculated Device Variables (AVG, LOSEL and HISEL) to
maintain the value of the GOOD sensor to provide higher availability of the reading.
If Allow Dropping is ON then the bad sensor data is dropped from the calculated variable and its
quality shall be set to POOR ACCURACY.
If the alarm is OFF (Default) then the derived variable is quality stamped as BAD.
