www.miinet.com
Moore Industries-International, Inc.
- 125 -
User’s Manual
238-760-00K
May 2019
Functional Safety Dual Input Smart HART® Temperature Transmitter
STZ
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SECTION 8
Figure 8.2.
Temperature is often a critical measurement in reactors, especially processes with the potential for thermal
runaways due to exothermic reactions. Utilizing the failover/backup feature with dual sensor input on the STZ can help
your Safety Instrumented System (SIS) mitigate potentially dangerous situations.
Dual Sensor Input Gives You Expanded Measurement Capability and
Protection
With Dual Input sensors, the STZ simplifies your operations with advanced features that give
you far more control over your temperature measurements (see Figure 8.2). Each sensor is
individually selectable and programmable.
•
Backup and Fail-Over Protection
allows either of the sensors or inputs to be designated as
the primary measurement, with the secondary input acting as the backup sensor in case of
primary sensor failure.
•
Average and Differential Measurement
allows you to average the two input measurements
or select the differential (A-B or B-A) or absolute differential between the two inputs.
•
High-Select and Low-Select Feature
enables the transmitter to continuously monitor two
separate inputs and designate either the highest or lowest input to represent the analog
output.
•
Dynamic Variable Mapping
permits the user to assign either input or the calculated result of
inputs to any of the four HART variables (PV, SV, TV or QV) that can be read by any HART-
compatible host system.
SIS
Logic Solver
STZ
Sensor 1
(Primary)
Sensor Failover/
Backup Enabled
Sensor 2
(Secondary)
Reactor
