www.miinet.com
Moore Industries-International, Inc.
- 126 -
User’s Manual
238-760-00K
May 2019
Functional Safety Dual Input Smart HART® Temperature Transmitter
STZ
SECTION 8
Figure 8.3.
The STZ can be applied as the temperature sensor/transmitter in a typical SIS loop.
Figure 8.4.
STZ provides valuable HART diagnostic data which can be used by an asset management system isolated
from the Safety Instrumented Function.
Logic Solver
(Single Loop
or Safety PLC)
Sensor
Dual Sensor Input
(Backup/Failover
Protection)
Final Element
Using HART monitoring for Additional Diagnostic Data
The STZ is fully HART 7 compliant and provides a wealth of data for diagnostics and
maintenance. A safety isolator such as the SSX can be used to isolate your SIF (Safety
Instrumented Function) and pass HART data from the STZ to an asset management system.
Note:
The STZ provides 3 HART modes: Full Access, Read Only or Disable. This can only be
set using the DTM with MISP (Moore Industries Serial Protocol) RS-232 or USB programming
cable. In this application it is recommended to operate with HART in Read Only mode while the
STZ is performing its safety function. This will prevent unauthorized or unplanned configuration
changes during operation.
Temperature Transmitter
with Dual Sensor Input
+PS
-PS
1
2
3
4
ADDR
ADDR
ADDR
ADDR
STZ
24V
IN
Logic Solver
(e.g. Safety System
or PLC/DCS)
Safety Instrumented
Function
Non-Safety Function
24V
IN
BPCS or
Asset
Management
System