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3.6.7 Process Sealing
The ST 800 SmartLine pressure transmitter is CSA-certified as a Dual Seal device in accordance with
ANSI/ISA–12.27.01–2003, "Requirements for Process Sealing Between Electrical Systems and
Flammable, or Combustible Process Fluids."
3.6.8 Explosion-Proof Conduit Seal
When installed as explosion proof in a Division 1 Hazardous Location, keep covers tight
while the transmitter is energized. Disconnect power to the transmitter in the non-hazardous
area prior to removing end caps for service.
When installed as non-incendive equipment in a Division 2 hazardous location, disconnect
power to the transmitter in the non-hazardous area, or determine that the location is non-
hazardous before disconnecting or connecting the transmitter wires.
Transmitters installed as explosion proof in Class I, Division 1, Group A Hazardous (classified) location
in accordance with ANSI/NFPA 70, the US National Electrical Code, with 1/2 inch conduit do not require
an explosion-proof seal for installation. If 3/4-inch conduit is used, a LISTED explosion proof seal to be
installed in the conduit, within 18 inches (457.2 mm) of the transmitter.
3.7 Startup
3.7.1 Overview
This section identifies typical start up tasks associated with several generic pressure measurement
applications. It also includes the procedure for running an optional analog output check.
3.7.2 Startup Tasks
After completing the installation and configuration tasks for a transmitter, you are ready to start up the
process loop. Startup usually includes:
•
Checking zero input
•
Reading inputs and outputs
•
Applying process pressure to the transmitter.
You can also run an optional output check to wring out an analog loop and check out individual Process
Variable (PV) outputs in Digitally Enhanced (DE) mode before startup.
The actual steps in a startup procedure vary based on the type of transmitter and the measurement
application. In general, the procedures in this section are based on using HVC to check the transmitter
input and output under static process conditions and make adjustments as required initiating full
operation with the running process. Note that like checks can be made using the optional three-button
assembly, if your transmitter is so equipped. Operation with the three-button assembly is discussed in
the "Operation" section of this manual.
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ST 800 Pressure Transmitter User's Manual
Revision 15
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