Process Sealing; Explosion-Proof Conduit Seal; Startup; Overview - Honeywell ST 700 User Manual

3.6.7 Process Sealing

The ST 700 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)
locations 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.

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 Honeywell MC Toolkit 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.
Revision 2.0 ST 700 Smart Pressure Transmitter User's Manual Page 19