Masoneilan SVI3 Installation and Maintenance Manual
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© 2021 Baker Hughes Company. All rights reserved.
NOTE : For small actuators it may be necessary to:
• Use 1/8" tubing for Autotune to work properly.
• Install tamper-proof adjustable needle valve in supply line to SVI; adjust
valve closed enough so autotune runs. Then lock valve setting so it can't be
tampered or changed.
WARNING
There can be unexpected valve, actuator or positioner movement at
any time during installation or operation.
CAUTION
Do not connect a HART
®
modem and PC to a control circuit unless
the controller is HART compatible or has a HART
®
filter. Loss of
control or a process upset may occur if the controller output circuit is
not compatible with HART
®
signals.
Install in compliance with Hazardous Area rules in accordance with
local electrical codes and plant standards using trained specialists.
Do not connect a PC or HART
®
modem to an intrinsically safe circuit
except on the safe area side of the barrier
.
Do not operate a PC in a
hazardous area without ensuring compliance with local and plant
regulations.
CAUTION
A control circuit must be HART
®
compatible or have a HART
®
filter
installed. Contact the manufacturers of the controller or DCS. See
“Controller outputs are separated internally from ground by a current
sense resistor or a control transistor. Dual channel barriers apply
excessive loop resistance and cause compliance voltage problems.
An Intrinsically Safe galvanic isolator operates with all three types of
output channels, isolated, grounded or separated from ground, and
provides sufficient compliance voltage. The galvanic isolator must
be certified by the manufacturer to be HART
®
compliant if the
HART
®
connections are supported on the safe area side of the
isolator. Consult barrier and isolator manufacturer for devices rated
for use with the SVI3 I.S. entity parameters in Hazardous Area
Approvals.”
√ Comply with current national and local regulations for electrical
installation work.
√ Comply with national and local explosive atmosphere regulations.
√ Before carrying out any work on the device, power off the
instrument or make sure that the locale conditions for potentially
explosive atmosphere permit the safe opening of the cover
.
