Logix™ 3800zb Digital Positioner FCD AIIOM001030_EN 02/23
flowserve.com 8
There are moving parts between the actuator and the valve.
To avoid injury FLOWSERVE provides pinch-point-protection
in the form of cover plates, especially with side-mounted
positioners. Special attention is required when removing these
plates for inspection, service or repair. Refit the cover plates
after completing work.
Logix 3800zb positioner repair is limited to the replacement of
sub-assemblies and circuit boards with FLOWSERVE-
manufactured replacements as outlined in this manual.
DANGER: Substitution with non-factory positioner
components may impair safety.
CAUTION: Before returning products to FLOWSERVE for
repair or service, provide a certificate to FLOWSERVE which
confirms that the product has been decontaminated and is
clean; FLOWSERVE will not accept deliveries if a certificate is
not provided (a form is available from FLOWSERVE).
Apart from the operating instructions and the necessary
accident prevention directives valid in the country of use,
follow all recognized regulations for safety and good
engineering practices.
2.8 Natural Gas Service
The use of natural gas as an actuation medium with a
FLOWSERVE Logix 3800zb positioner and solenoid valve is
acceptable.
CAUTION: The natural gas used must be sweet natural
gas. Use of sour natural gas may cause positioner to fail
prematurely.
DANGER: The solenoid-controlled valve, controlled by the
Logix 3800zb, is vented directly to atmosphere. The sweet
natural gas as the supply requires piping to route the
exhausted natural gas to a safe environment. Refer to section
5.5, Venting, for venting details.
With natural gas is used as an actuation
medium, appropriately rated gas tight electrical feedthroughs
are required at each positioner housing conduit connection
for Explosionproof and Flameproof installations. Refer to
sections 6.2.4 for additional details.
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